Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi...
[linux-2.6] / 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/etherdevice.h>
9 #include <linux/if_arp.h>
10 #include <asm/unaligned.h>
11 #include <net/lib80211.h>
12
13 #include "host.h"
14 #include "decl.h"
15 #include "dev.h"
16 #include "scan.h"
17 #include "cmd.h"
18
19 //! Approximate amount of data needed to pass a scan result back to iwlist
20 #define MAX_SCAN_CELL_SIZE  (IW_EV_ADDR_LEN             \
21                              + IW_ESSID_MAX_SIZE        \
22                              + IW_EV_UINT_LEN           \
23                              + IW_EV_FREQ_LEN           \
24                              + IW_EV_QUAL_LEN           \
25                              + IW_ESSID_MAX_SIZE        \
26                              + IW_EV_PARAM_LEN          \
27                              + 40)      /* 40 for WPAIE */
28
29 //! Memory needed to store a max sized channel List TLV for a firmware scan
30 #define CHAN_TLV_MAX_SIZE  (sizeof(struct mrvlietypesheader)    \
31                             + (MRVDRV_MAX_CHANNELS_PER_SCAN     \
32                                * sizeof(struct chanscanparamset)))
33
34 //! Memory needed to store a max number/size SSID TLV for a firmware scan
35 #define SSID_TLV_MAX_SIZE  (1 * sizeof(struct mrvlietypes_ssidparamset))
36
37 //! Maximum memory needed for a cmd_ds_802_11_scan with all TLVs at max
38 #define MAX_SCAN_CFG_ALLOC (sizeof(struct cmd_ds_802_11_scan)   \
39                             + CHAN_TLV_MAX_SIZE + SSID_TLV_MAX_SIZE)
40
41 //! The maximum number of channels the firmware can scan per command
42 #define MRVDRV_MAX_CHANNELS_PER_SCAN   14
43
44 /**
45  * @brief Number of channels to scan per firmware scan command issuance.
46  *
47  *  Number restricted to prevent hitting the limit on the amount of scan data
48  *  returned in a single firmware scan command.
49  */
50 #define MRVDRV_CHANNELS_PER_SCAN_CMD   4
51
52 //! Scan time specified in the channel TLV for each channel for passive scans
53 #define MRVDRV_PASSIVE_SCAN_CHAN_TIME  100
54
55 //! Scan time specified in the channel TLV for each channel for active scans
56 #define MRVDRV_ACTIVE_SCAN_CHAN_TIME   100
57
58 #define DEFAULT_MAX_SCAN_AGE (15 * HZ)
59
60 static int lbs_ret_80211_scan(struct lbs_private *priv, unsigned long dummy,
61                               struct cmd_header *resp);
62
63 /*********************************************************************/
64 /*                                                                   */
65 /*  Misc helper functions                                            */
66 /*                                                                   */
67 /*********************************************************************/
68
69 /**
70  *  @brief Unsets the MSB on basic rates
71  *
72  * Scan through an array and unset the MSB for basic data rates.
73  *
74  *  @param rates     buffer of data rates
75  *  @param len       size of buffer
76  */
77 static void lbs_unset_basic_rate_flags(u8 *rates, size_t len)
78 {
79         int i;
80
81         for (i = 0; i < len; i++)
82                 rates[i] &= 0x7f;
83 }
84
85
86 static inline void clear_bss_descriptor(struct bss_descriptor *bss)
87 {
88         /* Don't blow away ->list, just BSS data */
89         memset(bss, 0, offsetof(struct bss_descriptor, list));
90 }
91
92 /**
93  *  @brief Compare two SSIDs
94  *
95  *  @param ssid1    A pointer to ssid to compare
96  *  @param ssid2    A pointer to ssid to compare
97  *
98  *  @return         0: ssid is same, otherwise is different
99  */
100 int lbs_ssid_cmp(uint8_t *ssid1, uint8_t ssid1_len, uint8_t *ssid2,
101                  uint8_t ssid2_len)
102 {
103         if (ssid1_len != ssid2_len)
104                 return -1;
105
106         return memcmp(ssid1, ssid2, ssid1_len);
107 }
108
109 static inline int is_same_network(struct bss_descriptor *src,
110                                   struct bss_descriptor *dst)
111 {
112         /* A network is only a duplicate if the channel, BSSID, and ESSID
113          * all match.  We treat all <hidden> with the same BSSID and channel
114          * as one network */
115         return ((src->ssid_len == dst->ssid_len) &&
116                 (src->channel == dst->channel) &&
117                 !compare_ether_addr(src->bssid, dst->bssid) &&
118                 !memcmp(src->ssid, dst->ssid, src->ssid_len));
119 }
120
121
122
123
124 /*********************************************************************/
125 /*                                                                   */
126 /*  Main scanning support                                            */
127 /*                                                                   */
128 /*********************************************************************/
129
130 /**
131  *  @brief Create a channel list for the driver to scan based on region info
132  *
133  *  Only used from lbs_scan_setup_scan_config()
134  *
135  *  Use the driver region/band information to construct a comprehensive list
136  *    of channels to scan.  This routine is used for any scan that is not
137  *    provided a specific channel list to scan.
138  *
139  *  @param priv          A pointer to struct lbs_private structure
140  *  @param scanchanlist  Output parameter: resulting channel list to scan
141  *
142  *  @return              void
143  */
144 static int lbs_scan_create_channel_list(struct lbs_private *priv,
145                                         struct chanscanparamset *scanchanlist)
146 {
147         struct region_channel *scanregion;
148         struct chan_freq_power *cfp;
149         int rgnidx;
150         int chanidx;
151         int nextchan;
152         uint8_t scantype;
153
154         chanidx = 0;
155
156         /* Set the default scan type to the user specified type, will later
157          *   be changed to passive on a per channel basis if restricted by
158          *   regulatory requirements (11d or 11h)
159          */
160         scantype = CMD_SCAN_TYPE_ACTIVE;
161
162         for (rgnidx = 0; rgnidx < ARRAY_SIZE(priv->region_channel); rgnidx++) {
163                 if (priv->enable11d && (priv->connect_status != LBS_CONNECTED)
164                     && (priv->mesh_connect_status != LBS_CONNECTED)) {
165                         /* Scan all the supported chan for the first scan */
166                         if (!priv->universal_channel[rgnidx].valid)
167                                 continue;
168                         scanregion = &priv->universal_channel[rgnidx];
169
170                         /* clear the parsed_region_chan for the first scan */
171                         memset(&priv->parsed_region_chan, 0x00,
172                                sizeof(priv->parsed_region_chan));
173                 } else {
174                         if (!priv->region_channel[rgnidx].valid)
175                                 continue;
176                         scanregion = &priv->region_channel[rgnidx];
177                 }
178
179                 for (nextchan = 0; nextchan < scanregion->nrcfp; nextchan++, chanidx++) {
180                         struct chanscanparamset *chan = &scanchanlist[chanidx];
181
182                         cfp = scanregion->CFP + nextchan;
183
184                         if (priv->enable11d)
185                                 scantype = lbs_get_scan_type_11d(cfp->channel,
186                                                                  &priv->parsed_region_chan);
187
188                         if (scanregion->band == BAND_B || scanregion->band == BAND_G)
189                                 chan->radiotype = CMD_SCAN_RADIO_TYPE_BG;
190
191                         if (scantype == CMD_SCAN_TYPE_PASSIVE) {
192                                 chan->maxscantime = cpu_to_le16(MRVDRV_PASSIVE_SCAN_CHAN_TIME);
193                                 chan->chanscanmode.passivescan = 1;
194                         } else {
195                                 chan->maxscantime = cpu_to_le16(MRVDRV_ACTIVE_SCAN_CHAN_TIME);
196                                 chan->chanscanmode.passivescan = 0;
197                         }
198
199                         chan->channumber = cfp->channel;
200                 }
201         }
202         return chanidx;
203 }
204
205 /*
206  * Add SSID TLV of the form:
207  *
208  * TLV-ID SSID     00 00
209  * length          06 00
210  * ssid            4d 4e 54 45 53 54
211  */
212 static int lbs_scan_add_ssid_tlv(struct lbs_private *priv, u8 *tlv)
213 {
214         struct mrvlietypes_ssidparamset *ssid_tlv = (void *)tlv;
215
216         ssid_tlv->header.type = cpu_to_le16(TLV_TYPE_SSID);
217         ssid_tlv->header.len = cpu_to_le16(priv->scan_ssid_len);
218         memcpy(ssid_tlv->ssid, priv->scan_ssid, priv->scan_ssid_len);
219         return sizeof(ssid_tlv->header) + priv->scan_ssid_len;
220 }
221
222 /*
223  * Add CHANLIST TLV of the form
224  *
225  * TLV-ID CHANLIST 01 01
226  * length          5b 00
227  * channel 1       00 01 00 00 00 64 00
228  *   radio type    00
229  *   channel          01
230  *   scan type           00
231  *   min scan time          00 00
232  *   max scan time                64 00
233  * channel 2       00 02 00 00 00 64 00
234  * channel 3       00 03 00 00 00 64 00
235  * channel 4       00 04 00 00 00 64 00
236  * channel 5       00 05 00 00 00 64 00
237  * channel 6       00 06 00 00 00 64 00
238  * channel 7       00 07 00 00 00 64 00
239  * channel 8       00 08 00 00 00 64 00
240  * channel 9       00 09 00 00 00 64 00
241  * channel 10      00 0a 00 00 00 64 00
242  * channel 11      00 0b 00 00 00 64 00
243  * channel 12      00 0c 00 00 00 64 00
244  * channel 13      00 0d 00 00 00 64 00
245  *
246  */
247 static int lbs_scan_add_chanlist_tlv(uint8_t *tlv,
248                                      struct chanscanparamset *chan_list,
249                                      int chan_count)
250 {
251         size_t size = sizeof(struct chanscanparamset) *chan_count;
252         struct mrvlietypes_chanlistparamset *chan_tlv = (void *)tlv;
253
254         chan_tlv->header.type = cpu_to_le16(TLV_TYPE_CHANLIST);
255         memcpy(chan_tlv->chanscanparam, chan_list, size);
256         chan_tlv->header.len = cpu_to_le16(size);
257         return sizeof(chan_tlv->header) + size;
258 }
259
260 /*
261  * Add RATES TLV of the form
262  *
263  * TLV-ID RATES    01 00
264  * length          0e 00
265  * rates           82 84 8b 96 0c 12 18 24 30 48 60 6c
266  *
267  * The rates are in lbs_bg_rates[], but for the 802.11b
268  * rates the high bit isn't set.
269  */
270 static int lbs_scan_add_rates_tlv(uint8_t *tlv)
271 {
272         int i;
273         struct mrvlietypes_ratesparamset *rate_tlv = (void *)tlv;
274
275         rate_tlv->header.type = cpu_to_le16(TLV_TYPE_RATES);
276         tlv += sizeof(rate_tlv->header);
277         for (i = 0; i < MAX_RATES; i++) {
278                 *tlv = lbs_bg_rates[i];
279                 if (*tlv == 0)
280                         break;
281                 /* This code makes sure that the 802.11b rates (1 MBit/s, 2
282                    MBit/s, 5.5 MBit/s and 11 MBit/s get's the high bit set.
283                    Note that the values are MBit/s * 2, to mark them as
284                    basic rates so that the firmware likes it better */
285                 if (*tlv == 0x02 || *tlv == 0x04 ||
286                     *tlv == 0x0b || *tlv == 0x16)
287                         *tlv |= 0x80;
288                 tlv++;
289         }
290         rate_tlv->header.len = cpu_to_le16(i);
291         return sizeof(rate_tlv->header) + i;
292 }
293
294 /*
295  * Generate the CMD_802_11_SCAN command with the proper tlv
296  * for a bunch of channels.
297  */
298 static int lbs_do_scan(struct lbs_private *priv, uint8_t bsstype,
299                        struct chanscanparamset *chan_list, int chan_count)
300 {
301         int ret = -ENOMEM;
302         struct cmd_ds_802_11_scan *scan_cmd;
303         uint8_t *tlv;   /* pointer into our current, growing TLV storage area */
304
305         lbs_deb_enter_args(LBS_DEB_SCAN, "bsstype %d, chanlist[].chan %d, chan_count %d",
306                 bsstype, chan_list ? chan_list[0].channumber : -1,
307                 chan_count);
308
309         /* create the fixed part for scan command */
310         scan_cmd = kzalloc(MAX_SCAN_CFG_ALLOC, GFP_KERNEL);
311         if (scan_cmd == NULL)
312                 goto out;
313
314         tlv = scan_cmd->tlvbuffer;
315         /* TODO: do we need to scan for a specific BSSID?
316         memcpy(scan_cmd->bssid, priv->scan_bssid, ETH_ALEN); */
317         scan_cmd->bsstype = bsstype;
318
319         /* add TLVs */
320         if (priv->scan_ssid_len)
321                 tlv += lbs_scan_add_ssid_tlv(priv, tlv);
322         if (chan_list && chan_count)
323                 tlv += lbs_scan_add_chanlist_tlv(tlv, chan_list, chan_count);
324         tlv += lbs_scan_add_rates_tlv(tlv);
325
326         /* This is the final data we are about to send */
327         scan_cmd->hdr.size = cpu_to_le16(tlv - (uint8_t *)scan_cmd);
328         lbs_deb_hex(LBS_DEB_SCAN, "SCAN_CMD", (void *)scan_cmd,
329                     sizeof(*scan_cmd));
330         lbs_deb_hex(LBS_DEB_SCAN, "SCAN_TLV", scan_cmd->tlvbuffer,
331                     tlv - scan_cmd->tlvbuffer);
332
333         ret = __lbs_cmd(priv, CMD_802_11_SCAN, &scan_cmd->hdr,
334                         le16_to_cpu(scan_cmd->hdr.size),
335                         lbs_ret_80211_scan, 0);
336
337 out:
338         kfree(scan_cmd);
339         lbs_deb_leave_args(LBS_DEB_SCAN, "ret %d", ret);
340         return ret;
341 }
342
343 /**
344  *  @brief Internal function used to start a scan based on an input config
345  *
346  *  Use the input user scan configuration information when provided in
347  *    order to send the appropriate scan commands to firmware to populate or
348  *    update the internal driver scan table
349  *
350  *  @param priv          A pointer to struct lbs_private structure
351  *  @param full_scan     Do a full-scan (blocking)
352  *
353  *  @return              0 or < 0 if error
354  */
355 int lbs_scan_networks(struct lbs_private *priv, int full_scan)
356 {
357         int ret = -ENOMEM;
358         struct chanscanparamset *chan_list;
359         struct chanscanparamset *curr_chans;
360         int chan_count;
361         uint8_t bsstype = CMD_BSS_TYPE_ANY;
362         int numchannels = MRVDRV_CHANNELS_PER_SCAN_CMD;
363         union iwreq_data wrqu;
364 #ifdef CONFIG_LIBERTAS_DEBUG
365         struct bss_descriptor *iter;
366         int i = 0;
367         DECLARE_SSID_BUF(ssid);
368 #endif
369
370         lbs_deb_enter_args(LBS_DEB_SCAN, "full_scan %d", full_scan);
371
372         /* Cancel any partial outstanding partial scans if this scan
373          * is a full scan.
374          */
375         if (full_scan && delayed_work_pending(&priv->scan_work))
376                 cancel_delayed_work(&priv->scan_work);
377
378         /* User-specified bsstype or channel list
379         TODO: this can be implemented if some user-space application
380         need the feature. Formerly, it was accessible from debugfs,
381         but then nowhere used.
382         if (user_cfg) {
383                 if (user_cfg->bsstype)
384                 bsstype = user_cfg->bsstype;
385         } */
386
387         lbs_deb_scan("numchannels %d, bsstype %d\n", numchannels, bsstype);
388
389         /* Create list of channels to scan */
390         chan_list = kzalloc(sizeof(struct chanscanparamset) *
391                             LBS_IOCTL_USER_SCAN_CHAN_MAX, GFP_KERNEL);
392         if (!chan_list) {
393                 lbs_pr_alert("SCAN: chan_list empty\n");
394                 goto out;
395         }
396
397         /* We want to scan all channels */
398         chan_count = lbs_scan_create_channel_list(priv, chan_list);
399
400         netif_stop_queue(priv->dev);
401         netif_carrier_off(priv->dev);
402         if (priv->mesh_dev) {
403                 netif_stop_queue(priv->mesh_dev);
404                 netif_carrier_off(priv->mesh_dev);
405         }
406
407         /* Prepare to continue an interrupted scan */
408         lbs_deb_scan("chan_count %d, scan_channel %d\n",
409                      chan_count, priv->scan_channel);
410         curr_chans = chan_list;
411         /* advance channel list by already-scanned-channels */
412         if (priv->scan_channel > 0) {
413                 curr_chans += priv->scan_channel;
414                 chan_count -= priv->scan_channel;
415         }
416
417         /* Send scan command(s)
418          * numchannels contains the number of channels we should maximally scan
419          * chan_count is the total number of channels to scan
420          */
421
422         while (chan_count) {
423                 int to_scan = min(numchannels, chan_count);
424                 lbs_deb_scan("scanning %d of %d channels\n",
425                              to_scan, chan_count);
426                 ret = lbs_do_scan(priv, bsstype, curr_chans,
427                                   to_scan);
428                 if (ret) {
429                         lbs_pr_err("SCAN_CMD failed\n");
430                         goto out2;
431                 }
432                 curr_chans += to_scan;
433                 chan_count -= to_scan;
434
435                 /* somehow schedule the next part of the scan */
436                 if (chan_count && !full_scan &&
437                     !priv->surpriseremoved) {
438                         /* -1 marks just that we're currently scanning */
439                         if (priv->scan_channel < 0)
440                                 priv->scan_channel = to_scan;
441                         else
442                                 priv->scan_channel += to_scan;
443                         cancel_delayed_work(&priv->scan_work);
444                         queue_delayed_work(priv->work_thread, &priv->scan_work,
445                                            msecs_to_jiffies(300));
446                         /* skip over GIWSCAN event */
447                         goto out;
448                 }
449
450         }
451         memset(&wrqu, 0, sizeof(union iwreq_data));
452         wireless_send_event(priv->dev, SIOCGIWSCAN, &wrqu, NULL);
453
454 #ifdef CONFIG_LIBERTAS_DEBUG
455         /* Dump the scan table */
456         mutex_lock(&priv->lock);
457         lbs_deb_scan("scan table:\n");
458         list_for_each_entry(iter, &priv->network_list, list)
459                 lbs_deb_scan("%02d: BSSID %pM, RSSI %d, SSID '%s'\n",
460                              i++, iter->bssid, iter->rssi,
461                              print_ssid(ssid, iter->ssid, iter->ssid_len));
462         mutex_unlock(&priv->lock);
463 #endif
464
465 out2:
466         priv->scan_channel = 0;
467
468 out:
469         if (priv->connect_status == LBS_CONNECTED) {
470                 netif_carrier_on(priv->dev);
471                 if (!priv->tx_pending_len)
472                         netif_wake_queue(priv->dev);
473         }
474         if (priv->mesh_dev && (priv->mesh_connect_status == LBS_CONNECTED)) {
475                 netif_carrier_on(priv->mesh_dev);
476                 if (!priv->tx_pending_len)
477                         netif_wake_queue(priv->mesh_dev);
478         }
479         kfree(chan_list);
480
481         lbs_deb_leave_args(LBS_DEB_SCAN, "ret %d", ret);
482         return ret;
483 }
484
485 void lbs_scan_worker(struct work_struct *work)
486 {
487         struct lbs_private *priv =
488                 container_of(work, struct lbs_private, scan_work.work);
489
490         lbs_deb_enter(LBS_DEB_SCAN);
491         lbs_scan_networks(priv, 0);
492         lbs_deb_leave(LBS_DEB_SCAN);
493 }
494
495
496 /*********************************************************************/
497 /*                                                                   */
498 /*  Result interpretation                                            */
499 /*                                                                   */
500 /*********************************************************************/
501
502 /**
503  *  @brief Interpret a BSS scan response returned from the firmware
504  *
505  *  Parse the various fixed fields and IEs passed back for a a BSS probe
506  *  response or beacon from the scan command.  Record information as needed
507  *  in the scan table struct bss_descriptor for that entry.
508  *
509  *  @param bss  Output parameter: Pointer to the BSS Entry
510  *
511  *  @return             0 or -1
512  */
513 static int lbs_process_bss(struct bss_descriptor *bss,
514                            uint8_t **pbeaconinfo, int *bytesleft)
515 {
516         struct ieeetypes_fhparamset *pFH;
517         struct ieeetypes_dsparamset *pDS;
518         struct ieeetypes_cfparamset *pCF;
519         struct ieeetypes_ibssparamset *pibss;
520         DECLARE_SSID_BUF(ssid);
521         struct ieeetypes_countryinfoset *pcountryinfo;
522         uint8_t *pos, *end, *p;
523         uint8_t n_ex_rates = 0, got_basic_rates = 0, n_basic_rates = 0;
524         uint16_t beaconsize = 0;
525         int ret;
526
527         lbs_deb_enter(LBS_DEB_SCAN);
528
529         if (*bytesleft >= sizeof(beaconsize)) {
530                 /* Extract & convert beacon size from the command buffer */
531                 beaconsize = get_unaligned_le16(*pbeaconinfo);
532                 *bytesleft -= sizeof(beaconsize);
533                 *pbeaconinfo += sizeof(beaconsize);
534         }
535
536         if (beaconsize == 0 || beaconsize > *bytesleft) {
537                 *pbeaconinfo += *bytesleft;
538                 *bytesleft = 0;
539                 ret = -1;
540                 goto done;
541         }
542
543         /* Initialize the current working beacon pointer for this BSS iteration */
544         pos = *pbeaconinfo;
545         end = pos + beaconsize;
546
547         /* Advance the return beacon pointer past the current beacon */
548         *pbeaconinfo += beaconsize;
549         *bytesleft -= beaconsize;
550
551         memcpy(bss->bssid, pos, ETH_ALEN);
552         lbs_deb_scan("process_bss: BSSID %pM\n", bss->bssid);
553         pos += ETH_ALEN;
554
555         if ((end - pos) < 12) {
556                 lbs_deb_scan("process_bss: Not enough bytes left\n");
557                 ret = -1;
558                 goto done;
559         }
560
561         /*
562          * next 4 fields are RSSI, time stamp, beacon interval,
563          *   and capability information
564          */
565
566         /* RSSI is 1 byte long */
567         bss->rssi = *pos;
568         lbs_deb_scan("process_bss: RSSI %d\n", *pos);
569         pos++;
570
571         /* time stamp is 8 bytes long */
572         pos += 8;
573
574         /* beacon interval is 2 bytes long */
575         bss->beaconperiod = get_unaligned_le16(pos);
576         pos += 2;
577
578         /* capability information is 2 bytes long */
579         bss->capability = get_unaligned_le16(pos);
580         lbs_deb_scan("process_bss: capabilities 0x%04x\n", bss->capability);
581         pos += 2;
582
583         if (bss->capability & WLAN_CAPABILITY_PRIVACY)
584                 lbs_deb_scan("process_bss: WEP enabled\n");
585         if (bss->capability & WLAN_CAPABILITY_IBSS)
586                 bss->mode = IW_MODE_ADHOC;
587         else
588                 bss->mode = IW_MODE_INFRA;
589
590         /* rest of the current buffer are IE's */
591         lbs_deb_scan("process_bss: IE len %zd\n", end - pos);
592         lbs_deb_hex(LBS_DEB_SCAN, "process_bss: IE info", pos, end - pos);
593
594         /* process variable IE */
595         while (pos <= end - 2) {
596                 if (pos + pos[1] > end) {
597                         lbs_deb_scan("process_bss: error in processing IE, "
598                                      "bytes left < IE length\n");
599                         break;
600                 }
601
602                 switch (pos[0]) {
603                 case WLAN_EID_SSID:
604                         bss->ssid_len = min_t(int, IEEE80211_MAX_SSID_LEN, pos[1]);
605                         memcpy(bss->ssid, pos + 2, bss->ssid_len);
606                         lbs_deb_scan("got SSID IE: '%s', len %u\n",
607                                      print_ssid(ssid, bss->ssid, bss->ssid_len),
608                                      bss->ssid_len);
609                         break;
610
611                 case WLAN_EID_SUPP_RATES:
612                         n_basic_rates = min_t(uint8_t, MAX_RATES, pos[1]);
613                         memcpy(bss->rates, pos + 2, n_basic_rates);
614                         got_basic_rates = 1;
615                         lbs_deb_scan("got RATES IE\n");
616                         break;
617
618                 case WLAN_EID_FH_PARAMS:
619                         pFH = (struct ieeetypes_fhparamset *) pos;
620                         memmove(&bss->phyparamset.fhparamset, pFH,
621                                 sizeof(struct ieeetypes_fhparamset));
622                         lbs_deb_scan("got FH IE\n");
623                         break;
624
625                 case WLAN_EID_DS_PARAMS:
626                         pDS = (struct ieeetypes_dsparamset *) pos;
627                         bss->channel = pDS->currentchan;
628                         memcpy(&bss->phyparamset.dsparamset, pDS,
629                                sizeof(struct ieeetypes_dsparamset));
630                         lbs_deb_scan("got DS IE, channel %d\n", bss->channel);
631                         break;
632
633                 case WLAN_EID_CF_PARAMS:
634                         pCF = (struct ieeetypes_cfparamset *) pos;
635                         memcpy(&bss->ssparamset.cfparamset, pCF,
636                                sizeof(struct ieeetypes_cfparamset));
637                         lbs_deb_scan("got CF IE\n");
638                         break;
639
640                 case WLAN_EID_IBSS_PARAMS:
641                         pibss = (struct ieeetypes_ibssparamset *) pos;
642                         bss->atimwindow = le16_to_cpu(pibss->atimwindow);
643                         memmove(&bss->ssparamset.ibssparamset, pibss,
644                                 sizeof(struct ieeetypes_ibssparamset));
645                         lbs_deb_scan("got IBSS IE\n");
646                         break;
647
648                 case WLAN_EID_COUNTRY:
649                         pcountryinfo = (struct ieeetypes_countryinfoset *) pos;
650                         lbs_deb_scan("got COUNTRY IE\n");
651                         if (pcountryinfo->len < sizeof(pcountryinfo->countrycode)
652                             || pcountryinfo->len > 254) {
653                                 lbs_deb_scan("process_bss: 11D- Err CountryInfo len %d, min %zd, max 254\n",
654                                              pcountryinfo->len, sizeof(pcountryinfo->countrycode));
655                                 ret = -1;
656                                 goto done;
657                         }
658
659                         memcpy(&bss->countryinfo, pcountryinfo, pcountryinfo->len + 2);
660                         lbs_deb_hex(LBS_DEB_SCAN, "process_bss: 11d countryinfo",
661                                     (uint8_t *) pcountryinfo,
662                                     (int) (pcountryinfo->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[4] == 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; bss->rates[j] && (j < sizeof(bss->rates)); 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 = netdev_priv(dev);
949         int ret = 0;
950
951         lbs_deb_enter(LBS_DEB_WEXT);
952
953         if (!priv->radio_on) {
954                 ret = -EINVAL;
955                 goto out;
956         }
957
958         if (!netif_running(dev)) {
959                 ret = -ENETDOWN;
960                 goto out;
961         }
962
963         /* mac80211 does this:
964         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
965         if (sdata->type != IEEE80211_IF_TYPE_xxx) {
966                 ret = -EOPNOTSUPP;
967                 goto out;
968         }
969         */
970
971         if (wrqu->data.length == sizeof(struct iw_scan_req) &&
972             wrqu->data.flags & IW_SCAN_THIS_ESSID) {
973                 struct iw_scan_req *req = (struct iw_scan_req *)extra;
974                 priv->scan_ssid_len = req->essid_len;
975                 memcpy(priv->scan_ssid, req->essid, priv->scan_ssid_len);
976                 lbs_deb_wext("set_scan, essid '%s'\n",
977                         print_ssid(ssid, priv->scan_ssid, priv->scan_ssid_len));
978         } else {
979                 priv->scan_ssid_len = 0;
980         }
981
982         if (!delayed_work_pending(&priv->scan_work))
983                 queue_delayed_work(priv->work_thread, &priv->scan_work,
984                                    msecs_to_jiffies(50));
985         /* set marker that currently a scan is taking place */
986         priv->scan_channel = -1;
987
988         if (priv->surpriseremoved)
989                 ret = -EIO;
990
991 out:
992         lbs_deb_leave_args(LBS_DEB_WEXT, "ret %d", ret);
993         return ret;
994 }
995
996
997 /**
998  *  @brief  Handle Retrieve scan table ioctl
999  *
1000  *  @param dev          A pointer to net_device structure
1001  *  @param info         A pointer to iw_request_info structure
1002  *  @param dwrq         A pointer to iw_point structure
1003  *  @param extra        A pointer to extra data buf
1004  *
1005  *  @return             0 --success, otherwise fail
1006  */
1007 int lbs_get_scan(struct net_device *dev, struct iw_request_info *info,
1008                  struct iw_point *dwrq, char *extra)
1009 {
1010 #define SCAN_ITEM_SIZE 128
1011         struct lbs_private *priv = netdev_priv(dev);
1012         int err = 0;
1013         char *ev = extra;
1014         char *stop = ev + dwrq->length;
1015         struct bss_descriptor *iter_bss;
1016         struct bss_descriptor *safe;
1017
1018         lbs_deb_enter(LBS_DEB_WEXT);
1019
1020         /* iwlist should wait until the current scan is finished */
1021         if (priv->scan_channel)
1022                 return -EAGAIN;
1023
1024         /* Update RSSI if current BSS is a locally created ad-hoc BSS */
1025         if ((priv->mode == IW_MODE_ADHOC) && priv->adhoccreate)
1026                 lbs_prepare_and_send_command(priv, CMD_802_11_RSSI, 0,
1027                                              CMD_OPTION_WAITFORRSP, 0, NULL);
1028
1029         mutex_lock(&priv->lock);
1030         list_for_each_entry_safe (iter_bss, safe, &priv->network_list, list) {
1031                 char *next_ev;
1032                 unsigned long stale_time;
1033
1034                 if (stop - ev < SCAN_ITEM_SIZE) {
1035                         err = -E2BIG;
1036                         break;
1037                 }
1038
1039                 /* For mesh device, list only mesh networks */
1040                 if (dev == priv->mesh_dev && !iter_bss->mesh)
1041                         continue;
1042
1043                 /* Prune old an old scan result */
1044                 stale_time = iter_bss->last_scanned + DEFAULT_MAX_SCAN_AGE;
1045                 if (time_after(jiffies, stale_time)) {
1046                         list_move_tail(&iter_bss->list, &priv->network_free_list);
1047                         clear_bss_descriptor(iter_bss);
1048                         continue;
1049                 }
1050
1051                 /* Translate to WE format this entry */
1052                 next_ev = lbs_translate_scan(priv, info, ev, stop, iter_bss);
1053                 if (next_ev == NULL)
1054                         continue;
1055                 ev = next_ev;
1056         }
1057         mutex_unlock(&priv->lock);
1058
1059         dwrq->length = (ev - extra);
1060         dwrq->flags = 0;
1061
1062         lbs_deb_leave_args(LBS_DEB_WEXT, "ret %d", err);
1063         return err;
1064 }
1065
1066
1067
1068
1069 /*********************************************************************/
1070 /*                                                                   */
1071 /*  Command execution                                                */
1072 /*                                                                   */
1073 /*********************************************************************/
1074
1075
1076 /**
1077  *  @brief This function handles the command response of scan
1078  *
1079  *  Called from handle_cmd_response() in cmdrespc.
1080  *
1081  *   The response buffer for the scan command has the following
1082  *      memory layout:
1083  *
1084  *     .-----------------------------------------------------------.
1085  *     |  header (4 * sizeof(u16)):  Standard command response hdr |
1086  *     .-----------------------------------------------------------.
1087  *     |  bufsize (u16) : sizeof the BSS Description data          |
1088  *     .-----------------------------------------------------------.
1089  *     |  NumOfSet (u8) : Number of BSS Descs returned             |
1090  *     .-----------------------------------------------------------.
1091  *     |  BSSDescription data (variable, size given in bufsize)    |
1092  *     .-----------------------------------------------------------.
1093  *     |  TLV data (variable, size calculated using header->size,  |
1094  *     |            bufsize and sizeof the fixed fields above)     |
1095  *     .-----------------------------------------------------------.
1096  *
1097  *  @param priv    A pointer to struct lbs_private structure
1098  *  @param resp    A pointer to cmd_ds_command
1099  *
1100  *  @return        0 or -1
1101  */
1102 static int lbs_ret_80211_scan(struct lbs_private *priv, unsigned long dummy,
1103                               struct cmd_header *resp)
1104 {
1105         struct cmd_ds_802_11_scan_rsp *scanresp = (void *)resp;
1106         struct bss_descriptor *iter_bss;
1107         struct bss_descriptor *safe;
1108         uint8_t *bssinfo;
1109         uint16_t scanrespsize;
1110         int bytesleft;
1111         int idx;
1112         int tlvbufsize;
1113         int ret;
1114
1115         lbs_deb_enter(LBS_DEB_SCAN);
1116
1117         /* Prune old entries from scan table */
1118         list_for_each_entry_safe (iter_bss, safe, &priv->network_list, list) {
1119                 unsigned long stale_time = iter_bss->last_scanned + DEFAULT_MAX_SCAN_AGE;
1120                 if (time_before(jiffies, stale_time))
1121                         continue;
1122                 list_move_tail (&iter_bss->list, &priv->network_free_list);
1123                 clear_bss_descriptor(iter_bss);
1124         }
1125
1126         if (scanresp->nr_sets > MAX_NETWORK_COUNT) {
1127                 lbs_deb_scan("SCAN_RESP: too many scan results (%d, max %d)\n",
1128                              scanresp->nr_sets, MAX_NETWORK_COUNT);
1129                 ret = -1;
1130                 goto done;
1131         }
1132
1133         bytesleft = le16_to_cpu(scanresp->bssdescriptsize);
1134         lbs_deb_scan("SCAN_RESP: bssdescriptsize %d\n", bytesleft);
1135
1136         scanrespsize = le16_to_cpu(resp->size);
1137         lbs_deb_scan("SCAN_RESP: scan results %d\n", scanresp->nr_sets);
1138
1139         bssinfo = scanresp->bssdesc_and_tlvbuffer;
1140
1141         /* The size of the TLV buffer is equal to the entire command response
1142          *   size (scanrespsize) minus the fixed fields (sizeof()'s), the
1143          *   BSS Descriptions (bssdescriptsize as bytesLef) and the command
1144          *   response header (S_DS_GEN)
1145          */
1146         tlvbufsize = scanrespsize - (bytesleft + sizeof(scanresp->bssdescriptsize)
1147                                      + sizeof(scanresp->nr_sets)
1148                                      + S_DS_GEN);
1149
1150         /*
1151          *  Process each scan response returned (scanresp->nr_sets). Save
1152          *    the information in the newbssentry and then insert into the
1153          *    driver scan table either as an update to an existing entry
1154          *    or as an addition at the end of the table
1155          */
1156         for (idx = 0; idx < scanresp->nr_sets && bytesleft; idx++) {
1157                 struct bss_descriptor new;
1158                 struct bss_descriptor *found = NULL;
1159                 struct bss_descriptor *oldest = NULL;
1160
1161                 /* Process the data fields and IEs returned for this BSS */
1162                 memset(&new, 0, sizeof (struct bss_descriptor));
1163                 if (lbs_process_bss(&new, &bssinfo, &bytesleft) != 0) {
1164                         /* error parsing the scan response, skipped */
1165                         lbs_deb_scan("SCAN_RESP: process_bss returned ERROR\n");
1166                         continue;
1167                 }
1168
1169                 /* Try to find this bss in the scan table */
1170                 list_for_each_entry (iter_bss, &priv->network_list, list) {
1171                         if (is_same_network(iter_bss, &new)) {
1172                                 found = iter_bss;
1173                                 break;
1174                         }
1175
1176                         if ((oldest == NULL) ||
1177                             (iter_bss->last_scanned < oldest->last_scanned))
1178                                 oldest = iter_bss;
1179                 }
1180
1181                 if (found) {
1182                         /* found, clear it */
1183                         clear_bss_descriptor(found);
1184                 } else if (!list_empty(&priv->network_free_list)) {
1185                         /* Pull one from the free list */
1186                         found = list_entry(priv->network_free_list.next,
1187                                            struct bss_descriptor, list);
1188                         list_move_tail(&found->list, &priv->network_list);
1189                 } else if (oldest) {
1190                         /* If there are no more slots, expire the oldest */
1191                         found = oldest;
1192                         clear_bss_descriptor(found);
1193                         list_move_tail(&found->list, &priv->network_list);
1194                 } else {
1195                         continue;
1196                 }
1197
1198                 lbs_deb_scan("SCAN_RESP: BSSID %pM\n", new.bssid);
1199
1200                 /* Copy the locally created newbssentry to the scan table */
1201                 memcpy(found, &new, offsetof(struct bss_descriptor, list));
1202         }
1203
1204         ret = 0;
1205
1206 done:
1207         lbs_deb_leave_args(LBS_DEB_SCAN, "ret %d", ret);
1208         return ret;
1209 }