Root/drivers/staging/rtl8192e/rtllib_rx.c

1/*
2 * Original code based Host AP (software wireless LAN access point) driver
3 * for Intersil Prism2/2.5/3 - hostap.o module, common routines
4 *
5 * Copyright (c) 2001-2002, SSH Communications Security Corp and Jouni Malinen
6 * <jkmaline@cc.hut.fi>
7 * Copyright (c) 2002-2003, Jouni Malinen <jkmaline@cc.hut.fi>
8 * Copyright (c) 2004, Intel Corporation
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License version 2 as
12 * published by the Free Software Foundation. See README and COPYING for
13 * more details.
14 ******************************************************************************
15
16  Few modifications for Realtek's Wi-Fi drivers by
17  Andrea Merello <andreamrl@tiscali.it>
18
19  A special thanks goes to Realtek for their support !
20
21******************************************************************************/
22
23
24#include <linux/compiler.h>
25#include <linux/errno.h>
26#include <linux/if_arp.h>
27#include <linux/in6.h>
28#include <linux/in.h>
29#include <linux/ip.h>
30#include <linux/kernel.h>
31#include <linux/module.h>
32#include <linux/netdevice.h>
33#include <linux/pci.h>
34#include <linux/proc_fs.h>
35#include <linux/skbuff.h>
36#include <linux/slab.h>
37#include <linux/tcp.h>
38#include <linux/types.h>
39#include <linux/wireless.h>
40#include <linux/etherdevice.h>
41#include <linux/uaccess.h>
42#include <linux/ctype.h>
43
44#include "rtllib.h"
45#include "dot11d.h"
46
47static inline void rtllib_monitor_rx(struct rtllib_device *ieee,
48                struct sk_buff *skb, struct rtllib_rx_stats *rx_status,
49                size_t hdr_length)
50{
51    skb->dev = ieee->dev;
52    skb_reset_mac_header(skb);
53    skb_pull(skb, hdr_length);
54    skb->pkt_type = PACKET_OTHERHOST;
55    skb->protocol = __constant_htons(ETH_P_80211_RAW);
56    memset(skb->cb, 0, sizeof(skb->cb));
57    netif_rx(skb);
58}
59
60/* Called only as a tasklet (software IRQ) */
61static struct rtllib_frag_entry *
62rtllib_frag_cache_find(struct rtllib_device *ieee, unsigned int seq,
63              unsigned int frag, u8 tid, u8 *src, u8 *dst)
64{
65    struct rtllib_frag_entry *entry;
66    int i;
67
68    for (i = 0; i < RTLLIB_FRAG_CACHE_LEN; i++) {
69        entry = &ieee->frag_cache[tid][i];
70        if (entry->skb != NULL &&
71            time_after(jiffies, entry->first_frag_time + 2 * HZ)) {
72            RTLLIB_DEBUG_FRAG(
73                "expiring fragment cache entry "
74                "seq=%u last_frag=%u\n",
75                entry->seq, entry->last_frag);
76            dev_kfree_skb_any(entry->skb);
77            entry->skb = NULL;
78        }
79
80        if (entry->skb != NULL && entry->seq == seq &&
81            (entry->last_frag + 1 == frag || frag == -1) &&
82            memcmp(entry->src_addr, src, ETH_ALEN) == 0 &&
83            memcmp(entry->dst_addr, dst, ETH_ALEN) == 0)
84            return entry;
85    }
86
87    return NULL;
88}
89
90/* Called only as a tasklet (software IRQ) */
91static struct sk_buff *
92rtllib_frag_cache_get(struct rtllib_device *ieee,
93             struct rtllib_hdr_4addr *hdr)
94{
95    struct sk_buff *skb = NULL;
96    u16 fc = le16_to_cpu(hdr->frame_ctl);
97    u16 sc = le16_to_cpu(hdr->seq_ctl);
98    unsigned int frag = WLAN_GET_SEQ_FRAG(sc);
99    unsigned int seq = WLAN_GET_SEQ_SEQ(sc);
100    struct rtllib_frag_entry *entry;
101    struct rtllib_hdr_3addrqos *hdr_3addrqos;
102    struct rtllib_hdr_4addrqos *hdr_4addrqos;
103    u8 tid;
104
105    if (((fc & RTLLIB_FCTL_DSTODS) == RTLLIB_FCTL_DSTODS) && RTLLIB_QOS_HAS_SEQ(fc)) {
106        hdr_4addrqos = (struct rtllib_hdr_4addrqos *)hdr;
107        tid = le16_to_cpu(hdr_4addrqos->qos_ctl) & RTLLIB_QCTL_TID;
108        tid = UP2AC(tid);
109        tid++;
110    } else if (RTLLIB_QOS_HAS_SEQ(fc)) {
111        hdr_3addrqos = (struct rtllib_hdr_3addrqos *)hdr;
112        tid = le16_to_cpu(hdr_3addrqos->qos_ctl) & RTLLIB_QCTL_TID;
113        tid = UP2AC(tid);
114        tid++;
115    } else {
116        tid = 0;
117    }
118
119    if (frag == 0) {
120        /* Reserve enough space to fit maximum frame length */
121        skb = dev_alloc_skb(ieee->dev->mtu +
122                    sizeof(struct rtllib_hdr_4addr) +
123                    8 /* LLC */ +
124                    2 /* alignment */ +
125                    8 /* WEP */ +
126                    ETH_ALEN /* WDS */ +
127                    (RTLLIB_QOS_HAS_SEQ(fc) ? 2 : 0) /* QOS Control */);
128        if (skb == NULL)
129            return NULL;
130
131        entry = &ieee->frag_cache[tid][ieee->frag_next_idx[tid]];
132        ieee->frag_next_idx[tid]++;
133        if (ieee->frag_next_idx[tid] >= RTLLIB_FRAG_CACHE_LEN)
134            ieee->frag_next_idx[tid] = 0;
135
136        if (entry->skb != NULL)
137            dev_kfree_skb_any(entry->skb);
138
139        entry->first_frag_time = jiffies;
140        entry->seq = seq;
141        entry->last_frag = frag;
142        entry->skb = skb;
143        memcpy(entry->src_addr, hdr->addr2, ETH_ALEN);
144        memcpy(entry->dst_addr, hdr->addr1, ETH_ALEN);
145    } else {
146        /* received a fragment of a frame for which the head fragment
147         * should have already been received */
148        entry = rtllib_frag_cache_find(ieee, seq, frag, tid, hdr->addr2,
149                          hdr->addr1);
150        if (entry != NULL) {
151            entry->last_frag = frag;
152            skb = entry->skb;
153        }
154    }
155
156    return skb;
157}
158
159
160/* Called only as a tasklet (software IRQ) */
161static int rtllib_frag_cache_invalidate(struct rtllib_device *ieee,
162                       struct rtllib_hdr_4addr *hdr)
163{
164    u16 fc = le16_to_cpu(hdr->frame_ctl);
165    u16 sc = le16_to_cpu(hdr->seq_ctl);
166    unsigned int seq = WLAN_GET_SEQ_SEQ(sc);
167    struct rtllib_frag_entry *entry;
168    struct rtllib_hdr_3addrqos *hdr_3addrqos;
169    struct rtllib_hdr_4addrqos *hdr_4addrqos;
170    u8 tid;
171
172    if (((fc & RTLLIB_FCTL_DSTODS) == RTLLIB_FCTL_DSTODS) && RTLLIB_QOS_HAS_SEQ(fc)) {
173        hdr_4addrqos = (struct rtllib_hdr_4addrqos *)hdr;
174        tid = le16_to_cpu(hdr_4addrqos->qos_ctl) & RTLLIB_QCTL_TID;
175        tid = UP2AC(tid);
176        tid++;
177    } else if (RTLLIB_QOS_HAS_SEQ(fc)) {
178        hdr_3addrqos = (struct rtllib_hdr_3addrqos *)hdr;
179        tid = le16_to_cpu(hdr_3addrqos->qos_ctl) & RTLLIB_QCTL_TID;
180        tid = UP2AC(tid);
181        tid++;
182    } else {
183        tid = 0;
184    }
185
186    entry = rtllib_frag_cache_find(ieee, seq, -1, tid, hdr->addr2,
187                      hdr->addr1);
188
189    if (entry == NULL) {
190        RTLLIB_DEBUG_FRAG(
191            "could not invalidate fragment cache "
192            "entry (seq=%u)\n", seq);
193        return -1;
194    }
195
196    entry->skb = NULL;
197    return 0;
198}
199
200/* rtllib_rx_frame_mgtmt
201 *
202 * Responsible for handling management control frames
203 *
204 * Called by rtllib_rx */
205static inline int
206rtllib_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) */
231static unsigned char rfc1042_header[] = {
232    0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00
233};
234/* Bridge-Tunnel header (for EtherTypes ETH_P_AARP and ETH_P_IPX) */
235static unsigned char bridge_tunnel_header[] = {
236    0xaa, 0xaa, 0x03, 0x00, 0x00, 0xf8
237};
238/* No encapsulation header if EtherType < 0x600 (=length) */
239
240/* Called by rtllib_rx_frame_decrypt */
241static int rtllib_is_eapol_frame(struct rtllib_device *ieee,
242                    struct sk_buff *skb, size_t hdrlen)
243{
244    struct net_device *dev = ieee->dev;
245    u16 fc, ethertype;
246    struct rtllib_hdr_4addr *hdr;
247    u8 *pos;
248
249    if (skb->len < 24)
250        return 0;
251
252    hdr = (struct rtllib_hdr_4addr *) skb->data;
253    fc = le16_to_cpu(hdr->frame_ctl);
254
255    /* check that the frame is unicast frame to us */
256    if ((fc & (RTLLIB_FCTL_TODS | RTLLIB_FCTL_FROMDS)) ==
257        RTLLIB_FCTL_TODS &&
258        memcmp(hdr->addr1, dev->dev_addr, ETH_ALEN) == 0 &&
259        memcmp(hdr->addr3, dev->dev_addr, ETH_ALEN) == 0) {
260        /* ToDS frame with own addr BSSID and DA */
261    } else if ((fc & (RTLLIB_FCTL_TODS | RTLLIB_FCTL_FROMDS)) ==
262           RTLLIB_FCTL_FROMDS &&
263           memcmp(hdr->addr1, dev->dev_addr, ETH_ALEN) == 0) {
264        /* FromDS frame with own addr as DA */
265    } else
266        return 0;
267
268    if (skb->len < 24 + 8)
269        return 0;
270
271    /* check for port access entity Ethernet type */
272    pos = skb->data + hdrlen;
273    ethertype = (pos[6] << 8) | pos[7];
274    if (ethertype == ETH_P_PAE)
275        return 1;
276
277    return 0;
278}
279
280/* Called only as a tasklet (software IRQ), by rtllib_rx */
281static inline int
282rtllib_rx_frame_decrypt(struct rtllib_device *ieee, struct sk_buff *skb,
283            struct lib80211_crypt_data *crypt)
284{
285    struct rtllib_hdr_4addr *hdr;
286    int res, hdrlen;
287
288    if (crypt == NULL || crypt->ops->decrypt_mpdu == NULL)
289        return 0;
290
291    if (ieee->hwsec_active) {
292        struct cb_desc *tcb_desc = (struct cb_desc *)(skb->cb + MAX_DEV_ADDR_SIZE);
293        tcb_desc->bHwSec = 1;
294
295        if (ieee->need_sw_enc)
296            tcb_desc->bHwSec = 0;
297    }
298
299    hdr = (struct rtllib_hdr_4addr *) skb->data;
300    hdrlen = rtllib_get_hdrlen(le16_to_cpu(hdr->frame_ctl));
301
302    atomic_inc(&crypt->refcnt);
303    res = crypt->ops->decrypt_mpdu(skb, hdrlen, crypt->priv);
304    atomic_dec(&crypt->refcnt);
305    if (res < 0) {
306        RTLLIB_DEBUG_DROP(
307            "decryption failed (SA= %pM"
308            ") res=%d\n", hdr->addr2, res);
309        if (res == -2)
310            RTLLIB_DEBUG_DROP("Decryption failed ICV "
311                         "mismatch (key %d)\n",
312                         skb->data[hdrlen + 3] >> 6);
313        ieee->ieee_stats.rx_discards_undecryptable++;
314        return -1;
315    }
316
317    return res;
318}
319
320
321/* Called only as a tasklet (software IRQ), by rtllib_rx */
322static inline int
323rtllib_rx_frame_decrypt_msdu(struct rtllib_device *ieee, struct sk_buff *skb,
324                 int keyidx, struct lib80211_crypt_data *crypt)
325{
326    struct rtllib_hdr_4addr *hdr;
327    int res, hdrlen;
328
329    if (crypt == NULL || crypt->ops->decrypt_msdu == NULL)
330        return 0;
331    if (ieee->hwsec_active) {
332        struct cb_desc *tcb_desc = (struct cb_desc *)(skb->cb + MAX_DEV_ADDR_SIZE);
333        tcb_desc->bHwSec = 1;
334
335        if (ieee->need_sw_enc)
336            tcb_desc->bHwSec = 0;
337    }
338
339    hdr = (struct rtllib_hdr_4addr *) skb->data;
340    hdrlen = rtllib_get_hdrlen(le16_to_cpu(hdr->frame_ctl));
341
342    atomic_inc(&crypt->refcnt);
343    res = crypt->ops->decrypt_msdu(skb, keyidx, hdrlen, crypt->priv);
344    atomic_dec(&crypt->refcnt);
345    if (res < 0) {
346        printk(KERN_DEBUG "%s: MSDU decryption/MIC verification failed"
347               " (SA= %pM keyidx=%d)\n",
348               ieee->dev->name, hdr->addr2, keyidx);
349        return -1;
350    }
351
352    return 0;
353}
354
355
356/* this function is stolen from ipw2200 driver*/
357#define IEEE_PACKET_RETRY_TIME (5*HZ)
358static int is_duplicate_packet(struct rtllib_device *ieee,
359                      struct rtllib_hdr_4addr *header)
360{
361    u16 fc = le16_to_cpu(header->frame_ctl);
362    u16 sc = le16_to_cpu(header->seq_ctl);
363    u16 seq = WLAN_GET_SEQ_SEQ(sc);
364    u16 frag = WLAN_GET_SEQ_FRAG(sc);
365    u16 *last_seq, *last_frag;
366    unsigned long *last_time;
367    struct rtllib_hdr_3addrqos *hdr_3addrqos;
368    struct rtllib_hdr_4addrqos *hdr_4addrqos;
369    u8 tid;
370
371    if (((fc & RTLLIB_FCTL_DSTODS) == RTLLIB_FCTL_DSTODS) && RTLLIB_QOS_HAS_SEQ(fc)) {
372        hdr_4addrqos = (struct rtllib_hdr_4addrqos *)header;
373        tid = le16_to_cpu(hdr_4addrqos->qos_ctl) & RTLLIB_QCTL_TID;
374        tid = UP2AC(tid);
375        tid++;
376    } else if (RTLLIB_QOS_HAS_SEQ(fc)) {
377        hdr_3addrqos = (struct rtllib_hdr_3addrqos *)header;
378        tid = le16_to_cpu(hdr_3addrqos->qos_ctl) & RTLLIB_QCTL_TID;
379        tid = UP2AC(tid);
380        tid++;
381    } else {
382        tid = 0;
383    }
384
385    switch (ieee->iw_mode) {
386    case IW_MODE_ADHOC:
387    {
388        struct list_head *p;
389        struct ieee_ibss_seq *entry = NULL;
390        u8 *mac = header->addr2;
391        int index = mac[5] % IEEE_IBSS_MAC_HASH_SIZE;
392        list_for_each(p, &ieee->ibss_mac_hash[index]) {
393            entry = list_entry(p, struct ieee_ibss_seq, list);
394            if (!memcmp(entry->mac, mac, ETH_ALEN))
395                break;
396        }
397        if (p == &ieee->ibss_mac_hash[index]) {
398            entry = kmalloc(sizeof(struct ieee_ibss_seq), GFP_ATOMIC);
399            if (!entry) {
400                printk(KERN_WARNING "Cannot malloc new mac entry\n");
401                return 0;
402            }
403            memcpy(entry->mac, mac, ETH_ALEN);
404            entry->seq_num[tid] = seq;
405            entry->frag_num[tid] = frag;
406            entry->packet_time[tid] = jiffies;
407            list_add(&entry->list, &ieee->ibss_mac_hash[index]);
408            return 0;
409        }
410        last_seq = &entry->seq_num[tid];
411        last_frag = &entry->frag_num[tid];
412        last_time = &entry->packet_time[tid];
413        break;
414    }
415
416    case IW_MODE_INFRA:
417        last_seq = &ieee->last_rxseq_num[tid];
418        last_frag = &ieee->last_rxfrag_num[tid];
419        last_time = &ieee->last_packet_time[tid];
420        break;
421    default:
422        return 0;
423    }
424
425    if ((*last_seq == seq) &&
426        time_after(*last_time + IEEE_PACKET_RETRY_TIME, jiffies)) {
427        if (*last_frag == frag)
428            goto drop;
429        if (*last_frag + 1 != frag)
430            /* out-of-order fragment */
431            goto drop;
432    } else
433        *last_seq = seq;
434
435    *last_frag = frag;
436    *last_time = jiffies;
437    return 0;
438
439drop:
440
441    return 1;
442}
443
444static bool AddReorderEntry(struct rx_ts_record *pTS,
445                struct rx_reorder_entry *pReorderEntry)
446{
447    struct list_head *pList = &pTS->RxPendingPktList;
448
449    while (pList->next != &pTS->RxPendingPktList) {
450        if (SN_LESS(pReorderEntry->SeqNum, ((struct rx_reorder_entry *)
451            list_entry(pList->next, struct rx_reorder_entry,
452            List))->SeqNum))
453            pList = pList->next;
454        else if (SN_EQUAL(pReorderEntry->SeqNum,
455            ((struct rx_reorder_entry *)list_entry(pList->next,
456            struct rx_reorder_entry, List))->SeqNum))
457                return false;
458        else
459            break;
460    }
461    pReorderEntry->List.next = pList->next;
462    pReorderEntry->List.next->prev = &pReorderEntry->List;
463    pReorderEntry->List.prev = pList;
464    pList->next = &pReorderEntry->List;
465
466    return true;
467}
468
469void rtllib_indicate_packets(struct rtllib_device *ieee, struct rtllib_rxb **prxbIndicateArray, u8 index)
470{
471    struct net_device_stats *stats = &ieee->stats;
472    u8 i = 0 , j = 0;
473    u16 ethertype;
474    for (j = 0; j < index; j++) {
475        struct rtllib_rxb *prxb = prxbIndicateArray[j];
476        for (i = 0; i < prxb->nr_subframes; i++) {
477            struct sk_buff *sub_skb = prxb->subframes[i];
478
479        /* convert hdr + possible LLC headers into Ethernet header */
480            ethertype = (sub_skb->data[6] << 8) | sub_skb->data[7];
481            if (sub_skb->len >= 8 &&
482                ((memcmp(sub_skb->data, rfc1042_header, SNAP_SIZE) == 0 &&
483                ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
484                memcmp(sub_skb->data, bridge_tunnel_header, SNAP_SIZE) == 0)) {
485                /* remove RFC1042 or Bridge-Tunnel encapsulation
486                 * and replace EtherType */
487                skb_pull(sub_skb, SNAP_SIZE);
488                memcpy(skb_push(sub_skb, ETH_ALEN), prxb->src, ETH_ALEN);
489                memcpy(skb_push(sub_skb, ETH_ALEN), prxb->dst, ETH_ALEN);
490            } else {
491                u16 len;
492            /* Leave Ethernet header part of hdr and full payload */
493                len = htons(sub_skb->len);
494                memcpy(skb_push(sub_skb, 2), &len, 2);
495                memcpy(skb_push(sub_skb, ETH_ALEN), prxb->src, ETH_ALEN);
496                memcpy(skb_push(sub_skb, ETH_ALEN), prxb->dst, ETH_ALEN);
497            }
498
499            /* Indicate the packets to upper layer */
500            if (sub_skb) {
501                stats->rx_packets++;
502                stats->rx_bytes += sub_skb->len;
503
504                memset(sub_skb->cb, 0, sizeof(sub_skb->cb));
505                sub_skb->protocol = eth_type_trans(sub_skb, ieee->dev);
506                sub_skb->dev = ieee->dev;
507                sub_skb->dev->stats.rx_packets++;
508                sub_skb->dev->stats.rx_bytes += sub_skb->len;
509                sub_skb->ip_summed = CHECKSUM_NONE; /* 802.11 crc not sufficient */
510                ieee->last_rx_ps_time = jiffies;
511                netif_rx(sub_skb);
512            }
513        }
514        kfree(prxb);
515        prxb = NULL;
516    }
517}
518
519void rtllib_FlushRxTsPendingPkts(struct rtllib_device *ieee, struct rx_ts_record *pTS)
520{
521    struct rx_reorder_entry *pRxReorderEntry;
522    u8 RfdCnt = 0;
523
524    del_timer_sync(&pTS->RxPktPendingTimer);
525    while (!list_empty(&pTS->RxPendingPktList)) {
526        if (RfdCnt >= REORDER_WIN_SIZE) {
527            printk(KERN_INFO "-------------->%s() error! RfdCnt >= REORDER_WIN_SIZE\n", __func__);
528            break;
529        }
530
531        pRxReorderEntry = (struct rx_reorder_entry *)list_entry(pTS->RxPendingPktList.prev, struct rx_reorder_entry, List);
532        RTLLIB_DEBUG(RTLLIB_DL_REORDER, "%s(): Indicate SeqNum %d!\n", __func__, pRxReorderEntry->SeqNum);
533        list_del_init(&pRxReorderEntry->List);
534
535        ieee->RfdArray[RfdCnt] = pRxReorderEntry->prxb;
536
537        RfdCnt = RfdCnt + 1;
538        list_add_tail(&pRxReorderEntry->List, &ieee->RxReorder_Unused_List);
539    }
540    rtllib_indicate_packets(ieee, ieee->RfdArray, RfdCnt);
541
542    pTS->RxIndicateSeq = 0xffff;
543}
544
545static void RxReorderIndicatePacket(struct rtllib_device *ieee,
546                    struct rtllib_rxb *prxb,
547                    struct rx_ts_record *pTS, u16 SeqNum)
548{
549    struct rt_hi_throughput *pHTInfo = ieee->pHTInfo;
550    struct rx_reorder_entry *pReorderEntry = NULL;
551    u8 WinSize = pHTInfo->RxReorderWinSize;
552    u16 WinEnd = 0;
553    u8 index = 0;
554    bool bMatchWinStart = false, bPktInBuf = false;
555    unsigned long flags;
556
557    RTLLIB_DEBUG(RTLLIB_DL_REORDER, "%s(): Seq is %d, pTS->RxIndicateSeq"
558             " is %d, WinSize is %d\n", __func__, SeqNum,
559             pTS->RxIndicateSeq, WinSize);
560
561    spin_lock_irqsave(&(ieee->reorder_spinlock), flags);
562
563    WinEnd = (pTS->RxIndicateSeq + WinSize - 1) % 4096;
564    /* Rx Reorder initialize condition.*/
565    if (pTS->RxIndicateSeq == 0xffff)
566        pTS->RxIndicateSeq = SeqNum;
567
568    /* Drop out the packet which SeqNum is smaller than WinStart */
569    if (SN_LESS(SeqNum, pTS->RxIndicateSeq)) {
570        RTLLIB_DEBUG(RTLLIB_DL_REORDER, "Packet Drop! IndicateSeq: %d, NewSeq: %d\n",
571                 pTS->RxIndicateSeq, SeqNum);
572        pHTInfo->RxReorderDropCounter++;
573        {
574            int i;
575            for (i = 0; i < prxb->nr_subframes; i++)
576                dev_kfree_skb(prxb->subframes[i]);
577            kfree(prxb);
578            prxb = NULL;
579        }
580        spin_unlock_irqrestore(&(ieee->reorder_spinlock), flags);
581        return;
582    }
583
584    /*
585     * Sliding window manipulation. Conditions includes:
586     * 1. Incoming SeqNum is equal to WinStart =>Window shift 1
587     * 2. Incoming SeqNum is larger than the WinEnd => Window shift N
588     */
589    if (SN_EQUAL(SeqNum, pTS->RxIndicateSeq)) {
590        pTS->RxIndicateSeq = (pTS->RxIndicateSeq + 1) % 4096;
591        bMatchWinStart = true;
592    } else if (SN_LESS(WinEnd, SeqNum)) {
593        if (SeqNum >= (WinSize - 1))
594            pTS->RxIndicateSeq = SeqNum + 1 - WinSize;
595        else
596            pTS->RxIndicateSeq = 4095 - (WinSize - (SeqNum + 1)) + 1;
597        RTLLIB_DEBUG(RTLLIB_DL_REORDER, "Window Shift! IndicateSeq: %d,"
598                 " NewSeq: %d\n", pTS->RxIndicateSeq, SeqNum);
599    }
600
601    /*
602     * Indication process.
603     * After Packet dropping and Sliding Window shifting as above, we can
604     * now just indicate the packets with the SeqNum smaller than latest
605     * WinStart and struct buffer other packets.
606     */
607    /* For Rx Reorder condition:
608     * 1. All packets with SeqNum smaller than WinStart => Indicate
609     * 2. All packets with SeqNum larger than or equal to
610     * WinStart => Buffer it.
611     */
612    if (bMatchWinStart) {
613        /* Current packet is going to be indicated.*/
614        RTLLIB_DEBUG(RTLLIB_DL_REORDER, "Packets indication!! "
615                "IndicateSeq: %d, NewSeq: %d\n",
616                pTS->RxIndicateSeq, SeqNum);
617        ieee->prxbIndicateArray[0] = prxb;
618        index = 1;
619    } else {
620        /* Current packet is going to be inserted into pending list.*/
621        if (!list_empty(&ieee->RxReorder_Unused_List)) {
622            pReorderEntry = (struct rx_reorder_entry *)
623                    list_entry(ieee->RxReorder_Unused_List.next,
624                    struct rx_reorder_entry, List);
625            list_del_init(&pReorderEntry->List);
626
627            /* Make a reorder entry and insert into a the packet list.*/
628            pReorderEntry->SeqNum = SeqNum;
629            pReorderEntry->prxb = prxb;
630
631            if (!AddReorderEntry(pTS, pReorderEntry)) {
632                RTLLIB_DEBUG(RTLLIB_DL_REORDER,
633                         "%s(): Duplicate packet is "
634                         "dropped!! IndicateSeq: %d, "
635                         "NewSeq: %d\n",
636                        __func__, pTS->RxIndicateSeq,
637                        SeqNum);
638                list_add_tail(&pReorderEntry->List,
639                          &ieee->RxReorder_Unused_List); {
640                    int i;
641                    for (i = 0; i < prxb->nr_subframes; i++)
642                        dev_kfree_skb(prxb->subframes[i]);
643                    kfree(prxb);
644                    prxb = NULL;
645                }
646            } else {
647                RTLLIB_DEBUG(RTLLIB_DL_REORDER,
648                     "Pkt insert into struct buffer!! "
649                     "IndicateSeq: %d, NewSeq: %d\n",
650                     pTS->RxIndicateSeq, SeqNum);
651            }
652        } else {
653            /*
654             * Packets are dropped if there are not enough reorder
655             * entries. This part should be modified!! We can just
656             * indicate all the packets in struct buffer and get
657             * reorder entries.
658             */
659            RTLLIB_DEBUG(RTLLIB_DL_ERR, "RxReorderIndicatePacket():"
660                     " There is no reorder entry!! Packet is "
661                     "dropped!!\n");
662            {
663                int i;
664                for (i = 0; i < prxb->nr_subframes; i++)
665                    dev_kfree_skb(prxb->subframes[i]);
666                kfree(prxb);
667                prxb = NULL;
668            }
669        }
670    }
671
672    /* Check if there is any packet need indicate.*/
673    while (!list_empty(&pTS->RxPendingPktList)) {
674        RTLLIB_DEBUG(RTLLIB_DL_REORDER, "%s(): start RREORDER indicate\n", __func__);
675
676        pReorderEntry = (struct rx_reorder_entry *)list_entry(pTS->RxPendingPktList.prev,
677                 struct rx_reorder_entry, List);
678        if (SN_LESS(pReorderEntry->SeqNum, pTS->RxIndicateSeq) ||
679                SN_EQUAL(pReorderEntry->SeqNum, pTS->RxIndicateSeq)) {
680            /* This protect struct buffer from overflow. */
681            if (index >= REORDER_WIN_SIZE) {
682                RTLLIB_DEBUG(RTLLIB_DL_ERR, "RxReorderIndicate"
683                         "Packet(): Buffer overflow!!\n");
684                bPktInBuf = true;
685                break;
686            }
687
688            list_del_init(&pReorderEntry->List);
689
690            if (SN_EQUAL(pReorderEntry->SeqNum, pTS->RxIndicateSeq))
691                pTS->RxIndicateSeq = (pTS->RxIndicateSeq + 1) % 4096;
692
693            ieee->prxbIndicateArray[index] = pReorderEntry->prxb;
694            RTLLIB_DEBUG(RTLLIB_DL_REORDER, "%s(): Indicate SeqNum"
695                     " %d!\n", __func__, pReorderEntry->SeqNum);
696            index++;
697
698            list_add_tail(&pReorderEntry->List,
699                      &ieee->RxReorder_Unused_List);
700        } else {
701            bPktInBuf = true;
702            break;
703        }
704    }
705
706    /* Handling pending timer. Set this timer to prevent from long time
707     * Rx buffering.*/
708    if (index > 0) {
709        if (timer_pending(&pTS->RxPktPendingTimer))
710            del_timer_sync(&pTS->RxPktPendingTimer);
711        pTS->RxTimeoutIndicateSeq = 0xffff;
712
713        if (index > REORDER_WIN_SIZE) {
714            RTLLIB_DEBUG(RTLLIB_DL_ERR, "RxReorderIndicatePacket():"
715                     " Rx Reorer struct buffer full!!\n");
716            spin_unlock_irqrestore(&(ieee->reorder_spinlock),
717                           flags);
718            return;
719        }
720        rtllib_indicate_packets(ieee, ieee->prxbIndicateArray, index);
721        bPktInBuf = false;
722    }
723
724    if (bPktInBuf && pTS->RxTimeoutIndicateSeq == 0xffff) {
725        RTLLIB_DEBUG(RTLLIB_DL_REORDER, "%s(): SET rx timeout timer\n",
726                 __func__);
727        pTS->RxTimeoutIndicateSeq = pTS->RxIndicateSeq;
728        mod_timer(&pTS->RxPktPendingTimer, jiffies +
729              MSECS(pHTInfo->RxReorderPendingTime));
730    }
731    spin_unlock_irqrestore(&(ieee->reorder_spinlock), flags);
732}
733
734static u8 parse_subframe(struct rtllib_device *ieee, struct sk_buff *skb,
735             struct rtllib_rx_stats *rx_stats,
736             struct rtllib_rxb *rxb, u8 *src, u8 *dst)
737{
738    struct rtllib_hdr_3addr *hdr = (struct rtllib_hdr_3addr *)skb->data;
739    u16 fc = le16_to_cpu(hdr->frame_ctl);
740
741    u16 LLCOffset = sizeof(struct rtllib_hdr_3addr);
742    u16 ChkLength;
743    bool bIsAggregateFrame = false;
744    u16 nSubframe_Length;
745    u8 nPadding_Length = 0;
746    u16 SeqNum = 0;
747    struct sk_buff *sub_skb;
748    u8 *data_ptr;
749    /* just for debug purpose */
750    SeqNum = WLAN_GET_SEQ_SEQ(le16_to_cpu(hdr->seq_ctl));
751    if ((RTLLIB_QOS_HAS_SEQ(fc)) &&
752       (((union frameqos *)(skb->data + RTLLIB_3ADDR_LEN))->field.reserved))
753        bIsAggregateFrame = true;
754
755    if (RTLLIB_QOS_HAS_SEQ(fc))
756        LLCOffset += 2;
757    if (rx_stats->bContainHTC)
758        LLCOffset += sHTCLng;
759
760    ChkLength = LLCOffset;
761
762    if (skb->len <= ChkLength)
763        return 0;
764
765    skb_pull(skb, LLCOffset);
766    ieee->bIsAggregateFrame = bIsAggregateFrame;
767    if (!bIsAggregateFrame) {
768        rxb->nr_subframes = 1;
769
770        /* altered by clark 3/30/2010
771         * The struct buffer size of the skb indicated to upper layer
772         * must be less than 5000, or the defraged IP datagram
773         * in the IP layer will exceed "ipfrag_high_tresh" and be
774         * discarded. so there must not use the function
775         * "skb_copy" and "skb_clone" for "skb".
776         */
777
778        /* Allocate new skb for releasing to upper layer */
779        sub_skb = dev_alloc_skb(RTLLIB_SKBBUFFER_SIZE);
780        skb_reserve(sub_skb, 12);
781        data_ptr = (u8 *)skb_put(sub_skb, skb->len);
782        memcpy(data_ptr, skb->data, skb->len);
783        sub_skb->dev = ieee->dev;
784
785        rxb->subframes[0] = sub_skb;
786
787        memcpy(rxb->src, src, ETH_ALEN);
788        memcpy(rxb->dst, dst, ETH_ALEN);
789        rxb->subframes[0]->dev = ieee->dev;
790        return 1;
791    } else {
792        rxb->nr_subframes = 0;
793        memcpy(rxb->src, src, ETH_ALEN);
794        memcpy(rxb->dst, dst, ETH_ALEN);
795        while (skb->len > ETHERNET_HEADER_SIZE) {
796            /* Offset 12 denote 2 mac address */
797            nSubframe_Length = *((u16 *)(skb->data + 12));
798            nSubframe_Length = (nSubframe_Length >> 8) +
799                       (nSubframe_Length << 8);
800
801            if (skb->len < (ETHERNET_HEADER_SIZE + nSubframe_Length)) {
802                printk(KERN_INFO "%s: A-MSDU parse error!! "
803                       "pRfd->nTotalSubframe : %d\n",\
804                       __func__, rxb->nr_subframes);
805                printk(KERN_INFO "%s: A-MSDU parse error!! "
806                       "Subframe Length: %d\n", __func__,
807                       nSubframe_Length);
808                printk(KERN_INFO "nRemain_Length is %d and "
809                       "nSubframe_Length is : %d\n", skb->len,
810                       nSubframe_Length);
811                printk(KERN_INFO "The Packet SeqNum is %d\n", SeqNum);
812                return 0;
813            }
814
815            /* move the data point to data content */
816            skb_pull(skb, ETHERNET_HEADER_SIZE);
817
818            /* altered by clark 3/30/2010
819             * The struct buffer size of the skb indicated to upper layer
820             * must be less than 5000, or the defraged IP datagram
821             * in the IP layer will exceed "ipfrag_high_tresh" and be
822             * discarded. so there must not use the function
823             * "skb_copy" and "skb_clone" for "skb".
824             */
825
826            /* Allocate new skb for releasing to upper layer */
827            sub_skb = dev_alloc_skb(nSubframe_Length + 12);
828            skb_reserve(sub_skb, 12);
829            data_ptr = (u8 *)skb_put(sub_skb, nSubframe_Length);
830            memcpy(data_ptr, skb->data, nSubframe_Length);
831
832            sub_skb->dev = ieee->dev;
833            rxb->subframes[rxb->nr_subframes++] = sub_skb;
834            if (rxb->nr_subframes >= MAX_SUBFRAME_COUNT) {
835                RTLLIB_DEBUG_RX("ParseSubframe(): Too many "
836                        "Subframes! Packets dropped!\n");
837                break;
838            }
839            skb_pull(skb, nSubframe_Length);
840
841            if (skb->len != 0) {
842                nPadding_Length = 4 - ((nSubframe_Length +
843                          ETHERNET_HEADER_SIZE) % 4);
844                if (nPadding_Length == 4)
845                    nPadding_Length = 0;
846
847                if (skb->len < nPadding_Length)
848                    return 0;
849
850                skb_pull(skb, nPadding_Length);
851            }
852        }
853
854        return rxb->nr_subframes;
855    }
856}
857
858
859static size_t rtllib_rx_get_hdrlen(struct rtllib_device *ieee,
860                   struct sk_buff *skb,
861                   struct rtllib_rx_stats *rx_stats)
862{
863    struct rtllib_hdr_4addr *hdr = (struct rtllib_hdr_4addr *)skb->data;
864    u16 fc = le16_to_cpu(hdr->frame_ctl);
865    size_t hdrlen = 0;
866
867    hdrlen = rtllib_get_hdrlen(fc);
868    if (HTCCheck(ieee, skb->data)) {
869        if (net_ratelimit())
870            printk(KERN_INFO "%s: find HTCControl!\n", __func__);
871        hdrlen += 4;
872        rx_stats->bContainHTC = 1;
873    }
874
875     if (RTLLIB_QOS_HAS_SEQ(fc))
876        rx_stats->bIsQosData = 1;
877
878    return hdrlen;
879}
880
881static int rtllib_rx_check_duplicate(struct rtllib_device *ieee,
882                     struct sk_buff *skb, u8 multicast)
883{
884    struct rtllib_hdr_4addr *hdr = (struct rtllib_hdr_4addr *)skb->data;
885    u16 fc, sc;
886    u8 frag, type, stype;
887
888    fc = le16_to_cpu(hdr->frame_ctl);
889    type = WLAN_FC_GET_TYPE(fc);
890    stype = WLAN_FC_GET_STYPE(fc);
891    sc = le16_to_cpu(hdr->seq_ctl);
892    frag = WLAN_GET_SEQ_FRAG(sc);
893
894    if ((ieee->pHTInfo->bCurRxReorderEnable == false) ||
895        !ieee->current_network.qos_data.active ||
896        !IsDataFrame(skb->data) ||
897        IsLegacyDataFrame(skb->data)) {
898        if (!((type == RTLLIB_FTYPE_MGMT) && (stype == RTLLIB_STYPE_BEACON))) {
899            if (is_duplicate_packet(ieee, hdr))
900                return -1;
901        }
902    } else {
903        struct rx_ts_record *pRxTS = NULL;
904        if (GetTs(ieee, (struct ts_common_info **) &pRxTS, hdr->addr2,
905            (u8)Frame_QoSTID((u8 *)(skb->data)), RX_DIR, true)) {
906            if ((fc & (1<<11)) && (frag == pRxTS->RxLastFragNum) &&
907                (WLAN_GET_SEQ_SEQ(sc) == pRxTS->RxLastSeqNum)) {
908                return -1;
909            } else {
910                pRxTS->RxLastFragNum = frag;
911                pRxTS->RxLastSeqNum = WLAN_GET_SEQ_SEQ(sc);
912            }
913        } else {
914            RTLLIB_DEBUG(RTLLIB_DL_ERR, "ERR!!%s(): No TS!! Skip"
915                     " the check!!\n", __func__);
916            return -1;
917        }
918    }
919
920    return 0;
921}
922
923static void rtllib_rx_extract_addr(struct rtllib_device *ieee,
924                   struct rtllib_hdr_4addr *hdr, u8 *dst,
925                   u8 *src, u8 *bssid)
926{
927    u16 fc = le16_to_cpu(hdr->frame_ctl);
928
929    switch (fc & (RTLLIB_FCTL_FROMDS | RTLLIB_FCTL_TODS)) {
930    case RTLLIB_FCTL_FROMDS:
931        memcpy(dst, hdr->addr1, ETH_ALEN);
932        memcpy(src, hdr->addr3, ETH_ALEN);
933        memcpy(bssid, hdr->addr2, ETH_ALEN);
934        break;
935    case RTLLIB_FCTL_TODS:
936        memcpy(dst, hdr->addr3, ETH_ALEN);
937        memcpy(src, hdr->addr2, ETH_ALEN);
938        memcpy(bssid, hdr->addr1, ETH_ALEN);
939        break;
940    case RTLLIB_FCTL_FROMDS | RTLLIB_FCTL_TODS:
941        memcpy(dst, hdr->addr3, ETH_ALEN);
942        memcpy(src, hdr->addr4, ETH_ALEN);
943        memcpy(bssid, ieee->current_network.bssid, ETH_ALEN);
944        break;
945    case 0:
946        memcpy(dst, hdr->addr1, ETH_ALEN);
947        memcpy(src, hdr->addr2, ETH_ALEN);
948        memcpy(bssid, hdr->addr3, ETH_ALEN);
949        break;
950    }
951}
952
953static int rtllib_rx_data_filter(struct rtllib_device *ieee, u16 fc,
954                 u8 *dst, u8 *src, u8 *bssid, u8 *addr2)
955{
956    u8 zero_addr[ETH_ALEN] = {0};
957    u8 type, stype;
958
959    type = WLAN_FC_GET_TYPE(fc);
960    stype = WLAN_FC_GET_STYPE(fc);
961
962    /* Filter frames from different BSS */
963    if (((fc & RTLLIB_FCTL_DSTODS) != RTLLIB_FCTL_DSTODS)
964        && (compare_ether_addr(ieee->current_network.bssid, bssid) != 0)
965        && memcmp(ieee->current_network.bssid, zero_addr, ETH_ALEN)) {
966        return -1;
967    }
968
969    /* Filter packets sent by an STA that will be forwarded by AP */
970    if (ieee->IntelPromiscuousModeInfo.bPromiscuousOn &&
971        ieee->IntelPromiscuousModeInfo.bFilterSourceStationFrame) {
972        if ((fc & RTLLIB_FCTL_TODS) && !(fc & RTLLIB_FCTL_FROMDS) &&
973            (compare_ether_addr(dst, ieee->current_network.bssid) != 0) &&
974            (compare_ether_addr(bssid, ieee->current_network.bssid) == 0)) {
975            return -1;
976        }
977    }
978
979    /* Nullfunc frames may have PS-bit set, so they must be passed to
980     * hostap_handle_sta_rx() before being dropped here. */
981    if (!ieee->IntelPromiscuousModeInfo.bPromiscuousOn) {
982        if (stype != RTLLIB_STYPE_DATA &&
983            stype != RTLLIB_STYPE_DATA_CFACK &&
984            stype != RTLLIB_STYPE_DATA_CFPOLL &&
985            stype != RTLLIB_STYPE_DATA_CFACKPOLL &&
986            stype != RTLLIB_STYPE_QOS_DATA) {
987            if (stype != RTLLIB_STYPE_NULLFUNC)
988                RTLLIB_DEBUG_DROP(
989                    "RX: dropped data frame "
990                    "with no data (type=0x%02x, "
991                    "subtype=0x%02x)\n",
992                    type, stype);
993            return -1;
994        }
995    }
996
997    if (ieee->iw_mode != IW_MODE_MESH) {
998        /* packets from our adapter are dropped (echo) */
999        if (!memcmp(src, ieee->dev->dev_addr, ETH_ALEN))
1000            return -1;
1001
1002        /* {broad,multi}cast packets to our BSS go through */
1003        if (is_multicast_ether_addr(dst)) {
1004            if (memcmp(bssid, ieee->current_network.bssid, ETH_ALEN))
1005                return -1;
1006        }
1007    }
1008    return 0;
1009}
1010
1011static int rtllib_rx_get_crypt(struct rtllib_device *ieee, struct sk_buff *skb,
1012            struct lib80211_crypt_data **crypt, size_t hdrlen)
1013{
1014    struct rtllib_hdr_4addr *hdr = (struct rtllib_hdr_4addr *)skb->data;
1015    u16 fc = le16_to_cpu(hdr->frame_ctl);
1016    int idx = 0;
1017
1018    if (ieee->host_decrypt) {
1019        if (skb->len >= hdrlen + 3)
1020            idx = skb->data[hdrlen + 3] >> 6;
1021
1022        *crypt = ieee->crypt_info.crypt[idx];
1023        /* allow NULL decrypt to indicate an station specific override
1024         * for default encryption */
1025        if (*crypt && ((*crypt)->ops == NULL ||
1026                  (*crypt)->ops->decrypt_mpdu == NULL))
1027            *crypt = NULL;
1028
1029        if (!*crypt && (fc & RTLLIB_FCTL_WEP)) {
1030            /* This seems to be triggered by some (multicast?)
1031             * frames from other than current BSS, so just drop the
1032             * frames silently instead of filling system log with
1033             * these reports. */
1034            RTLLIB_DEBUG_DROP("Decryption failed (not set)"
1035                         " (SA= %pM)\n",
1036                         hdr->addr2);
1037            ieee->ieee_stats.rx_discards_undecryptable++;
1038            return -1;
1039        }
1040    }
1041
1042    return 0;
1043}
1044
1045static int rtllib_rx_decrypt(struct rtllib_device *ieee, struct sk_buff *skb,
1046              struct rtllib_rx_stats *rx_stats,
1047              struct lib80211_crypt_data *crypt, size_t hdrlen)
1048{
1049    struct rtllib_hdr_4addr *hdr;
1050    int keyidx = 0;
1051    u16 fc, sc;
1052    u8 frag;
1053
1054    hdr = (struct rtllib_hdr_4addr *)skb->data;
1055    fc = le16_to_cpu(hdr->frame_ctl);
1056    sc = le16_to_cpu(hdr->seq_ctl);
1057    frag = WLAN_GET_SEQ_FRAG(sc);
1058
1059    if ((!rx_stats->Decrypted))
1060        ieee->need_sw_enc = 1;
1061    else
1062        ieee->need_sw_enc = 0;
1063
1064    keyidx = rtllib_rx_frame_decrypt(ieee, skb, crypt);
1065    if (ieee->host_decrypt && (fc & RTLLIB_FCTL_WEP) && (keyidx < 0)) {
1066        printk(KERN_INFO "%s: decrypt frame error\n", __func__);
1067        return -1;
1068    }
1069
1070    hdr = (struct rtllib_hdr_4addr *) skb->data;
1071    if ((frag != 0 || (fc & RTLLIB_FCTL_MOREFRAGS))) {
1072        int flen;
1073        struct sk_buff *frag_skb = rtllib_frag_cache_get(ieee, hdr);
1074        RTLLIB_DEBUG_FRAG("Rx Fragment received (%u)\n", frag);
1075
1076        if (!frag_skb) {
1077            RTLLIB_DEBUG(RTLLIB_DL_RX | RTLLIB_DL_FRAG,
1078                    "Rx cannot get skb from fragment "
1079                    "cache (morefrag=%d seq=%u frag=%u)\n",
1080                    (fc & RTLLIB_FCTL_MOREFRAGS) != 0,
1081                    WLAN_GET_SEQ_SEQ(sc), frag);
1082            return -1;
1083        }
1084        flen = skb->len;
1085        if (frag != 0)
1086            flen -= hdrlen;
1087
1088        if (frag_skb->tail + flen > frag_skb->end) {
1089            printk(KERN_WARNING "%s: host decrypted and "
1090                   "reassembled frame did not fit skb\n",
1091                   __func__);
1092            rtllib_frag_cache_invalidate(ieee, hdr);
1093            return -1;
1094        }
1095
1096        if (frag == 0) {
1097            /* copy first fragment (including full headers) into
1098             * beginning of the fragment cache skb */
1099            memcpy(skb_put(frag_skb, flen), skb->data, flen);
1100        } else {
1101            /* append frame payload to the end of the fragment
1102             * cache skb */
1103            memcpy(skb_put(frag_skb, flen), skb->data + hdrlen,
1104                   flen);
1105        }
1106        dev_kfree_skb_any(skb);
1107        skb = NULL;
1108
1109        if (fc & RTLLIB_FCTL_MOREFRAGS) {
1110            /* more fragments expected - leave the skb in fragment
1111             * cache for now; it will be delivered to upper layers
1112             * after all fragments have been received */
1113            return -2;
1114        }
1115
1116        /* this was the last fragment and the frame will be
1117         * delivered, so remove skb from fragment cache */
1118        skb = frag_skb;
1119        hdr = (struct rtllib_hdr_4addr *) skb->data;
1120        rtllib_frag_cache_invalidate(ieee, hdr);
1121    }
1122
1123    /* skb: hdr + (possible reassembled) full MSDU payload; possibly still
1124     * encrypted/authenticated */
1125    if (ieee->host_decrypt && (fc & RTLLIB_FCTL_WEP) &&
1126        rtllib_rx_frame_decrypt_msdu(ieee, skb, keyidx, crypt)) {
1127        printk(KERN_INFO "%s: ==>decrypt msdu error\n", __func__);
1128        return -1;
1129    }
1130
1131    hdr = (struct rtllib_hdr_4addr *) skb->data;
1132    if (crypt && !(fc & RTLLIB_FCTL_WEP) && !ieee->open_wep) {
1133        if (/*ieee->ieee802_1x &&*/
1134            rtllib_is_eapol_frame(ieee, skb, hdrlen)) {
1135
1136            /* pass unencrypted EAPOL frames even if encryption is
1137             * configured */
1138            struct eapol *eap = (struct eapol *)(skb->data +
1139                24);
1140            RTLLIB_DEBUG_EAP("RX: IEEE 802.1X EAPOL frame: %s\n",
1141                        eap_get_type(eap->type));
1142        } else {
1143            RTLLIB_DEBUG_DROP(
1144                "encryption configured, but RX "
1145                "frame not encrypted (SA= %pM)\n",
1146                hdr->addr2);
1147            return -1;
1148        }
1149    }
1150
1151    if (crypt && !(fc & RTLLIB_FCTL_WEP) &&
1152        rtllib_is_eapol_frame(ieee, skb, hdrlen)) {
1153            struct eapol *eap = (struct eapol *)(skb->data +
1154                24);
1155            RTLLIB_DEBUG_EAP("RX: IEEE 802.1X EAPOL frame: %s\n",
1156                        eap_get_type(eap->type));
1157    }
1158
1159    if (crypt && !(fc & RTLLIB_FCTL_WEP) && !ieee->open_wep &&
1160        !rtllib_is_eapol_frame(ieee, skb, hdrlen)) {
1161        RTLLIB_DEBUG_DROP(
1162            "dropped unencrypted RX data "
1163            "frame from %pM"
1164            " (drop_unencrypted=1)\n",
1165            hdr->addr2);
1166        return -1;
1167    }
1168
1169    if (rtllib_is_eapol_frame(ieee, skb, hdrlen))
1170        printk(KERN_WARNING "RX: IEEE802.1X EAPOL frame!\n");
1171
1172    return 0;
1173}
1174
1175static void rtllib_rx_check_leave_lps(struct rtllib_device *ieee, u8 unicast, u8 nr_subframes)
1176{
1177    if (unicast) {
1178
1179        if ((ieee->state == RTLLIB_LINKED)) {
1180            if (((ieee->LinkDetectInfo.NumRxUnicastOkInPeriod +
1181                ieee->LinkDetectInfo.NumTxOkInPeriod) > 8) ||
1182                (ieee->LinkDetectInfo.NumRxUnicastOkInPeriod > 2)) {
1183                if (ieee->LeisurePSLeave)
1184                    ieee->LeisurePSLeave(ieee->dev);
1185            }
1186        }
1187    }
1188    ieee->last_rx_ps_time = jiffies;
1189}
1190
1191static void rtllib_rx_indicate_pkt_legacy(struct rtllib_device *ieee,
1192        struct rtllib_rx_stats *rx_stats,
1193        struct rtllib_rxb *rxb,
1194        u8 *dst,
1195        u8 *src)
1196{
1197    struct net_device *dev = ieee->dev;
1198    u16 ethertype;
1199    int i = 0;
1200
1201    if (rxb == NULL) {
1202        printk(KERN_INFO "%s: rxb is NULL!!\n", __func__);
1203        return ;
1204    }
1205
1206    for (i = 0; i < rxb->nr_subframes; i++) {
1207        struct sk_buff *sub_skb = rxb->subframes[i];
1208
1209        if (sub_skb) {
1210            /* convert hdr + possible LLC headers into Ethernet header */
1211            ethertype = (sub_skb->data[6] << 8) | sub_skb->data[7];
1212            if (sub_skb->len >= 8 &&
1213                ((memcmp(sub_skb->data, rfc1042_header, SNAP_SIZE) == 0 &&
1214                ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
1215                memcmp(sub_skb->data, bridge_tunnel_header, SNAP_SIZE) == 0)) {
1216                /* remove RFC1042 or Bridge-Tunnel encapsulation and
1217                 * replace EtherType */
1218                skb_pull(sub_skb, SNAP_SIZE);
1219                memcpy(skb_push(sub_skb, ETH_ALEN), src, ETH_ALEN);
1220                memcpy(skb_push(sub_skb, ETH_ALEN), dst, ETH_ALEN);
1221            } else {
1222                u16 len;
1223                /* Leave Ethernet header part of hdr and full payload */
1224                len = htons(sub_skb->len);
1225                memcpy(skb_push(sub_skb, 2), &len, 2);
1226                memcpy(skb_push(sub_skb, ETH_ALEN), src, ETH_ALEN);
1227                memcpy(skb_push(sub_skb, ETH_ALEN), dst, ETH_ALEN);
1228            }
1229
1230            ieee->stats.rx_packets++;
1231            ieee->stats.rx_bytes += sub_skb->len;
1232
1233            if (is_multicast_ether_addr(dst))
1234                ieee->stats.multicast++;
1235
1236            /* Indicate the packets to upper layer */
1237            memset(sub_skb->cb, 0, sizeof(sub_skb->cb));
1238            sub_skb->protocol = eth_type_trans(sub_skb, dev);
1239            sub_skb->dev = dev;
1240            sub_skb->dev->stats.rx_packets++;
1241            sub_skb->dev->stats.rx_bytes += sub_skb->len;
1242            sub_skb->ip_summed = CHECKSUM_NONE; /* 802.11 crc not sufficient */
1243            netif_rx(sub_skb);
1244        }
1245    }
1246    kfree(rxb);
1247    rxb = NULL;
1248}
1249
1250static int rtllib_rx_InfraAdhoc(struct rtllib_device *ieee, struct sk_buff *skb,
1251         struct rtllib_rx_stats *rx_stats)
1252{
1253    struct net_device *dev = ieee->dev;
1254    struct rtllib_hdr_4addr *hdr = (struct rtllib_hdr_4addr *)skb->data;
1255    struct lib80211_crypt_data *crypt = NULL;
1256    struct rtllib_rxb *rxb = NULL;
1257    struct rx_ts_record *pTS = NULL;
1258    u16 fc, sc, SeqNum = 0;
1259    u8 type, stype, multicast = 0, unicast = 0, nr_subframes = 0, TID = 0;
1260    u8 dst[ETH_ALEN], src[ETH_ALEN], bssid[ETH_ALEN] = {0}, *payload;
1261    size_t hdrlen = 0;
1262    bool bToOtherSTA = false;
1263    int ret = 0, i = 0;
1264
1265    hdr = (struct rtllib_hdr_4addr *)skb->data;
1266    fc = le16_to_cpu(hdr->frame_ctl);
1267    type = WLAN_FC_GET_TYPE(fc);
1268    stype = WLAN_FC_GET_STYPE(fc);
1269    sc = le16_to_cpu(hdr->seq_ctl);
1270
1271    /*Filter pkt not to me*/
1272    multicast = is_multicast_ether_addr(hdr->addr1);
1273    unicast = !multicast;
1274    if (unicast && (compare_ether_addr(dev->dev_addr, hdr->addr1) != 0)) {
1275        if (ieee->bNetPromiscuousMode)
1276            bToOtherSTA = true;
1277        else
1278            goto rx_dropped;
1279    }
1280
1281    /*Filter pkt has too small length */
1282    hdrlen = rtllib_rx_get_hdrlen(ieee, skb, rx_stats);
1283    if (skb->len < hdrlen) {
1284        printk(KERN_INFO "%s():ERR!!! skb->len is smaller than hdrlen\n", __func__);
1285        goto rx_dropped;
1286    }
1287
1288    /* Filter Duplicate pkt */
1289    ret = rtllib_rx_check_duplicate(ieee, skb, multicast);
1290    if (ret < 0)
1291        goto rx_dropped;
1292
1293    /* Filter CTRL Frame */
1294    if (type == RTLLIB_FTYPE_CTL)
1295        goto rx_dropped;
1296
1297    /* Filter MGNT Frame */
1298    if (type == RTLLIB_FTYPE_MGMT) {
1299        if (bToOtherSTA)
1300            goto rx_dropped;
1301        if (rtllib_rx_frame_mgmt(ieee, skb, rx_stats, type, stype))
1302            goto rx_dropped;
1303        else
1304            goto rx_exit;
1305    }
1306
1307    /* Filter WAPI DATA Frame */
1308
1309    /* Update statstics for AP roaming */
1310    if (!bToOtherSTA) {
1311        ieee->LinkDetectInfo.NumRecvDataInPeriod++;
1312        ieee->LinkDetectInfo.NumRxOkInPeriod++;
1313    }
1314    dev->last_rx = jiffies;
1315
1316    /* Data frame - extract src/dst addresses */
1317    rtllib_rx_extract_addr(ieee, hdr, dst, src, bssid);
1318
1319    /* Filter Data frames */
1320    ret = rtllib_rx_data_filter(ieee, fc, dst, src, bssid, hdr->addr2);
1321    if (ret < 0)
1322        goto rx_dropped;
1323
1324    if (skb->len == hdrlen)
1325        goto rx_dropped;
1326
1327    /* Send pspoll based on moredata */
1328    if ((ieee->iw_mode == IW_MODE_INFRA) && (ieee->sta_sleep == LPS_IS_SLEEP)
1329        && (ieee->polling) && (!bToOtherSTA)) {
1330        if (WLAN_FC_MORE_DATA(fc)) {
1331            /* more data bit is set, let's request a new frame from the AP */
1332            rtllib_sta_ps_send_pspoll_frame(ieee);
1333        } else {
1334            ieee->polling = false;
1335        }
1336    }
1337
1338    /* Get crypt if encrypted */
1339    ret = rtllib_rx_get_crypt(ieee, skb, &crypt, hdrlen);
1340    if (ret == -1)
1341        goto rx_dropped;
1342
1343    /* Decrypt data frame (including reassemble) */
1344    ret = rtllib_rx_decrypt(ieee, skb, rx_stats, crypt, hdrlen);
1345    if (ret == -1)
1346        goto rx_dropped;
1347    else if (ret == -2)
1348        goto rx_exit;
1349
1350    /* Get TS for Rx Reorder */
1351    hdr = (struct rtllib_hdr_4addr *) skb->data;
1352    if (ieee->current_network.qos_data.active && IsQoSDataFrame(skb->data)
1353        && !is_multicast_ether_addr(hdr->addr1)
1354        && (!bToOtherSTA)) {
1355        TID = Frame_QoSTID(skb->data);
1356        SeqNum = WLAN_GET_SEQ_SEQ(sc);
1357        GetTs(ieee, (struct ts_common_info **) &pTS, hdr->addr2, TID, RX_DIR, true);
1358        if (TID != 0 && TID != 3)
1359            ieee->bis_any_nonbepkts = true;
1360    }
1361
1362    /* Parse rx data frame (For AMSDU) */
1363    /* skb: hdr + (possible reassembled) full plaintext payload */
1364    payload = skb->data + hdrlen;
1365    rxb = kmalloc(sizeof(struct rtllib_rxb), GFP_ATOMIC);
1366    if (rxb == NULL) {
1367        RTLLIB_DEBUG(RTLLIB_DL_ERR,
1368                 "%s(): kmalloc rxb error\n", __func__);
1369        goto rx_dropped;
1370    }
1371    /* to parse amsdu packets */
1372    /* qos data packets & reserved bit is 1 */
1373    if (parse_subframe(ieee, skb, rx_stats, rxb, src, dst) == 0) {
1374        /* only to free rxb, and not submit the packets to upper layer */
1375        for (i = 0; i < rxb->nr_subframes; i++)
1376            dev_kfree_skb(rxb->subframes[i]);
1377        kfree(rxb);
1378        rxb = NULL;
1379        goto rx_dropped;
1380    }
1381
1382    /* Update WAPI PN */
1383
1384    /* Check if leave LPS */
1385    if (!bToOtherSTA) {
1386        if (ieee->bIsAggregateFrame)
1387            nr_subframes = rxb->nr_subframes;
1388        else
1389            nr_subframes = 1;
1390        if (unicast)
1391            ieee->LinkDetectInfo.NumRxUnicastOkInPeriod += nr_subframes;
1392        rtllib_rx_check_leave_lps(ieee, unicast, nr_subframes);
1393    }
1394
1395    /* Indicate packets to upper layer or Rx Reorder */
1396    if (ieee->pHTInfo->bCurRxReorderEnable == false || pTS == NULL || bToOtherSTA)
1397        rtllib_rx_indicate_pkt_legacy(ieee, rx_stats, rxb, dst, src);
1398    else
1399        RxReorderIndicatePacket(ieee, rxb, pTS, SeqNum);
1400
1401    dev_kfree_skb(skb);
1402
1403 rx_exit:
1404    return 1;
1405
1406 rx_dropped:
1407    if (rxb != NULL) {
1408        kfree(rxb);
1409        rxb = NULL;
1410    }
1411    ieee->stats.rx_dropped++;
1412
1413    /* Returning 0 indicates to caller that we have not handled the SKB--
1414     * so it is still allocated and can be used again by underlying
1415     * hardware as a DMA target */
1416    return 0;
1417}
1418
1419static int rtllib_rx_Master(struct rtllib_device *ieee, struct sk_buff *skb,
1420         struct rtllib_rx_stats *rx_stats)
1421{
1422    return 0;
1423}
1424
1425static int rtllib_rx_Monitor(struct rtllib_device *ieee, struct sk_buff *skb,
1426         struct rtllib_rx_stats *rx_stats)
1427{
1428    struct rtllib_hdr_4addr *hdr = (struct rtllib_hdr_4addr *)skb->data;
1429    u16 fc = le16_to_cpu(hdr->frame_ctl);
1430    size_t hdrlen = rtllib_get_hdrlen(fc);
1431
1432    if (skb->len < hdrlen) {
1433        printk(KERN_INFO "%s():ERR!!! skb->len is smaller than hdrlen\n", __func__);
1434        return 0;
1435    }
1436
1437    if (HTCCheck(ieee, skb->data)) {
1438        if (net_ratelimit())
1439            printk(KERN_INFO "%s: Find HTCControl!\n", __func__);
1440        hdrlen += 4;
1441    }
1442
1443    rtllib_monitor_rx(ieee, skb, rx_stats, hdrlen);
1444    ieee->stats.rx_packets++;
1445    ieee->stats.rx_bytes += skb->len;
1446
1447    return 1;
1448}
1449
1450static int rtllib_rx_Mesh(struct rtllib_device *ieee, struct sk_buff *skb,
1451         struct rtllib_rx_stats *rx_stats)
1452{
1453    return 0;
1454}
1455
1456/* All received frames are sent to this function. @skb contains the frame in
1457 * IEEE 802.11 format, i.e., in the format it was sent over air.
1458 * This function is called only as a tasklet (software IRQ). */
1459int rtllib_rx(struct rtllib_device *ieee, struct sk_buff *skb,
1460         struct rtllib_rx_stats *rx_stats)
1461{
1462    int ret = 0;
1463
1464    if ((NULL == ieee) || (NULL == skb) || (NULL == rx_stats)) {
1465        printk(KERN_INFO "%s: Input parameters NULL!\n", __func__);
1466        goto rx_dropped;
1467    }
1468    if (skb->len < 10) {
1469        printk(KERN_INFO "%s: SKB length < 10\n", __func__);
1470        goto rx_dropped;
1471    }
1472
1473    switch (ieee->iw_mode) {
1474    case IW_MODE_ADHOC:
1475    case IW_MODE_INFRA:
1476        ret = rtllib_rx_InfraAdhoc(ieee, skb, rx_stats);
1477        break;
1478    case IW_MODE_MASTER:
1479    case IW_MODE_REPEAT:
1480        ret = rtllib_rx_Master(ieee, skb, rx_stats);
1481        break;
1482    case IW_MODE_MONITOR:
1483        ret = rtllib_rx_Monitor(ieee, skb, rx_stats);
1484        break;
1485    case IW_MODE_MESH:
1486        ret = rtllib_rx_Mesh(ieee, skb, rx_stats);
1487        break;
1488    default:
1489        printk(KERN_INFO"%s: ERR iw mode!!!\n", __func__);
1490        break;
1491    }
1492
1493    return ret;
1494
1495 rx_dropped:
1496    ieee->stats.rx_dropped++;
1497    return 0;
1498}
1499EXPORT_SYMBOL(rtllib_rx);
1500
1501static u8 qos_oui[QOS_OUI_LEN] = { 0x00, 0x50, 0xF2 };
1502
1503/*
1504* Make ther structure we read from the beacon packet has
1505* the right values
1506*/
1507static int rtllib_verify_qos_info(struct rtllib_qos_information_element
1508                     *info_element, int sub_type)
1509{
1510
1511    if (info_element->qui_subtype != sub_type)
1512        return -1;
1513    if (memcmp(info_element->qui, qos_oui, QOS_OUI_LEN))
1514        return -1;
1515    if (info_element->qui_type != QOS_OUI_TYPE)
1516        return -1;
1517    if (info_element->version != QOS_VERSION_1)
1518        return -1;
1519
1520    return 0;
1521}
1522
1523
1524/*
1525 * Parse a QoS parameter element
1526 */
1527static int rtllib_read_qos_param_element(struct rtllib_qos_parameter_info
1528                        *element_param, struct rtllib_info_element
1529                        *info_element)
1530{
1531    int ret = 0;
1532    u16 size = sizeof(struct rtllib_qos_parameter_info) - 2;
1533
1534    if ((info_element == NULL) || (element_param == NULL))
1535        return -1;
1536
1537    if (info_element->id == QOS_ELEMENT_ID && info_element->len == size) {
1538        memcpy(element_param->info_element.qui, info_element->data,
1539               info_element->len);
1540        element_param->info_element.elementID = info_element->id;
1541        element_param->info_element.length = info_element->len;
1542    } else
1543        ret = -1;
1544    if (ret == 0)
1545        ret = rtllib_verify_qos_info(&element_param->info_element,
1546                        QOS_OUI_PARAM_SUB_TYPE);
1547    return ret;
1548}
1549
1550/*
1551 * Parse a QoS information element
1552 */
1553static int rtllib_read_qos_info_element(struct
1554                       rtllib_qos_information_element
1555                       *element_info, struct rtllib_info_element
1556                       *info_element)
1557{
1558    int ret = 0;
1559    u16 size = sizeof(struct rtllib_qos_information_element) - 2;
1560
1561    if (element_info == NULL)
1562        return -1;
1563    if (info_element == NULL)
1564        return -1;
1565
1566    if ((info_element->id == QOS_ELEMENT_ID) && (info_element->len == size)) {
1567        memcpy(element_info->qui, info_element->data,
1568               info_element->len);
1569        element_info->elementID = info_element->id;
1570        element_info->length = info_element->len;
1571    } else
1572        ret = -1;
1573
1574    if (ret == 0)
1575        ret = rtllib_verify_qos_info(element_info,
1576                        QOS_OUI_INFO_SUB_TYPE);
1577    return ret;
1578}
1579
1580
1581/*
1582 * Write QoS parameters from the ac parameters.
1583 */
1584static int rtllib_qos_convert_ac_to_parameters(struct rtllib_qos_parameter_info *param_elm,
1585        struct rtllib_qos_data *qos_data)
1586{
1587    struct rtllib_qos_ac_parameter *ac_params;
1588    struct rtllib_qos_parameters *qos_param = &(qos_data->parameters);
1589    int rc = 0;
1590    int i;
1591    u8 aci;
1592    u8 acm;
1593
1594    qos_data->wmm_acm = 0;
1595    for (i = 0; i < QOS_QUEUE_NUM; i++) {
1596        ac_params = &(param_elm->ac_params_record[i]);
1597
1598        aci = (ac_params->aci_aifsn & 0x60) >> 5;
1599        acm = (ac_params->aci_aifsn & 0x10) >> 4;
1600
1601        if (aci >= QOS_QUEUE_NUM)
1602            continue;
1603        switch (aci) {
1604        case 1:
1605            /* BIT(0) | BIT(3) */
1606            if (acm)
1607                qos_data->wmm_acm |= (0x01<<0)|(0x01<<3);
1608            break;
1609        case 2:
1610            /* BIT(4) | BIT(5) */
1611            if (acm)
1612                qos_data->wmm_acm |= (0x01<<4)|(0x01<<5);
1613            break;
1614        case 3:
1615            /* BIT(6) | BIT(7) */
1616            if (acm)
1617                qos_data->wmm_acm |= (0x01<<6)|(0x01<<7);
1618            break;
1619        case 0:
1620        default:
1621            /* BIT(1) | BIT(2) */
1622            if (acm)
1623                qos_data->wmm_acm |= (0x01<<1)|(0x01<<2);
1624            break;
1625        }
1626
1627        qos_param->aifs[aci] = (ac_params->aci_aifsn) & 0x0f;
1628
1629        /* WMM spec P.11: The minimum value for AIFSN shall be 2 */
1630        qos_param->aifs[aci] = (qos_param->aifs[aci] < 2) ? 2 : qos_param->aifs[aci];
1631
1632        qos_param->cw_min[aci] = ac_params->ecw_min_max & 0x0F;
1633
1634        qos_param->cw_max[aci] = (ac_params->ecw_min_max & 0xF0) >> 4;
1635
1636        qos_param->flag[aci] =
1637            (ac_params->aci_aifsn & 0x10) ? 0x01 : 0x00;
1638        qos_param->tx_op_limit[aci] = le16_to_cpu(ac_params->tx_op_limit);
1639    }
1640    return rc;
1641}
1642
1643/*
1644 * we have a generic data element which it may contain QoS information or
1645 * parameters element. check the information element length to decide
1646 * which type to read
1647 */
1648static int rtllib_parse_qos_info_param_IE(struct rtllib_info_element
1649                         *info_element,
1650                         struct rtllib_network *network)
1651{
1652    int rc = 0;
1653    struct rtllib_qos_information_element qos_info_element;
1654
1655    rc = rtllib_read_qos_info_element(&qos_info_element, info_element);
1656
1657    if (rc == 0) {
1658        network->qos_data.param_count = qos_info_element.ac_info & 0x0F;
1659        network->flags |= NETWORK_HAS_QOS_INFORMATION;
1660    } else {
1661        struct rtllib_qos_parameter_info param_element;
1662
1663        rc = rtllib_read_qos_param_element(&param_element,
1664                              info_element);
1665        if (rc == 0) {
1666            rtllib_qos_convert_ac_to_parameters(&param_element,
1667                                   &(network->qos_data));
1668            network->flags |= NETWORK_HAS_QOS_PARAMETERS;
1669            network->qos_data.param_count =
1670                param_element.info_element.ac_info & 0x0F;
1671        }
1672    }
1673
1674    if (rc == 0) {
1675        RTLLIB_DEBUG_QOS("QoS is supported\n");
1676        network->qos_data.supported = 1;
1677    }
1678    return rc;
1679}
1680
1681#define MFIE_STRING(x) case MFIE_TYPE_ ##x: return #x
1682
1683static const char *get_info_element_string(u16 id)
1684{
1685    switch (id) {
1686    MFIE_STRING(SSID);
1687    MFIE_STRING(RATES);
1688    MFIE_STRING(FH_SET);
1689    MFIE_STRING(DS_SET);
1690    MFIE_STRING(CF_SET);
1691    MFIE_STRING(TIM);
1692    MFIE_STRING(IBSS_SET);
1693    MFIE_STRING(COUNTRY);
1694    MFIE_STRING(HOP_PARAMS);
1695    MFIE_STRING(HOP_TABLE);
1696    MFIE_STRING(REQUEST);
1697    MFIE_STRING(CHALLENGE);
1698    MFIE_STRING(POWER_CONSTRAINT);
1699    MFIE_STRING(POWER_CAPABILITY);
1700    MFIE_STRING(TPC_REQUEST);
1701    MFIE_STRING(TPC_REPORT);
1702    MFIE_STRING(SUPP_CHANNELS);
1703    MFIE_STRING(CSA);
1704    MFIE_STRING(MEASURE_REQUEST);
1705    MFIE_STRING(MEASURE_REPORT);
1706    MFIE_STRING(QUIET);
1707    MFIE_STRING(IBSS_DFS);
1708    MFIE_STRING(RSN);
1709    MFIE_STRING(RATES_EX);
1710    MFIE_STRING(GENERIC);
1711    MFIE_STRING(QOS_PARAMETER);
1712    default:
1713        return "UNKNOWN";
1714    }
1715}
1716
1717static inline void rtllib_extract_country_ie(
1718    struct rtllib_device *ieee,
1719    struct rtllib_info_element *info_element,
1720    struct rtllib_network *network,
1721    u8 *addr2)
1722{
1723    if (IS_DOT11D_ENABLE(ieee)) {
1724        if (info_element->len != 0) {
1725            memcpy(network->CountryIeBuf, info_element->data, info_element->len);
1726            network->CountryIeLen = info_element->len;
1727
1728            if (!IS_COUNTRY_IE_VALID(ieee)) {
1729                if ((rtllib_act_scanning(ieee, false) == true) && (ieee->FirstIe_InScan == 1))
1730                    printk(KERN_INFO "Received beacon ContryIE, SSID: <%s>\n", network->ssid);
1731                Dot11d_UpdateCountryIe(ieee, addr2, info_element->len, info_element->data);
1732            }
1733        }
1734
1735        if (IS_EQUAL_CIE_SRC(ieee, addr2))
1736            UPDATE_CIE_WATCHDOG(ieee);
1737    }
1738
1739}
1740
1741int rtllib_parse_info_param(struct rtllib_device *ieee,
1742        struct rtllib_info_element *info_element,
1743        u16 length,
1744        struct rtllib_network *network,
1745        struct rtllib_rx_stats *stats)
1746{
1747    u8 i;
1748    short offset;
1749    u16 tmp_htcap_len = 0;
1750    u16 tmp_htinfo_len = 0;
1751    u16 ht_realtek_agg_len = 0;
1752    u8 ht_realtek_agg_buf[MAX_IE_LEN];
1753    char rates_str[64];
1754    char *p;
1755
1756    while (length >= sizeof(*info_element)) {
1757        if (sizeof(*info_element) + info_element->len > length) {
1758            RTLLIB_DEBUG_MGMT("Info elem: parse failed: "
1759                         "info_element->len + 2 > left : "
1760                         "info_element->len+2=%zd left=%d, id=%d.\n",
1761                         info_element->len +
1762                         sizeof(*info_element),
1763                         length, info_element->id);
1764            /* We stop processing but don't return an error here
1765             * because some misbehaviour APs break this rule. ie.
1766             * Orinoco AP1000. */
1767            break;
1768        }
1769
1770        switch (info_element->id) {
1771        case MFIE_TYPE_SSID:
1772            if (rtllib_is_empty_essid(info_element->data,
1773                             info_element->len)) {
1774                network->flags |= NETWORK_EMPTY_ESSID;
1775                break;
1776            }
1777
1778            network->ssid_len = min(info_element->len,
1779                        (u8) IW_ESSID_MAX_SIZE);
1780            memcpy(network->ssid, info_element->data, network->ssid_len);
1781            if (network->ssid_len < IW_ESSID_MAX_SIZE)
1782                memset(network->ssid + network->ssid_len, 0,
1783                       IW_ESSID_MAX_SIZE - network->ssid_len);
1784
1785            RTLLIB_DEBUG_MGMT("MFIE_TYPE_SSID: '%s' len=%d.\n",
1786                         network->ssid, network->ssid_len);
1787            break;
1788
1789        case MFIE_TYPE_RATES:
1790            p = rates_str;
1791            network->rates_len = min(info_element->len,
1792                         MAX_RATES_LENGTH);
1793            for (i = 0; i < network->rates_len; i++) {
1794                network->rates[i] = info_element->data[i];
1795                p += snprintf(p, sizeof(rates_str) -
1796                          (p - rates_str), "%02X ",
1797                          network->rates[i]);
1798                if (rtllib_is_ofdm_rate
1799                    (info_element->data[i])) {
1800                    network->flags |= NETWORK_HAS_OFDM;
1801                    if (info_element->data[i] &
1802                        RTLLIB_BASIC_RATE_MASK)
1803                        network->flags &=
1804                            ~NETWORK_HAS_CCK;
1805                }
1806
1807                if (rtllib_is_cck_rate
1808                    (info_element->data[i])) {
1809                    network->flags |= NETWORK_HAS_CCK;
1810                }
1811            }
1812
1813            RTLLIB_DEBUG_MGMT("MFIE_TYPE_RATES: '%s' (%d)\n",
1814                         rates_str, network->rates_len);
1815            break;
1816
1817        case MFIE_TYPE_RATES_EX:
1818            p = rates_str;
1819            network->rates_ex_len = min(info_element->len,
1820                            MAX_RATES_EX_LENGTH);
1821            for (i = 0; i < network->rates_ex_len; i++) {
1822                network->rates_ex[i] = info_element->data[i];
1823                p += snprintf(p, sizeof(rates_str) -
1824                          (p - rates_str), "%02X ",
1825                          network->rates[i]);
1826                if (rtllib_is_ofdm_rate
1827                    (info_element->data[i])) {
1828                    network->flags |= NETWORK_HAS_OFDM;
1829                    if (info_element->data[i] &
1830                        RTLLIB_BASIC_RATE_MASK)
1831                        network->flags &=
1832                            ~NETWORK_HAS_CCK;
1833                }
1834            }
1835
1836            RTLLIB_DEBUG_MGMT("MFIE_TYPE_RATES_EX: '%s' (%d)\n",
1837                         rates_str, network->rates_ex_len);
1838            break;
1839
1840        case MFIE_TYPE_DS_SET:
1841            RTLLIB_DEBUG_MGMT("MFIE_TYPE_DS_SET: %d\n",
1842                         info_element->data[0]);
1843            network->channel = info_element->data[0];
1844            break;
1845
1846        case MFIE_TYPE_FH_SET:
1847            RTLLIB_DEBUG_MGMT("MFIE_TYPE_FH_SET: ignored\n");
1848            break;
1849
1850        case MFIE_TYPE_CF_SET:
1851            RTLLIB_DEBUG_MGMT("MFIE_TYPE_CF_SET: ignored\n");
1852            break;
1853
1854        case MFIE_TYPE_TIM:
1855            if (info_element->len < 4)
1856                break;
1857
1858            network->tim.tim_count = info_element->data[0];
1859            network->tim.tim_period = info_element->data[1];
1860
1861            network->dtim_period = info_element->data[1];
1862            if (ieee->state != RTLLIB_LINKED)
1863                break;
1864            network->last_dtim_sta_time = jiffies;
1865
1866            network->dtim_data = RTLLIB_DTIM_VALID;
1867
1868
1869            if (info_element->data[2] & 1)
1870                network->dtim_data |= RTLLIB_DTIM_MBCAST;
1871
1872            offset = (info_element->data[2] >> 1)*2;
1873
1874
1875            if (ieee->assoc_id < 8*offset ||
1876                ieee->assoc_id > 8*(offset + info_element->len - 3))
1877                break;
1878
1879            offset = (ieee->assoc_id / 8) - offset;
1880            if (info_element->data[3 + offset] &
1881               (1 << (ieee->assoc_id % 8)))
1882                network->dtim_data |= RTLLIB_DTIM_UCAST;
1883
1884            network->listen_interval = network->dtim_period;
1885            break;
1886
1887        case MFIE_TYPE_ERP:
1888            network->erp_value = info_element->data[0];
1889            network->flags |= NETWORK_HAS_ERP_VALUE;
1890            RTLLIB_DEBUG_MGMT("MFIE_TYPE_ERP_SET: %d\n",
1891                         network->erp_value);
1892            break;
1893        case MFIE_TYPE_IBSS_SET:
1894            network->atim_window = info_element->data[0];
1895            RTLLIB_DEBUG_MGMT("MFIE_TYPE_IBSS_SET: %d\n",
1896                         network->atim_window);
1897            break;
1898
1899        case MFIE_TYPE_CHALLENGE:
1900            RTLLIB_DEBUG_MGMT("MFIE_TYPE_CHALLENGE: ignored\n");
1901            break;
1902
1903        case MFIE_TYPE_GENERIC:
1904            RTLLIB_DEBUG_MGMT("MFIE_TYPE_GENERIC: %d bytes\n",
1905                         info_element->len);
1906            if (!rtllib_parse_qos_info_param_IE(info_element,
1907                                   network))
1908                break;
1909            if (info_element->len >= 4 &&
1910                info_element->data[0] == 0x00 &&
1911                info_element->data[1] == 0x50 &&
1912                info_element->data[2] == 0xf2 &&
1913                info_element->data[3] == 0x01) {
1914                network->wpa_ie_len = min(info_element->len + 2,
1915                              MAX_WPA_IE_LEN);
1916                memcpy(network->wpa_ie, info_element,
1917                       network->wpa_ie_len);
1918                break;
1919            }
1920            if (info_element->len == 7 &&
1921                info_element->data[0] == 0x00 &&
1922                info_element->data[1] == 0xe0 &&
1923                info_element->data[2] == 0x4c &&
1924                info_element->data[3] == 0x01 &&
1925                info_element->data[4] == 0x02)
1926                network->Turbo_Enable = 1;
1927
1928            if (tmp_htcap_len == 0) {
1929                if (info_element->len >= 4 &&
1930                   info_element->data[0] == 0x00 &&
1931                   info_element->data[1] == 0x90 &&
1932                   info_element->data[2] == 0x4c &&
1933                   info_element->data[3] == 0x033) {
1934
1935                        tmp_htcap_len = min(info_element->len, (u8)MAX_IE_LEN);
1936                        if (tmp_htcap_len != 0) {
1937                            network->bssht.bdHTSpecVer = HT_SPEC_VER_EWC;
1938                            network->bssht.bdHTCapLen = tmp_htcap_len > sizeof(network->bssht.bdHTCapBuf) ?
1939                                sizeof(network->bssht.bdHTCapBuf) : tmp_htcap_len;
1940                            memcpy(network->bssht.bdHTCapBuf, info_element->data, network->bssht.bdHTCapLen);
1941                        }
1942                }
1943                if (tmp_htcap_len != 0) {
1944                    network->bssht.bdSupportHT = true;
1945                    network->bssht.bdHT1R = ((((struct ht_capab_ele *)(network->bssht.bdHTCapBuf))->MCS[1]) == 0);
1946                } else {
1947                    network->bssht.bdSupportHT = false;
1948                    network->bssht.bdHT1R = false;
1949                }
1950            }
1951
1952
1953            if (tmp_htinfo_len == 0) {
1954                if (info_element->len >= 4 &&
1955                    info_element->data[0] == 0x00 &&
1956                    info_element->data[1] == 0x90 &&
1957                    info_element->data[2] == 0x4c &&
1958                    info_element->data[3] == 0x034) {
1959                    tmp_htinfo_len = min(info_element->len, (u8)MAX_IE_LEN);
1960                    if (tmp_htinfo_len != 0) {
1961                        network->bssht.bdHTSpecVer = HT_SPEC_VER_EWC;
1962                        if (tmp_htinfo_len) {
1963                            network->bssht.bdHTInfoLen = tmp_htinfo_len > sizeof(network->bssht.bdHTInfoBuf) ?
1964                                sizeof(network->bssht.bdHTInfoBuf) : tmp_htinfo_len;
1965                            memcpy(network->bssht.bdHTInfoBuf, info_element->data, network->bssht.bdHTInfoLen);
1966                        }
1967
1968                    }
1969
1970                }
1971            }
1972
1973            if (ieee->aggregation) {
1974                if (network->bssht.bdSupportHT) {
1975                    if (info_element->len >= 4 &&
1976                        info_element->data[0] == 0x00 &&
1977                        info_element->data[1] == 0xe0 &&
1978                        info_element->data[2] == 0x4c &&
1979                        info_element->data[3] == 0x02) {
1980                        ht_realtek_agg_len = min(info_element->len, (u8)MAX_IE_LEN);
1981                        memcpy(ht_realtek_agg_buf, info_element->data, info_element->len);
1982                    }
1983                    if (ht_realtek_agg_len >= 5) {
1984                        network->realtek_cap_exit = true;
1985                        network->bssht.bdRT2RTAggregation = true;
1986
1987                        if ((ht_realtek_agg_buf[4] == 1) && (ht_realtek_agg_buf[5] & 0x02))
1988                            network->bssht.bdRT2RTLongSlotTime = true;
1989
1990                        if ((ht_realtek_agg_buf[4] == 1) && (ht_realtek_agg_buf[5] & RT_HT_CAP_USE_92SE))
1991                            network->bssht.RT2RT_HT_Mode |= RT_HT_CAP_USE_92SE;
1992                    }
1993                }
1994                if (ht_realtek_agg_len >= 5) {
1995                    if ((ht_realtek_agg_buf[5] & RT_HT_CAP_USE_SOFTAP))
1996                        network->bssht.RT2RT_HT_Mode |= RT_HT_CAP_USE_SOFTAP;
1997                }
1998            }
1999
2000            if ((info_element->len >= 3 &&
2001                 info_element->data[0] == 0x00 &&
2002                 info_element->data[1] == 0x05 &&
2003                 info_element->data[2] == 0xb5) ||
2004                 (info_element->len >= 3 &&
2005                 info_element->data[0] == 0x00 &&
2006                 info_element->data[1] == 0x0a &&
2007                 info_element->data[2] == 0xf7) ||
2008                 (info_element->len >= 3 &&
2009                 info_element->data[0] == 0x00 &&
2010                 info_element->data[1] == 0x10 &&
2011                 info_element->data[2] == 0x18)) {
2012                network->broadcom_cap_exist = true;
2013            }
2014            if (info_element->len >= 3 &&
2015                info_element->data[0] == 0x00 &&
2016                info_element->data[1] == 0x0c &&
2017                info_element->data[2] == 0x43)
2018                network->ralink_cap_exist = true;
2019            if ((info_element->len >= 3 &&
2020                 info_element->data[0] == 0x00 &&
2021                 info_element->data[1] == 0x03 &&
2022                 info_element->data[2] == 0x7f) ||
2023                 (info_element->len >= 3 &&
2024                 info_element->data[0] == 0x00 &&
2025                 info_element->data[1] == 0x13 &&
2026                 info_element->data[2] == 0x74))
2027                network->atheros_cap_exist = true;
2028
2029            if ((info_element->len >= 3 &&
2030                 info_element->data[0] == 0x00 &&
2031                 info_element->data[1] == 0x50 &&
2032                 info_element->data[2] == 0x43))
2033                network->marvell_cap_exist = true;
2034            if (info_element->len >= 3 &&
2035                info_element->data[0] == 0x00 &&
2036                info_element->data[1] == 0x40 &&
2037                info_element->data[2] == 0x96)
2038                network->cisco_cap_exist = true;
2039
2040
2041            if (info_element->len >= 3 &&
2042                info_element->data[0] == 0x00 &&
2043                info_element->data[1] == 0x0a &&
2044                info_element->data[2] == 0xf5)
2045                network->airgo_cap_exist = true;
2046
2047            if (info_element->len > 4 &&
2048                info_element->data[0] == 0x00 &&
2049                info_element->data[1] == 0x40 &&
2050                info_element->data[2] == 0x96 &&
2051                info_element->data[3] == 0x01) {
2052                if (info_element->len == 6) {
2053                    memcpy(network->CcxRmState, &info_element[4], 2);
2054                    if (network->CcxRmState[0] != 0)
2055                        network->bCcxRmEnable = true;
2056                    else
2057                        network->bCcxRmEnable = false;
2058                    network->MBssidMask = network->CcxRmState[1] & 0x07;
2059                    if (network->MBssidMask != 0) {
2060                        network->bMBssidValid = true;
2061                        network->MBssidMask = 0xff << (network->MBssidMask);
2062                        memcpy(network->MBssid, network->bssid, ETH_ALEN);
2063                        network->MBssid[5] &= network->MBssidMask;
2064                    } else {
2065                        network->bMBssidValid = false;
2066                    }
2067                } else {
2068                    network->bCcxRmEnable = false;
2069                }
2070            }
2071            if (info_element->len > 4 &&
2072                info_element->data[0] == 0x00 &&
2073                info_element->data[1] == 0x40 &&
2074                info_element->data[2] == 0x96 &&
2075                info_element->data[3] == 0x03) {
2076                if (info_element->len == 5) {
2077                    network->bWithCcxVerNum = true;
2078                    network->BssCcxVerNumber = info_element->data[4];
2079                } else {
2080                    network->bWithCcxVerNum = false;
2081                    network->BssCcxVerNumber = 0;
2082                }
2083            }
2084            if (info_element->len > 4 &&
2085                info_element->data[0] == 0x00 &&
2086                info_element->data[1] == 0x50 &&
2087                info_element->data[2] == 0xf2 &&
2088                info_element->data[3] == 0x04) {
2089                RTLLIB_DEBUG_MGMT("MFIE_TYPE_WZC: %d bytes\n",
2090                             info_element->len);
2091                network->wzc_ie_len = min(info_element->len+2,
2092                              MAX_WZC_IE_LEN);
2093                memcpy(network->wzc_ie, info_element,
2094                        network->wzc_ie_len);
2095            }
2096            break;
2097
2098        case MFIE_TYPE_RSN:
2099            RTLLIB_DEBUG_MGMT("MFIE_TYPE_RSN: %d bytes\n",
2100                         info_element->len);
2101            network->rsn_ie_len = min(info_element->len + 2,
2102                          MAX_WPA_IE_LEN);
2103            memcpy(network->rsn_ie, info_element,
2104                   network->rsn_ie_len);
2105            break;
2106
2107        case MFIE_TYPE_HT_CAP:
2108            RTLLIB_DEBUG_SCAN("MFIE_TYPE_HT_CAP: %d bytes\n",
2109                         info_element->len);
2110            tmp_htcap_len = min(info_element->len, (u8)MAX_IE_LEN);
2111            if (tmp_htcap_len != 0) {
2112                network->bssht.bdHTSpecVer = HT_SPEC_VER_EWC;
2113                network->bssht.bdHTCapLen = tmp_htcap_len > sizeof(network->bssht.bdHTCapBuf) ?
2114                    sizeof(network->bssht.bdHTCapBuf) : tmp_htcap_len;
2115                memcpy(network->bssht.bdHTCapBuf,
2116                       info_element->data,
2117                       network->bssht.bdHTCapLen);
2118
2119                network->bssht.bdSupportHT = true;
2120                network->bssht.bdHT1R = ((((struct ht_capab_ele *)
2121                            network->bssht.bdHTCapBuf))->MCS[1]) == 0;
2122
2123                network->bssht.bdBandWidth = (enum ht_channel_width)
2124                                 (((struct ht_capab_ele *)
2125                                 (network->bssht.bdHTCapBuf))->ChlWidth);
2126            } else {
2127                network->bssht.bdSupportHT = false;
2128                network->bssht.bdHT1R = false;
2129                network->bssht.bdBandWidth = HT_CHANNEL_WIDTH_20;
2130            }
2131            break;
2132
2133
2134        case MFIE_TYPE_HT_INFO:
2135            RTLLIB_DEBUG_SCAN("MFIE_TYPE_HT_INFO: %d bytes\n",
2136                         info_element->len);
2137            tmp_htinfo_len = min(info_element->len, (u8)MAX_IE_LEN);
2138            if (tmp_htinfo_len) {
2139                network->bssht.bdHTSpecVer = HT_SPEC_VER_IEEE;
2140                network->bssht.bdHTInfoLen = tmp_htinfo_len >
2141                    sizeof(network->bssht.bdHTInfoBuf) ?
2142                    sizeof(network->bssht.bdHTInfoBuf) :
2143                    tmp_htinfo_len;
2144                memcpy(network->bssht.bdHTInfoBuf,
2145                       info_element->data,
2146                       network->bssht.bdHTInfoLen);
2147            }
2148            break;
2149
2150        case MFIE_TYPE_AIRONET:
2151            RTLLIB_DEBUG_SCAN("MFIE_TYPE_AIRONET: %d bytes\n",
2152                         info_element->len);
2153            if (info_element->len > IE_CISCO_FLAG_POSITION) {
2154                network->bWithAironetIE = true;
2155
2156                if ((info_element->data[IE_CISCO_FLAG_POSITION]
2157                     & SUPPORT_CKIP_MIC) ||
2158                     (info_element->data[IE_CISCO_FLAG_POSITION]
2159                     & SUPPORT_CKIP_PK))
2160                    network->bCkipSupported = true;
2161                else
2162                    network->bCkipSupported = false;
2163            } else {
2164                network->bWithAironetIE = false;
2165                network->bCkipSupported = false;
2166            }
2167            break;
2168        case MFIE_TYPE_QOS_PARAMETER:
2169            printk(KERN_ERR
2170                   "QoS Error need to parse QOS_PARAMETER IE\n");
2171            break;
2172
2173        case MFIE_TYPE_COUNTRY:
2174            RTLLIB_DEBUG_SCAN("MFIE_TYPE_COUNTRY: %d bytes\n",
2175                         info_element->len);
2176            rtllib_extract_country_ie(ieee, info_element, network,
2177                          network->bssid);
2178            break;
2179/* TODO */
2180        default:
2181            RTLLIB_DEBUG_MGMT
2182                ("Unsupported info element: %s (%d)\n",
2183                 get_info_element_string(info_element->id),
2184                 info_element->id);
2185            break;
2186        }
2187
2188        length -= sizeof(*info_element) + info_element->len;
2189        info_element =
2190            (struct rtllib_info_element *)&info_element->
2191            data[info_element->len];
2192    }
2193
2194    if (!network->atheros_cap_exist && !network->broadcom_cap_exist &&
2195        !network->cisco_cap_exist && !network->ralink_cap_exist &&
2196        !network->bssht.bdRT2RTAggregation)
2197        network->unknown_cap_exist = true;
2198    else
2199        network->unknown_cap_exist = false;
2200    return 0;
2201}
2202
2203static inline u8 rtllib_SignalStrengthTranslate(u8 CurrSS)
2204{
2205    u8 RetSS;
2206
2207    if (CurrSS >= 71 && CurrSS <= 100)
2208        RetSS = 90 + ((CurrSS - 70) / 3);
2209    else if (CurrSS >= 41 && CurrSS <= 70)
2210        RetSS = 78 + ((CurrSS - 40) / 3);
2211    else if (CurrSS >= 31 && CurrSS <= 40)
2212        RetSS = 66 + (CurrSS - 30);
2213    else if (CurrSS >= 21 && CurrSS <= 30)
2214        RetSS = 54 + (CurrSS - 20);
2215    else if (CurrSS >= 5 && CurrSS <= 20)
2216        RetSS = 42 + (((CurrSS - 5) * 2) / 3);
2217    else if (CurrSS == 4)
2218        RetSS = 36;
2219    else if (CurrSS == 3)
2220        RetSS = 27;
2221    else if (CurrSS == 2)
2222        RetSS = 18;
2223    else if (CurrSS == 1)
2224        RetSS = 9;
2225    else
2226        RetSS = CurrSS;
2227
2228    return RetSS;
2229}
2230
2231static long rtllib_translate_todbm(u8 signal_strength_index)
2232{
2233    long signal_power;
2234
2235    signal_power = (long)((signal_strength_index + 1) >> 1);
2236    signal_power -= 95;
2237
2238    return signal_power;
2239}
2240
2241static inline int rtllib_network_init(
2242    struct rtllib_device *ieee,
2243    struct rtllib_probe_response *beacon,
2244    struct rtllib_network *network,
2245    struct rtllib_rx_stats *stats)
2246{
2247
2248    /*
2249    network->qos_data.active = 0;
2250    network->qos_data.supported = 0;
2251    network->qos_data.param_count = 0;
2252    network->qos_data.old_param_count = 0;
2253    */
2254    memset(&network->qos_data, 0, sizeof(struct rtllib_qos_data));
2255
2256    /* Pull out fixed field data */
2257    memcpy(network->bssid, beacon->header.addr3, ETH_ALEN);
2258    network->capability = le16_to_cpu(beacon->capability);
2259    network->last_scanned = jiffies;
2260    network->time_stamp[0] = le32_to_cpu(beacon->time_stamp[0]);
2261    network->time_stamp[1] = le32_to_cpu(beacon->time_stamp[1]);
2262    network->beacon_interval = le32_to_cpu(beacon->beacon_interval);
2263    /* Where to pull this? beacon->listen_interval;*/
2264    network->listen_interval = 0x0A;
2265    network->rates_len = network->rates_ex_len = 0;
2266    network->last_associate = 0;
2267    network->ssid_len = 0;
2268    network->hidden_ssid_len = 0;
2269    memset(network->hidden_ssid, 0, sizeof(network->hidden_ssid));
2270    network->flags = 0;
2271    network->atim_window = 0;
2272    network->erp_value = (network->capability & WLAN_CAPABILITY_IBSS) ?
2273        0x3 : 0x0;
2274    network->berp_info_valid = false;
2275    network->broadcom_cap_exist = false;
2276    network->ralink_cap_exist = false;
2277    network->atheros_cap_exist = false;
2278    network->cisco_cap_exist = false;
2279    network->unknown_cap_exist = false;
2280    network->realtek_cap_exit = false;
2281    network->marvell_cap_exist = false;
2282    network->airgo_cap_exist = false;
2283    network->Turbo_Enable = 0;
2284    network->SignalStrength = stats->SignalStrength;
2285    network->RSSI = stats->SignalStrength;
2286    network->CountryIeLen = 0;
2287    memset(network->CountryIeBuf, 0, MAX_IE_LEN);
2288    HTInitializeBssDesc(&network->bssht);
2289    if (stats->freq == RTLLIB_52GHZ_BAND) {
2290        /* for A band (No DS info) */
2291        network->channel = stats->received_channel;
2292    } else
2293        network->flags |= NETWORK_HAS_CCK;
2294
2295    network->wpa_ie_len = 0;
2296    network->rsn_ie_len = 0;
2297    network->wzc_ie_len = 0;
2298
2299    if (rtllib_parse_info_param(ieee,
2300            beacon->info_element,
2301            (stats->len - sizeof(*beacon)),
2302            network,
2303            stats))
2304        return 1;
2305
2306    network->mode = 0;
2307    if (stats->freq == RTLLIB_52GHZ_BAND)
2308        network->mode = IEEE_A;
2309    else {
2310        if (network->flags & NETWORK_HAS_OFDM)
2311            network->mode |= IEEE_G;
2312        if (network->flags & NETWORK_HAS_CCK)
2313            network->mode |= IEEE_B;
2314    }
2315
2316    if (network->mode == 0) {
2317        RTLLIB_DEBUG_SCAN("Filtered out '%s (%pM)' "
2318                     "network.\n",
2319                     escape_essid(network->ssid,
2320                          network->ssid_len),
2321                     network->bssid);
2322        return 1;
2323    }
2324
2325    if (network->bssht.bdSupportHT) {
2326        if (network->mode == IEEE_A)
2327            network->mode = IEEE_N_5G;
2328        else if (network->mode & (IEEE_G | IEEE_B))
2329            network->mode = IEEE_N_24G;
2330    }
2331    if (rtllib_is_empty_essid(network->ssid, network->ssid_len))
2332        network->flags |= NETWORK_EMPTY_ESSID;
2333    stats->signal = 30 + (stats->SignalStrength * 70) / 100;
2334    stats->noise = rtllib_translate_todbm((u8)(100-stats->signal)) - 25;
2335
2336    memcpy(&network->stats, stats, sizeof(network->stats));
2337
2338    return 0;
2339}
2340
2341static inline int is_same_network(struct rtllib_network *src,
2342                  struct rtllib_network *dst, u8 ssidbroad)
2343{
2344    /* A network is only a duplicate if the channel, BSSID, ESSID
2345     * and the capability field (in particular IBSS and BSS) all match.
2346     * We treat all <hidden> with the same BSSID and channel
2347     * as one network */
2348    return (((src->ssid_len == dst->ssid_len) || (!ssidbroad)) &&
2349        (src->channel == dst->channel) &&
2350        !memcmp(src->bssid, dst->bssid, ETH_ALEN) &&
2351        (!memcmp(src->ssid, dst->ssid, src->ssid_len) ||
2352        (!ssidbroad)) &&
2353        ((src->capability & WLAN_CAPABILITY_IBSS) ==
2354        (dst->capability & WLAN_CAPABILITY_IBSS)) &&
2355        ((src->capability & WLAN_CAPABILITY_ESS) ==
2356        (dst->capability & WLAN_CAPABILITY_ESS)));
2357}
2358
2359static inline void update_ibss_network(struct rtllib_network *dst,
2360                  struct rtllib_network *src)
2361{
2362    memcpy(&dst->stats, &src->stats, sizeof(struct rtllib_rx_stats));
2363    dst->last_scanned = jiffies;
2364}
2365
2366
2367static inline void update_network(struct rtllib_network *dst,
2368                  struct rtllib_network *src)
2369{
2370    int qos_active;
2371    u8 old_param;
2372
2373    memcpy(&dst->stats, &src->stats, sizeof(struct rtllib_rx_stats));
2374    dst->capability = src->capability;
2375    memcpy(dst->rates, src->rates, src->rates_len);
2376    dst->rates_len = src->rates_len;
2377    memcpy(dst->rates_ex, src->rates_ex, src->rates_ex_len);
2378    dst->rates_ex_len = src->rates_ex_len;
2379    if (src->ssid_len > 0) {
2380        if (dst->ssid_len == 0) {
2381            memset(dst->hidden_ssid, 0, sizeof(dst->hidden_ssid));
2382            dst->hidden_ssid_len = src->ssid_len;
2383            memcpy(dst->hidden_ssid, src->ssid, src->ssid_len);
2384        } else {
2385            memset(dst->ssid, 0, dst->ssid_len);
2386            dst->ssid_len = src->ssid_len;
2387            memcpy(dst->ssid, src->ssid, src->ssid_len);
2388        }
2389    }
2390    dst->mode = src->mode;
2391    dst->flags = src->flags;
2392    dst->time_stamp[0] = src->time_stamp[0];
2393    dst->time_stamp[1] = src->time_stamp[1];
2394    if (src->flags & NETWORK_HAS_ERP_VALUE) {
2395        dst->erp_value = src->erp_value;
2396        dst->berp_info_valid = src->berp_info_valid = true;
2397    }
2398    dst->beacon_interval = src->beacon_interval;
2399    dst->listen_interval = src->listen_interval;
2400    dst->atim_window = src->atim_window;
2401    dst->dtim_period = src->dtim_period;
2402    dst->dtim_data = src->dtim_data;
2403    dst->last_dtim_sta_time = src->last_dtim_sta_time;
2404    memcpy(&dst->tim, &src->tim, sizeof(struct rtllib_tim_parameters));
2405
2406    dst->bssht.bdSupportHT = src->bssht.bdSupportHT;
2407    dst->bssht.bdRT2RTAggregation = src->bssht.bdRT2RTAggregation;
2408    dst->bssht.bdHTCapLen = src->bssht.bdHTCapLen;
2409    memcpy(dst->bssht.bdHTCapBuf, src->bssht.bdHTCapBuf,
2410           src->bssht.bdHTCapLen);
2411    dst->bssht.bdHTInfoLen = src->bssht.bdHTInfoLen;
2412    memcpy(dst->bssht.bdHTInfoBuf, src->bssht.bdHTInfoBuf,
2413           src->bssht.bdHTInfoLen);
2414    dst->bssht.bdHTSpecVer = src->bssht.bdHTSpecVer;
2415    dst->bssht.bdRT2RTLongSlotTime = src->bssht.bdRT2RTLongSlotTime;
2416    dst->broadcom_cap_exist = src->broadcom_cap_exist;
2417    dst->ralink_cap_exist = src->ralink_cap_exist;
2418    dst->atheros_cap_exist = src->atheros_cap_exist;
2419    dst->realtek_cap_exit = src->realtek_cap_exit;
2420    dst->marvell_cap_exist = src->marvell_cap_exist;
2421    dst->cisco_cap_exist = src->cisco_cap_exist;
2422    dst->airgo_cap_exist = src->airgo_cap_exist;
2423    dst->unknown_cap_exist = src->unknown_cap_exist;
2424    memcpy(dst->wpa_ie, src->wpa_ie, src->wpa_ie_len);
2425    dst->wpa_ie_len = src->wpa_ie_len;
2426    memcpy(dst->rsn_ie, src->rsn_ie, src->rsn_ie_len);
2427    dst->rsn_ie_len = src->rsn_ie_len;
2428    memcpy(dst->wzc_ie, src->wzc_ie, src->wzc_ie_len);
2429    dst->wzc_ie_len = src->wzc_ie_len;
2430
2431    dst->last_scanned = jiffies;
2432    /* qos related parameters */
2433    qos_active = dst->qos_data.active;
2434    old_param = dst->qos_data.param_count;
2435    dst->qos_data.supported = src->qos_data.supported;
2436    if (dst->flags & NETWORK_HAS_QOS_PARAMETERS)
2437        memcpy(&dst->qos_data, &src->qos_data,
2438               sizeof(struct rtllib_qos_data));
2439    if (dst->qos_data.supported == 1) {
2440        if (dst->ssid_len)
2441            RTLLIB_DEBUG_QOS
2442                ("QoS the network %s is QoS supported\n",
2443                dst->ssid);
2444        else
2445            RTLLIB_DEBUG_QOS
2446                ("QoS the network is QoS supported\n");
2447    }
2448    dst->qos_data.active = qos_active;
2449    dst->qos_data.old_param_count = old_param;
2450
2451    /* dst->last_associate is not overwritten */
2452    dst->wmm_info = src->wmm_info;
2453    if (src->wmm_param[0].ac_aci_acm_aifsn ||
2454       src->wmm_param[1].ac_aci_acm_aifsn ||
2455       src->wmm_param[2].ac_aci_acm_aifsn ||
2456       src->wmm_param[3].ac_aci_acm_aifsn)
2457        memcpy(dst->wmm_param, src->wmm_param, WME_AC_PRAM_LEN);
2458
2459    dst->SignalStrength = src->SignalStrength;
2460    dst->RSSI = src->RSSI;
2461    dst->Turbo_Enable = src->Turbo_Enable;
2462
2463    dst->CountryIeLen = src->CountryIeLen;
2464    memcpy(dst->CountryIeBuf, src->CountryIeBuf, src->CountryIeLen);
2465
2466    dst->bWithAironetIE = src->bWithAironetIE;
2467    dst->bCkipSupported = src->bCkipSupported;
2468    memcpy(dst->CcxRmState, src->CcxRmState, 2);
2469    dst->bCcxRmEnable = src->bCcxRmEnable;
2470    dst->MBssidMask = src->MBssidMask;
2471    dst->bMBssidValid = src->bMBssidValid;
2472    memcpy(dst->MBssid, src->MBssid, 6);
2473    dst->bWithCcxVerNum = src->bWithCcxVerNum;
2474    dst->BssCcxVerNumber = src->BssCcxVerNumber;
2475}
2476
2477static inline int is_beacon(__le16 fc)
2478{
2479    return (WLAN_FC_GET_STYPE(le16_to_cpu(fc)) == RTLLIB_STYPE_BEACON);
2480}
2481
2482static int IsPassiveChannel(struct rtllib_device *rtllib, u8 channel)
2483{
2484    if (MAX_CHANNEL_NUMBER < channel) {
2485        printk(KERN_INFO "%s(): Invalid Channel\n", __func__);
2486        return 0;
2487    }
2488
2489    if (rtllib->active_channel_map[channel] == 2)
2490        return 1;
2491
2492    return 0;
2493}
2494
2495int rtllib_legal_channel(struct rtllib_device *rtllib, u8 channel)
2496{
2497    if (MAX_CHANNEL_NUMBER < channel) {
2498        printk(KERN_INFO "%s(): Invalid Channel\n", __func__);
2499        return 0;
2500    }
2501    if (rtllib->active_channel_map[channel] > 0)
2502        return 1;
2503
2504    return 0;
2505}
2506EXPORT_SYMBOL(rtllib_legal_channel);
2507
2508static inline void rtllib_process_probe_response(
2509    struct rtllib_device *ieee,
2510    struct rtllib_probe_response *beacon,
2511    struct rtllib_rx_stats *stats)
2512{
2513    struct rtllib_network *target;
2514    struct rtllib_network *oldest = NULL;
2515    struct rtllib_info_element *info_element = &beacon->info_element[0];
2516    unsigned long flags;
2517    short renew;
2518    struct rtllib_network *network = kzalloc(sizeof(struct rtllib_network),
2519                         GFP_ATOMIC);
2520
2521    if (!network)
2522        return;
2523
2524    RTLLIB_DEBUG_SCAN(
2525        "'%s' ( %pM ): %c%c%c%c %c%c%c%c-%c%c%c%c %c%c%c%c\n",
2526        escape_essid(info_element->data, info_element->len),
2527        beacon->header.addr3,
2528        (beacon->capability & (1<<0xf)) ? '1' : '0',
2529        (beacon->capability & (1<<0xe)) ? '1' : '0',
2530        (beacon->capability & (1<<0xd)) ? '1' : '0',
2531        (beacon->capability & (1<<0xc)) ? '1' : '0',
2532        (beacon->capability & (1<<0xb)) ? '1' : '0',
2533        (beacon->capability & (1<<0xa)) ? '1' : '0',
2534        (beacon->capability & (1<<0x9)) ? '1' : '0',
2535        (beacon->capability & (1<<0x8)) ? '1' : '0',
2536        (beacon->capability & (1<<0x7)) ? '1' : '0',
2537        (beacon->capability & (1<<0x6)) ? '1' : '0',
2538        (beacon->capability & (1<<0x5)) ? '1' : '0',
2539        (beacon->capability & (1<<0x4)) ? '1' : '0',
2540        (beacon->capability & (1<<0x3)) ? '1' : '0',
2541        (beacon->capability & (1<<0x2)) ? '1' : '0',
2542        (beacon->capability & (1<<0x1)) ? '1' : '0',
2543        (beacon->capability & (1<<0x0)) ? '1' : '0');
2544
2545    if (rtllib_network_init(ieee, beacon, network, stats)) {
2546        RTLLIB_DEBUG_SCAN("Dropped '%s' ( %pM) via %s.\n",
2547                  escape_essid(info_element->data,
2548                  info_element->len),
2549                  beacon->header.addr3,
2550                  WLAN_FC_GET_STYPE(beacon->header.frame_ctl) ==
2551                  RTLLIB_STYPE_PROBE_RESP ?
2552                  "PROBE RESPONSE" : "BEACON");
2553        goto free_network;
2554    }
2555
2556
2557    if (!rtllib_legal_channel(ieee, network->channel))
2558        goto free_network;
2559
2560    if (WLAN_FC_GET_STYPE(beacon->header.frame_ctl) ==
2561        RTLLIB_STYPE_PROBE_RESP) {
2562        if (IsPassiveChannel(ieee, network->channel)) {
2563            printk(KERN_INFO "GetScanInfo(): For Global Domain, "
2564                   "filter probe response at channel(%d).\n",
2565                   network->channel);
2566            goto free_network;
2567        }
2568    }
2569
2570    /* The network parsed correctly -- so now we scan our known networks
2571     * to see if we can find it in our list.
2572     *
2573     * NOTE: This search is definitely not optimized. Once its doing
2574     * the "right thing" we'll optimize it for efficiency if
2575     * necessary */
2576
2577    /* Search for this entry in the list and update it if it is
2578     * already there. */
2579
2580    spin_lock_irqsave(&ieee->lock, flags);
2581    if (is_same_network(&ieee->current_network, network,
2582       (network->ssid_len ? 1 : 0))) {
2583        update_network(&ieee->current_network, network);
2584        if ((ieee->current_network.mode == IEEE_N_24G ||
2585             ieee->current_network.mode == IEEE_G)
2586             && ieee->current_network.berp_info_valid) {
2587            if (ieee->current_network.erp_value & ERP_UseProtection)
2588                ieee->current_network.buseprotection = true;
2589            else
2590                ieee->current_network.buseprotection = false;
2591        }
2592        if (is_beacon(beacon->header.frame_ctl)) {
2593            if (ieee->state >= RTLLIB_LINKED)
2594                ieee->LinkDetectInfo.NumRecvBcnInPeriod++;
2595        }
2596    }
2597    list_for_each_entry(target, &ieee->network_list, list) {
2598        if (is_same_network(target, network,
2599           (target->ssid_len ? 1 : 0)))
2600            break;
2601        if ((oldest == NULL) ||
2602            (target->last_scanned < oldest->last_scanned))
2603            oldest = target;
2604    }
2605
2606    /* If we didn't find a match, then get a new network slot to initialize
2607     * with this beacon's information */
2608    if (&target->list == &ieee->network_list) {
2609        if (list_empty(&ieee->network_free_list)) {
2610            /* If there are no more slots, expire the oldest */
2611            list_del(&oldest->list);
2612            target = oldest;
2613            RTLLIB_DEBUG_SCAN("Expired '%s' ( %pM) from "
2614                         "network list.\n",
2615                         escape_essid(target->ssid,
2616                              target->ssid_len),
2617                         target->bssid);
2618        } else {
2619            /* Otherwise just pull from the free list */
2620            target = list_entry(ieee->network_free_list.next,
2621                        struct rtllib_network, list);
2622            list_del(ieee->network_free_list.next);
2623        }
2624
2625
2626        RTLLIB_DEBUG_SCAN("Adding '%s' ( %pM) via %s.\n",
2627                  escape_essid(network->ssid,
2628                  network->ssid_len), network->bssid,
2629                  WLAN_FC_GET_STYPE(beacon->header.frame_ctl) ==
2630                  RTLLIB_STYPE_PROBE_RESP ?
2631                  "PROBE RESPONSE" : "BEACON");
2632        memcpy(target, network, sizeof(*target));
2633        list_add_tail(&target->list, &ieee->network_list);
2634        if (ieee->softmac_features & IEEE_SOFTMAC_ASSOCIATE)
2635            rtllib_softmac_new_net(ieee, network);
2636    } else {
2637        RTLLIB_DEBUG_SCAN("Updating '%s' ( %pM) via %s.\n",
2638                  escape_essid(target->ssid,
2639                  target->ssid_len), target->bssid,
2640                  WLAN_FC_GET_STYPE(beacon->header.frame_ctl) ==
2641                  RTLLIB_STYPE_PROBE_RESP ?
2642                  "PROBE RESPONSE" : "BEACON");
2643
2644        /* we have an entry and we are going to update it. But this
2645         * entry may be already expired. In this case we do the same
2646         * as we found a new net and call the new_net handler
2647         */
2648        renew = !time_after(target->last_scanned + ieee->scan_age,
2649                    jiffies);
2650        if ((!target->ssid_len) &&
2651            (((network->ssid_len > 0) && (target->hidden_ssid_len == 0))
2652            || ((ieee->current_network.ssid_len == network->ssid_len) &&
2653            (strncmp(ieee->current_network.ssid, network->ssid,
2654            network->ssid_len) == 0) &&
2655            (ieee->state == RTLLIB_NOLINK))))
2656            renew = 1;
2657        update_network(target, network);
2658        if (renew && (ieee->softmac_features & IEEE_SOFTMAC_ASSOCIATE))
2659            rtllib_softmac_new_net(ieee, network);
2660    }
2661
2662    spin_unlock_irqrestore(&ieee->lock, flags);
2663    if (is_beacon(beacon->header.frame_ctl) &&
2664        is_same_network(&ieee->current_network, network,
2665        (network->ssid_len ? 1 : 0)) &&
2666        (ieee->state == RTLLIB_LINKED)) {
2667        if (ieee->handle_beacon != NULL)
2668            ieee->handle_beacon(ieee->dev, beacon,
2669                        &ieee->current_network);
2670    }
2671free_network:
2672    kfree(network);
2673    return;
2674}
2675
2676void rtllib_rx_mgt(struct rtllib_device *ieee,
2677              struct sk_buff *skb,
2678              struct rtllib_rx_stats *stats)
2679{
2680    struct rtllib_hdr_4addr *header = (struct rtllib_hdr_4addr *)skb->data ;
2681
2682    if (WLAN_FC_GET_STYPE(header->frame_ctl) != RTLLIB_STYPE_PROBE_RESP &&
2683        WLAN_FC_GET_STYPE(header->frame_ctl) != RTLLIB_STYPE_BEACON)
2684        ieee->last_rx_ps_time = jiffies;
2685
2686    switch (WLAN_FC_GET_STYPE(header->frame_ctl)) {
2687
2688    case RTLLIB_STYPE_BEACON:
2689        RTLLIB_DEBUG_MGMT("received BEACON (%d)\n",
2690                  WLAN_FC_GET_STYPE(header->frame_ctl));
2691        RTLLIB_DEBUG_SCAN("Beacon\n");
2692        rtllib_process_probe_response(
2693                ieee, (struct rtllib_probe_response *)header,
2694                stats);
2695
2696        if (ieee->sta_sleep || (ieee->ps != RTLLIB_PS_DISABLED &&
2697            ieee->iw_mode == IW_MODE_INFRA &&
2698            ieee->state == RTLLIB_LINKED))
2699            tasklet_schedule(&ieee->ps_task);
2700
2701        break;
2702
2703    case RTLLIB_STYPE_PROBE_RESP:
2704        RTLLIB_DEBUG_MGMT("received PROBE RESPONSE (%d)\n",
2705            WLAN_FC_GET_STYPE(header->frame_ctl));
2706        RTLLIB_DEBUG_SCAN("Probe response\n");
2707        rtllib_process_probe_response(ieee,
2708                  (struct rtllib_probe_response *)header, stats);
2709        break;
2710    case RTLLIB_STYPE_PROBE_REQ:
2711        RTLLIB_DEBUG_MGMT("received PROBE RESQUEST (%d)\n",
2712                  WLAN_FC_GET_STYPE(header->frame_ctl));
2713        RTLLIB_DEBUG_SCAN("Probe request\n");
2714        if ((ieee->softmac_features & IEEE_SOFTMAC_PROBERS) &&
2715            ((ieee->iw_mode == IW_MODE_ADHOC ||
2716            ieee->iw_mode == IW_MODE_MASTER) &&
2717            ieee->state == RTLLIB_LINKED))
2718            rtllib_rx_probe_rq(ieee, skb);
2719        break;
2720    }
2721}
2722

Archive Download this file



interactive