e468e155e8be96f44d7f4c77e304361609bef608
[linux-2.6.git] / drivers / net / wireless / libertas / scan.c
1 /**
2   * Functions implementing wlan scan IOCTL and firmware command APIs
3   *
4   * IOCTL handlers as well as command preperation and response routines
5   *  for sending scan commands to the firmware.
6   */
7 #include <linux/types.h>
8 #include <linux/kernel.h>
9 #include <linux/etherdevice.h>
10 #include <linux/if_arp.h>
11 #include <asm/unaligned.h>
12 #include <net/lib80211.h>
13
14 #include "host.h"
15 #include "decl.h"
16 #include "dev.h"
17 #include "scan.h"
18 #include "cmd.h"
19
20 //! Approximate amount of data needed to pass a scan result back to iwlist
21 #define MAX_SCAN_CELL_SIZE  (IW_EV_ADDR_LEN             \
22                              + IW_ESSID_MAX_SIZE        \
23                              + IW_EV_UINT_LEN           \
24                              + IW_EV_FREQ_LEN           \
25                              + IW_EV_QUAL_LEN           \
26                              + IW_ESSID_MAX_SIZE        \
27                              + IW_EV_PARAM_LEN          \
28                              + 40)      /* 40 for WPAIE */
29
30 //! Memory needed to store a max sized channel List TLV for a firmware scan
31 #define CHAN_TLV_MAX_SIZE  (sizeof(struct mrvl_ie_header)    \
32                             + (MRVDRV_MAX_CHANNELS_PER_SCAN     \
33                                * sizeof(struct chanscanparamset)))
34
35 //! Memory needed to store a max number/size SSID TLV for a firmware scan
36 #define SSID_TLV_MAX_SIZE  (1 * sizeof(struct mrvl_ie_ssid_param_set))
37
38 //! Maximum memory needed for a cmd_ds_802_11_scan with all TLVs at max
39 #define MAX_SCAN_CFG_ALLOC (sizeof(struct cmd_ds_802_11_scan)   \
40                             + CHAN_TLV_MAX_SIZE + SSID_TLV_MAX_SIZE)
41
42 //! The maximum number of channels the firmware can scan per command
43 #define MRVDRV_MAX_CHANNELS_PER_SCAN   14
44
45 /**
46  * @brief Number of channels to scan per firmware scan command issuance.
47  *
48  *  Number restricted to prevent hitting the limit on the amount of scan data
49  *  returned in a single firmware scan command.
50  */
51 #define MRVDRV_CHANNELS_PER_SCAN_CMD   4
52
53 //! Scan time specified in the channel TLV for each channel for passive scans
54 #define MRVDRV_PASSIVE_SCAN_CHAN_TIME  100
55
56 //! Scan time specified in the channel TLV for each channel for active scans
57 #define MRVDRV_ACTIVE_SCAN_CHAN_TIME   100
58
59 #define DEFAULT_MAX_SCAN_AGE (15 * HZ)
60
61 static int lbs_ret_80211_scan(struct lbs_private *priv, unsigned long dummy,
62                               struct cmd_header *resp);
63
64 /*********************************************************************/
65 /*                                                                   */
66 /*  Misc helper functions                                            */
67 /*                                                                   */
68 /*********************************************************************/
69
70 /**
71  *  @brief Unsets the MSB on basic rates
72  *
73  * Scan through an array and unset the MSB for basic data rates.
74  *
75  *  @param rates     buffer of data rates
76  *  @param len       size of buffer
77  */
78 static void lbs_unset_basic_rate_flags(u8 *rates, size_t len)
79 {
80         int i;
81
82         for (i = 0; i < len; i++)
83                 rates[i] &= 0x7f;
84 }
85
86
87 static inline void clear_bss_descriptor(struct bss_descriptor *bss)
88 {
89         /* Don't blow away ->list, just BSS data */
90         memset(bss, 0, offsetof(struct bss_descriptor, list));
91 }
92
93 /**
94  *  @brief Compare two SSIDs
95  *
96  *  @param ssid1    A pointer to ssid to compare
97  *  @param ssid2    A pointer to ssid to compare
98  *
99  *  @return         0: ssid is same, otherwise is different
100  */
101 int lbs_ssid_cmp(uint8_t *ssid1, uint8_t ssid1_len, uint8_t *ssid2,
102                  uint8_t ssid2_len)
103 {
104         if (ssid1_len != ssid2_len)
105                 return -1;
106
107         return memcmp(ssid1, ssid2, ssid1_len);
108 }
109
110 static inline int is_same_network(struct bss_descriptor *src,
111                                   struct bss_descriptor *dst)
112 {
113         /* A network is only a duplicate if the channel, BSSID, and ESSID
114          * all match.  We treat all <hidden> with the same BSSID and channel
115          * as one network */
116         return ((src->ssid_len == dst->ssid_len) &&
117                 (src->channel == dst->channel) &&
118                 !compare_ether_addr(src->bssid, dst->bssid) &&
119                 !memcmp(src->ssid, dst->ssid, src->ssid_len));
120 }
121
122
123
124
125 /*********************************************************************/
126 /*                                                                   */
127 /*  Main scanning support                                            */
128 /*                                                                   */
129 /*********************************************************************/
130
131 /**
132  *  @brief Create a channel list for the driver to scan based on region info
133  *
134  *  Only used from lbs_scan_setup_scan_config()
135  *
136  *  Use the driver region/band information to construct a comprehensive list
137  *    of channels to scan.  This routine is used for any scan that is not
138  *    provided a specific channel list to scan.
139  *
140  *  @param priv          A pointer to struct lbs_private structure
141  *  @param scanchanlist  Output parameter: resulting channel list to scan
142  *
143  *  @return              void
144  */
145 static int lbs_scan_create_channel_list(struct lbs_private *priv,
146                                         struct chanscanparamset *scanchanlist)
147 {
148         struct region_channel *scanregion;
149         struct chan_freq_power *cfp;
150         int rgnidx;
151         int chanidx;
152         int nextchan;
153         uint8_t scantype;
154
155         chanidx = 0;
156
157         /* Set the default scan type to the user specified type, will later
158          *   be changed to passive on a per channel basis if restricted by
159          *   regulatory requirements (11d or 11h)
160          */
161         scantype = CMD_SCAN_TYPE_ACTIVE;
162
163         for (rgnidx = 0; rgnidx < ARRAY_SIZE(priv->region_channel); rgnidx++) {
164                 if (priv->enable11d && (priv->connect_status != LBS_CONNECTED)
165                     && (priv->mesh_connect_status != LBS_CONNECTED)) {
166                         /* Scan all the supported chan for the first scan */
167                         if (!priv->universal_channel[rgnidx].valid)
168                                 continue;
169                         scanregion = &priv->universal_channel[rgnidx];
170
171                         /* clear the parsed_region_chan for the first scan */
172                         memset(&priv->parsed_region_chan, 0x00,
173                                sizeof(priv->parsed_region_chan));
174                 } else {
175                         if (!priv->region_channel[rgnidx].valid)
176                                 continue;
177                         scanregion = &priv->region_channel[rgnidx];
178                 }
179
180                 for (nextchan = 0; nextchan < scanregion->nrcfp; nextchan++, chanidx++) {
181                         struct chanscanparamset *chan = &scanchanlist[chanidx];
182
183                         cfp = scanregion->CFP + nextchan;
184
185                         if (priv->enable11d)
186                                 scantype = lbs_get_scan_type_11d(cfp->channel,
187                                                                  &priv->parsed_region_chan);
188
189                         if (scanregion->band == BAND_B || scanregion->band == BAND_G)
190                                 chan->radiotype = CMD_SCAN_RADIO_TYPE_BG;
191
192                         if (scantype == CMD_SCAN_TYPE_PASSIVE) {
193                                 chan->maxscantime = cpu_to_le16(MRVDRV_PASSIVE_SCAN_CHAN_TIME);
194                                 chan->chanscanmode.passivescan = 1;
195                         } else {
196                                 chan->maxscantime = cpu_to_le16(MRVDRV_ACTIVE_SCAN_CHAN_TIME);
197                                 chan->chanscanmode.passivescan = 0;
198                         }
199
200                         chan->channumber = cfp->channel;
201                 }
202         }
203         return chanidx;
204 }
205
206 /*
207  * Add SSID TLV of the form:
208  *
209  * TLV-ID SSID     00 00
210  * length          06 00
211  * ssid            4d 4e 54 45 53 54
212  */
213 static int lbs_scan_add_ssid_tlv(struct lbs_private *priv, u8 *tlv)
214 {
215         struct mrvl_ie_ssid_param_set *ssid_tlv = (void *)tlv;
216
217         ssid_tlv->header.type = cpu_to_le16(TLV_TYPE_SSID);
218         ssid_tlv->header.len = cpu_to_le16(priv->scan_ssid_len);
219         memcpy(ssid_tlv->ssid, priv->scan_ssid, priv->scan_ssid_len);
220         return sizeof(ssid_tlv->header) + priv->scan_ssid_len;
221 }
222
223 /*
224  * Add CHANLIST TLV of the form
225  *
226  * TLV-ID CHANLIST 01 01
227  * length          5b 00
228  * channel 1       00 01 00 00 00 64 00
229  *   radio type    00
230  *   channel          01
231  *   scan type           00
232  *   min scan time          00 00
233  *   max scan time                64 00
234  * channel 2       00 02 00 00 00 64 00
235  * channel 3       00 03 00 00 00 64 00
236  * channel 4       00 04 00 00 00 64 00
237  * channel 5       00 05 00 00 00 64 00
238  * channel 6       00 06 00 00 00 64 00
239  * channel 7       00 07 00 00 00 64 00
240  * channel 8       00 08 00 00 00 64 00
241  * channel 9       00 09 00 00 00 64 00
242  * channel 10      00 0a 00 00 00 64 00
243  * channel 11      00 0b 00 00 00 64 00
244  * channel 12      00 0c 00 00 00 64 00
245  * channel 13      00 0d 00 00 00 64 00
246  *
247  */
248 static int lbs_scan_add_chanlist_tlv(uint8_t *tlv,
249                                      struct chanscanparamset *chan_list,
250                                      int chan_count)
251 {
252         size_t size = sizeof(struct chanscanparamset) *chan_count;
253         struct mrvl_ie_chanlist_param_set *chan_tlv = (void *)tlv;
254
255         chan_tlv->header.type = cpu_to_le16(TLV_TYPE_CHANLIST);
256         memcpy(chan_tlv->chanscanparam, chan_list, size);
257         chan_tlv->header.len = cpu_to_le16(size);
258         return sizeof(chan_tlv->header) + size;
259 }
260
261 /*
262  * Add RATES TLV of the form
263  *
264  * TLV-ID RATES    01 00
265  * length          0e 00
266  * rates           82 84 8b 96 0c 12 18 24 30 48 60 6c
267  *
268  * The rates are in lbs_bg_rates[], but for the 802.11b
269  * rates the high bit isn't set.
270  */
271 static int lbs_scan_add_rates_tlv(uint8_t *tlv)
272 {
273         int i;
274         struct mrvl_ie_rates_param_set *rate_tlv = (void *)tlv;
275
276         rate_tlv->header.type = cpu_to_le16(TLV_TYPE_RATES);
277         tlv += sizeof(rate_tlv->header);
278         for (i = 0; i < MAX_RATES; i++) {
279                 *tlv = lbs_bg_rates[i];
280                 if (*tlv == 0)
281                         break;
282                 /* This code makes sure that the 802.11b rates (1 MBit/s, 2
283                    MBit/s, 5.5 MBit/s and 11 MBit/s get's the high bit set.
284                    Note that the values are MBit/s * 2, to mark them as
285                    basic rates so that the firmware likes it better */
286                 if (*tlv == 0x02 || *tlv == 0x04 ||
287                     *tlv == 0x0b || *tlv == 0x16)
288                         *tlv |= 0x80;
289                 tlv++;
290         }
291         rate_tlv->header.len = cpu_to_le16(i);
292         return sizeof(rate_tlv->header) + i;
293 }
294
295 /*
296  * Generate the CMD_802_11_SCAN command with the proper tlv
297  * for a bunch of channels.
298  */
299 static int lbs_do_scan(struct lbs_private *priv, uint8_t bsstype,
300                        struct chanscanparamset *chan_list, int chan_count)
301 {
302         int ret = -ENOMEM;
303         struct cmd_ds_802_11_scan *scan_cmd;
304         uint8_t *tlv;   /* pointer into our current, growing TLV storage area */
305
306         lbs_deb_enter_args(LBS_DEB_SCAN, "bsstype %d, chanlist[].chan %d, chan_count %d",
307                 bsstype, chan_list ? chan_list[0].channumber : -1,
308                 chan_count);
309
310         /* create the fixed part for scan command */
311         scan_cmd = kzalloc(MAX_SCAN_CFG_ALLOC, GFP_KERNEL);
312         if (scan_cmd == NULL)
313                 goto out;
314
315         tlv = scan_cmd->tlvbuffer;
316         /* TODO: do we need to scan for a specific BSSID?
317         memcpy(scan_cmd->bssid, priv->scan_bssid, ETH_ALEN); */
318         scan_cmd->bsstype = bsstype;
319
320         /* add TLVs */
321         if (priv->scan_ssid_len)
322                 tlv += lbs_scan_add_ssid_tlv(priv, tlv);
323         if (chan_list && chan_count)
324                 tlv += lbs_scan_add_chanlist_tlv(tlv, chan_list, chan_count);
325         tlv += lbs_scan_add_rates_tlv(tlv);
326
327         /* This is the final data we are about to send */
328         scan_cmd->hdr.size = cpu_to_le16(tlv - (uint8_t *)scan_cmd);
329         lbs_deb_hex(LBS_DEB_SCAN, "SCAN_CMD", (void *)scan_cmd,
330                     sizeof(*scan_cmd));
331         lbs_deb_hex(LBS_DEB_SCAN, "SCAN_TLV", scan_cmd->tlvbuffer,
332                     tlv - scan_cmd->tlvbuffer);
333
334         ret = __lbs_cmd(priv, CMD_802_11_SCAN, &scan_cmd->hdr,
335                         le16_to_cpu(scan_cmd->hdr.size),
336                         lbs_ret_80211_scan, 0);
337
338 out:
339         kfree(scan_cmd);
340         lbs_deb_leave_args(LBS_DEB_SCAN, "ret %d", ret);
341         return ret;
342 }
343
344 /**
345  *  @brief Internal function used to start a scan based on an input config
346  *
347  *  Use the input user scan configuration information when provided in
348  *    order to send the appropriate scan commands to firmware to populate or
349  *    update the internal driver scan table
350  *
351  *  @param priv          A pointer to struct lbs_private structure
352  *  @param full_scan     Do a full-scan (blocking)
353  *
354  *  @return              0 or < 0 if error
355  */
356 int lbs_scan_networks(struct lbs_private *priv, int full_scan)
357 {
358         int ret = -ENOMEM;
359         struct chanscanparamset *chan_list;
360         struct chanscanparamset *curr_chans;
361         int chan_count;
362         uint8_t bsstype = CMD_BSS_TYPE_ANY;
363         int numchannels = MRVDRV_CHANNELS_PER_SCAN_CMD;
364         union iwreq_data wrqu;
365 #ifdef CONFIG_LIBERTAS_DEBUG
366         struct bss_descriptor *iter;
367         int i = 0;
368         DECLARE_SSID_BUF(ssid);
369 #endif
370
371         lbs_deb_enter_args(LBS_DEB_SCAN, "full_scan %d", full_scan);
372
373         /* Cancel any partial outstanding partial scans if this scan
374          * is a full scan.
375          */
376         if (full_scan && delayed_work_pending(&priv->scan_work))
377                 cancel_delayed_work(&priv->scan_work);
378
379         /* User-specified bsstype or channel list
380         TODO: this can be implemented if some user-space application
381         need the feature. Formerly, it was accessible from debugfs,
382         but then nowhere used.
383         if (user_cfg) {
384                 if (user_cfg->bsstype)
385                 bsstype = user_cfg->bsstype;
386         } */
387
388         lbs_deb_scan("numchannels %d, bsstype %d\n", numchannels, bsstype);
389
390         /* Create list of channels to scan */
391         chan_list = kzalloc(sizeof(struct chanscanparamset) *
392                             LBS_IOCTL_USER_SCAN_CHAN_MAX, GFP_KERNEL);
393         if (!chan_list) {
394                 lbs_pr_alert("SCAN: chan_list empty\n");
395                 goto out;
396         }
397
398         /* We want to scan all channels */
399         chan_count = lbs_scan_create_channel_list(priv, chan_list);
400
401         netif_stop_queue(priv->dev);
402         netif_carrier_off(priv->dev);
403         if (priv->mesh_dev) {
404                 netif_stop_queue(priv->mesh_dev);
405                 netif_carrier_off(priv->mesh_dev);
406         }
407
408         /* Prepare to continue an interrupted scan */
409         lbs_deb_scan("chan_count %d, scan_channel %d\n",
410                      chan_count, priv->scan_channel);
411         curr_chans = chan_list;
412         /* advance channel list by already-scanned-channels */
413         if (priv->scan_channel > 0) {
414                 curr_chans += priv->scan_channel;
415                 chan_count -= priv->scan_channel;
416         }
417
418         /* Send scan command(s)
419          * numchannels contains the number of channels we should maximally scan
420          * chan_count is the total number of channels to scan
421          */
422
423         while (chan_count) {
424                 int to_scan = min(numchannels, chan_count);
425                 lbs_deb_scan("scanning %d of %d channels\n",
426                              to_scan, chan_count);
427                 ret = lbs_do_scan(priv, bsstype, curr_chans,
428                                   to_scan);
429                 if (ret) {
430                         lbs_pr_err("SCAN_CMD failed\n");
431                         goto out2;
432                 }
433                 curr_chans += to_scan;
434                 chan_count -= to_scan;
435
436                 /* somehow schedule the next part of the scan */
437                 if (chan_count && !full_scan &&
438                     !priv->surpriseremoved) {
439                         /* -1 marks just that we're currently scanning */
440                         if (priv->scan_channel < 0)
441                                 priv->scan_channel = to_scan;
442                         else
443                                 priv->scan_channel += to_scan;
444                         cancel_delayed_work(&priv->scan_work);
445                         queue_delayed_work(priv->work_thread, &priv->scan_work,
446                                            msecs_to_jiffies(300));
447                         /* skip over GIWSCAN event */
448                         goto out;
449                 }
450
451         }
452         memset(&wrqu, 0, sizeof(union iwreq_data));
453         wireless_send_event(priv->dev, SIOCGIWSCAN, &wrqu, NULL);
454
455 #ifdef CONFIG_LIBERTAS_DEBUG
456         /* Dump the scan table */
457         mutex_lock(&priv->lock);
458         lbs_deb_scan("scan table:\n");
459         list_for_each_entry(iter, &priv->network_list, list)
460                 lbs_deb_scan("%02d: BSSID %pM, RSSI %d, SSID '%s'\n",
461                              i++, iter->bssid, iter->rssi,
462                              print_ssid(ssid, iter->ssid, iter->ssid_len));
463         mutex_unlock(&priv->lock);
464 #endif
465
466 out2:
467         priv->scan_channel = 0;
468
469 out:
470         if (priv->connect_status == LBS_CONNECTED) {
471                 netif_carrier_on(priv->dev);
472                 if (!priv->tx_pending_len)
473                         netif_wake_queue(priv->dev);
474         }
475         if (priv->mesh_dev && (priv->mesh_connect_status == LBS_CONNECTED)) {
476                 netif_carrier_on(priv->mesh_dev);
477                 if (!priv->tx_pending_len)
478                         netif_wake_queue(priv->mesh_dev);
479         }
480         kfree(chan_list);
481
482         lbs_deb_leave_args(LBS_DEB_SCAN, "ret %d", ret);
483         return ret;
484 }
485
486 void lbs_scan_worker(struct work_struct *work)
487 {
488         struct lbs_private *priv =
489                 container_of(work, struct lbs_private, scan_work.work);
490
491         lbs_deb_enter(LBS_DEB_SCAN);
492         lbs_scan_networks(priv, 0);
493         lbs_deb_leave(LBS_DEB_SCAN);
494 }
495
496
497 /*********************************************************************/
498 /*                                                                   */
499 /*  Result interpretation                                            */
500 /*                                                                   */
501 /*********************************************************************/
502
503 /**
504  *  @brief Interpret a BSS scan response returned from the firmware
505  *
506  *  Parse the various fixed fields and IEs passed back for a a BSS probe
507  *  response or beacon from the scan command.  Record information as needed
508  *  in the scan table struct bss_descriptor for that entry.
509  *
510  *  @param bss  Output parameter: Pointer to the BSS Entry
511  *
512  *  @return             0 or -1
513  */
514 static int lbs_process_bss(struct bss_descriptor *bss,
515                            uint8_t **pbeaconinfo, int *bytesleft)
516 {
517         struct ieee_ie_fh_param_set *fh;
518         struct ieee_ie_ds_param_set *ds;
519         struct ieee_ie_cf_param_set *cf;
520         struct ieee_ie_ibss_param_set *ibss;
521         DECLARE_SSID_BUF(ssid);
522         struct ieee_ie_country_info_set *pcountryinfo;
523         uint8_t *pos, *end, *p;
524         uint8_t n_ex_rates = 0, got_basic_rates = 0, n_basic_rates = 0;
525         uint16_t beaconsize = 0;
526         int ret;
527
528         lbs_deb_enter(LBS_DEB_SCAN);
529
530         if (*bytesleft >= sizeof(beaconsize)) {
531                 /* Extract & convert beacon size from the command buffer */
532                 beaconsize = get_unaligned_le16(*pbeaconinfo);
533                 *bytesleft -= sizeof(beaconsize);
534                 *pbeaconinfo += sizeof(beaconsize);
535         }
536
537         if (beaconsize == 0 || beaconsize > *bytesleft) {
538                 *pbeaconinfo += *bytesleft;
539                 *bytesleft = 0;
540                 ret = -1;
541                 goto done;
542         }
543
544         /* Initialize the current working beacon pointer for this BSS iteration */
545         pos = *pbeaconinfo;
546         end = pos + beaconsize;
547
548         /* Advance the return beacon pointer past the current beacon */
549         *pbeaconinfo += beaconsize;
550         *bytesleft -= beaconsize;
551
552         memcpy(bss->bssid, pos, ETH_ALEN);
553         lbs_deb_scan("process_bss: BSSID %pM\n", bss->bssid);
554         pos += ETH_ALEN;
555
556         if ((end - pos) < 12) {
557                 lbs_deb_scan("process_bss: Not enough bytes left\n");
558                 ret = -1;
559                 goto done;
560         }
561
562         /*
563          * next 4 fields are RSSI, time stamp, beacon interval,
564          *   and capability information
565          */
566
567         /* RSSI is 1 byte long */
568         bss->rssi = *pos;
569         lbs_deb_scan("process_bss: RSSI %d\n", *pos);
570         pos++;
571
572         /* time stamp is 8 bytes long */
573         pos += 8;
574
575         /* beacon interval is 2 bytes long */
576         bss->beaconperiod = get_unaligned_le16(pos);
577         pos += 2;
578
579         /* capability information is 2 bytes long */
580         bss->capability = get_unaligned_le16(pos);
581         lbs_deb_scan("process_bss: capabilities 0x%04x\n", bss->capability);
582         pos += 2;
583
584         if (bss->capability & WLAN_CAPABILITY_PRIVACY)
585                 lbs_deb_scan("process_bss: WEP enabled\n");
586         if (bss->capability & WLAN_CAPABILITY_IBSS)
587                 bss->mode = IW_MODE_ADHOC;
588         else
589                 bss->mode = IW_MODE_INFRA;
590
591         /* rest of the current buffer are IE's */
592         lbs_deb_scan("process_bss: IE len %zd\n", end - pos);
593         lbs_deb_hex(LBS_DEB_SCAN, "process_bss: IE info", pos, end - pos);
594
595         /* process variable IE */
596         while (pos <= end - 2) {
597                 if (pos + pos[1] > end) {
598                         lbs_deb_scan("process_bss: error in processing IE, "
599                                      "bytes left < IE length\n");
600                         break;
601                 }
602
603                 switch (pos[0]) {
604                 case WLAN_EID_SSID:
605                         bss->ssid_len = min_t(int, IEEE80211_MAX_SSID_LEN, pos[1]);
606                         memcpy(bss->ssid, pos + 2, bss->ssid_len);
607                         lbs_deb_scan("got SSID IE: '%s', len %u\n",
608                                      print_ssid(ssid, bss->ssid, bss->ssid_len),
609                                      bss->ssid_len);
610                         break;
611
612                 case WLAN_EID_SUPP_RATES:
613                         n_basic_rates = min_t(uint8_t, MAX_RATES, pos[1]);
614                         memcpy(bss->rates, pos + 2, n_basic_rates);
615                         got_basic_rates = 1;
616                         lbs_deb_scan("got RATES IE\n");
617                         break;
618
619                 case WLAN_EID_FH_PARAMS:
620                         fh = (struct ieee_ie_fh_param_set *) pos;
621                         memcpy(&bss->phy.fh, fh, sizeof(*fh));
622                         lbs_deb_scan("got FH IE\n");
623                         break;
624
625                 case WLAN_EID_DS_PARAMS:
626                         ds = (struct ieee_ie_ds_param_set *) pos;
627                         bss->channel = ds->channel;
628                         memcpy(&bss->phy.ds, ds, sizeof(*ds));
629                         lbs_deb_scan("got DS IE, channel %d\n", bss->channel);
630                         break;
631
632                 case WLAN_EID_CF_PARAMS:
633                         cf = (struct ieee_ie_cf_param_set *) pos;
634                         memcpy(&bss->ss.cf, cf, sizeof(*cf));
635                         lbs_deb_scan("got CF IE\n");
636                         break;
637
638                 case WLAN_EID_IBSS_PARAMS:
639                         ibss = (struct ieee_ie_ibss_param_set *) pos;
640                         bss->atimwindow = ibss->atimwindow;
641                         memcpy(&bss->ss.ibss, ibss, sizeof(*ibss));
642                         lbs_deb_scan("got IBSS IE\n");
643                         break;
644
645                 case WLAN_EID_COUNTRY:
646                         pcountryinfo = (struct ieee_ie_country_info_set *) pos;
647                         lbs_deb_scan("got COUNTRY IE\n");
648                         if (pcountryinfo->header.len < sizeof(pcountryinfo->countrycode)
649                             || pcountryinfo->header.len > 254) {
650                                 lbs_deb_scan("%s: 11D- Err CountryInfo len %d, min %zd, max 254\n",
651                                              __func__,
652                                              pcountryinfo->header.len,
653                                              sizeof(pcountryinfo->countrycode));
654                                 ret = -1;
655                                 goto done;
656                         }
657
658                         memcpy(&bss->countryinfo, pcountryinfo,
659                                 pcountryinfo->header.len + 2);
660                         lbs_deb_hex(LBS_DEB_SCAN, "process_bss: 11d countryinfo",
661                                     (uint8_t *) pcountryinfo,
662                                     (int) (pcountryinfo->header.len + 2));
663                         break;
664
665                 case WLAN_EID_EXT_SUPP_RATES:
666                         /* only process extended supported rate if data rate is
667                          * already found. Data rate IE should come before
668                          * extended supported rate IE
669                          */
670                         lbs_deb_scan("got RATESEX IE\n");
671                         if (!got_basic_rates) {
672                                 lbs_deb_scan("... but ignoring it\n");
673                                 break;
674                         }
675
676                         n_ex_rates = pos[1];
677                         if (n_basic_rates + n_ex_rates > MAX_RATES)
678                                 n_ex_rates = MAX_RATES - n_basic_rates;
679
680                         p = bss->rates + n_basic_rates;
681                         memcpy(p, pos + 2, n_ex_rates);
682                         break;
683
684                 case WLAN_EID_GENERIC:
685                         if (pos[1] >= 4 &&
686                             pos[2] == 0x00 && pos[3] == 0x50 &&
687                             pos[4] == 0xf2 && pos[5] == 0x01) {
688                                 bss->wpa_ie_len = min(pos[1] + 2, MAX_WPA_IE_LEN);
689                                 memcpy(bss->wpa_ie, pos, bss->wpa_ie_len);
690                                 lbs_deb_scan("got WPA IE\n");
691                                 lbs_deb_hex(LBS_DEB_SCAN, "WPA IE", bss->wpa_ie,
692                                             bss->wpa_ie_len);
693                         } else if (pos[1] >= MARVELL_MESH_IE_LENGTH &&
694                                    pos[2] == 0x00 && pos[3] == 0x50 &&
695                                    pos[4] == 0x43 && pos[5] == 0x04) {
696                                 lbs_deb_scan("got mesh IE\n");
697                                 bss->mesh = 1;
698                         } else {
699                                 lbs_deb_scan("got generic IE: %02x:%02x:%02x:%02x, len %d\n",
700                                         pos[2], pos[3],
701                                         pos[4], pos[5],
702                                         pos[1]);
703                         }
704                         break;
705
706                 case WLAN_EID_RSN:
707                         lbs_deb_scan("got RSN IE\n");
708                         bss->rsn_ie_len = min(pos[1] + 2, MAX_WPA_IE_LEN);
709                         memcpy(bss->rsn_ie, pos, bss->rsn_ie_len);
710                         lbs_deb_hex(LBS_DEB_SCAN, "process_bss: RSN_IE",
711                                     bss->rsn_ie, bss->rsn_ie_len);
712                         break;
713
714                 default:
715                         lbs_deb_scan("got IE 0x%04x, len %d\n",
716                                      pos[0], pos[1]);
717                         break;
718                 }
719
720                 pos += pos[1] + 2;
721         }
722
723         /* Timestamp */
724         bss->last_scanned = jiffies;
725         lbs_unset_basic_rate_flags(bss->rates, sizeof(bss->rates));
726
727         ret = 0;
728
729 done:
730         lbs_deb_leave_args(LBS_DEB_SCAN, "ret %d", ret);
731         return ret;
732 }
733
734 /**
735  *  @brief Send a scan command for all available channels filtered on a spec
736  *
737  *  Used in association code and from debugfs
738  *
739  *  @param priv             A pointer to struct lbs_private structure
740  *  @param ssid             A pointer to the SSID to scan for
741  *  @param ssid_len         Length of the SSID
742  *
743  *  @return                0-success, otherwise fail
744  */
745 int lbs_send_specific_ssid_scan(struct lbs_private *priv, uint8_t *ssid,
746                                 uint8_t ssid_len)
747 {
748         DECLARE_SSID_BUF(ssid_buf);
749         int ret = 0;
750
751         lbs_deb_enter_args(LBS_DEB_SCAN, "SSID '%s'\n",
752                            print_ssid(ssid_buf, ssid, ssid_len));
753
754         if (!ssid_len)
755                 goto out;
756
757         memcpy(priv->scan_ssid, ssid, ssid_len);
758         priv->scan_ssid_len = ssid_len;
759
760         lbs_scan_networks(priv, 1);
761         if (priv->surpriseremoved) {
762                 ret = -1;
763                 goto out;
764         }
765
766 out:
767         lbs_deb_leave_args(LBS_DEB_SCAN, "ret %d", ret);
768         return ret;
769 }
770
771
772
773
774 /*********************************************************************/
775 /*                                                                   */
776 /*  Support for Wireless Extensions                                  */
777 /*                                                                   */
778 /*********************************************************************/
779
780
781 #define MAX_CUSTOM_LEN 64
782
783 static inline char *lbs_translate_scan(struct lbs_private *priv,
784                                             struct iw_request_info *info,
785                                             char *start, char *stop,
786                                             struct bss_descriptor *bss)
787 {
788         struct chan_freq_power *cfp;
789         char *current_val;      /* For rates */
790         struct iw_event iwe;    /* Temporary buffer */
791         int j;
792 #define PERFECT_RSSI ((uint8_t)50)
793 #define WORST_RSSI   ((uint8_t)0)
794 #define RSSI_DIFF    ((uint8_t)(PERFECT_RSSI - WORST_RSSI))
795         uint8_t rssi;
796
797         lbs_deb_enter(LBS_DEB_SCAN);
798
799         cfp = lbs_find_cfp_by_band_and_channel(priv, 0, bss->channel);
800         if (!cfp) {
801                 lbs_deb_scan("Invalid channel number %d\n", bss->channel);
802                 start = NULL;
803                 goto out;
804         }
805
806         /* First entry *MUST* be the BSSID */
807         iwe.cmd = SIOCGIWAP;
808         iwe.u.ap_addr.sa_family = ARPHRD_ETHER;
809         memcpy(iwe.u.ap_addr.sa_data, &bss->bssid, ETH_ALEN);
810         start = iwe_stream_add_event(info, start, stop, &iwe, IW_EV_ADDR_LEN);
811
812         /* SSID */
813         iwe.cmd = SIOCGIWESSID;
814         iwe.u.data.flags = 1;
815         iwe.u.data.length = min((uint32_t) bss->ssid_len, (uint32_t) IW_ESSID_MAX_SIZE);
816         start = iwe_stream_add_point(info, start, stop, &iwe, bss->ssid);
817
818         /* Mode */
819         iwe.cmd = SIOCGIWMODE;
820         iwe.u.mode = bss->mode;
821         start = iwe_stream_add_event(info, start, stop, &iwe, IW_EV_UINT_LEN);
822
823         /* Frequency */
824         iwe.cmd = SIOCGIWFREQ;
825         iwe.u.freq.m = (long)cfp->freq * 100000;
826         iwe.u.freq.e = 1;
827         start = iwe_stream_add_event(info, start, stop, &iwe, IW_EV_FREQ_LEN);
828
829         /* Add quality statistics */
830         iwe.cmd = IWEVQUAL;
831         iwe.u.qual.updated = IW_QUAL_ALL_UPDATED;
832         iwe.u.qual.level = SCAN_RSSI(bss->rssi);
833
834         rssi = iwe.u.qual.level - MRVDRV_NF_DEFAULT_SCAN_VALUE;
835         iwe.u.qual.qual =
836                 (100 * RSSI_DIFF * RSSI_DIFF - (PERFECT_RSSI - rssi) *
837                  (15 * (RSSI_DIFF) + 62 * (PERFECT_RSSI - rssi))) /
838                 (RSSI_DIFF * RSSI_DIFF);
839         if (iwe.u.qual.qual > 100)
840                 iwe.u.qual.qual = 100;
841
842         if (priv->NF[TYPE_BEACON][TYPE_NOAVG] == 0) {
843                 iwe.u.qual.noise = MRVDRV_NF_DEFAULT_SCAN_VALUE;
844         } else {
845                 iwe.u.qual.noise = CAL_NF(priv->NF[TYPE_BEACON][TYPE_NOAVG]);
846         }
847
848         /* Locally created ad-hoc BSSs won't have beacons if this is the
849          * only station in the adhoc network; so get signal strength
850          * from receive statistics.
851          */
852         if ((priv->mode == IW_MODE_ADHOC) && priv->adhoccreate
853             && !lbs_ssid_cmp(priv->curbssparams.ssid,
854                              priv->curbssparams.ssid_len,
855                              bss->ssid, bss->ssid_len)) {
856                 int snr, nf;
857                 snr = priv->SNR[TYPE_RXPD][TYPE_AVG] / AVG_SCALE;
858                 nf = priv->NF[TYPE_RXPD][TYPE_AVG] / AVG_SCALE;
859                 iwe.u.qual.level = CAL_RSSI(snr, nf);
860         }
861         start = iwe_stream_add_event(info, start, stop, &iwe, IW_EV_QUAL_LEN);
862
863         /* Add encryption capability */
864         iwe.cmd = SIOCGIWENCODE;
865         if (bss->capability & WLAN_CAPABILITY_PRIVACY) {
866                 iwe.u.data.flags = IW_ENCODE_ENABLED | IW_ENCODE_NOKEY;
867         } else {
868                 iwe.u.data.flags = IW_ENCODE_DISABLED;
869         }
870         iwe.u.data.length = 0;
871         start = iwe_stream_add_point(info, start, stop, &iwe, bss->ssid);
872
873         current_val = start + iwe_stream_lcp_len(info);
874
875         iwe.cmd = SIOCGIWRATE;
876         iwe.u.bitrate.fixed = 0;
877         iwe.u.bitrate.disabled = 0;
878         iwe.u.bitrate.value = 0;
879
880         for (j = 0; j < ARRAY_SIZE(bss->rates) && bss->rates[j]; j++) {
881                 /* Bit rate given in 500 kb/s units */
882                 iwe.u.bitrate.value = bss->rates[j] * 500000;
883                 current_val = iwe_stream_add_value(info, start, current_val,
884                                                    stop, &iwe, IW_EV_PARAM_LEN);
885         }
886         if ((bss->mode == IW_MODE_ADHOC) && priv->adhoccreate
887             && !lbs_ssid_cmp(priv->curbssparams.ssid,
888                              priv->curbssparams.ssid_len,
889                              bss->ssid, bss->ssid_len)) {
890                 iwe.u.bitrate.value = 22 * 500000;
891                 current_val = iwe_stream_add_value(info, start, current_val,
892                                                    stop, &iwe, IW_EV_PARAM_LEN);
893         }
894         /* Check if we added any event */
895         if ((current_val - start) > iwe_stream_lcp_len(info))
896                 start = current_val;
897
898         memset(&iwe, 0, sizeof(iwe));
899         if (bss->wpa_ie_len) {
900                 char buf[MAX_WPA_IE_LEN];
901                 memcpy(buf, bss->wpa_ie, bss->wpa_ie_len);
902                 iwe.cmd = IWEVGENIE;
903                 iwe.u.data.length = bss->wpa_ie_len;
904                 start = iwe_stream_add_point(info, start, stop, &iwe, buf);
905         }
906
907         memset(&iwe, 0, sizeof(iwe));
908         if (bss->rsn_ie_len) {
909                 char buf[MAX_WPA_IE_LEN];
910                 memcpy(buf, bss->rsn_ie, bss->rsn_ie_len);
911                 iwe.cmd = IWEVGENIE;
912                 iwe.u.data.length = bss->rsn_ie_len;
913                 start = iwe_stream_add_point(info, start, stop, &iwe, buf);
914         }
915
916         if (bss->mesh) {
917                 char custom[MAX_CUSTOM_LEN];
918                 char *p = custom;
919
920                 iwe.cmd = IWEVCUSTOM;
921                 p += snprintf(p, MAX_CUSTOM_LEN, "mesh-type: olpc");
922                 iwe.u.data.length = p - custom;
923                 if (iwe.u.data.length)
924                         start = iwe_stream_add_point(info, start, stop,
925                                                      &iwe, custom);
926         }
927
928 out:
929         lbs_deb_leave_args(LBS_DEB_SCAN, "start %p", start);
930         return start;
931 }
932
933
934 /**
935  *  @brief Handle Scan Network ioctl
936  *
937  *  @param dev          A pointer to net_device structure
938  *  @param info         A pointer to iw_request_info structure
939  *  @param vwrq         A pointer to iw_param structure
940  *  @param extra        A pointer to extra data buf
941  *
942  *  @return             0 --success, otherwise fail
943  */
944 int lbs_set_scan(struct net_device *dev, struct iw_request_info *info,
945                  union iwreq_data *wrqu, char *extra)
946 {
947         DECLARE_SSID_BUF(ssid);
948         struct lbs_private *priv = dev->ml_priv;
949         int ret = 0;
950
951         lbs_deb_enter(LBS_DEB_WEXT);
952
953         if (!lbs_is_cmd_allowed(priv)) {
954                 ret = -EBUSY;
955                 goto out;
956         }
957
958         if (!priv->radio_on) {
959                 ret = -EINVAL;
960                 goto out;
961         }
962
963         if (!netif_running(dev)) {
964                 ret = -ENETDOWN;
965                 goto out;
966         }
967
968         /* mac80211 does this:
969         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
970         if (sdata->type != IEEE80211_IF_TYPE_xxx) {
971                 ret = -EOPNOTSUPP;
972                 goto out;
973         }
974         */
975
976         if (wrqu->data.length == sizeof(struct iw_scan_req) &&
977             wrqu->data.flags & IW_SCAN_THIS_ESSID) {
978                 struct iw_scan_req *req = (struct iw_scan_req *)extra;
979                 priv->scan_ssid_len = req->essid_len;
980                 memcpy(priv->scan_ssid, req->essid, priv->scan_ssid_len);
981                 lbs_deb_wext("set_scan, essid '%s'\n",
982                         print_ssid(ssid, priv->scan_ssid, priv->scan_ssid_len));
983         } else {
984                 priv->scan_ssid_len = 0;
985         }
986
987         if (!delayed_work_pending(&priv->scan_work))
988                 queue_delayed_work(priv->work_thread, &priv->scan_work,
989                                    msecs_to_jiffies(50));
990         /* set marker that currently a scan is taking place */
991         priv->scan_channel = -1;
992
993         if (priv->surpriseremoved)
994                 ret = -EIO;
995
996 out:
997         lbs_deb_leave_args(LBS_DEB_WEXT, "ret %d", ret);
998         return ret;
999 }
1000
1001
1002 /**
1003  *  @brief  Handle Retrieve scan table ioctl
1004  *
1005  *  @param dev          A pointer to net_device structure
1006  *  @param info         A pointer to iw_request_info structure
1007  *  @param dwrq         A pointer to iw_point structure
1008  *  @param extra        A pointer to extra data buf
1009  *
1010  *  @return             0 --success, otherwise fail
1011  */
1012 int lbs_get_scan(struct net_device *dev, struct iw_request_info *info,
1013                  struct iw_point *dwrq, char *extra)
1014 {
1015 #define SCAN_ITEM_SIZE 128
1016         struct lbs_private *priv = dev->ml_priv;
1017         int err = 0;
1018         char *ev = extra;
1019         char *stop = ev + dwrq->length;
1020         struct bss_descriptor *iter_bss;
1021         struct bss_descriptor *safe;
1022
1023         lbs_deb_enter(LBS_DEB_WEXT);
1024
1025         if (!lbs_is_cmd_allowed(priv)) {
1026                 err = -EBUSY;
1027                 lbs_deb_leave_args(LBS_DEB_WEXT, "ret %d", err);
1028                 return err;
1029         }
1030
1031         /* iwlist should wait until the current scan is finished */
1032         if (priv->scan_channel)
1033                 return -EAGAIN;
1034
1035         /* Update RSSI if current BSS is a locally created ad-hoc BSS */
1036         if ((priv->mode == IW_MODE_ADHOC) && priv->adhoccreate)
1037                 lbs_prepare_and_send_command(priv, CMD_802_11_RSSI, 0,
1038                                              CMD_OPTION_WAITFORRSP, 0, NULL);
1039
1040         mutex_lock(&priv->lock);
1041         list_for_each_entry_safe (iter_bss, safe, &priv->network_list, list) {
1042                 char *next_ev;
1043                 unsigned long stale_time;
1044
1045                 if (stop - ev < SCAN_ITEM_SIZE) {
1046                         err = -E2BIG;
1047                         break;
1048                 }
1049
1050                 /* For mesh device, list only mesh networks */
1051                 if (dev == priv->mesh_dev && !iter_bss->mesh)
1052                         continue;
1053
1054                 /* Prune old an old scan result */
1055                 stale_time = iter_bss->last_scanned + DEFAULT_MAX_SCAN_AGE;
1056                 if (time_after(jiffies, stale_time)) {
1057                         list_move_tail(&iter_bss->list, &priv->network_free_list);
1058                         clear_bss_descriptor(iter_bss);
1059                         continue;
1060                 }
1061
1062                 /* Translate to WE format this entry */
1063                 next_ev = lbs_translate_scan(priv, info, ev, stop, iter_bss);
1064                 if (next_ev == NULL)
1065                         continue;
1066                 ev = next_ev;
1067         }
1068         mutex_unlock(&priv->lock);
1069
1070         dwrq->length = (ev - extra);
1071         dwrq->flags = 0;
1072
1073         lbs_deb_leave_args(LBS_DEB_WEXT, "ret %d", err);
1074         return err;
1075 }
1076
1077
1078
1079
1080 /*********************************************************************/
1081 /*                                                                   */
1082 /*  Command execution                                                */
1083 /*                                                                   */
1084 /*********************************************************************/
1085
1086
1087 /**
1088  *  @brief This function handles the command response of scan
1089  *
1090  *  Called from handle_cmd_response() in cmdrespc.
1091  *
1092  *   The response buffer for the scan command has the following
1093  *      memory layout:
1094  *
1095  *     .-----------------------------------------------------------.
1096  *     |  header (4 * sizeof(u16)):  Standard command response hdr |
1097  *     .-----------------------------------------------------------.
1098  *     |  bufsize (u16) : sizeof the BSS Description data          |
1099  *     .-----------------------------------------------------------.
1100  *     |  NumOfSet (u8) : Number of BSS Descs returned             |
1101  *     .-----------------------------------------------------------.
1102  *     |  BSSDescription data (variable, size given in bufsize)    |
1103  *     .-----------------------------------------------------------.
1104  *     |  TLV data (variable, size calculated using header->size,  |
1105  *     |            bufsize and sizeof the fixed fields above)     |
1106  *     .-----------------------------------------------------------.
1107  *
1108  *  @param priv    A pointer to struct lbs_private structure
1109  *  @param resp    A pointer to cmd_ds_command
1110  *
1111  *  @return        0 or -1
1112  */
1113 static int lbs_ret_80211_scan(struct lbs_private *priv, unsigned long dummy,
1114                               struct cmd_header *resp)
1115 {
1116         struct cmd_ds_802_11_scan_rsp *scanresp = (void *)resp;
1117         struct bss_descriptor *iter_bss;
1118         struct bss_descriptor *safe;
1119         uint8_t *bssinfo;
1120         uint16_t scanrespsize;
1121         int bytesleft;
1122         int idx;
1123         int tlvbufsize;
1124         int ret;
1125
1126         lbs_deb_enter(LBS_DEB_SCAN);
1127
1128         /* Prune old entries from scan table */
1129         list_for_each_entry_safe (iter_bss, safe, &priv->network_list, list) {
1130                 unsigned long stale_time = iter_bss->last_scanned + DEFAULT_MAX_SCAN_AGE;
1131                 if (time_before(jiffies, stale_time))
1132                         continue;
1133                 list_move_tail (&iter_bss->list, &priv->network_free_list);
1134                 clear_bss_descriptor(iter_bss);
1135         }
1136
1137         if (scanresp->nr_sets > MAX_NETWORK_COUNT) {
1138                 lbs_deb_scan("SCAN_RESP: too many scan results (%d, max %d)\n",
1139                              scanresp->nr_sets, MAX_NETWORK_COUNT);
1140                 ret = -1;
1141                 goto done;
1142         }
1143
1144         bytesleft = get_unaligned_le16(&scanresp->bssdescriptsize);
1145         lbs_deb_scan("SCAN_RESP: bssdescriptsize %d\n", bytesleft);
1146
1147         scanrespsize = le16_to_cpu(resp->size);
1148         lbs_deb_scan("SCAN_RESP: scan results %d\n", scanresp->nr_sets);
1149
1150         bssinfo = scanresp->bssdesc_and_tlvbuffer;
1151
1152         /* The size of the TLV buffer is equal to the entire command response
1153          *   size (scanrespsize) minus the fixed fields (sizeof()'s), the
1154          *   BSS Descriptions (bssdescriptsize as bytesLef) and the command
1155          *   response header (S_DS_GEN)
1156          */
1157         tlvbufsize = scanrespsize - (bytesleft + sizeof(scanresp->bssdescriptsize)
1158                                      + sizeof(scanresp->nr_sets)
1159                                      + S_DS_GEN);
1160
1161         /*
1162          *  Process each scan response returned (scanresp->nr_sets). Save
1163          *    the information in the newbssentry and then insert into the
1164          *    driver scan table either as an update to an existing entry
1165          *    or as an addition at the end of the table
1166          */
1167         for (idx = 0; idx < scanresp->nr_sets && bytesleft; idx++) {
1168                 struct bss_descriptor new;
1169                 struct bss_descriptor *found = NULL;
1170                 struct bss_descriptor *oldest = NULL;
1171
1172                 /* Process the data fields and IEs returned for this BSS */
1173                 memset(&new, 0, sizeof (struct bss_descriptor));
1174                 if (lbs_process_bss(&new, &bssinfo, &bytesleft) != 0) {
1175                         /* error parsing the scan response, skipped */
1176                         lbs_deb_scan("SCAN_RESP: process_bss returned ERROR\n");
1177                         continue;
1178                 }
1179
1180                 /* Try to find this bss in the scan table */
1181                 list_for_each_entry (iter_bss, &priv->network_list, list) {
1182                         if (is_same_network(iter_bss, &new)) {
1183                                 found = iter_bss;
1184                                 break;
1185                         }
1186
1187                         if ((oldest == NULL) ||
1188                             (iter_bss->last_scanned < oldest->last_scanned))
1189                                 oldest = iter_bss;
1190                 }
1191
1192                 if (found) {
1193                         /* found, clear it */
1194                         clear_bss_descriptor(found);
1195                 } else if (!list_empty(&priv->network_free_list)) {
1196                         /* Pull one from the free list */
1197                         found = list_entry(priv->network_free_list.next,
1198                                            struct bss_descriptor, list);
1199                         list_move_tail(&found->list, &priv->network_list);
1200                 } else if (oldest) {
1201                         /* If there are no more slots, expire the oldest */
1202                         found = oldest;
1203                         clear_bss_descriptor(found);
1204                         list_move_tail(&found->list, &priv->network_list);
1205                 } else {
1206                         continue;
1207                 }
1208
1209                 lbs_deb_scan("SCAN_RESP: BSSID %pM\n", new.bssid);
1210
1211                 /* Copy the locally created newbssentry to the scan table */
1212                 memcpy(found, &new, offsetof(struct bss_descriptor, list));
1213         }
1214
1215         ret = 0;
1216
1217 done:
1218         lbs_deb_leave_args(LBS_DEB_SCAN, "ret %d", ret);
1219         return ret;
1220 }