drivers/staging/rtl8192e/rtllib_rx.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Original code based Host AP (software wireless LAN access point) driver
   4  * for Intersil Prism2/2.5/3 - hostap.o module, common routines
   5  *
   6  * Copyright (c) 2001-2002, SSH Communications Security Corp and Jouni Malinen
   7  * <jkmaline@cc.hut.fi>
   8  * Copyright (c) 2002-2003, Jouni Malinen <jkmaline@cc.hut.fi>
   9  * Copyright (c) 2004, Intel Corporation
  10  *
  11  * Few modifications for Realtek's Wi-Fi drivers by
  12  * Andrea Merello <andrea.merello@gmail.com>
  13  *
  14  * A special thanks goes to Realtek for their support !
  15  */
  16 #include <linux/compiler.h>
  17 #include <linux/errno.h>
  18 #include <linux/if_arp.h>
  19 #include <linux/in6.h>
  20 #include <linux/in.h>
  21 #include <linux/ip.h>
  22 #include <linux/kernel.h>
  23 #include <linux/module.h>
  24 #include <linux/netdevice.h>
  25 #include <linux/pci.h>
  26 #include <linux/proc_fs.h>
  27 #include <linux/skbuff.h>
  28 #include <linux/slab.h>
  29 #include <linux/tcp.h>
  30 #include <linux/types.h>
  31 #include <linux/wireless.h>
  32 #include <linux/etherdevice.h>
  33 #include <linux/uaccess.h>
  34 #include <linux/ctype.h>
  35
  36 #include "rtllib.h"
  37 #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
 158 /* Called only as a tasklet (software IRQ) */
 159 static int rtllib_frag_cache_invalidate(struct rtllib_device *ieee,
 160                                            struct rtllib_hdr_4addr *hdr)
 161 {
 162         u16 fc = le16_to_cpu(hdr->frame_ctl);
 163         u16 sc = le16_to_cpu(hdr->seq_ctl);
 164         unsigned int seq = WLAN_GET_SEQ_SEQ(sc);
 165         struct rtllib_frag_entry *entry;
 166         struct rtllib_hdr_3addrqos *hdr_3addrqos;
 167         struct rtllib_hdr_4addrqos *hdr_4addrqos;
 168         u8 tid;
 169
 170         if (((fc & RTLLIB_FCTL_DSTODS) == RTLLIB_FCTL_DSTODS) &&
 171             RTLLIB_QOS_HAS_SEQ(fc)) {
 172                 hdr_4addrqos = (struct rtllib_hdr_4addrqos *)hdr;
 173                 tid = le16_to_cpu(hdr_4addrqos->qos_ctl) & RTLLIB_QCTL_TID;
 174                 tid = UP2AC(tid);
 175                 tid++;
 176         } else if (RTLLIB_QOS_HAS_SEQ(fc)) {
 177                 hdr_3addrqos = (struct rtllib_hdr_3addrqos *)hdr;
 178                 tid = le16_to_cpu(hdr_3addrqos->qos_ctl) & RTLLIB_QCTL_TID;
 179                 tid = UP2AC(tid);
 180                 tid++;
 181         } else {
 182                 tid = 0;
 183         }
 184
 185         entry = rtllib_frag_cache_find(ieee, seq, -1, tid, hdr->addr2,
 186                                           hdr->addr1);
 187
 188         if (entry == NULL) {
 189                 netdev_dbg(ieee->dev,
 190                            "Couldn't invalidate fragment cache entry (seq=%u)\n",
 191                            seq);
 192                 return -1;
 193         }
 194
 195         entry->skb = NULL;
 196         return 0;
 197 }
 198
 199 /* rtllib_rx_frame_mgtmt
 200  *
 201  * Responsible for handling management control frames
 202  *
 203  * Called by rtllib_rx
 204  */
 205 static inline int
 206 rtllib_rx_frame_mgmt(struct rtllib_device *ieee, struct sk_buff *skb,
 207                         struct rtllib_rx_stats *rx_stats, u16 type,
 208                         u16 stype)
 209 {
 210         /* On the struct stats definition there is written that
 211          * this is not mandatory.... but seems that the probe
 212          * response parser uses it
 213          */
 214         struct rtllib_hdr_3addr *hdr = (struct rtllib_hdr_3addr *)skb->data;
 215
 216         rx_stats->len = skb->len;
 217         rtllib_rx_mgt(ieee, skb, rx_stats);
 218         if ((memcmp(hdr->addr1, ieee->dev->dev_addr, ETH_ALEN))) {
 219                 dev_kfree_skb_any(skb);
 220                 return 0;
 221         }
 222         rtllib_rx_frame_softmac(ieee, skb, rx_stats, type, stype);
 223
 224         dev_kfree_skb_any(skb);
 225
 226         return 0;
 227 }
 228
 229 /* See IEEE 802.1H for LLC/SNAP encapsulation/decapsulation
 230  * Ethernet-II snap header (RFC1042 for most EtherTypes)
 231  */
 232 static unsigned char rfc1042_header[] = {
 233         0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00
 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 /* No encapsulation header if EtherType < 0x600 (=length) */
 240
 241 /* Called by rtllib_rx_frame_decrypt */
 242 static int rtllib_is_eapol_frame(struct rtllib_device *ieee,
 243                                     struct sk_buff *skb, size_t hdrlen)
 244 {
 245         struct net_device *dev = ieee->dev;
 246         u16 fc, ethertype;
 247         struct rtllib_hdr_4addr *hdr;
 248         u8 *pos;
 249
 250         if (skb->len < 24)
 251                 return 0;
 252
 253         hdr = (struct rtllib_hdr_4addr *) skb->data;
 254         fc = le16_to_cpu(hdr->frame_ctl);
 255
 256         /* check that the frame is unicast frame to us */
 257         if ((fc & (RTLLIB_FCTL_TODS | RTLLIB_FCTL_FROMDS)) ==
 258             RTLLIB_FCTL_TODS &&
 259             memcmp(hdr->addr1, dev->dev_addr, ETH_ALEN) == 0 &&
 260             memcmp(hdr->addr3, dev->dev_addr, ETH_ALEN) == 0) {
 261                 /* ToDS frame with own addr BSSID and DA */
 262         } else if ((fc & (RTLLIB_FCTL_TODS | RTLLIB_FCTL_FROMDS)) ==
 263                    RTLLIB_FCTL_FROMDS &&
 264                    memcmp(hdr->addr1, dev->dev_addr, ETH_ALEN) == 0) {
 265                 /* FromDS frame with own addr as DA */
 266         } else
 267                 return 0;
 268
 269         if (skb->len < 24 + 8)
 270                 return 0;
 271
 272         /* check for port access entity Ethernet type */
 273         pos = skb->data + hdrlen;
 274         ethertype = (pos[6] << 8) | pos[7];
 275         if (ethertype == ETH_P_PAE)
 276                 return 1;
 277
 278         return 0;
 279 }
 280
 281 /* Called only as a tasklet (software IRQ), by rtllib_rx */
 282 static inline int
 283 rtllib_rx_frame_decrypt(struct rtllib_device *ieee, struct sk_buff *skb,
 284                         struct lib80211_crypt_data *crypt)
 285 {
 286         struct rtllib_hdr_4addr *hdr;
 287         int res, hdrlen;
 288
 289         if (crypt == NULL || crypt->ops->decrypt_mpdu == NULL)
 290                 return 0;
 291
 292         if (ieee->hwsec_active) {
 293                 struct cb_desc *tcb_desc = (struct cb_desc *)
 294                                                 (skb->cb + MAX_DEV_ADDR_SIZE);
 295
 296                 tcb_desc->bHwSec = 1;
 297
 298                 if (ieee->need_sw_enc)
 299                         tcb_desc->bHwSec = 0;
 300         }
 301
 302         hdr = (struct rtllib_hdr_4addr *) skb->data;
 303         hdrlen = rtllib_get_hdrlen(le16_to_cpu(hdr->frame_ctl));
 304
 305         atomic_inc(&crypt->refcnt);
 306         res = crypt->ops->decrypt_mpdu(skb, hdrlen, crypt->priv);
 307         atomic_dec(&crypt->refcnt);
 308         if (res < 0) {
 309                 netdev_dbg(ieee->dev, "decryption failed (SA= %pM) res=%d\n",
 310                            hdr->addr2, res);
 311                 if (res == -2)
 312                         netdev_dbg(ieee->dev,
 313                                    "Decryption failed ICV mismatch (key %d)\n",
 314                                    skb->data[hdrlen + 3] >> 6);
 315                 return -1;
 316         }
 317
 318         return res;
 319 }
 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
 359 /* this function is stolen from ipw2200 driver*/
 360 #define IEEE_PACKET_RETRY_TIME (5*HZ)
 361 static int is_duplicate_packet(struct rtllib_device *ieee,
 362                                       struct rtllib_hdr_4addr *header)
 363 {
 364         u16 fc = le16_to_cpu(header->frame_ctl);
 365         u16 sc = le16_to_cpu(header->seq_ctl);
 366         u16 seq = WLAN_GET_SEQ_SEQ(sc);
 367         u16 frag = WLAN_GET_SEQ_FRAG(sc);
 368         u16 *last_seq, *last_frag;
 369         unsigned long *last_time;
 370         struct rtllib_hdr_3addrqos *hdr_3addrqos;
 371         struct rtllib_hdr_4addrqos *hdr_4addrqos;
 372         u8 tid;
 373
 374         if (((fc & RTLLIB_FCTL_DSTODS) == RTLLIB_FCTL_DSTODS) &&
 375             RTLLIB_QOS_HAS_SEQ(fc)) {
 376                 hdr_4addrqos = (struct rtllib_hdr_4addrqos *)header;
 377                 tid = le16_to_cpu(hdr_4addrqos->qos_ctl) & RTLLIB_QCTL_TID;
 378                 tid = UP2AC(tid);
 379                 tid++;
 380         } else if (RTLLIB_QOS_HAS_SEQ(fc)) {
 381                 hdr_3addrqos = (struct rtllib_hdr_3addrqos *)header;
 382                 tid = le16_to_cpu(hdr_3addrqos->qos_ctl) & RTLLIB_QCTL_TID;
 383                 tid = UP2AC(tid);
 384                 tid++;
 385         } else {
 386                 tid = 0;
 387         }
 388
 389         switch (ieee->iw_mode) {
 390         case IW_MODE_ADHOC:
 391         {
 392                 struct list_head *p;
 393                 struct ieee_ibss_seq *entry = NULL;
 394                 u8 *mac = header->addr2;
 395                 int index = mac[5] % IEEE_IBSS_MAC_HASH_SIZE;
 396
 397                 list_for_each(p, &ieee->ibss_mac_hash[index]) {
 398                         entry = list_entry(p, struct ieee_ibss_seq, list);
 399                         if (!memcmp(entry->mac, mac, ETH_ALEN))
 400                                 break;
 401                 }
 402                 if (p == &ieee->ibss_mac_hash[index]) {
 403                         entry = kmalloc(sizeof(struct ieee_ibss_seq),
 404                                         GFP_ATOMIC);
 405                         if (!entry)
 406                                 return 0;
 407
 408                         ether_addr_copy(entry->mac, mac);
 409                         entry->seq_num[tid] = seq;
 410                         entry->frag_num[tid] = frag;
 411                         entry->packet_time[tid] = jiffies;
 412                         list_add(&entry->list, &ieee->ibss_mac_hash[index]);
 413                         return 0;
 414                 }
 415                 last_seq = &entry->seq_num[tid];
 416                 last_frag = &entry->frag_num[tid];
 417                 last_time = &entry->packet_time[tid];
 418                 break;
 419         }
 420
 421         case IW_MODE_INFRA:
 422                 last_seq = &ieee->last_rxseq_num[tid];
 423                 last_frag = &ieee->last_rxfrag_num[tid];
 424                 last_time = &ieee->last_packet_time[tid];
 425                 break;
 426         default:
 427                 return 0;
 428         }
 429
 430         if ((*last_seq == seq) &&
 431             time_after(*last_time + IEEE_PACKET_RETRY_TIME, jiffies)) {
 432                 if (*last_frag == frag)
 433                         goto drop;
 434                 if (*last_frag + 1 != frag)
 435                         /* out-of-order fragment */
 436                         goto drop;
 437         } else
 438                 *last_seq = seq;
 439
 440         *last_frag = frag;
 441         *last_time = jiffies;
 442         return 0;
 443
 444 drop:
 445
 446         return 1;
 447 }
 448
 449 static bool AddReorderEntry(struct rx_ts_record *pTS,
 450                             struct rx_reorder_entry *pReorderEntry)
 451 {
 452         struct list_head *pList = &pTS->rx_pending_pkt_list;
 453
 454         while (pList->next != &pTS->rx_pending_pkt_list) {
 455                 if (SN_LESS(pReorderEntry->SeqNum, ((struct rx_reorder_entry *)
 456                     list_entry(pList->next, struct rx_reorder_entry,
 457                     List))->SeqNum))
 458                         pList = pList->next;
 459                 else if (SN_EQUAL(pReorderEntry->SeqNum,
 460                         ((struct rx_reorder_entry *)list_entry(pList->next,
 461                         struct rx_reorder_entry, List))->SeqNum))
 462                         return false;
 463                 else
 464                         break;
 465         }
 466         pReorderEntry->List.next = pList->next;
 467         pReorderEntry->List.next->prev = &pReorderEntry->List;
 468         pReorderEntry->List.prev = pList;
 469         pList->next = &pReorderEntry->List;
 470
 471         return true;
 472 }
 473
 474 void rtllib_indicate_packets(struct rtllib_device *ieee,
 475                              struct rtllib_rxb **prxbIndicateArray, u8 index)
 476 {
 477         struct net_device_stats *stats = &ieee->stats;
 478         u8 i = 0, j = 0;
 479         u16 ethertype;
 480
 481         for (j = 0; j < index; j++) {
 482                 struct rtllib_rxb *prxb = prxbIndicateArray[j];
 483
 484                 for (i = 0; i < prxb->nr_subframes; i++) {
 485                         struct sk_buff *sub_skb = prxb->subframes[i];
 486
 487                 /* convert hdr + possible LLC headers into Ethernet header */
 488                         ethertype = (sub_skb->data[6] << 8) | sub_skb->data[7];
 489                         if (sub_skb->len >= 8 &&
 490                             ((memcmp(sub_skb->data, rfc1042_header,
 491                                      SNAP_SIZE) == 0 &&
 492                               ethertype != ETH_P_AARP &&
 493                               ethertype != ETH_P_IPX) ||
 494                             memcmp(sub_skb->data, bridge_tunnel_header,
 495                                    SNAP_SIZE) == 0)) {
 496                                 /* remove RFC1042 or Bridge-Tunnel encapsulation
 497                                  * and replace EtherType
 498                                  */
 499                                 skb_pull(sub_skb, SNAP_SIZE);
 500                                 memcpy(skb_push(sub_skb, ETH_ALEN), prxb->src, ETH_ALEN);
 501                                 memcpy(skb_push(sub_skb, ETH_ALEN), prxb->dst, ETH_ALEN);
 502                         } else {
 503                                 u16 len;
 504                         /* Leave Ethernet header part of hdr and full payload */
 505                                 len = sub_skb->len;
 506                                 memcpy(skb_push(sub_skb, 2), &len, 2);
 507                                 memcpy(skb_push(sub_skb, ETH_ALEN), prxb->src, ETH_ALEN);
 508                                 memcpy(skb_push(sub_skb, ETH_ALEN), prxb->dst, ETH_ALEN);
 509                         }
 510
 511                         /* Indicate the packets to upper layer */
 512                         if (sub_skb) {
 513                                 stats->rx_packets++;
 514                                 stats->rx_bytes += sub_skb->len;
 515
 516                                 memset(sub_skb->cb, 0, sizeof(sub_skb->cb));
 517                                 sub_skb->protocol = eth_type_trans(sub_skb,
 518                                                                    ieee->dev);
 519                                 sub_skb->dev = ieee->dev;
 520                                 sub_skb->dev->stats.rx_packets++;
 521                                 sub_skb->dev->stats.rx_bytes += sub_skb->len;
 522                                 /* 802.11 crc not sufficient */
 523                                 sub_skb->ip_summed = CHECKSUM_NONE;
 524                                 ieee->last_rx_ps_time = jiffies;
 525                                 netif_rx(sub_skb);
 526                         }
 527                 }
 528                 kfree(prxb);
 529                 prxb = NULL;
 530         }
 531 }
 532
 533 void rtllib_FlushRxTsPendingPkts(struct rtllib_device *ieee,
 534                                  struct rx_ts_record *pTS)
 535 {
 536         struct rx_reorder_entry *pRxReorderEntry;
 537         u8 RfdCnt = 0;
 538
 539         del_timer_sync(&pTS->rx_pkt_pending_timer);
 540         while (!list_empty(&pTS->rx_pending_pkt_list)) {
 541                 if (RfdCnt >= REORDER_WIN_SIZE) {
 542                         netdev_info(ieee->dev,
 543                                     "-------------->%s() error! RfdCnt >= REORDER_WIN_SIZE\n",
 544                                     __func__);
 545                         break;
 546                 }
 547
 548                 pRxReorderEntry = (struct rx_reorder_entry *)
 549                                   list_entry(pTS->rx_pending_pkt_list.prev,
 550                                              struct rx_reorder_entry, List);
 551                 netdev_dbg(ieee->dev, "%s(): Indicate SeqNum %d!\n", __func__,
 552                            pRxReorderEntry->SeqNum);
 553                 list_del_init(&pRxReorderEntry->List);
 554
 555                 ieee->RfdArray[RfdCnt] = pRxReorderEntry->prxb;
 556
 557                 RfdCnt = RfdCnt + 1;
 558                 list_add_tail(&pRxReorderEntry->List,
 559                               &ieee->RxReorder_Unused_List);
 560         }
 561         rtllib_indicate_packets(ieee, ieee->RfdArray, RfdCnt);
 562
 563         pTS->rx_indicate_seq = 0xffff;
 564 }
 565
 566 static void RxReorderIndicatePacket(struct rtllib_device *ieee,
 567                                     struct rtllib_rxb *prxb,
 568                                     struct rx_ts_record *pTS, u16 SeqNum)
 569 {
 570         struct rt_hi_throughput *pHTInfo = ieee->pHTInfo;
 571         struct rx_reorder_entry *pReorderEntry = NULL;
 572         u8 WinSize = pHTInfo->RxReorderWinSize;
 573         u16 WinEnd = 0;
 574         u8 index = 0;
 575         bool bMatchWinStart = false, bPktInBuf = false;
 576         unsigned long flags;
 577
 578         netdev_dbg(ieee->dev,
 579                    "%s(): Seq is %d, pTS->rx_indicate_seq is %d, WinSize is %d\n",
 580                    __func__, SeqNum, pTS->rx_indicate_seq, WinSize);
 581
 582         spin_lock_irqsave(&(ieee->reorder_spinlock), flags);
 583
 584         WinEnd = (pTS->rx_indicate_seq + WinSize - 1) % 4096;
 585         /* Rx Reorder initialize condition.*/
 586         if (pTS->rx_indicate_seq == 0xffff)
 587                 pTS->rx_indicate_seq = SeqNum;
 588
 589         /* Drop out the packet which SeqNum is smaller than WinStart */
 590         if (SN_LESS(SeqNum, pTS->rx_indicate_seq)) {
 591                 netdev_dbg(ieee->dev,
 592                            "Packet Drop! IndicateSeq: %d, NewSeq: %d\n",
 593                            pTS->rx_indicate_seq, SeqNum);
 594                 pHTInfo->RxReorderDropCounter++;
 595                 {
 596                         int i;
 597
 598                         for (i = 0; i < prxb->nr_subframes; i++)
 599                                 dev_kfree_skb(prxb->subframes[i]);
 600                         kfree(prxb);
 601                         prxb = NULL;
 602                 }
 603                 spin_unlock_irqrestore(&(ieee->reorder_spinlock), flags);
 604                 return;
 605         }
 606
 607         /* Sliding window manipulation. Conditions includes:
 608          * 1. Incoming SeqNum is equal to WinStart =>Window shift 1
 609          * 2. Incoming SeqNum is larger than the WinEnd => Window shift N
 610          */
 611         if (SN_EQUAL(SeqNum, pTS->rx_indicate_seq)) {
 612                 pTS->rx_indicate_seq = (pTS->rx_indicate_seq + 1) % 4096;
 613                 bMatchWinStart = true;
 614         } else if (SN_LESS(WinEnd, SeqNum)) {
 615                 if (SeqNum >= (WinSize - 1))
 616                         pTS->rx_indicate_seq = SeqNum + 1 - WinSize;
 617                 else
 618                         pTS->rx_indicate_seq = 4095 -
 619                                              (WinSize - (SeqNum + 1)) + 1;
 620                 netdev_dbg(ieee->dev,
 621                            "Window Shift! IndicateSeq: %d, NewSeq: %d\n",
 622                            pTS->rx_indicate_seq, SeqNum);
 623         }
 624
 625         /* Indication process.
 626          * After Packet dropping and Sliding Window shifting as above, we can
 627          * now just indicate the packets with the SeqNum smaller than latest
 628          * WinStart and struct buffer other packets.
 629          *
 630          * For Rx Reorder condition:
 631          * 1. All packets with SeqNum smaller than WinStart => Indicate
 632          * 2. All packets with SeqNum larger than or equal to
 633          *       WinStart => Buffer it.
 634          */
 635         if (bMatchWinStart) {
 636                 /* Current packet is going to be indicated.*/
 637                 netdev_dbg(ieee->dev,
 638                            "Packets indication! IndicateSeq: %d, NewSeq: %d\n",
 639                            pTS->rx_indicate_seq, SeqNum);
 640                 ieee->prxbIndicateArray[0] = prxb;
 641                 index = 1;
 642         } else {
 643                 /* Current packet is going to be inserted into pending list.*/
 644                 if (!list_empty(&ieee->RxReorder_Unused_List)) {
 645                         pReorderEntry = (struct rx_reorder_entry *)
 646                                         list_entry(ieee->RxReorder_Unused_List.next,
 647                                         struct rx_reorder_entry, List);
 648                         list_del_init(&pReorderEntry->List);
 649
 650                         /* Make a reorder entry and insert
 651                          * into a the packet list.
 652                          */
 653                         pReorderEntry->SeqNum = SeqNum;
 654                         pReorderEntry->prxb = prxb;
 655
 656                         if (!AddReorderEntry(pTS, pReorderEntry)) {
 657                                 int i;
 658
 659                                 netdev_dbg(ieee->dev,
 660                                            "%s(): Duplicate packet is dropped. IndicateSeq: %d, NewSeq: %d\n",
 661                                            __func__, pTS->rx_indicate_seq,
 662                                            SeqNum);
 663                                 list_add_tail(&pReorderEntry->List,
 664                                               &ieee->RxReorder_Unused_List);
 665
 666                                 for (i = 0; i < prxb->nr_subframes; i++)
 667                                         dev_kfree_skb(prxb->subframes[i]);
 668                                 kfree(prxb);
 669                                 prxb = NULL;
 670                         } else {
 671                                 netdev_dbg(ieee->dev,
 672                                            "Pkt insert into struct buffer. IndicateSeq: %d, NewSeq: %d\n",
 673                                            pTS->rx_indicate_seq, SeqNum);
 674                         }
 675                 } else {
 676                         /* Packets are dropped if there are not enough reorder
 677                          * entries. This part should be modified!! We can just
 678                          * indicate all the packets in struct buffer and get
 679                          * reorder entries.
 680                          */
 681                         netdev_err(ieee->dev,
 682                                    "%s(): There is no reorder entry! Packet is dropped!\n",
 683                                    __func__);
 684                         {
 685                                 int i;
 686
 687                                 for (i = 0; i < prxb->nr_subframes; i++)
 688                                         dev_kfree_skb(prxb->subframes[i]);
 689                                 kfree(prxb);
 690                                 prxb = NULL;
 691                         }
 692                 }
 693         }
 694
 695         /* Check if there is any packet need indicate.*/
 696         while (!list_empty(&pTS->rx_pending_pkt_list)) {
 697                 netdev_dbg(ieee->dev, "%s(): start RREORDER indicate\n",
 698                            __func__);
 699
 700                 pReorderEntry = (struct rx_reorder_entry *)
 701                                         list_entry(pTS->rx_pending_pkt_list.prev,
 702                                                    struct rx_reorder_entry,
 703                                                    List);
 704                 if (SN_LESS(pReorderEntry->SeqNum, pTS->rx_indicate_seq) ||
 705                     SN_EQUAL(pReorderEntry->SeqNum, pTS->rx_indicate_seq)) {
 706                         /* This protect struct buffer from overflow. */
 707                         if (index >= REORDER_WIN_SIZE) {
 708                                 netdev_err(ieee->dev,
 709                                            "%s(): Buffer overflow!\n",
 710                                            __func__);
 711                                 bPktInBuf = true;
 712                                 break;
 713                         }
 714
 715                         list_del_init(&pReorderEntry->List);
 716
 717                         if (SN_EQUAL(pReorderEntry->SeqNum, pTS->rx_indicate_seq))
 718                                 pTS->rx_indicate_seq = (pTS->rx_indicate_seq + 1) %
 719                                                      4096;
 720
 721                         ieee->prxbIndicateArray[index] = pReorderEntry->prxb;
 722                         netdev_dbg(ieee->dev, "%s(): Indicate SeqNum %d!\n",
 723                                    __func__, pReorderEntry->SeqNum);
 724                         index++;
 725
 726                         list_add_tail(&pReorderEntry->List,
 727                                       &ieee->RxReorder_Unused_List);
 728                 } else {
 729                         bPktInBuf = true;
 730                         break;
 731                 }
 732         }
 733
 734         /* Handling pending timer. Set this timer to prevent from long time
 735          * Rx buffering.
 736          */
 737         if (index > 0) {
 738                 if (timer_pending(&pTS->rx_pkt_pending_timer))
 739                         del_timer_sync(&pTS->rx_pkt_pending_timer);
 740                 pTS->rx_timeout_indicate_seq = 0xffff;
 741
 742                 if (index > REORDER_WIN_SIZE) {
 743                         netdev_err(ieee->dev,
 744                                    "%s(): Rx Reorder struct buffer full!\n",
 745                                    __func__);
 746                         spin_unlock_irqrestore(&(ieee->reorder_spinlock),
 747                                                flags);
 748                         return;
 749                 }
 750                 rtllib_indicate_packets(ieee, ieee->prxbIndicateArray, index);
 751                 bPktInBuf = false;
 752         }
 753
 754         if (bPktInBuf && pTS->rx_timeout_indicate_seq == 0xffff) {
 755                 netdev_dbg(ieee->dev, "%s(): SET rx timeout timer\n", __func__);
 756                 pTS->rx_timeout_indicate_seq = pTS->rx_indicate_seq;
 757                 mod_timer(&pTS->rx_pkt_pending_timer, jiffies +
 758                           msecs_to_jiffies(pHTInfo->RxReorderPendingTime));
 759         }
 760         spin_unlock_irqrestore(&(ieee->reorder_spinlock), flags);
 761 }
 762
 763 static u8 parse_subframe(struct rtllib_device *ieee, struct sk_buff *skb,
 764                          struct rtllib_rx_stats *rx_stats,
 765                          struct rtllib_rxb *rxb, u8 *src, u8 *dst)
 766 {
 767         struct rtllib_hdr_3addr  *hdr = (struct rtllib_hdr_3addr *)skb->data;
 768         u16             fc = le16_to_cpu(hdr->frame_ctl);
 769
 770         u16             LLCOffset = sizeof(struct rtllib_hdr_3addr);
 771         u16             ChkLength;
 772         bool            bIsAggregateFrame = false;
 773         u16             nSubframe_Length;
 774         u8              nPadding_Length = 0;
 775         u16             SeqNum = 0;
 776         struct sk_buff *sub_skb;
 777         /* just for debug purpose */
 778         SeqNum = WLAN_GET_SEQ_SEQ(le16_to_cpu(hdr->seq_ctl));
 779         if ((RTLLIB_QOS_HAS_SEQ(fc)) &&
 780            (((union frameqos *)(skb->data + RTLLIB_3ADDR_LEN))->field.reserved))
 781                 bIsAggregateFrame = true;
 782
 783         if (RTLLIB_QOS_HAS_SEQ(fc))
 784                 LLCOffset += 2;
 785         if (rx_stats->bContainHTC)
 786                 LLCOffset += sHTCLng;
 787
 788         ChkLength = LLCOffset;
 789
 790         if (skb->len <= ChkLength)
 791                 return 0;
 792
 793         skb_pull(skb, LLCOffset);
 794         ieee->bIsAggregateFrame = bIsAggregateFrame;
 795         if (!bIsAggregateFrame) {
 796                 rxb->nr_subframes = 1;
 797
 798                 /* altered by clark 3/30/2010
 799                  * The struct buffer size of the skb indicated to upper layer
 800                  * must be less than 5000, or the defraged IP datagram
 801                  * in the IP layer will exceed "ipfrag_high_tresh" and be
 802                  * discarded. so there must not use the function
 803                  * "skb_copy" and "skb_clone" for "skb".
 804                  */
 805
 806                 /* Allocate new skb for releasing to upper layer */
 807                 sub_skb = dev_alloc_skb(RTLLIB_SKBBUFFER_SIZE);
 808                 if (!sub_skb)
 809                         return 0;
 810                 skb_reserve(sub_skb, 12);
 811                 skb_put_data(sub_skb, skb->data, skb->len);
 812                 sub_skb->dev = ieee->dev;
 813
 814                 rxb->subframes[0] = sub_skb;
 815
 816                 memcpy(rxb->src, src, ETH_ALEN);
 817                 memcpy(rxb->dst, dst, ETH_ALEN);
 818                 rxb->subframes[0]->dev = ieee->dev;
 819                 return 1;
 820         }
 821
 822         rxb->nr_subframes = 0;
 823         memcpy(rxb->src, src, ETH_ALEN);
 824         memcpy(rxb->dst, dst, ETH_ALEN);
 825         while (skb->len > ETHERNET_HEADER_SIZE) {
 826                 /* Offset 12 denote 2 mac address */
 827                 nSubframe_Length = *((u16 *)(skb->data + 12));
 828                 nSubframe_Length = (nSubframe_Length >> 8) +
 829                                    (nSubframe_Length << 8);
 830
 831                 if (skb->len < (ETHERNET_HEADER_SIZE + nSubframe_Length)) {
 832                         netdev_info(ieee->dev,
 833                                     "%s: A-MSDU parse error!! pRfd->nTotalSubframe : %d\n",
 834                                     __func__, rxb->nr_subframes);
 835                         netdev_info(ieee->dev,
 836                                     "%s: A-MSDU parse error!! Subframe Length: %d\n",
 837                                     __func__, nSubframe_Length);
 838                         netdev_info(ieee->dev,
 839                                     "nRemain_Length is %d and nSubframe_Length is : %d\n",
 840                                     skb->len, nSubframe_Length);
 841                         netdev_info(ieee->dev,
 842                                     "The Packet SeqNum is %d\n",
 843                                     SeqNum);
 844                         return 0;
 845                 }
 846
 847                 /* move the data point to data content */
 848                 skb_pull(skb, ETHERNET_HEADER_SIZE);
 849
 850                 /* altered by clark 3/30/2010
 851                  * The struct buffer size of the skb indicated to upper layer
 852                  * must be less than 5000, or the defraged IP datagram
 853                  * in the IP layer will exceed "ipfrag_high_tresh" and be
 854                  * discarded. so there must not use the function
 855                  * "skb_copy" and "skb_clone" for "skb".
 856                  */
 857
 858                 /* Allocate new skb for releasing to upper layer */
 859                 sub_skb = dev_alloc_skb(nSubframe_Length + 12);
 860                 if (!sub_skb)
 861                         return 0;
 862                 skb_reserve(sub_skb, 12);
 863                 skb_put_data(sub_skb, skb->data, nSubframe_Length);
 864
 865                 sub_skb->dev = ieee->dev;
 866                 rxb->subframes[rxb->nr_subframes++] = sub_skb;
 867                 if (rxb->nr_subframes >= MAX_SUBFRAME_COUNT) {
 868                         netdev_dbg(ieee->dev,
 869                                    "ParseSubframe(): Too many Subframes! Packets dropped!\n");
 870                         break;
 871                 }
 872                 skb_pull(skb, nSubframe_Length);
 873
 874                 if (skb->len != 0) {
 875                         nPadding_Length = 4 - ((nSubframe_Length +
 876                                           ETHERNET_HEADER_SIZE) % 4);
 877                         if (nPadding_Length == 4)
 878                                 nPadding_Length = 0;
 879
 880                         if (skb->len < nPadding_Length)
 881                                 return 0;
 882
 883                         skb_pull(skb, nPadding_Length);
 884                 }
 885         }
 886
 887         return rxb->nr_subframes;
 888 }
 889
 890
 891 static size_t rtllib_rx_get_hdrlen(struct rtllib_device *ieee,
 892                                    struct sk_buff *skb,
 893                                    struct rtllib_rx_stats *rx_stats)
 894 {
 895         struct rtllib_hdr_4addr *hdr = (struct rtllib_hdr_4addr *)skb->data;
 896         u16 fc = le16_to_cpu(hdr->frame_ctl);
 897         size_t hdrlen;
 898
 899         hdrlen = rtllib_get_hdrlen(fc);
 900         if (HTCCheck(ieee, skb->data)) {
 901                 if (net_ratelimit())
 902                         netdev_info(ieee->dev, "%s: find HTCControl!\n",
 903                                     __func__);
 904                 hdrlen += 4;
 905                 rx_stats->bContainHTC = true;
 906         }
 907
 908         if (RTLLIB_QOS_HAS_SEQ(fc))
 909                 rx_stats->bIsQosData = true;
 910
 911         return hdrlen;
 912 }
 913
 914 static int rtllib_rx_check_duplicate(struct rtllib_device *ieee,
 915                                      struct sk_buff *skb, u8 multicast)
 916 {
 917         struct rtllib_hdr_4addr *hdr = (struct rtllib_hdr_4addr *)skb->data;
 918         u16 fc, sc;
 919         u8 frag, type, stype;
 920
 921         fc = le16_to_cpu(hdr->frame_ctl);
 922         type = WLAN_FC_GET_TYPE(fc);
 923         stype = WLAN_FC_GET_STYPE(fc);
 924         sc = le16_to_cpu(hdr->seq_ctl);
 925         frag = WLAN_GET_SEQ_FRAG(sc);
 926
 927         if (!ieee->pHTInfo->bCurRxReorderEnable ||
 928                 !ieee->current_network.qos_data.active ||
 929                 !IsDataFrame(skb->data) ||
 930                 IsLegacyDataFrame(skb->data)) {
 931                 if (!((type == RTLLIB_FTYPE_MGMT) &&
 932                       (stype == RTLLIB_STYPE_BEACON))) {
 933                         if (is_duplicate_packet(ieee, hdr))
 934                                 return -1;
 935                 }
 936         } else {
 937                 struct rx_ts_record *pRxTS = NULL;
 938
 939                 if (GetTs(ieee, (struct ts_common_info **) &pRxTS, hdr->addr2,
 940                         (u8)Frame_QoSTID((u8 *)(skb->data)), RX_DIR, true)) {
 941                         if ((fc & (1<<11)) && (frag == pRxTS->rx_last_frag_num) &&
 942                             (WLAN_GET_SEQ_SEQ(sc) == pRxTS->rx_last_seq_num))
 943                                 return -1;
 944                         pRxTS->rx_last_frag_num = frag;
 945                         pRxTS->rx_last_seq_num = WLAN_GET_SEQ_SEQ(sc);
 946                 } else {
 947                         netdev_warn(ieee->dev, "%s(): No TS! Skip the check!\n",
 948                                     __func__);
 949                         return -1;
 950                 }
 951         }
 952
 953         return 0;
 954 }
 955
 956 static void rtllib_rx_extract_addr(struct rtllib_device *ieee,
 957                                    struct rtllib_hdr_4addr *hdr, u8 *dst,
 958                                    u8 *src, u8 *bssid)
 959 {
 960         u16 fc = le16_to_cpu(hdr->frame_ctl);
 961
 962         switch (fc & (RTLLIB_FCTL_FROMDS | RTLLIB_FCTL_TODS)) {
 963         case RTLLIB_FCTL_FROMDS:
 964                 ether_addr_copy(dst, hdr->addr1);
 965                 ether_addr_copy(src, hdr->addr3);
 966                 ether_addr_copy(bssid, hdr->addr2);
 967                 break;
 968         case RTLLIB_FCTL_TODS:
 969                 ether_addr_copy(dst, hdr->addr3);
 970                 ether_addr_copy(src, hdr->addr2);
 971                 ether_addr_copy(bssid, hdr->addr1);
 972                 break;
 973         case RTLLIB_FCTL_FROMDS | RTLLIB_FCTL_TODS:
 974                 ether_addr_copy(dst, hdr->addr3);
 975                 ether_addr_copy(src, hdr->addr4);
 976                 ether_addr_copy(bssid, ieee->current_network.bssid);
 977                 break;
 978         default:
 979                 ether_addr_copy(dst, hdr->addr1);
 980                 ether_addr_copy(src, hdr->addr2);
 981                 ether_addr_copy(bssid, hdr->addr3);
 982                 break;
 983         }
 984 }
 985
 986 static int rtllib_rx_data_filter(struct rtllib_device *ieee, u16 fc,
 987                                  u8 *dst, u8 *src, u8 *bssid, u8 *addr2)
 988 {
 989         u8 type, stype;
 990
 991         type = WLAN_FC_GET_TYPE(fc);
 992         stype = WLAN_FC_GET_STYPE(fc);
 993
 994         /* Filter frames from different BSS */
 995         if (((fc & RTLLIB_FCTL_DSTODS) != RTLLIB_FCTL_DSTODS) &&
 996             !ether_addr_equal(ieee->current_network.bssid, bssid) &&
 997             !is_zero_ether_addr(ieee->current_network.bssid)) {
 998                 return -1;
 999         }
1000
1001         /* Filter packets sent by an STA that will be forwarded by AP */
1002         if (ieee->IntelPromiscuousModeInfo.bPromiscuousOn  &&
1003                 ieee->IntelPromiscuousModeInfo.bFilterSourceStationFrame) {
1004                 if ((fc & RTLLIB_FCTL_TODS) && !(fc & RTLLIB_FCTL_FROMDS) &&
1005                     !ether_addr_equal(dst, ieee->current_network.bssid) &&
1006                     ether_addr_equal(bssid, ieee->current_network.bssid)) {
1007                         return -1;
1008                 }
1009         }
1010
1011         /* Nullfunc frames may have PS-bit set, so they must be passed to
1012          * hostap_handle_sta_rx() before being dropped here.
1013          */
1014         if (!ieee->IntelPromiscuousModeInfo.bPromiscuousOn) {
1015                 if (stype != RTLLIB_STYPE_DATA &&
1016                     stype != RTLLIB_STYPE_DATA_CFACK &&
1017                     stype != RTLLIB_STYPE_DATA_CFPOLL &&
1018                     stype != RTLLIB_STYPE_DATA_CFACKPOLL &&
1019                     stype != RTLLIB_STYPE_QOS_DATA) {
1020                         if (stype != RTLLIB_STYPE_NULLFUNC)
1021                                 netdev_dbg(ieee->dev,
1022                                            "RX: dropped data frame with no data (type=0x%02x, subtype=0x%02x)\n",
1023                                            type, stype);
1024                         return -1;
1025                 }
1026         }
1027
1028         if (ieee->iw_mode != IW_MODE_MESH) {
1029                 /* packets from our adapter are dropped (echo) */
1030                 if (!memcmp(src, ieee->dev->dev_addr, ETH_ALEN))
1031                         return -1;
1032
1033                 /* {broad,multi}cast packets to our BSS go through */
1034                 if (is_multicast_ether_addr(dst)) {
1035                         if (memcmp(bssid, ieee->current_network.bssid,
1036                                    ETH_ALEN))
1037                                 return -1;
1038                 }
1039         }
1040         return 0;
1041 }
1042
1043 static int rtllib_rx_get_crypt(struct rtllib_device *ieee, struct sk_buff *skb,
1044                         struct lib80211_crypt_data **crypt, size_t hdrlen)
1045 {
1046         struct rtllib_hdr_4addr *hdr = (struct rtllib_hdr_4addr *)skb->data;
1047         u16 fc = le16_to_cpu(hdr->frame_ctl);
1048         int idx = 0;
1049
1050         if (ieee->host_decrypt) {
1051                 if (skb->len >= hdrlen + 3)
1052                         idx = skb->data[hdrlen + 3] >> 6;
1053
1054                 *crypt = ieee->crypt_info.crypt[idx];
1055                 /* allow NULL decrypt to indicate an station specific override
1056                  * for default encryption
1057                  */
1058                 if (*crypt && ((*crypt)->ops == NULL ||
1059                               (*crypt)->ops->decrypt_mpdu == NULL))
1060                         *crypt = NULL;
1061
1062                 if (!*crypt && (fc & RTLLIB_FCTL_WEP)) {
1063                         /* This seems to be triggered by some (multicast?)
1064                          * frames from other than current BSS, so just drop the
1065                          * frames silently instead of filling system log with
1066                          * these reports.
1067                          */
1068                         netdev_dbg(ieee->dev,
1069                                    "Decryption failed (not set) (SA= %pM)\n",
1070                                    hdr->addr2);
1071                         return -1;
1072                 }
1073         }
1074
1075         return 0;
1076 }
1077
1078 static int rtllib_rx_decrypt(struct rtllib_device *ieee, struct sk_buff *skb,
1079                       struct rtllib_rx_stats *rx_stats,
1080                       struct lib80211_crypt_data *crypt, size_t hdrlen)
1081 {
1082         struct rtllib_hdr_4addr *hdr;
1083         int keyidx = 0;
1084         u16 fc, sc;
1085         u8 frag;
1086
1087         hdr = (struct rtllib_hdr_4addr *)skb->data;
1088         fc = le16_to_cpu(hdr->frame_ctl);
1089         sc = le16_to_cpu(hdr->seq_ctl);
1090         frag = WLAN_GET_SEQ_FRAG(sc);
1091
1092         if ((!rx_stats->Decrypted))
1093                 ieee->need_sw_enc = 1;
1094         else
1095                 ieee->need_sw_enc = 0;
1096
1097         keyidx = rtllib_rx_frame_decrypt(ieee, skb, crypt);
1098         if (ieee->host_decrypt && (fc & RTLLIB_FCTL_WEP) && (keyidx < 0)) {
1099                 netdev_info(ieee->dev, "%s: decrypt frame error\n", __func__);
1100                 return -1;
1101         }
1102
1103         hdr = (struct rtllib_hdr_4addr *) skb->data;
1104         if ((frag != 0 || (fc & RTLLIB_FCTL_MOREFRAGS))) {
1105                 int flen;
1106                 struct sk_buff *frag_skb = rtllib_frag_cache_get(ieee, hdr);
1107
1108                 netdev_dbg(ieee->dev, "Rx Fragment received (%u)\n", frag);
1109
1110                 if (!frag_skb) {
1111                         netdev_dbg(ieee->dev,
1112                                    "Rx cannot get skb from fragment cache (morefrag=%d seq=%u frag=%u)\n",
1113                                    (fc & RTLLIB_FCTL_MOREFRAGS) != 0,
1114                                    WLAN_GET_SEQ_SEQ(sc), frag);
1115                         return -1;
1116                 }
1117                 flen = skb->len;
1118                 if (frag != 0)
1119                         flen -= hdrlen;
1120
1121                 if (frag_skb->tail + flen > frag_skb->end) {
1122                         netdev_warn(ieee->dev,
1123                                     "%s: host decrypted and reassembled frame did not fit skb\n",
1124                                     __func__);
1125                         rtllib_frag_cache_invalidate(ieee, hdr);
1126                         return -1;
1127                 }
1128
1129                 if (frag == 0) {
1130                         /* copy first fragment (including full headers) into
1131                          * beginning of the fragment cache skb
1132                          */
1133                         skb_put_data(frag_skb, skb->data, flen);
1134                 } else {
1135                         /* append frame payload to the end of the fragment
1136                          * cache skb
1137                          */
1138                         skb_put_data(frag_skb, skb->data + hdrlen, flen);
1139                 }
1140                 dev_kfree_skb_any(skb);
1141                 skb = NULL;
1142
1143                 if (fc & RTLLIB_FCTL_MOREFRAGS) {
1144                         /* more fragments expected - leave the skb in fragment
1145                          * cache for now; it will be delivered to upper layers
1146                          * after all fragments have been received
1147                          */
1148                         return -2;
1149                 }
1150
1151                 /* this was the last fragment and the frame will be
1152                  * delivered, so remove skb from fragment cache
1153                  */
1154                 skb = frag_skb;
1155                 hdr = (struct rtllib_hdr_4addr *) skb->data;
1156                 rtllib_frag_cache_invalidate(ieee, hdr);
1157         }
1158
1159         /* skb: hdr + (possible reassembled) full MSDU payload; possibly still
1160          * encrypted/authenticated
1161          */
1162         if (ieee->host_decrypt && (fc & RTLLIB_FCTL_WEP) &&
1163                 rtllib_rx_frame_decrypt_msdu(ieee, skb, keyidx, crypt)) {
1164                 netdev_info(ieee->dev, "%s: ==>decrypt msdu error\n", __func__);
1165                 return -1;
1166         }
1167
1168         hdr = (struct rtllib_hdr_4addr *) skb->data;
1169         if (crypt && !(fc & RTLLIB_FCTL_WEP) && !ieee->open_wep) {
1170                 if (/*ieee->ieee802_1x &&*/
1171                     rtllib_is_eapol_frame(ieee, skb, hdrlen)) {
1172
1173                         /* pass unencrypted EAPOL frames even if encryption is
1174                          * configured
1175                          */
1176                         struct eapol *eap = (struct eapol *)(skb->data +
1177                                 24);
1178                         netdev_dbg(ieee->dev,
1179                                    "RX: IEEE 802.1X EAPOL frame: %s\n",
1180                                    eap_get_type(eap->type));
1181                 } else {
1182                         netdev_dbg(ieee->dev,
1183                                    "encryption configured, but RX frame not encrypted (SA= %pM)\n",
1184                                    hdr->addr2);
1185                         return -1;
1186                 }
1187         }
1188
1189         if (crypt && !(fc & RTLLIB_FCTL_WEP) &&
1190             rtllib_is_eapol_frame(ieee, skb, hdrlen)) {
1191                 struct eapol *eap = (struct eapol *)(skb->data + 24);
1192
1193                 netdev_dbg(ieee->dev, "RX: IEEE 802.1X EAPOL frame: %s\n",
1194                            eap_get_type(eap->type));
1195         }
1196
1197         if (crypt && !(fc & RTLLIB_FCTL_WEP) && !ieee->open_wep &&
1198             !rtllib_is_eapol_frame(ieee, skb, hdrlen)) {
1199                 netdev_dbg(ieee->dev,
1200                            "dropped unencrypted RX data frame from %pM (drop_unencrypted=1)\n",
1201                            hdr->addr2);
1202                 return -1;
1203         }
1204
1205         return 0;
1206 }
1207
1208 static void rtllib_rx_check_leave_lps(struct rtllib_device *ieee, u8 unicast,
1209                                       u8 nr_subframes)
1210 {
1211         if (unicast) {
1212
1213                 if (ieee->state == RTLLIB_LINKED) {
1214                         if (((ieee->LinkDetectInfo.NumRxUnicastOkInPeriod +
1215                             ieee->LinkDetectInfo.NumTxOkInPeriod) > 8) ||
1216                             (ieee->LinkDetectInfo.NumRxUnicastOkInPeriod > 2)) {
1217                                 if (ieee->LeisurePSLeave)
1218                                         ieee->LeisurePSLeave(ieee->dev);
1219                         }
1220                 }
1221         }
1222         ieee->last_rx_ps_time = jiffies;
1223 }
1224
1225 static void rtllib_rx_indicate_pkt_legacy(struct rtllib_device *ieee,
1226                 struct rtllib_rx_stats *rx_stats,
1227                 struct rtllib_rxb *rxb,
1228                 u8 *dst,
1229                 u8 *src)
1230 {
1231         struct net_device *dev = ieee->dev;
1232         u16 ethertype;
1233         int i = 0;
1234
1235         if (rxb == NULL) {
1236                 netdev_info(dev, "%s: rxb is NULL!!\n", __func__);
1237                 return;
1238         }
1239
1240         for (i = 0; i < rxb->nr_subframes; i++) {
1241                 struct sk_buff *sub_skb = rxb->subframes[i];
1242
1243                 if (sub_skb) {
1244                         /* convert hdr + possible LLC headers
1245                          * into Ethernet header
1246                          */
1247                         ethertype = (sub_skb->data[6] << 8) | sub_skb->data[7];
1248                         if (sub_skb->len >= 8 &&
1249                                 ((memcmp(sub_skb->data, rfc1042_header, SNAP_SIZE) == 0 &&
1250                                 ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
1251                                 memcmp(sub_skb->data, bridge_tunnel_header, SNAP_SIZE) == 0)) {
1252                                 /* remove RFC1042 or Bridge-Tunnel encapsulation
1253                                  * and replace EtherType
1254                                  */
1255                                 skb_pull(sub_skb, SNAP_SIZE);
1256                                 ether_addr_copy(skb_push(sub_skb, ETH_ALEN),
1257                                                 src);
1258                                 ether_addr_copy(skb_push(sub_skb, ETH_ALEN),
1259                                                 dst);
1260                         } else {
1261                                 u16 len;
1262                                 /* Leave Ethernet header part of hdr
1263                                  * and full payload
1264                                  */
1265                                 len = sub_skb->len;
1266                                 memcpy(skb_push(sub_skb, 2), &len, 2);
1267                                 ether_addr_copy(skb_push(sub_skb, ETH_ALEN),
1268                                                 src);
1269                                 ether_addr_copy(skb_push(sub_skb, ETH_ALEN),
1270                                                 dst);
1271                         }
1272
1273                         ieee->stats.rx_packets++;
1274                         ieee->stats.rx_bytes += sub_skb->len;
1275
1276                         if (is_multicast_ether_addr(dst))
1277                                 ieee->stats.multicast++;
1278
1279                         /* Indicate the packets to upper layer */
1280                         memset(sub_skb->cb, 0, sizeof(sub_skb->cb));
1281                         sub_skb->protocol = eth_type_trans(sub_skb, dev);
1282                         sub_skb->dev = dev;
1283                         sub_skb->dev->stats.rx_packets++;
1284                         sub_skb->dev->stats.rx_bytes += sub_skb->len;
1285                         /* 802.11 crc not sufficient */
1286                         sub_skb->ip_summed = CHECKSUM_NONE;
1287                         netif_rx(sub_skb);
1288                 }
1289         }
1290         kfree(rxb);
1291 }
1292
1293 static int rtllib_rx_InfraAdhoc(struct rtllib_device *ieee, struct sk_buff *skb,
1294                  struct rtllib_rx_stats *rx_stats)
1295 {
1296         struct net_device *dev = ieee->dev;
1297         struct rtllib_hdr_4addr *hdr = (struct rtllib_hdr_4addr *)skb->data;
1298         struct lib80211_crypt_data *crypt = NULL;
1299         struct rtllib_rxb *rxb = NULL;
1300         struct rx_ts_record *pTS = NULL;
1301         u16 fc, sc, SeqNum = 0;
1302         u8 type, stype, multicast = 0, unicast = 0, nr_subframes = 0, TID = 0;
1303         u8 dst[ETH_ALEN];
1304         u8 src[ETH_ALEN];
1305         u8 bssid[ETH_ALEN] = {0};
1306
1307         size_t hdrlen = 0;
1308         bool bToOtherSTA = false;
1309         int ret = 0, i = 0;
1310
1311         fc = le16_to_cpu(hdr->frame_ctl);
1312         type = WLAN_FC_GET_TYPE(fc);
1313         stype = WLAN_FC_GET_STYPE(fc);
1314         sc = le16_to_cpu(hdr->seq_ctl);
1315
1316         /*Filter pkt not to me*/
1317         multicast = is_multicast_ether_addr(hdr->addr1);
1318         unicast = !multicast;
1319         if (unicast && !ether_addr_equal(dev->dev_addr, hdr->addr1)) {
1320                 if (ieee->bNetPromiscuousMode)
1321                         bToOtherSTA = true;
1322                 else
1323                         goto rx_dropped;
1324         }
1325
1326         /*Filter pkt has too small length */
1327         hdrlen = rtllib_rx_get_hdrlen(ieee, skb, rx_stats);
1328         if (skb->len < hdrlen) {
1329                 netdev_info(dev,
1330                             "%s():ERR!!! skb->len is smaller than hdrlen\n",
1331                             __func__);
1332                 goto rx_dropped;
1333         }
1334
1335         /* Filter Duplicate pkt */
1336         ret = rtllib_rx_check_duplicate(ieee, skb, multicast);
1337         if (ret < 0)
1338                 goto rx_dropped;
1339
1340         /* Filter CTRL Frame */
1341         if (type == RTLLIB_FTYPE_CTL)
1342                 goto rx_dropped;
1343
1344         /* Filter MGNT Frame */
1345         if (type == RTLLIB_FTYPE_MGMT) {
1346                 if (bToOtherSTA)
1347                         goto rx_dropped;
1348                 if (rtllib_rx_frame_mgmt(ieee, skb, rx_stats, type, stype))
1349                         goto rx_dropped;
1350                 else
1351                         goto rx_exit;
1352         }
1353
1354         /* Filter WAPI DATA Frame */
1355
1356         /* Update statstics for AP roaming */
1357         if (!bToOtherSTA) {
1358                 ieee->LinkDetectInfo.NumRecvDataInPeriod++;
1359                 ieee->LinkDetectInfo.NumRxOkInPeriod++;
1360         }
1361
1362         /* Data frame - extract src/dst addresses */
1363         rtllib_rx_extract_addr(ieee, hdr, dst, src, bssid);
1364
1365         /* Filter Data frames */
1366         ret = rtllib_rx_data_filter(ieee, fc, dst, src, bssid, hdr->addr2);
1367         if (ret < 0)
1368                 goto rx_dropped;
1369
1370         if (skb->len == hdrlen)
1371                 goto rx_dropped;
1372
1373         /* Send pspoll based on moredata */
1374         if ((ieee->iw_mode == IW_MODE_INFRA)  &&
1375             (ieee->sta_sleep == LPS_IS_SLEEP) &&
1376             (ieee->polling) && (!bToOtherSTA)) {
1377                 if (WLAN_FC_MORE_DATA(fc)) {
1378                         /* more data bit is set, let's request a new frame
1379                          * from the AP
1380                          */
1381                         rtllib_sta_ps_send_pspoll_frame(ieee);
1382                 } else {
1383                         ieee->polling =  false;
1384                 }
1385         }
1386
1387         /* Get crypt if encrypted */
1388         ret = rtllib_rx_get_crypt(ieee, skb, &crypt, hdrlen);
1389         if (ret == -1)
1390                 goto rx_dropped;
1391
1392         /* Decrypt data frame (including reassemble) */
1393         ret = rtllib_rx_decrypt(ieee, skb, rx_stats, crypt, hdrlen);
1394         if (ret == -1)
1395                 goto rx_dropped;
1396         else if (ret == -2)
1397                 goto rx_exit;
1398
1399         /* Get TS for Rx Reorder  */
1400         hdr = (struct rtllib_hdr_4addr *) skb->data;
1401         if (ieee->current_network.qos_data.active && IsQoSDataFrame(skb->data)
1402                 && !is_multicast_ether_addr(hdr->addr1)
1403                 && (!bToOtherSTA)) {
1404                 TID = Frame_QoSTID(skb->data);
1405                 SeqNum = WLAN_GET_SEQ_SEQ(sc);
1406                 GetTs(ieee, (struct ts_common_info **) &pTS, hdr->addr2, TID,
1407                       RX_DIR, true);
1408                 if (TID != 0 && TID != 3)
1409                         ieee->bis_any_nonbepkts = true;
1410         }
1411
1412         /* Parse rx data frame (For AMSDU) */
1413         /* skb: hdr + (possible reassembled) full plaintext payload */
1414         rxb = kmalloc(sizeof(struct rtllib_rxb), GFP_ATOMIC);
1415         if (!rxb)
1416                 goto rx_dropped;
1417
1418         /* to parse amsdu packets */
1419         /* qos data packets & reserved bit is 1 */
1420         if (parse_subframe(ieee, skb, rx_stats, rxb, src, dst) == 0) {
1421                 /* only to free rxb, and not submit the packets
1422                  * to upper layer
1423                  */
1424                 for (i = 0; i < rxb->nr_subframes; i++)
1425                         dev_kfree_skb(rxb->subframes[i]);
1426                 kfree(rxb);
1427                 rxb = NULL;
1428                 goto rx_dropped;
1429         }
1430
1431         /* Update WAPI PN */
1432
1433         /* Check if leave LPS */
1434         if (!bToOtherSTA) {
1435                 if (ieee->bIsAggregateFrame)
1436                         nr_subframes = rxb->nr_subframes;
1437                 else
1438                         nr_subframes = 1;
1439                 if (unicast)
1440                         ieee->LinkDetectInfo.NumRxUnicastOkInPeriod += nr_subframes;
1441                 rtllib_rx_check_leave_lps(ieee, unicast, nr_subframes);
1442         }
1443
1444         /* Indicate packets to upper layer or Rx Reorder */
1445         if (!ieee->pHTInfo->bCurRxReorderEnable || pTS == NULL || bToOtherSTA)
1446                 rtllib_rx_indicate_pkt_legacy(ieee, rx_stats, rxb, dst, src);
1447         else
1448                 RxReorderIndicatePacket(ieee, rxb, pTS, SeqNum);
1449
1450         dev_kfree_skb(skb);
1451
1452  rx_exit:
1453         return 1;
1454
1455  rx_dropped:
1456         ieee->stats.rx_dropped++;
1457
1458         /* Returning 0 indicates to caller that we have not handled the SKB--
1459          * so it is still allocated and can be used again by underlying
1460          * hardware as a DMA target
1461          */
1462         return 0;
1463 }
1464
1465 static int rtllib_rx_Master(struct rtllib_device *ieee, struct sk_buff *skb,
1466                  struct rtllib_rx_stats *rx_stats)
1467 {
1468         return 0;
1469 }
1470
1471 static int rtllib_rx_Monitor(struct rtllib_device *ieee, struct sk_buff *skb,
1472                  struct rtllib_rx_stats *rx_stats)
1473 {
1474         struct rtllib_hdr_4addr *hdr = (struct rtllib_hdr_4addr *)skb->data;
1475         u16 fc = le16_to_cpu(hdr->frame_ctl);
1476         size_t hdrlen = rtllib_get_hdrlen(fc);
1477
1478         if (skb->len < hdrlen) {
1479                 netdev_info(ieee->dev,
1480                             "%s():ERR!!! skb->len is smaller than hdrlen\n",
1481                             __func__);
1482                 return 0;
1483         }
1484
1485         if (HTCCheck(ieee, skb->data)) {
1486                 if (net_ratelimit())
1487                         netdev_info(ieee->dev, "%s: Find HTCControl!\n",
1488                                     __func__);
1489                 hdrlen += 4;
1490         }
1491
1492         rtllib_monitor_rx(ieee, skb, rx_stats, hdrlen);
1493         ieee->stats.rx_packets++;
1494         ieee->stats.rx_bytes += skb->len;
1495
1496         return 1;
1497 }
1498
1499 static int rtllib_rx_Mesh(struct rtllib_device *ieee, struct sk_buff *skb,
1500                  struct rtllib_rx_stats *rx_stats)
1501 {
1502         return 0;
1503 }
1504
1505 /* All received frames are sent to this function. @skb contains the frame in
1506  * IEEE 802.11 format, i.e., in the format it was sent over air.
1507  * This function is called only as a tasklet (software IRQ).
1508  */
1509 int rtllib_rx(struct rtllib_device *ieee, struct sk_buff *skb,
1510                  struct rtllib_rx_stats *rx_stats)
1511 {
1512         int ret = 0;
1513
1514         if (!ieee || !skb || !rx_stats) {
1515                 pr_info("%s: Input parameters NULL!\n", __func__);
1516                 goto rx_dropped;
1517         }
1518         if (skb->len < 10) {
1519                 netdev_info(ieee->dev, "%s: SKB length < 10\n", __func__);
1520                 goto rx_dropped;
1521         }
1522
1523         switch (ieee->iw_mode) {
1524         case IW_MODE_ADHOC:
1525         case IW_MODE_INFRA:
1526                 ret = rtllib_rx_InfraAdhoc(ieee, skb, rx_stats);
1527                 break;
1528         case IW_MODE_MASTER:
1529         case IW_MODE_REPEAT:
1530                 ret = rtllib_rx_Master(ieee, skb, rx_stats);
1531                 break;
1532         case IW_MODE_MONITOR:
1533                 ret = rtllib_rx_Monitor(ieee, skb, rx_stats);
1534                 break;
1535         case IW_MODE_MESH:
1536                 ret = rtllib_rx_Mesh(ieee, skb, rx_stats);
1537                 break;
1538         default:
1539                 netdev_info(ieee->dev, "%s: ERR iw mode!!!\n", __func__);
1540                 break;
1541         }
1542
1543         return ret;
1544
1545  rx_dropped:
1546         if (ieee)
1547                 ieee->stats.rx_dropped++;
1548         return 0;
1549 }
1550 EXPORT_SYMBOL(rtllib_rx);
1551
1552 static u8 qos_oui[QOS_OUI_LEN] = { 0x00, 0x50, 0xF2 };
1553
1554 /* Make ther structure we read from the beacon packet has the right values */
1555 static int rtllib_verify_qos_info(struct rtllib_qos_information_element
1556                                      *info_element, int sub_type)
1557 {
1558
1559         if (info_element->elementID != QOS_ELEMENT_ID)
1560                 return -1;
1561         if (info_element->qui_subtype != sub_type)
1562                 return -1;
1563         if (memcmp(info_element->qui, qos_oui, QOS_OUI_LEN))
1564                 return -1;
1565         if (info_element->qui_type != QOS_OUI_TYPE)
1566                 return -1;
1567         if (info_element->version != QOS_VERSION_1)
1568                 return -1;
1569
1570         return 0;
1571 }
1572
1573
1574 /* Parse a QoS parameter element */
1575 static int rtllib_read_qos_param_element(
1576                         struct rtllib_qos_parameter_info *element_param,
1577                         struct rtllib_info_element *info_element)
1578 {
1579         size_t size = sizeof(*element_param);
1580
1581         if (!element_param || !info_element || info_element->len != size - 2)
1582                 return -1;
1583
1584         memcpy(element_param, info_element, size);
1585         return rtllib_verify_qos_info(&element_param->info_element,
1586                                       QOS_OUI_PARAM_SUB_TYPE);
1587 }
1588
1589 /* Parse a QoS information element */
1590 static int rtllib_read_qos_info_element(
1591                         struct rtllib_qos_information_element *element_info,
1592                         struct rtllib_info_element *info_element)
1593 {
1594         size_t size = sizeof(*element_info);
1595
1596         if (!element_info || !info_element || info_element->len != size - 2)
1597                 return -1;
1598
1599         memcpy(element_info, info_element, size);
1600         return rtllib_verify_qos_info(element_info, QOS_OUI_INFO_SUB_TYPE);
1601 }
1602
1603
1604 /* Write QoS parameters from the ac parameters. */
1605 static int rtllib_qos_convert_ac_to_parameters(struct rtllib_qos_parameter_info *param_elm,
1606                                                struct rtllib_qos_data *qos_data)
1607 {
1608         struct rtllib_qos_ac_parameter *ac_params;
1609         struct rtllib_qos_parameters *qos_param = &(qos_data->parameters);
1610         int i;
1611         u8 aci;
1612         u8 acm;
1613
1614         qos_data->wmm_acm = 0;
1615         for (i = 0; i < QOS_QUEUE_NUM; i++) {
1616                 ac_params = &(param_elm->ac_params_record[i]);
1617
1618                 aci = (ac_params->aci_aifsn & 0x60) >> 5;
1619                 acm = (ac_params->aci_aifsn & 0x10) >> 4;
1620
1621                 if (aci >= QOS_QUEUE_NUM)
1622                         continue;
1623                 switch (aci) {
1624                 case 1:
1625                         /* BIT(0) | BIT(3) */
1626                         if (acm)
1627                                 qos_data->wmm_acm |= (0x01<<0)|(0x01<<3);
1628                         break;
1629                 case 2:
1630                         /* BIT(4) | BIT(5) */
1631                         if (acm)
1632                                 qos_data->wmm_acm |= (0x01<<4)|(0x01<<5);
1633                         break;
1634                 case 3:
1635                         /* BIT(6) | BIT(7) */
1636                         if (acm)
1637                                 qos_data->wmm_acm |= (0x01<<6)|(0x01<<7);
1638                         break;
1639                 case 0:
1640                 default:
1641                         /* BIT(1) | BIT(2) */
1642                         if (acm)
1643                                 qos_data->wmm_acm |= (0x01<<1)|(0x01<<2);
1644                         break;
1645                 }
1646
1647                 qos_param->aifs[aci] = (ac_params->aci_aifsn) & 0x0f;
1648
1649                 /* WMM spec P.11: The minimum value for AIFSN shall be 2 */
1650                 qos_param->aifs[aci] = max_t(u8, qos_param->aifs[aci], 2);
1651
1652                 qos_param->cw_min[aci] = cpu_to_le16(ac_params->ecw_min_max &
1653                                                      0x0F);
1654
1655                 qos_param->cw_max[aci] = cpu_to_le16((ac_params->ecw_min_max &
1656                                                       0xF0) >> 4);
1657
1658                 qos_param->flag[aci] =
1659                     (ac_params->aci_aifsn & 0x10) ? 0x01 : 0x00;
1660                 qos_param->tx_op_limit[aci] = ac_params->tx_op_limit;
1661         }
1662         return 0;
1663 }
1664
1665 /* we have a generic data element which it may contain QoS information or
1666  * parameters element. check the information element length to decide
1667  * which type to read
1668  */
1669 static int rtllib_parse_qos_info_param_IE(struct rtllib_device *ieee,
1670                                           struct rtllib_info_element
1671                                              *info_element,
1672                                           struct rtllib_network *network)
1673 {
1674         int rc = 0;
1675         struct rtllib_qos_information_element qos_info_element;
1676
1677         rc = rtllib_read_qos_info_element(&qos_info_element, info_element);
1678
1679         if (rc == 0) {
1680                 network->qos_data.param_count = qos_info_element.ac_info & 0x0F;
1681                 network->flags |= NETWORK_HAS_QOS_INFORMATION;
1682         } else {
1683                 struct rtllib_qos_parameter_info param_element;
1684
1685                 rc = rtllib_read_qos_param_element(&param_element,
1686                                                       info_element);
1687                 if (rc == 0) {
1688                         rtllib_qos_convert_ac_to_parameters(&param_element,
1689                                                                &(network->qos_data));
1690                         network->flags |= NETWORK_HAS_QOS_PARAMETERS;
1691                         network->qos_data.param_count =
1692                             param_element.info_element.ac_info & 0x0F;
1693                 }
1694         }
1695
1696         if (rc == 0) {
1697                 netdev_dbg(ieee->dev, "QoS is supported\n");
1698                 network->qos_data.supported = 1;
1699         }
1700         return rc;
1701 }
1702
1703 static const char *get_info_element_string(u16 id)
1704 {
1705         switch (id) {
1706         case MFIE_TYPE_SSID:
1707                 return "SSID";
1708         case MFIE_TYPE_RATES:
1709                 return "RATES";
1710         case MFIE_TYPE_FH_SET:
1711                 return "FH_SET";
1712         case MFIE_TYPE_DS_SET:
1713                 return "DS_SET";
1714         case MFIE_TYPE_CF_SET:
1715                 return "CF_SET";
1716         case MFIE_TYPE_TIM:
1717                 return "TIM";
1718         case MFIE_TYPE_IBSS_SET:
1719                 return "IBSS_SET";
1720         case MFIE_TYPE_COUNTRY:
1721                 return "COUNTRY";
1722         case MFIE_TYPE_HOP_PARAMS:
1723                 return "HOP_PARAMS";
1724         case MFIE_TYPE_HOP_TABLE:
1725                 return "HOP_TABLE";
1726         case MFIE_TYPE_REQUEST:
1727                 return "REQUEST";
1728         case MFIE_TYPE_CHALLENGE:
1729                 return "CHALLENGE";
1730         case MFIE_TYPE_POWER_CONSTRAINT:
1731                 return "POWER_CONSTRAINT";
1732         case MFIE_TYPE_POWER_CAPABILITY:
1733                 return "POWER_CAPABILITY";
1734         case MFIE_TYPE_TPC_REQUEST:
1735                 return "TPC_REQUEST";
1736         case MFIE_TYPE_TPC_REPORT:
1737                 return "TPC_REPORT";
1738         case MFIE_TYPE_SUPP_CHANNELS:
1739                 return "SUPP_CHANNELS";
1740         case MFIE_TYPE_CSA:
1741                 return "CSA";
1742         case MFIE_TYPE_MEASURE_REQUEST:
1743                 return "MEASURE_REQUEST";
1744         case MFIE_TYPE_MEASURE_REPORT:
1745                 return "MEASURE_REPORT";
1746         case MFIE_TYPE_QUIET:
1747                 return "QUIET";
1748         case MFIE_TYPE_IBSS_DFS:
1749                 return "IBSS_DFS";
1750         case MFIE_TYPE_RSN:
1751                 return "RSN";
1752         case MFIE_TYPE_RATES_EX:
1753                 return "RATES_EX";
1754         case MFIE_TYPE_GENERIC:
1755                 return "GENERIC";
1756         case MFIE_TYPE_QOS_PARAMETER:
1757                 return "QOS_PARAMETER";
1758         default:
1759                 return "UNKNOWN";
1760         }
1761 }
1762
1763 static inline void rtllib_extract_country_ie(
1764         struct rtllib_device *ieee,
1765         struct rtllib_info_element *info_element,
1766         struct rtllib_network *network,
1767         u8 *addr2)
1768 {
1769         if (IS_DOT11D_ENABLE(ieee)) {
1770                 if (info_element->len != 0) {
1771                         memcpy(network->CountryIeBuf, info_element->data,
1772                                info_element->len);
1773                         network->CountryIeLen = info_element->len;
1774
1775                         if (!IS_COUNTRY_IE_VALID(ieee)) {
1776                                 if (rtllib_act_scanning(ieee, false) &&
1777                                     ieee->FirstIe_InScan)
1778                                         netdev_info(ieee->dev,
1779                                                     "Received beacon ContryIE, SSID: <%s>\n",
1780                                                     network->ssid);
1781                                 dot11d_update_country(ieee, addr2,
1782                                                        info_element->len,
1783                                                        info_element->data);
1784                         }
1785                 }
1786
1787                 if (IS_EQUAL_CIE_SRC(ieee, addr2))
1788                         UPDATE_CIE_WATCHDOG(ieee);
1789         }
1790 }
1791
1792 static void rtllib_parse_mife_generic(struct rtllib_device *ieee,
1793                                       struct rtllib_info_element *info_element,
1794                                       struct rtllib_network *network,
1795                                       u16 *tmp_htcap_len,
1796                                       u16 *tmp_htinfo_len)
1797 {
1798         u16 ht_realtek_agg_len = 0;
1799         u8  ht_realtek_agg_buf[MAX_IE_LEN];
1800
1801         if (!rtllib_parse_qos_info_param_IE(ieee, info_element, network))
1802                 return;
1803         if (info_element->len >= 4 &&
1804             info_element->data[0] == 0x00 &&
1805             info_element->data[1] == 0x50 &&
1806             info_element->data[2] == 0xf2 &&
1807             info_element->data[3] == 0x01) {
1808                 network->wpa_ie_len = min(info_element->len + 2,
1809                                           MAX_WPA_IE_LEN);
1810                 memcpy(network->wpa_ie, info_element, network->wpa_ie_len);
1811                 return;
1812         }
1813         if (info_element->len == 7 &&
1814             info_element->data[0] == 0x00 &&
1815             info_element->data[1] == 0xe0 &&
1816             info_element->data[2] == 0x4c &&
1817             info_element->data[3] == 0x01 &&
1818             info_element->data[4] == 0x02)
1819                 network->Turbo_Enable = 1;
1820
1821         if (*tmp_htcap_len == 0) {
1822                 if (info_element->len >= 4 &&
1823                     info_element->data[0] == 0x00 &&
1824                     info_element->data[1] == 0x90 &&
1825                     info_element->data[2] == 0x4c &&
1826                     info_element->data[3] == 0x033) {
1827                         *tmp_htcap_len = min_t(u8, info_element->len,
1828                                                MAX_IE_LEN);
1829                         if (*tmp_htcap_len != 0) {
1830                                 network->bssht.bd_ht_spec_ver = HT_SPEC_VER_EWC;
1831                                 network->bssht.bd_ht_cap_len = min_t(u16, *tmp_htcap_len,
1832                                                                   sizeof(network->bssht.bd_ht_cap_buf));
1833                                 memcpy(network->bssht.bd_ht_cap_buf,
1834                                        info_element->data,
1835                                        network->bssht.bd_ht_cap_len);
1836                         }
1837                 }
1838                 if (*tmp_htcap_len != 0) {
1839                         network->bssht.bd_support_ht = true;
1840                         network->bssht.bd_ht_1r = ((((struct ht_capab_ele *)(network->bssht.bd_ht_cap_buf))->MCS[1]) == 0);
1841                 } else {
1842                         network->bssht.bd_support_ht = false;
1843                         network->bssht.bd_ht_1r = false;
1844                 }
1845         }
1846
1847
1848         if (*tmp_htinfo_len == 0) {
1849                 if (info_element->len >= 4 &&
1850                     info_element->data[0] == 0x00 &&
1851                     info_element->data[1] == 0x90 &&
1852                     info_element->data[2] == 0x4c &&
1853                     info_element->data[3] == 0x034) {
1854                         *tmp_htinfo_len = min_t(u8, info_element->len,
1855                                                 MAX_IE_LEN);
1856                         if (*tmp_htinfo_len != 0) {
1857                                 network->bssht.bd_ht_spec_ver = HT_SPEC_VER_EWC;
1858                                 network->bssht.bd_ht_info_len = min_t(u16, *tmp_htinfo_len,
1859                                                                       sizeof(network->bssht.bd_ht_info_buf));
1860                                 memcpy(network->bssht.bd_ht_info_buf,
1861                                        info_element->data,
1862                                        network->bssht.bd_ht_info_len);
1863                         }
1864                 }
1865         }
1866
1867         if (network->bssht.bd_support_ht) {
1868                 if (info_element->len >= 4 &&
1869                     info_element->data[0] == 0x00 &&
1870                     info_element->data[1] == 0xe0 &&
1871                     info_element->data[2] == 0x4c &&
1872                     info_element->data[3] == 0x02) {
1873                         ht_realtek_agg_len = min_t(u8, info_element->len,
1874                                                    MAX_IE_LEN);
1875                         memcpy(ht_realtek_agg_buf, info_element->data,
1876                                info_element->len);
1877                 }
1878                 if (ht_realtek_agg_len >= 5) {
1879                         network->realtek_cap_exit = true;
1880                         network->bssht.bd_rt2rt_aggregation = true;
1881
1882                         if ((ht_realtek_agg_buf[4] == 1) &&
1883                             (ht_realtek_agg_buf[5] & 0x02))
1884                                 network->bssht.bd_rt2rt_long_slot_time = true;
1885
1886                         if ((ht_realtek_agg_buf[4] == 1) &&
1887                             (ht_realtek_agg_buf[5] & RT_HT_CAP_USE_92SE))
1888                                 network->bssht.rt2rt_ht_mode |= RT_HT_CAP_USE_92SE;
1889                 }
1890         }
1891         if (ht_realtek_agg_len >= 5) {
1892                 if ((ht_realtek_agg_buf[5] & RT_HT_CAP_USE_SOFTAP))
1893                         network->bssht.rt2rt_ht_mode |= RT_HT_CAP_USE_SOFTAP;
1894         }
1895
1896         if ((info_element->len >= 3 &&
1897              info_element->data[0] == 0x00 &&
1898              info_element->data[1] == 0x05 &&
1899              info_element->data[2] == 0xb5) ||
1900              (info_element->len >= 3 &&
1901              info_element->data[0] == 0x00 &&
1902              info_element->data[1] == 0x0a &&
1903              info_element->data[2] == 0xf7) ||
1904              (info_element->len >= 3 &&
1905              info_element->data[0] == 0x00 &&
1906              info_element->data[1] == 0x10 &&
1907              info_element->data[2] == 0x18)) {
1908                 network->broadcom_cap_exist = true;
1909         }
1910         if (info_element->len >= 3 &&
1911             info_element->data[0] == 0x00 &&
1912             info_element->data[1] == 0x0c &&
1913             info_element->data[2] == 0x43)
1914                 network->ralink_cap_exist = true;
1915         if ((info_element->len >= 3 &&
1916              info_element->data[0] == 0x00 &&
1917              info_element->data[1] == 0x03 &&
1918              info_element->data[2] == 0x7f) ||
1919              (info_element->len >= 3 &&
1920              info_element->data[0] == 0x00 &&
1921              info_element->data[1] == 0x13 &&
1922              info_element->data[2] == 0x74))
1923                 network->atheros_cap_exist = true;
1924
1925         if ((info_element->len >= 3 &&
1926              info_element->data[0] == 0x00 &&
1927              info_element->data[1] == 0x50 &&
1928              info_element->data[2] == 0x43))
1929                 network->marvell_cap_exist = true;
1930         if (info_element->len >= 3 &&
1931             info_element->data[0] == 0x00 &&
1932             info_element->data[1] == 0x40 &&
1933             info_element->data[2] == 0x96)
1934                 network->cisco_cap_exist = true;
1935
1936
1937         if (info_element->len >= 3 &&
1938             info_element->data[0] == 0x00 &&
1939             info_element->data[1] == 0x0a &&
1940             info_element->data[2] == 0xf5)
1941                 network->airgo_cap_exist = true;
1942
1943         if (info_element->len > 4 &&
1944             info_element->data[0] == 0x00 &&
1945             info_element->data[1] == 0x40 &&
1946             info_element->data[2] == 0x96 &&
1947             info_element->data[3] == 0x01) {
1948                 if (info_element->len == 6) {
1949                         memcpy(network->CcxRmState, &info_element->data[4], 2);
1950                         if (network->CcxRmState[0] != 0)
1951                                 network->bCcxRmEnable = true;
1952                         else
1953                                 network->bCcxRmEnable = false;
1954                         network->MBssidMask = network->CcxRmState[1] & 0x07;
1955                         if (network->MBssidMask != 0) {
1956                                 network->bMBssidValid = true;
1957                                 network->MBssidMask = 0xff <<
1958                                                       (network->MBssidMask);
1959                                 ether_addr_copy(network->MBssid,
1960                                                 network->bssid);
1961                                 network->MBssid[5] &= network->MBssidMask;
1962                         } else {
1963                                 network->bMBssidValid = false;
1964                         }
1965                 } else {
1966                         network->bCcxRmEnable = false;
1967                 }
1968         }
1969         if (info_element->len > 4  &&
1970             info_element->data[0] == 0x00 &&
1971             info_element->data[1] == 0x40 &&
1972             info_element->data[2] == 0x96 &&
1973             info_element->data[3] == 0x03) {
1974                 if (info_element->len == 5) {
1975                         network->bWithCcxVerNum = true;
1976                         network->BssCcxVerNumber = info_element->data[4];
1977                 } else {
1978                         network->bWithCcxVerNum = false;
1979                         network->BssCcxVerNumber = 0;
1980                 }
1981         }
1982         if (info_element->len > 4  &&
1983             info_element->data[0] == 0x00 &&
1984             info_element->data[1] == 0x50 &&
1985             info_element->data[2] == 0xf2 &&
1986             info_element->data[3] == 0x04) {
1987                 netdev_dbg(ieee->dev, "MFIE_TYPE_WZC: %d bytes\n",
1988                            info_element->len);
1989                 network->wzc_ie_len = min(info_element->len+2, MAX_WZC_IE_LEN);
1990                 memcpy(network->wzc_ie, info_element, network->wzc_ie_len);
1991         }
1992 }
1993
1994 static void rtllib_parse_mfie_ht_cap(struct rtllib_info_element *info_element,
1995                                      struct rtllib_network *network,
1996                                      u16 *tmp_htcap_len)
1997 {
1998         struct bss_ht *ht = &network->bssht;
1999
2000         *tmp_htcap_len = min_t(u8, info_element->len, MAX_IE_LEN);
2001         if (*tmp_htcap_len != 0) {
2002                 ht->bd_ht_spec_ver = HT_SPEC_VER_EWC;
2003                 ht->bd_ht_cap_len = min_t(u16, *tmp_htcap_len,
2004                                        sizeof(ht->bd_ht_cap_buf));
2005                 memcpy(ht->bd_ht_cap_buf, info_element->data, ht->bd_ht_cap_len);
2006
2007                 ht->bd_support_ht = true;
2008                 ht->bd_ht_1r = ((((struct ht_capab_ele *)
2009                                 ht->bd_ht_cap_buf))->MCS[1]) == 0;
2010
2011                 ht->bd_bandwidth = (enum ht_channel_width)
2012                                              (((struct ht_capab_ele *)
2013                                              (ht->bd_ht_cap_buf))->ChlWidth);
2014         } else {
2015                 ht->bd_support_ht = false;
2016                 ht->bd_ht_1r = false;
2017                 ht->bd_bandwidth = HT_CHANNEL_WIDTH_20;
2018         }
2019 }
2020
2021 int rtllib_parse_info_param(struct rtllib_device *ieee,
2022                 struct rtllib_info_element *info_element,
2023                 u16 length,
2024                 struct rtllib_network *network,
2025                 struct rtllib_rx_stats *stats)
2026 {
2027         u8 i;
2028         short offset;
2029         u16     tmp_htcap_len = 0;
2030         u16     tmp_htinfo_len = 0;
2031         char rates_str[64];
2032         char *p;
2033
2034         while (length >= sizeof(*info_element)) {
2035                 if (sizeof(*info_element) + info_element->len > length) {
2036                         netdev_dbg(ieee->dev,
2037                                    "Info elem: parse failed: info_element->len + 2 > left : info_element->len+2=%zd left=%d, id=%d.\n",
2038                                    info_element->len + sizeof(*info_element),
2039                                    length, info_element->id);
2040                         /* We stop processing but don't return an error here
2041                          * because some misbehaviour APs break this rule. ie.
2042                          * Orinoco AP1000.
2043                          */
2044                         break;
2045                 }
2046
2047                 switch (info_element->id) {
2048                 case MFIE_TYPE_SSID:
2049                         if (rtllib_is_empty_essid(info_element->data,
2050                                                      info_element->len)) {
2051                                 network->flags |= NETWORK_EMPTY_ESSID;
2052                                 break;
2053                         }
2054
2055                         network->ssid_len = min(info_element->len,
2056                                                 (u8) IW_ESSID_MAX_SIZE);
2057                         memcpy(network->ssid, info_element->data,
2058                                network->ssid_len);
2059                         if (network->ssid_len < IW_ESSID_MAX_SIZE)
2060                                 memset(network->ssid + network->ssid_len, 0,
2061                                        IW_ESSID_MAX_SIZE - network->ssid_len);
2062
2063                         netdev_dbg(ieee->dev, "MFIE_TYPE_SSID: '%s' len=%d.\n",
2064                                    network->ssid, network->ssid_len);
2065                         break;
2066
2067                 case MFIE_TYPE_RATES:
2068                         p = rates_str;
2069                         network->rates_len = min(info_element->len,
2070                                                  MAX_RATES_LENGTH);
2071                         for (i = 0; i < network->rates_len; i++) {
2072                                 network->rates[i] = info_element->data[i];
2073                                 p += scnprintf(p, sizeof(rates_str) -
2074                                               (p - rates_str), "%02X ",
2075                                               network->rates[i]);
2076                                 if (rtllib_is_ofdm_rate
2077                                     (info_element->data[i])) {
2078                                         network->flags |= NETWORK_HAS_OFDM;
2079                                         if (info_element->data[i] &
2080                                             RTLLIB_BASIC_RATE_MASK)
2081                                                 network->flags &=
2082                                                     ~NETWORK_HAS_CCK;
2083                                 }
2084
2085                                 if (rtllib_is_cck_rate
2086                                     (info_element->data[i])) {
2087                                         network->flags |= NETWORK_HAS_CCK;
2088                                 }
2089                         }
2090
2091                         netdev_dbg(ieee->dev, "MFIE_TYPE_RATES: '%s' (%d)\n",
2092                                    rates_str, network->rates_len);
2093                         break;
2094
2095                 case MFIE_TYPE_RATES_EX:
2096                         p = rates_str;
2097                         network->rates_ex_len = min(info_element->len,
2098                                                     MAX_RATES_EX_LENGTH);
2099                         for (i = 0; i < network->rates_ex_len; i++) {
2100                                 network->rates_ex[i] = info_element->data[i];
2101                                 p += scnprintf(p, sizeof(rates_str) -
2102                                               (p - rates_str), "%02X ",
2103                                               network->rates_ex[i]);
2104                                 if (rtllib_is_ofdm_rate
2105                                     (info_element->data[i])) {
2106                                         network->flags |= NETWORK_HAS_OFDM;
2107                                         if (info_element->data[i] &
2108                                             RTLLIB_BASIC_RATE_MASK)
2109                                                 network->flags &=
2110                                                     ~NETWORK_HAS_CCK;
2111                                 }
2112                         }
2113
2114                         netdev_dbg(ieee->dev, "MFIE_TYPE_RATES_EX: '%s' (%d)\n",
2115                                    rates_str, network->rates_ex_len);
2116                         break;
2117
2118                 case MFIE_TYPE_DS_SET:
2119                         netdev_dbg(ieee->dev, "MFIE_TYPE_DS_SET: %d\n",
2120                                    info_element->data[0]);
2121                         network->channel = info_element->data[0];
2122                         break;
2123
2124                 case MFIE_TYPE_FH_SET:
2125                         netdev_dbg(ieee->dev, "MFIE_TYPE_FH_SET: ignored\n");
2126                         break;
2127
2128                 case MFIE_TYPE_CF_SET:
2129                         netdev_dbg(ieee->dev, "MFIE_TYPE_CF_SET: ignored\n");
2130                         break;
2131
2132                 case MFIE_TYPE_TIM:
2133                         if (info_element->len < 4)
2134                                 break;
2135
2136                         network->tim.tim_count = info_element->data[0];
2137                         network->tim.tim_period = info_element->data[1];
2138
2139                         network->dtim_period = info_element->data[1];
2140                         if (ieee->state != RTLLIB_LINKED)
2141                                 break;
2142                         network->last_dtim_sta_time = jiffies;
2143
2144                         network->dtim_data = RTLLIB_DTIM_VALID;
2145
2146
2147                         if (info_element->data[2] & 1)
2148                                 network->dtim_data |= RTLLIB_DTIM_MBCAST;
2149
2150                         offset = (info_element->data[2] >> 1)*2;
2151
2152
2153                         if (ieee->assoc_id < 8*offset ||
2154                             ieee->assoc_id > 8*(offset + info_element->len - 3))
2155                                 break;
2156
2157                         offset = (ieee->assoc_id / 8) - offset;
2158                         if (info_element->data[3 + offset] &
2159                            (1 << (ieee->assoc_id % 8)))
2160                                 network->dtim_data |= RTLLIB_DTIM_UCAST;
2161
2162                         network->listen_interval = network->dtim_period;
2163                         break;
2164
2165                 case MFIE_TYPE_ERP:
2166                         network->erp_value = info_element->data[0];
2167                         network->flags |= NETWORK_HAS_ERP_VALUE;
2168                         netdev_dbg(ieee->dev, "MFIE_TYPE_ERP_SET: %d\n",
2169                                    network->erp_value);
2170                         break;
2171                 case MFIE_TYPE_IBSS_SET:
2172                         network->atim_window = info_element->data[0];
2173                         netdev_dbg(ieee->dev, "MFIE_TYPE_IBSS_SET: %d\n",
2174                                    network->atim_window);
2175                         break;
2176
2177                 case MFIE_TYPE_CHALLENGE:
2178                         netdev_dbg(ieee->dev, "MFIE_TYPE_CHALLENGE: ignored\n");
2179                         break;
2180
2181                 case MFIE_TYPE_GENERIC:
2182                         netdev_dbg(ieee->dev, "MFIE_TYPE_GENERIC: %d bytes\n",
2183                                    info_element->len);
2184
2185                         rtllib_parse_mife_generic(ieee, info_element, network,
2186                                                   &tmp_htcap_len,
2187                                                   &tmp_htinfo_len);
2188                         break;
2189
2190                 case MFIE_TYPE_RSN:
2191                         netdev_dbg(ieee->dev, "MFIE_TYPE_RSN: %d bytes\n",
2192                                    info_element->len);
2193                         network->rsn_ie_len = min(info_element->len + 2,
2194                                                   MAX_WPA_IE_LEN);
2195                         memcpy(network->rsn_ie, info_element,
2196                                network->rsn_ie_len);
2197                         break;
2198
2199                 case MFIE_TYPE_HT_CAP:
2200                         netdev_dbg(ieee->dev, "MFIE_TYPE_HT_CAP: %d bytes\n",
2201                                    info_element->len);
2202
2203                         rtllib_parse_mfie_ht_cap(info_element, network,
2204                                                  &tmp_htcap_len);
2205                         break;
2206
2207
2208                 case MFIE_TYPE_HT_INFO:
2209                         netdev_dbg(ieee->dev, "MFIE_TYPE_HT_INFO: %d bytes\n",
2210                                    info_element->len);
2211                         tmp_htinfo_len = min_t(u8, info_element->len,
2212                                                MAX_IE_LEN);
2213                         if (tmp_htinfo_len) {
2214                                 network->bssht.bd_ht_spec_ver = HT_SPEC_VER_IEEE;
2215                                 network->bssht.bd_ht_info_len = tmp_htinfo_len >
2216                                         sizeof(network->bssht.bd_ht_info_buf) ?
2217                                         sizeof(network->bssht.bd_ht_info_buf) :
2218                                         tmp_htinfo_len;
2219                                 memcpy(network->bssht.bd_ht_info_buf,
2220                                        info_element->data,
2221                                        network->bssht.bd_ht_info_len);
2222                         }
2223                         break;
2224
2225                 case MFIE_TYPE_AIRONET:
2226                         netdev_dbg(ieee->dev, "MFIE_TYPE_AIRONET: %d bytes\n",
2227                                    info_element->len);
2228                         if (info_element->len > IE_CISCO_FLAG_POSITION) {
2229                                 network->bWithAironetIE = true;
2230
2231                                 if ((info_element->data[IE_CISCO_FLAG_POSITION]
2232                                      & SUPPORT_CKIP_MIC) ||
2233                                      (info_element->data[IE_CISCO_FLAG_POSITION]
2234                                      & SUPPORT_CKIP_PK))
2235                                         network->bCkipSupported = true;
2236                                 else
2237                                         network->bCkipSupported = false;
2238                         } else {
2239                                 network->bWithAironetIE = false;
2240                                 network->bCkipSupported = false;
2241                         }
2242                         break;
2243                 case MFIE_TYPE_QOS_PARAMETER:
2244                         netdev_err(ieee->dev,
2245                                    "QoS Error need to parse QOS_PARAMETER IE\n");
2246                         break;
2247
2248                 case MFIE_TYPE_COUNTRY:
2249                         netdev_dbg(ieee->dev, "MFIE_TYPE_COUNTRY: %d bytes\n",
2250                                    info_element->len);
2251                         rtllib_extract_country_ie(ieee, info_element, network,
2252                                                   network->bssid);
2253                         break;
2254 /* TODO */
2255                 default:
2256                         netdev_dbg(ieee->dev,
2257                                    "Unsupported info element: %s (%d)\n",
2258                                    get_info_element_string(info_element->id),
2259                                    info_element->id);
2260                         break;
2261                 }
2262
2263                 length -= sizeof(*info_element) + info_element->len;
2264                 info_element =
2265                     (struct rtllib_info_element *)&info_element->data[info_element->len];
2266         }
2267
2268         if (!network->atheros_cap_exist && !network->broadcom_cap_exist &&
2269             !network->cisco_cap_exist && !network->ralink_cap_exist &&
2270             !network->bssht.bd_rt2rt_aggregation)
2271                 network->unknown_cap_exist = true;
2272         else
2273                 network->unknown_cap_exist = false;
2274         return 0;
2275 }
2276
2277 static long rtllib_translate_todbm(u8 signal_strength_index)
2278 {
2279         long    signal_power;
2280
2281         signal_power = (long)((signal_strength_index + 1) >> 1);
2282         signal_power -= 95;
2283
2284         return signal_power;
2285 }
2286
2287 static inline int rtllib_network_init(
2288         struct rtllib_device *ieee,
2289         struct rtllib_probe_response *beacon,
2290         struct rtllib_network *network,
2291         struct rtllib_rx_stats *stats)
2292 {
2293         memset(&network->qos_data, 0, sizeof(struct rtllib_qos_data));
2294
2295         /* Pull out fixed field data */
2296         ether_addr_copy(network->bssid, beacon->header.addr3);
2297         network->capability = le16_to_cpu(beacon->capability);
2298         network->last_scanned = jiffies;
2299         network->time_stamp[0] = beacon->time_stamp[0];
2300         network->time_stamp[1] = beacon->time_stamp[1];
2301         network->beacon_interval = le16_to_cpu(beacon->beacon_interval);
2302         /* Where to pull this? beacon->listen_interval;*/
2303         network->listen_interval = 0x0A;
2304         network->rates_len = network->rates_ex_len = 0;
2305         network->ssid_len = 0;
2306         network->hidden_ssid_len = 0;
2307         memset(network->hidden_ssid, 0, sizeof(network->hidden_ssid));
2308         network->flags = 0;
2309         network->atim_window = 0;
2310         network->erp_value = (network->capability & WLAN_CAPABILITY_IBSS) ?
2311             0x3 : 0x0;
2312         network->berp_info_valid = false;
2313         network->broadcom_cap_exist = false;
2314         network->ralink_cap_exist = false;
2315         network->atheros_cap_exist = false;
2316         network->cisco_cap_exist = false;
2317         network->unknown_cap_exist = false;
2318         network->realtek_cap_exit = false;
2319         network->marvell_cap_exist = false;
2320         network->airgo_cap_exist = false;
2321         network->Turbo_Enable = 0;
2322         network->SignalStrength = stats->SignalStrength;
2323         network->RSSI = stats->SignalStrength;
2324         network->CountryIeLen = 0;
2325         memset(network->CountryIeBuf, 0, MAX_IE_LEN);
2326         HTInitializeBssDesc(&network->bssht);
2327         if (stats->freq == RTLLIB_52GHZ_BAND) {
2328                 /* for A band (No DS info) */
2329                 network->channel = stats->received_channel;
2330         } else
2331                 network->flags |= NETWORK_HAS_CCK;
2332
2333         network->wpa_ie_len = 0;
2334         network->rsn_ie_len = 0;
2335         network->wzc_ie_len = 0;
2336
2337         if (rtllib_parse_info_param(ieee,
2338                         beacon->info_element,
2339                         (stats->len - sizeof(*beacon)),
2340                         network,
2341                         stats))
2342                 return 1;
2343
2344         network->mode = 0;
2345         if (stats->freq == RTLLIB_52GHZ_BAND)
2346                 network->mode = IEEE_A;
2347         else {
2348                 if (network->flags & NETWORK_HAS_OFDM)
2349                         network->mode |= IEEE_G;
2350                 if (network->flags & NETWORK_HAS_CCK)
2351                         network->mode |= IEEE_B;
2352         }
2353
2354         if (network->mode == 0) {
2355                 netdev_dbg(ieee->dev, "Filtered out '%s (%pM)' network.\n",
2356                            escape_essid(network->ssid, network->ssid_len),
2357                            network->bssid);
2358                 return 1;
2359         }
2360
2361         if (network->bssht.bd_support_ht) {
2362                 if (network->mode == IEEE_A)
2363                         network->mode = IEEE_N_5G;
2364                 else if (network->mode & (IEEE_G | IEEE_B))
2365                         network->mode = IEEE_N_24G;
2366         }
2367         if (rtllib_is_empty_essid(network->ssid, network->ssid_len))
2368                 network->flags |= NETWORK_EMPTY_ESSID;
2369         stats->signal = 30 + (stats->SignalStrength * 70) / 100;
2370         stats->noise = rtllib_translate_todbm((u8)(100-stats->signal)) - 25;
2371
2372         memcpy(&network->stats, stats, sizeof(network->stats));
2373
2374         return 0;
2375 }
2376
2377 static inline int is_same_network(struct rtllib_network *src,
2378                                   struct rtllib_network *dst, u8 ssidbroad)
2379 {
2380         /* A network is only a duplicate if the channel, BSSID, ESSID
2381          * and the capability field (in particular IBSS and BSS) all match.
2382          * We treat all <hidden> with the same BSSID and channel
2383          * as one network
2384          */
2385         return (((src->ssid_len == dst->ssid_len) || (!ssidbroad)) &&
2386                 (src->channel == dst->channel) &&
2387                 !memcmp(src->bssid, dst->bssid, ETH_ALEN) &&
2388                 (!memcmp(src->ssid, dst->ssid, src->ssid_len) ||
2389                 (!ssidbroad)) &&
2390                 ((src->capability & WLAN_CAPABILITY_IBSS) ==
2391                 (dst->capability & WLAN_CAPABILITY_IBSS)) &&
2392                 ((src->capability & WLAN_CAPABILITY_ESS) ==
2393                 (dst->capability & WLAN_CAPABILITY_ESS)));
2394 }
2395
2396
2397 static inline void update_network(struct rtllib_device *ieee,
2398                                   struct rtllib_network *dst,
2399                                   struct rtllib_network *src)
2400 {
2401         int qos_active;
2402         u8 old_param;
2403
2404         memcpy(&dst->stats, &src->stats, sizeof(struct rtllib_rx_stats));
2405         dst->capability = src->capability;
2406         memcpy(dst->rates, src->rates, src->rates_len);
2407         dst->rates_len = src->rates_len;
2408         memcpy(dst->rates_ex, src->rates_ex, src->rates_ex_len);
2409         dst->rates_ex_len = src->rates_ex_len;
2410         if (src->ssid_len > 0) {
2411                 if (dst->ssid_len == 0) {
2412                         memset(dst->hidden_ssid, 0, sizeof(dst->hidden_ssid));
2413                         dst->hidden_ssid_len = src->ssid_len;
2414                         memcpy(dst->hidden_ssid, src->ssid, src->ssid_len);
2415                 } else {
2416                         memset(dst->ssid, 0, dst->ssid_len);
2417                         dst->ssid_len = src->ssid_len;
2418                         memcpy(dst->ssid, src->ssid, src->ssid_len);
2419                 }
2420         }
2421         dst->mode = src->mode;
2422         dst->flags = src->flags;
2423         dst->time_stamp[0] = src->time_stamp[0];
2424         dst->time_stamp[1] = src->time_stamp[1];
2425         if (src->flags & NETWORK_HAS_ERP_VALUE) {
2426                 dst->erp_value = src->erp_value;
2427                 dst->berp_info_valid = src->berp_info_valid = true;
2428         }
2429         dst->beacon_interval = src->beacon_interval;
2430         dst->listen_interval = src->listen_interval;
2431         dst->atim_window = src->atim_window;
2432         dst->dtim_period = src->dtim_period;
2433         dst->dtim_data = src->dtim_data;
2434         dst->last_dtim_sta_time = src->last_dtim_sta_time;
2435         memcpy(&dst->tim, &src->tim, sizeof(struct rtllib_tim_parameters));
2436
2437         dst->bssht.bd_support_ht = src->bssht.bd_support_ht;
2438         dst->bssht.bd_rt2rt_aggregation = src->bssht.bd_rt2rt_aggregation;
2439         dst->bssht.bd_ht_cap_len = src->bssht.bd_ht_cap_len;
2440         memcpy(dst->bssht.bd_ht_cap_buf, src->bssht.bd_ht_cap_buf,
2441                src->bssht.bd_ht_cap_len);
2442         dst->bssht.bd_ht_info_len = src->bssht.bd_ht_info_len;
2443         memcpy(dst->bssht.bd_ht_info_buf, src->bssht.bd_ht_info_buf,
2444                src->bssht.bd_ht_info_len);
2445         dst->bssht.bd_ht_spec_ver = src->bssht.bd_ht_spec_ver;
2446         dst->bssht.bd_rt2rt_long_slot_time = src->bssht.bd_rt2rt_long_slot_time;
2447         dst->broadcom_cap_exist = src->broadcom_cap_exist;
2448         dst->ralink_cap_exist = src->ralink_cap_exist;
2449         dst->atheros_cap_exist = src->atheros_cap_exist;
2450         dst->realtek_cap_exit = src->realtek_cap_exit;
2451         dst->marvell_cap_exist = src->marvell_cap_exist;
2452         dst->cisco_cap_exist = src->cisco_cap_exist;
2453         dst->airgo_cap_exist = src->airgo_cap_exist;
2454         dst->unknown_cap_exist = src->unknown_cap_exist;
2455         memcpy(dst->wpa_ie, src->wpa_ie, src->wpa_ie_len);
2456         dst->wpa_ie_len = src->wpa_ie_len;
2457         memcpy(dst->rsn_ie, src->rsn_ie, src->rsn_ie_len);
2458         dst->rsn_ie_len = src->rsn_ie_len;
2459         memcpy(dst->wzc_ie, src->wzc_ie, src->wzc_ie_len);
2460         dst->wzc_ie_len = src->wzc_ie_len;
2461
2462         dst->last_scanned = jiffies;
2463         /* qos related parameters */
2464         qos_active = dst->qos_data.active;
2465         old_param = dst->qos_data.param_count;
2466         dst->qos_data.supported = src->qos_data.supported;
2467         if (dst->flags & NETWORK_HAS_QOS_PARAMETERS)
2468                 memcpy(&dst->qos_data, &src->qos_data,
2469                        sizeof(struct rtllib_qos_data));
2470         if (dst->qos_data.supported == 1) {
2471                 if (dst->ssid_len)
2472                         netdev_dbg(ieee->dev,
2473                                    "QoS the network %s is QoS supported\n",
2474                                    dst->ssid);
2475                 else
2476                         netdev_dbg(ieee->dev,
2477                                    "QoS the network is QoS supported\n");
2478         }
2479         dst->qos_data.active = qos_active;
2480         dst->qos_data.old_param_count = old_param;
2481
2482         dst->wmm_info = src->wmm_info;
2483         if (src->wmm_param[0].ac_aci_acm_aifsn ||
2484            src->wmm_param[1].ac_aci_acm_aifsn ||
2485            src->wmm_param[2].ac_aci_acm_aifsn ||
2486            src->wmm_param[3].ac_aci_acm_aifsn)
2487                 memcpy(dst->wmm_param, src->wmm_param, WME_AC_PRAM_LEN);
2488
2489         dst->SignalStrength = src->SignalStrength;
2490         dst->RSSI = src->RSSI;
2491         dst->Turbo_Enable = src->Turbo_Enable;
2492
2493         dst->CountryIeLen = src->CountryIeLen;
2494         memcpy(dst->CountryIeBuf, src->CountryIeBuf, src->CountryIeLen);
2495
2496         dst->bWithAironetIE = src->bWithAironetIE;
2497         dst->bCkipSupported = src->bCkipSupported;
2498         memcpy(dst->CcxRmState, src->CcxRmState, 2);
2499         dst->bCcxRmEnable = src->bCcxRmEnable;
2500         dst->MBssidMask = src->MBssidMask;
2501         dst->bMBssidValid = src->bMBssidValid;
2502         memcpy(dst->MBssid, src->MBssid, 6);
2503         dst->bWithCcxVerNum = src->bWithCcxVerNum;
2504         dst->BssCcxVerNumber = src->BssCcxVerNumber;
2505 }
2506
2507 static inline int is_beacon(u16 fc)
2508 {
2509         return (WLAN_FC_GET_STYPE(fc) == RTLLIB_STYPE_BEACON);
2510 }
2511
2512 static int IsPassiveChannel(struct rtllib_device *rtllib, u8 channel)
2513 {
2514         if (channel > MAX_CHANNEL_NUMBER) {
2515                 netdev_info(rtllib->dev, "%s(): Invalid Channel\n", __func__);
2516                 return 0;
2517         }
2518
2519         if (rtllib->active_channel_map[channel] == 2)
2520                 return 1;
2521
2522         return 0;
2523 }
2524
2525 int rtllib_legal_channel(struct rtllib_device *rtllib, u8 channel)
2526 {
2527         if (channel > MAX_CHANNEL_NUMBER) {
2528                 netdev_info(rtllib->dev, "%s(): Invalid Channel\n", __func__);
2529                 return 0;
2530         }
2531         if (rtllib->active_channel_map[channel] > 0)
2532                 return 1;
2533
2534         return 0;
2535 }
2536 EXPORT_SYMBOL(rtllib_legal_channel);
2537
2538 static inline void rtllib_process_probe_response(
2539         struct rtllib_device *ieee,
2540         struct rtllib_probe_response *beacon,
2541         struct rtllib_rx_stats *stats)
2542 {
2543         struct rtllib_network *target;
2544         struct rtllib_network *oldest = NULL;
2545         struct rtllib_info_element *info_element = &beacon->info_element[0];
2546         unsigned long flags;
2547         short renew;
2548         struct rtllib_network *network = kzalloc(sizeof(struct rtllib_network),
2549                                                  GFP_ATOMIC);
2550         u16 frame_ctl = le16_to_cpu(beacon->header.frame_ctl);
2551
2552         if (!network)
2553                 return;
2554
2555         netdev_dbg(ieee->dev,
2556                    "'%s' ( %pM ): %c%c%c%c %c%c%c%c-%c%c%c%c %c%c%c%c\n",
2557                    escape_essid(info_element->data, info_element->len),
2558                    beacon->header.addr3,
2559                    (le16_to_cpu(beacon->capability) & (1<<0xf)) ? '1' : '0',
2560                    (le16_to_cpu(beacon->capability) & (1<<0xe)) ? '1' : '0',
2561                    (le16_to_cpu(beacon->capability) & (1<<0xd)) ? '1' : '0',
2562                    (le16_to_cpu(beacon->capability) & (1<<0xc)) ? '1' : '0',
2563                    (le16_to_cpu(beacon->capability) & (1<<0xb)) ? '1' : '0',
2564                    (le16_to_cpu(beacon->capability) & (1<<0xa)) ? '1' : '0',
2565                    (le16_to_cpu(beacon->capability) & (1<<0x9)) ? '1' : '0',
2566                    (le16_to_cpu(beacon->capability) & (1<<0x8)) ? '1' : '0',
2567                    (le16_to_cpu(beacon->capability) & (1<<0x7)) ? '1' : '0',
2568                    (le16_to_cpu(beacon->capability) & (1<<0x6)) ? '1' : '0',
2569                    (le16_to_cpu(beacon->capability) & (1<<0x5)) ? '1' : '0',
2570                    (le16_to_cpu(beacon->capability) & (1<<0x4)) ? '1' : '0',
2571                    (le16_to_cpu(beacon->capability) & (1<<0x3)) ? '1' : '0',
2572                    (le16_to_cpu(beacon->capability) & (1<<0x2)) ? '1' : '0',
2573                    (le16_to_cpu(beacon->capability) & (1<<0x1)) ? '1' : '0',
2574                    (le16_to_cpu(beacon->capability) & (1<<0x0)) ? '1' : '0');
2575
2576         if (rtllib_network_init(ieee, beacon, network, stats)) {
2577                 netdev_dbg(ieee->dev, "Dropped '%s' ( %pM) via %s.\n",
2578                            escape_essid(info_element->data, info_element->len),
2579                            beacon->header.addr3,
2580                            is_beacon(frame_ctl) ? "BEACON" : "PROBE RESPONSE");
2581                 goto free_network;
2582         }
2583
2584
2585         if (!rtllib_legal_channel(ieee, network->channel))
2586                 goto free_network;
2587
2588         if (WLAN_FC_GET_STYPE(frame_ctl) == RTLLIB_STYPE_PROBE_RESP) {
2589                 if (IsPassiveChannel(ieee, network->channel)) {
2590                         netdev_info(ieee->dev,
2591                                     "GetScanInfo(): For Global Domain, filter probe response at channel(%d).\n",
2592                                     network->channel);
2593                         goto free_network;
2594                 }
2595         }
2596
2597         /* The network parsed correctly -- so now we scan our known networks
2598          * to see if we can find it in our list.
2599          *
2600          * NOTE:  This search is definitely not optimized.  Once its doing
2601          *      the "right thing" we'll optimize it for efficiency if
2602          *      necessary
2603          */
2604
2605         /* Search for this entry in the list and update it if it is
2606          * already there.
2607          */
2608
2609         spin_lock_irqsave(&ieee->lock, flags);
2610         if (is_same_network(&ieee->current_network, network,
2611            (network->ssid_len ? 1 : 0))) {
2612                 update_network(ieee, &ieee->current_network, network);
2613                 if ((ieee->current_network.mode == IEEE_N_24G ||
2614                      ieee->current_network.mode == IEEE_G) &&
2615                     ieee->current_network.berp_info_valid) {
2616                         if (ieee->current_network.erp_value & ERP_UseProtection)
2617                                 ieee->current_network.buseprotection = true;
2618                         else
2619                                 ieee->current_network.buseprotection = false;
2620                 }
2621                 if (is_beacon(frame_ctl)) {
2622                         if (ieee->state >= RTLLIB_LINKED)
2623                                 ieee->LinkDetectInfo.NumRecvBcnInPeriod++;
2624                 }
2625         }
2626         list_for_each_entry(target, &ieee->network_list, list) {
2627                 if (is_same_network(target, network,
2628                    (target->ssid_len ? 1 : 0)))
2629                         break;
2630                 if ((oldest == NULL) ||
2631                     (target->last_scanned < oldest->last_scanned))
2632                         oldest = target;
2633         }
2634
2635         /* If we didn't find a match, then get a new network slot to initialize
2636          * with this beacon's information
2637          */
2638         if (&target->list == &ieee->network_list) {
2639                 if (list_empty(&ieee->network_free_list)) {
2640                         /* If there are no more slots, expire the oldest */
2641                         list_del(&oldest->list);
2642                         target = oldest;
2643                         netdev_dbg(ieee->dev,
2644                                    "Expired '%s' ( %pM) from network list.\n",
2645                                    escape_essid(target->ssid, target->ssid_len),
2646                                    target->bssid);
2647                 } else {
2648                         /* Otherwise just pull from the free list */
2649                         target = list_entry(ieee->network_free_list.next,
2650                                             struct rtllib_network, list);
2651                         list_del(ieee->network_free_list.next);
2652                 }
2653
2654                 netdev_dbg(ieee->dev, "Adding '%s' ( %pM) via %s.\n",
2655                            escape_essid(network->ssid, network->ssid_len),
2656                            network->bssid,
2657                            is_beacon(frame_ctl) ? "BEACON" : "PROBE RESPONSE");
2658
2659                 memcpy(target, network, sizeof(*target));
2660                 list_add_tail(&target->list, &ieee->network_list);
2661                 if (ieee->softmac_features & IEEE_SOFTMAC_ASSOCIATE)
2662                         rtllib_softmac_new_net(ieee, network);
2663         } else {
2664                 netdev_dbg(ieee->dev, "Updating '%s' ( %pM) via %s.\n",
2665                            escape_essid(target->ssid, target->ssid_len),
2666                            target->bssid,
2667                            is_beacon(frame_ctl) ? "BEACON" : "PROBE RESPONSE");
2668
2669                 /* we have an entry and we are going to update it. But this
2670                  *  entry may be already expired. In this case we do the same
2671                  * as we found a new net and call the new_net handler
2672                  */
2673                 renew = !time_after(target->last_scanned + ieee->scan_age,
2674                                     jiffies);
2675                 if ((!target->ssid_len) &&
2676                     (((network->ssid_len > 0) && (target->hidden_ssid_len == 0))
2677                     || ((ieee->current_network.ssid_len == network->ssid_len) &&
2678                     (strncmp(ieee->current_network.ssid, network->ssid,
2679                     network->ssid_len) == 0) &&
2680                     (ieee->state == RTLLIB_NOLINK))))
2681                         renew = 1;
2682                 update_network(ieee, target, network);
2683                 if (renew && (ieee->softmac_features & IEEE_SOFTMAC_ASSOCIATE))
2684                         rtllib_softmac_new_net(ieee, network);
2685         }
2686
2687         spin_unlock_irqrestore(&ieee->lock, flags);
2688         if (is_beacon(frame_ctl) &&
2689             is_same_network(&ieee->current_network, network,
2690             (network->ssid_len ? 1 : 0)) &&
2691             (ieee->state == RTLLIB_LINKED)) {
2692                 if (ieee->handle_beacon != NULL)
2693                         ieee->handle_beacon(ieee->dev, beacon,
2694                                             &ieee->current_network);
2695         }
2696 free_network:
2697         kfree(network);
2698 }
2699
2700 static void rtllib_rx_mgt(struct rtllib_device *ieee,
2701                           struct sk_buff *skb,
2702                           struct rtllib_rx_stats *stats)
2703 {
2704         struct rtllib_hdr_4addr *header = (struct rtllib_hdr_4addr *)skb->data;
2705
2706         if ((WLAN_FC_GET_STYPE(le16_to_cpu(header->frame_ctl)) !=
2707             RTLLIB_STYPE_PROBE_RESP) &&
2708             (WLAN_FC_GET_STYPE(le16_to_cpu(header->frame_ctl)) !=
2709             RTLLIB_STYPE_BEACON))
2710                 ieee->last_rx_ps_time = jiffies;
2711
2712         switch (WLAN_FC_GET_STYPE(le16_to_cpu(header->frame_ctl))) {
2713
2714         case RTLLIB_STYPE_BEACON:
2715                 netdev_dbg(ieee->dev, "received BEACON (%d)\n",
2716                            WLAN_FC_GET_STYPE(le16_to_cpu(header->frame_ctl)));
2717                 rtllib_process_probe_response(
2718                                 ieee, (struct rtllib_probe_response *)header,
2719                                 stats);
2720
2721                 if (ieee->sta_sleep || (ieee->ps != RTLLIB_PS_DISABLED &&
2722                     ieee->iw_mode == IW_MODE_INFRA &&
2723                     ieee->state == RTLLIB_LINKED))
2724                         tasklet_schedule(&ieee->ps_task);
2725
2726                 break;
2727
2728         case RTLLIB_STYPE_PROBE_RESP:
2729                 netdev_dbg(ieee->dev, "received PROBE RESPONSE (%d)\n",
2730                            WLAN_FC_GET_STYPE(le16_to_cpu(header->frame_ctl)));
2731                 rtllib_process_probe_response(ieee,
2732                               (struct rtllib_probe_response *)header, stats);
2733                 break;
2734         case RTLLIB_STYPE_PROBE_REQ:
2735                 netdev_dbg(ieee->dev, "received PROBE REQUEST (%d)\n",
2736                            WLAN_FC_GET_STYPE(le16_to_cpu(header->frame_ctl)));
2737                 if ((ieee->softmac_features & IEEE_SOFTMAC_PROBERS) &&
2738                     ((ieee->iw_mode == IW_MODE_ADHOC ||
2739                     ieee->iw_mode == IW_MODE_MASTER) &&
2740                     ieee->state == RTLLIB_LINKED))
2741                         rtllib_rx_probe_rq(ieee, skb);
2742                 break;
2743         }
2744 }