libertas: slight cleanup of netif queue stop/wake
[safe/jmp/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/ctype.h>
8 #include <linux/if.h>
9 #include <linux/netdevice.h>
10 #include <linux/wireless.h>
11 #include <linux/etherdevice.h>
12
13 #include <net/ieee80211.h>
14 #include <net/iw_handler.h>
15
16 #include <asm/unaligned.h>
17
18 #include "host.h"
19 #include "decl.h"
20 #include "dev.h"
21 #include "scan.h"
22 #include "join.h"
23
24 //! Approximate amount of data needed to pass a scan result back to iwlist
25 #define MAX_SCAN_CELL_SIZE  (IW_EV_ADDR_LEN             \
26                              + IW_ESSID_MAX_SIZE        \
27                              + IW_EV_UINT_LEN           \
28                              + IW_EV_FREQ_LEN           \
29                              + IW_EV_QUAL_LEN           \
30                              + IW_ESSID_MAX_SIZE        \
31                              + IW_EV_PARAM_LEN          \
32                              + 40)      /* 40 for WPAIE */
33
34 //! Memory needed to store a max sized channel List TLV for a firmware scan
35 #define CHAN_TLV_MAX_SIZE  (sizeof(struct mrvlietypesheader)    \
36                             + (MRVDRV_MAX_CHANNELS_PER_SCAN     \
37                                * sizeof(struct chanscanparamset)))
38
39 //! Memory needed to store a max number/size SSID TLV for a firmware scan
40 #define SSID_TLV_MAX_SIZE  (1 * sizeof(struct mrvlietypes_ssidparamset))
41
42 //! Maximum memory needed for a lbs_scan_cmd_config with all TLVs at max
43 #define MAX_SCAN_CFG_ALLOC (sizeof(struct lbs_scan_cmd_config)  \
44                             + CHAN_TLV_MAX_SIZE                 \
45                             + SSID_TLV_MAX_SIZE)
46
47 //! The maximum number of channels the firmware can scan per command
48 #define MRVDRV_MAX_CHANNELS_PER_SCAN   14
49
50 /**
51  * @brief Number of channels to scan per firmware scan command issuance.
52  *
53  *  Number restricted to prevent hitting the limit on the amount of scan data
54  *  returned in a single firmware scan command.
55  */
56 #define MRVDRV_CHANNELS_PER_SCAN_CMD   4
57
58 //! Scan time specified in the channel TLV for each channel for passive scans
59 #define MRVDRV_PASSIVE_SCAN_CHAN_TIME  100
60
61 //! Scan time specified in the channel TLV for each channel for active scans
62 #define MRVDRV_ACTIVE_SCAN_CHAN_TIME   100
63
64 static const u8 zeromac[ETH_ALEN] = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
65 static const u8 bcastmac[ETH_ALEN] = { 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF };
66
67
68
69
70 /*********************************************************************/
71 /*                                                                   */
72 /*  Misc helper functions                                            */
73 /*                                                                   */
74 /*********************************************************************/
75
76 static inline void clear_bss_descriptor (struct bss_descriptor * bss)
77 {
78         /* Don't blow away ->list, just BSS data */
79         memset(bss, 0, offsetof(struct bss_descriptor, list));
80 }
81
82 /**
83  *  @brief Compare two SSIDs
84  *
85  *  @param ssid1    A pointer to ssid to compare
86  *  @param ssid2    A pointer to ssid to compare
87  *
88  *  @return         0: ssid is same, otherwise is different
89  */
90 int lbs_ssid_cmp(u8 *ssid1, u8 ssid1_len, u8 *ssid2, u8 ssid2_len)
91 {
92         if (ssid1_len != ssid2_len)
93                 return -1;
94
95         return memcmp(ssid1, ssid2, ssid1_len);
96 }
97
98 static inline int match_bss_no_security(struct lbs_802_11_security *secinfo,
99                         struct bss_descriptor * match_bss)
100 {
101         if (   !secinfo->wep_enabled
102             && !secinfo->WPAenabled
103             && !secinfo->WPA2enabled
104             && match_bss->wpa_ie[0] != MFIE_TYPE_GENERIC
105             && match_bss->rsn_ie[0] != MFIE_TYPE_RSN
106             && !(match_bss->capability & WLAN_CAPABILITY_PRIVACY)) {
107                 return 1;
108         }
109         return 0;
110 }
111
112 static inline int match_bss_static_wep(struct lbs_802_11_security *secinfo,
113                         struct bss_descriptor * match_bss)
114 {
115         if ( secinfo->wep_enabled
116            && !secinfo->WPAenabled
117            && !secinfo->WPA2enabled
118            && (match_bss->capability & WLAN_CAPABILITY_PRIVACY)) {
119                 return 1;
120         }
121         return 0;
122 }
123
124 static inline int match_bss_wpa(struct lbs_802_11_security *secinfo,
125                         struct bss_descriptor * match_bss)
126 {
127         if (  !secinfo->wep_enabled
128            && secinfo->WPAenabled
129            && (match_bss->wpa_ie[0] == MFIE_TYPE_GENERIC)
130            /* privacy bit may NOT be set in some APs like LinkSys WRT54G
131               && (match_bss->capability & WLAN_CAPABILITY_PRIVACY)) {
132             */
133            ) {
134                 return 1;
135         }
136         return 0;
137 }
138
139 static inline int match_bss_wpa2(struct lbs_802_11_security *secinfo,
140                         struct bss_descriptor * match_bss)
141 {
142         if (  !secinfo->wep_enabled
143            && secinfo->WPA2enabled
144            && (match_bss->rsn_ie[0] == MFIE_TYPE_RSN)
145            /* privacy bit may NOT be set in some APs like LinkSys WRT54G
146               && (match_bss->capability & WLAN_CAPABILITY_PRIVACY)) {
147             */
148            ) {
149                 return 1;
150         }
151         return 0;
152 }
153
154 static inline int match_bss_dynamic_wep(struct lbs_802_11_security *secinfo,
155                         struct bss_descriptor * match_bss)
156 {
157         if (  !secinfo->wep_enabled
158            && !secinfo->WPAenabled
159            && !secinfo->WPA2enabled
160            && (match_bss->wpa_ie[0] != MFIE_TYPE_GENERIC)
161            && (match_bss->rsn_ie[0] != MFIE_TYPE_RSN)
162            && (match_bss->capability & WLAN_CAPABILITY_PRIVACY)) {
163                 return 1;
164         }
165         return 0;
166 }
167
168 static inline int is_same_network(struct bss_descriptor *src,
169                                   struct bss_descriptor *dst)
170 {
171         /* A network is only a duplicate if the channel, BSSID, and ESSID
172          * all match.  We treat all <hidden> with the same BSSID and channel
173          * as one network */
174         return ((src->ssid_len == dst->ssid_len) &&
175                 (src->channel == dst->channel) &&
176                 !compare_ether_addr(src->bssid, dst->bssid) &&
177                 !memcmp(src->ssid, dst->ssid, src->ssid_len));
178 }
179
180 /**
181  *  @brief Check if a scanned network compatible with the driver settings
182  *
183  *   WEP     WPA     WPA2    ad-hoc  encrypt                      Network
184  * enabled enabled  enabled   AES     mode   privacy  WPA  WPA2  Compatible
185  *    0       0        0       0      NONE      0      0    0   yes No security
186  *    1       0        0       0      NONE      1      0    0   yes Static WEP
187  *    0       1        0       0       x        1x     1    x   yes WPA
188  *    0       0        1       0       x        1x     x    1   yes WPA2
189  *    0       0        0       1      NONE      1      0    0   yes Ad-hoc AES
190  *    0       0        0       0     !=NONE     1      0    0   yes Dynamic WEP
191  *
192  *
193  *  @param priv A pointer to struct lbs_private
194  *  @param index   Index in scantable to check against current driver settings
195  *  @param mode    Network mode: Infrastructure or IBSS
196  *
197  *  @return        Index in scantable, or error code if negative
198  */
199 static int is_network_compatible(struct lbs_private *priv,
200                 struct bss_descriptor * bss, u8 mode)
201 {
202         int matched = 0;
203
204         lbs_deb_enter(LBS_DEB_SCAN);
205
206         if (bss->mode != mode)
207                 goto done;
208
209         if ((matched = match_bss_no_security(&priv->secinfo, bss))) {
210                 goto done;
211         } else if ((matched = match_bss_static_wep(&priv->secinfo, bss))) {
212                 goto done;
213         } else if ((matched = match_bss_wpa(&priv->secinfo, bss))) {
214                 lbs_deb_scan(
215                        "is_network_compatible() WPA: wpa_ie 0x%x "
216                        "wpa2_ie 0x%x WEP %s WPA %s WPA2 %s "
217                        "privacy 0x%x\n", bss->wpa_ie[0], bss->rsn_ie[0],
218                        priv->secinfo.wep_enabled ? "e" : "d",
219                        priv->secinfo.WPAenabled ? "e" : "d",
220                        priv->secinfo.WPA2enabled ? "e" : "d",
221                        (bss->capability & WLAN_CAPABILITY_PRIVACY));
222                 goto done;
223         } else if ((matched = match_bss_wpa2(&priv->secinfo, bss))) {
224                 lbs_deb_scan(
225                        "is_network_compatible() WPA2: wpa_ie 0x%x "
226                        "wpa2_ie 0x%x WEP %s WPA %s WPA2 %s "
227                        "privacy 0x%x\n", bss->wpa_ie[0], bss->rsn_ie[0],
228                        priv->secinfo.wep_enabled ? "e" : "d",
229                        priv->secinfo.WPAenabled ? "e" : "d",
230                        priv->secinfo.WPA2enabled ? "e" : "d",
231                        (bss->capability & WLAN_CAPABILITY_PRIVACY));
232                 goto done;
233         } else if ((matched = match_bss_dynamic_wep(&priv->secinfo, bss))) {
234                 lbs_deb_scan(
235                        "is_network_compatible() dynamic WEP: "
236                        "wpa_ie 0x%x wpa2_ie 0x%x privacy 0x%x\n",
237                        bss->wpa_ie[0], bss->rsn_ie[0],
238                        (bss->capability & WLAN_CAPABILITY_PRIVACY));
239                 goto done;
240         }
241
242         /* bss security settings don't match those configured on card */
243         lbs_deb_scan(
244                "is_network_compatible() FAILED: wpa_ie 0x%x "
245                "wpa2_ie 0x%x WEP %s WPA %s WPA2 %s privacy 0x%x\n",
246                bss->wpa_ie[0], bss->rsn_ie[0],
247                priv->secinfo.wep_enabled ? "e" : "d",
248                priv->secinfo.WPAenabled ? "e" : "d",
249                priv->secinfo.WPA2enabled ? "e" : "d",
250                (bss->capability & WLAN_CAPABILITY_PRIVACY));
251
252 done:
253         lbs_deb_leave_args(LBS_DEB_SCAN, "matched: %d", matched);
254         return matched;
255 }
256
257
258
259
260 /*********************************************************************/
261 /*                                                                   */
262 /*  Main scanning support                                            */
263 /*                                                                   */
264 /*********************************************************************/
265
266 void lbs_scan_worker(struct work_struct *work)
267 {
268         struct lbs_private *priv =
269                 container_of(work, struct lbs_private, scan_work.work);
270
271         lbs_deb_enter(LBS_DEB_SCAN);
272         lbs_scan_networks(priv, NULL, 0);
273         lbs_deb_leave(LBS_DEB_SCAN);
274 }
275
276
277 /**
278  *  @brief Create a channel list for the driver to scan based on region info
279  *
280  *  Only used from lbs_scan_setup_scan_config()
281  *
282  *  Use the driver region/band information to construct a comprehensive list
283  *    of channels to scan.  This routine is used for any scan that is not
284  *    provided a specific channel list to scan.
285  *
286  *  @param priv          A pointer to struct lbs_private structure
287  *  @param scanchanlist  Output parameter: resulting channel list to scan
288  *  @param filteredscan  Flag indicating whether or not a BSSID or SSID filter
289  *                       is being sent in the command to firmware.  Used to
290  *                       increase the number of channels sent in a scan
291  *                       command and to disable the firmware channel scan
292  *                       filter.
293  *
294  *  @return              void
295  */
296 static int lbs_scan_create_channel_list(struct lbs_private *priv,
297                                           struct chanscanparamset * scanchanlist,
298                                           u8 filteredscan)
299 {
300
301         struct region_channel *scanregion;
302         struct chan_freq_power *cfp;
303         int rgnidx;
304         int chanidx;
305         int nextchan;
306         u8 scantype;
307
308         chanidx = 0;
309
310         /* Set the default scan type to the user specified type, will later
311          *   be changed to passive on a per channel basis if restricted by
312          *   regulatory requirements (11d or 11h)
313          */
314         scantype = CMD_SCAN_TYPE_ACTIVE;
315
316         for (rgnidx = 0; rgnidx < ARRAY_SIZE(priv->region_channel); rgnidx++) {
317                 if (priv->enable11d &&
318                     (priv->connect_status != LBS_CONNECTED) &&
319                     (priv->mesh_connect_status != LBS_CONNECTED)) {
320                         /* Scan all the supported chan for the first scan */
321                         if (!priv->universal_channel[rgnidx].valid)
322                                 continue;
323                         scanregion = &priv->universal_channel[rgnidx];
324
325                         /* clear the parsed_region_chan for the first scan */
326                         memset(&priv->parsed_region_chan, 0x00,
327                                sizeof(priv->parsed_region_chan));
328                 } else {
329                         if (!priv->region_channel[rgnidx].valid)
330                                 continue;
331                         scanregion = &priv->region_channel[rgnidx];
332                 }
333
334                 for (nextchan = 0;
335                      nextchan < scanregion->nrcfp; nextchan++, chanidx++) {
336
337                         cfp = scanregion->CFP + nextchan;
338
339                         if (priv->enable11d) {
340                                 scantype =
341                                     lbs_get_scan_type_11d(cfp->channel,
342                                                            &priv->
343                                                            parsed_region_chan);
344                         }
345
346                         switch (scanregion->band) {
347                         case BAND_B:
348                         case BAND_G:
349                         default:
350                                 scanchanlist[chanidx].radiotype =
351                                     CMD_SCAN_RADIO_TYPE_BG;
352                                 break;
353                         }
354
355                         if (scantype == CMD_SCAN_TYPE_PASSIVE) {
356                                 scanchanlist[chanidx].maxscantime =
357                                     cpu_to_le16(MRVDRV_PASSIVE_SCAN_CHAN_TIME);
358                                 scanchanlist[chanidx].chanscanmode.passivescan =
359                                     1;
360                         } else {
361                                 scanchanlist[chanidx].maxscantime =
362                                     cpu_to_le16(MRVDRV_ACTIVE_SCAN_CHAN_TIME);
363                                 scanchanlist[chanidx].chanscanmode.passivescan =
364                                     0;
365                         }
366
367                         scanchanlist[chanidx].channumber = cfp->channel;
368
369                         if (filteredscan) {
370                                 scanchanlist[chanidx].chanscanmode.
371                                     disablechanfilt = 1;
372                         }
373                 }
374         }
375         return chanidx;
376 }
377
378
379 /*
380  * Add SSID TLV of the form:
381  *
382  * TLV-ID SSID     00 00
383  * length          06 00
384  * ssid            4d 4e 54 45 53 54
385  */
386 static int lbs_scan_add_ssid_tlv(u8 *tlv,
387         const struct lbs_ioctl_user_scan_cfg *user_cfg)
388 {
389         struct mrvlietypes_ssidparamset *ssid_tlv =
390                 (struct mrvlietypes_ssidparamset *)tlv;
391         ssid_tlv->header.type = cpu_to_le16(TLV_TYPE_SSID);
392         ssid_tlv->header.len = cpu_to_le16(user_cfg->ssid_len);
393         memcpy(ssid_tlv->ssid, user_cfg->ssid, user_cfg->ssid_len);
394         return sizeof(ssid_tlv->header) + user_cfg->ssid_len;
395 }
396
397
398 /*
399  * Add CHANLIST TLV of the form
400  *
401  * TLV-ID CHANLIST 01 01
402  * length          5b 00
403  * channel 1       00 01 00 00 00 64 00
404  *   radio type    00
405  *   channel          01
406  *   scan type           00
407  *   min scan time          00 00
408  *   max scan time                64 00
409  * channel 2       00 02 00 00 00 64 00
410  * channel 3       00 03 00 00 00 64 00
411  * channel 4       00 04 00 00 00 64 00
412  * channel 5       00 05 00 00 00 64 00
413  * channel 6       00 06 00 00 00 64 00
414  * channel 7       00 07 00 00 00 64 00
415  * channel 8       00 08 00 00 00 64 00
416  * channel 9       00 09 00 00 00 64 00
417  * channel 10      00 0a 00 00 00 64 00
418  * channel 11      00 0b 00 00 00 64 00
419  * channel 12      00 0c 00 00 00 64 00
420  * channel 13      00 0d 00 00 00 64 00
421  *
422  */
423 static int lbs_scan_add_chanlist_tlv(u8 *tlv,
424         struct chanscanparamset *chan_list,
425         int chan_count)
426 {
427         size_t size = sizeof(struct chanscanparamset) * chan_count;
428         struct mrvlietypes_chanlistparamset *chan_tlv =
429                 (struct mrvlietypes_chanlistparamset *) tlv;
430
431         chan_tlv->header.type = cpu_to_le16(TLV_TYPE_CHANLIST);
432         memcpy(chan_tlv->chanscanparam, chan_list, size);
433         chan_tlv->header.len = cpu_to_le16(size);
434         return sizeof(chan_tlv->header) + size;
435 }
436
437
438 /*
439  * Add RATES TLV of the form
440  *
441  * TLV-ID RATES    01 00
442  * length          0e 00
443  * rates           82 84 8b 96 0c 12 18 24 30 48 60 6c
444  *
445  * The rates are in lbs_bg_rates[], but for the 802.11b
446  * rates the high bit isn't set.
447  */
448 static int lbs_scan_add_rates_tlv(u8 *tlv)
449 {
450         int i;
451         struct mrvlietypes_ratesparamset *rate_tlv =
452                 (struct mrvlietypes_ratesparamset *) tlv;
453
454         rate_tlv->header.type = cpu_to_le16(TLV_TYPE_RATES);
455         tlv += sizeof(rate_tlv->header);
456         for (i = 0; i < MAX_RATES; i++) {
457                 *tlv = lbs_bg_rates[i];
458                 if (*tlv == 0)
459                         break;
460                 /* This code makes sure that the 802.11b rates (1 MBit/s, 2
461                    MBit/s, 5.5 MBit/s and 11 MBit/s get's the high bit set.
462                    Note that the values are MBit/s * 2, to mark them as
463                    basic rates so that the firmware likes it better */
464                 if (*tlv == 0x02 || *tlv == 0x04 ||
465                     *tlv == 0x0b || *tlv == 0x16)
466                         *tlv |= 0x80;
467                 tlv++;
468         }
469         rate_tlv->header.len = cpu_to_le16(i);
470         return sizeof(rate_tlv->header) + i;
471 }
472
473
474 /*
475  * Generate the CMD_802_11_SCAN command with the proper tlv
476  * for a bunch of channels.
477  */
478 static int lbs_do_scan(struct lbs_private *priv,
479         u8 bsstype,
480         struct chanscanparamset *chan_list,
481         int chan_count,
482         const struct lbs_ioctl_user_scan_cfg *user_cfg)
483 {
484         int ret = -ENOMEM;
485         struct lbs_scan_cmd_config *scan_cmd;
486         u8 *tlv;    /* pointer into our current, growing TLV storage area */
487
488         lbs_deb_enter_args(LBS_DEB_SCAN, "bsstype %d, chanlist[].chan %d, "
489                 "chan_count %d",
490                 bsstype, chan_list[0].channumber, chan_count);
491
492         /* create the fixed part for scan command */
493         scan_cmd = kzalloc(MAX_SCAN_CFG_ALLOC, GFP_KERNEL);
494         if (scan_cmd == NULL)
495                 goto out;
496         tlv = scan_cmd->tlvbuffer;
497         if (user_cfg)
498                 memcpy(scan_cmd->bssid, user_cfg->bssid, ETH_ALEN);
499         scan_cmd->bsstype = bsstype;
500
501         /* add TLVs */
502         if (user_cfg && user_cfg->ssid_len)
503                 tlv += lbs_scan_add_ssid_tlv(tlv, user_cfg);
504         if (chan_list && chan_count)
505                 tlv += lbs_scan_add_chanlist_tlv(tlv, chan_list, chan_count);
506         tlv += lbs_scan_add_rates_tlv(tlv);
507
508         /* This is the final data we are about to send */
509         scan_cmd->tlvbufferlen = tlv - scan_cmd->tlvbuffer;
510         lbs_deb_hex(LBS_DEB_SCAN, "SCAN_CMD", (void *)scan_cmd, 1+6);
511         lbs_deb_hex(LBS_DEB_SCAN, "SCAN_TLV", scan_cmd->tlvbuffer,
512                 scan_cmd->tlvbufferlen);
513
514         ret = lbs_prepare_and_send_command(priv, CMD_802_11_SCAN, 0,
515                 CMD_OPTION_WAITFORRSP, 0, scan_cmd);
516 out:
517         kfree(scan_cmd);
518         lbs_deb_leave_args(LBS_DEB_SCAN, "ret %d", ret);
519         return ret;
520 }
521
522
523 /**
524  *  @brief Internal function used to start a scan based on an input config
525  *
526  *  Also used from debugfs
527  *
528  *  Use the input user scan configuration information when provided in
529  *    order to send the appropriate scan commands to firmware to populate or
530  *    update the internal driver scan table
531  *
532  *  @param priv          A pointer to struct lbs_private structure
533  *  @param puserscanin   Pointer to the input configuration for the requested
534  *                       scan.
535  *
536  *  @return              0 or < 0 if error
537  */
538 int lbs_scan_networks(struct lbs_private *priv,
539         const struct lbs_ioctl_user_scan_cfg *user_cfg,
540                        int full_scan)
541 {
542         int ret = -ENOMEM;
543         struct chanscanparamset *chan_list;
544         struct chanscanparamset *curr_chans;
545         int chan_count;
546         u8 bsstype = CMD_BSS_TYPE_ANY;
547         int numchannels = MRVDRV_CHANNELS_PER_SCAN_CMD;
548         int filteredscan = 0;
549         union iwreq_data wrqu;
550 #ifdef CONFIG_LIBERTAS_DEBUG
551         struct bss_descriptor *iter;
552         int i = 0;
553         DECLARE_MAC_BUF(mac);
554 #endif
555
556         lbs_deb_enter_args(LBS_DEB_SCAN, "full_scan %d",
557                 full_scan);
558
559         /* Cancel any partial outstanding partial scans if this scan
560          * is a full scan.
561          */
562         if (full_scan && delayed_work_pending(&priv->scan_work))
563                 cancel_delayed_work(&priv->scan_work);
564
565         /* Determine same scan parameters */
566         if (user_cfg) {
567                 if (user_cfg->bsstype)
568                         bsstype = user_cfg->bsstype;
569                 if (compare_ether_addr(user_cfg->bssid, &zeromac[0]) != 0) {
570                         numchannels = MRVDRV_MAX_CHANNELS_PER_SCAN;
571                         filteredscan = 1;
572                 }
573         }
574         lbs_deb_scan("numchannels %d, bsstype %d, "
575                 "filteredscan %d\n",
576                 numchannels, bsstype, filteredscan);
577
578         /* Create list of channels to scan */
579         chan_list = kzalloc(sizeof(struct chanscanparamset) *
580                                 LBS_IOCTL_USER_SCAN_CHAN_MAX, GFP_KERNEL);
581         if (!chan_list) {
582                 lbs_pr_alert("SCAN: chan_list empty\n");
583                 goto out;
584         }
585
586         /* We want to scan all channels */
587         chan_count = lbs_scan_create_channel_list(priv, chan_list,
588                 filteredscan);
589
590         netif_stop_queue(priv->dev);
591         netif_carrier_off(priv->dev);
592         if (priv->mesh_dev) {
593                 netif_stop_queue(priv->mesh_dev);
594                 netif_carrier_off(priv->mesh_dev);
595         }
596
597         /* Prepare to continue an interrupted scan */
598         lbs_deb_scan("chan_count %d, last_scanned_channel %d\n",
599                      chan_count, priv->last_scanned_channel);
600         curr_chans = chan_list;
601         /* advance channel list by already-scanned-channels */
602         if (priv->last_scanned_channel > 0) {
603                 curr_chans += priv->last_scanned_channel;
604                 chan_count -= priv->last_scanned_channel;
605         }
606
607         /* Send scan command(s)
608          * numchannels contains the number of channels we should maximally scan
609          * chan_count is the total number of channels to scan
610          */
611
612         while (chan_count) {
613                 int to_scan = min(numchannels, chan_count);
614                 lbs_deb_scan("scanning %d of %d channels\n",
615                         to_scan, chan_count);
616                 ret = lbs_do_scan(priv, bsstype, curr_chans,
617                         to_scan, user_cfg);
618                 if (ret) {
619                         lbs_pr_err("SCAN_CMD failed\n");
620                         goto out2;
621                 }
622                 curr_chans += to_scan;
623                 chan_count -= to_scan;
624
625                 /* somehow schedule the next part of the scan */
626                 if (chan_count &&
627                     !full_scan &&
628                     !priv->surpriseremoved) {
629                         /* -1 marks just that we're currently scanning */
630                         if (priv->last_scanned_channel < 0)
631                                 priv->last_scanned_channel = to_scan;
632                         else
633                                 priv->last_scanned_channel += to_scan;
634                         cancel_delayed_work(&priv->scan_work);
635                         queue_delayed_work(priv->work_thread, &priv->scan_work,
636                                 msecs_to_jiffies(300));
637                         /* skip over GIWSCAN event */
638                         goto out;
639                 }
640
641         }
642         memset(&wrqu, 0, sizeof(union iwreq_data));
643         wireless_send_event(priv->dev, SIOCGIWSCAN, &wrqu, NULL);
644
645 #ifdef CONFIG_LIBERTAS_DEBUG
646         /* Dump the scan table */
647         mutex_lock(&priv->lock);
648         lbs_deb_scan("scan table:\n");
649         list_for_each_entry(iter, &priv->network_list, list)
650                 lbs_deb_scan("%02d: BSSID %s, RSSI %d, SSID '%s'\n",
651                        i++, print_mac(mac, iter->bssid), (s32) iter->rssi,
652                        escape_essid(iter->ssid, iter->ssid_len));
653         mutex_unlock(&priv->lock);
654 #endif
655
656 out2:
657         priv->last_scanned_channel = 0;
658
659 out:
660         if (priv->connect_status == LBS_CONNECTED) {
661                 netif_carrier_on(priv->dev);
662                 if (!priv->tx_pending_len)
663                         netif_wake_queue(priv->dev);
664         }
665         if (priv->mesh_dev && (priv->mesh_connect_status == LBS_CONNECTED)) {
666                 netif_carrier_on(priv->mesh_dev);
667                 if (!priv->tx_pending_len)
668                         netif_wake_queue(priv->mesh_dev);
669         }
670         kfree(chan_list);
671
672         lbs_deb_leave_args(LBS_DEB_SCAN, "ret %d", ret);
673         return ret;
674 }
675
676
677
678
679 /*********************************************************************/
680 /*                                                                   */
681 /*  Result interpretation                                            */
682 /*                                                                   */
683 /*********************************************************************/
684
685 /**
686  *  @brief Interpret a BSS scan response returned from the firmware
687  *
688  *  Parse the various fixed fields and IEs passed back for a a BSS probe
689  *  response or beacon from the scan command.  Record information as needed
690  *  in the scan table struct bss_descriptor for that entry.
691  *
692  *  @param bss  Output parameter: Pointer to the BSS Entry
693  *
694  *  @return             0 or -1
695  */
696 static int lbs_process_bss(struct bss_descriptor *bss,
697                                 u8 ** pbeaconinfo, int *bytesleft)
698 {
699         struct ieeetypes_fhparamset *pFH;
700         struct ieeetypes_dsparamset *pDS;
701         struct ieeetypes_cfparamset *pCF;
702         struct ieeetypes_ibssparamset *pibss;
703         DECLARE_MAC_BUF(mac);
704         struct ieeetypes_countryinfoset *pcountryinfo;
705         u8 *pos, *end, *p;
706         u8 n_ex_rates = 0, got_basic_rates = 0, n_basic_rates = 0;
707         u16 beaconsize = 0;
708         int ret;
709
710         lbs_deb_enter(LBS_DEB_SCAN);
711
712         if (*bytesleft >= sizeof(beaconsize)) {
713                 /* Extract & convert beacon size from the command buffer */
714                 beaconsize = le16_to_cpu(get_unaligned((__le16 *)*pbeaconinfo));
715                 *bytesleft -= sizeof(beaconsize);
716                 *pbeaconinfo += sizeof(beaconsize);
717         }
718
719         if (beaconsize == 0 || beaconsize > *bytesleft) {
720                 *pbeaconinfo += *bytesleft;
721                 *bytesleft = 0;
722                 ret = -1;
723                 goto done;
724         }
725
726         /* Initialize the current working beacon pointer for this BSS iteration */
727         pos = *pbeaconinfo;
728         end = pos + beaconsize;
729
730         /* Advance the return beacon pointer past the current beacon */
731         *pbeaconinfo += beaconsize;
732         *bytesleft -= beaconsize;
733
734         memcpy(bss->bssid, pos, ETH_ALEN);
735         lbs_deb_scan("process_bss: BSSID %s\n", print_mac(mac, bss->bssid));
736         pos += ETH_ALEN;
737
738         if ((end - pos) < 12) {
739                 lbs_deb_scan("process_bss: Not enough bytes left\n");
740                 ret = -1;
741                 goto done;
742         }
743
744         /*
745          * next 4 fields are RSSI, time stamp, beacon interval,
746          *   and capability information
747          */
748
749         /* RSSI is 1 byte long */
750         bss->rssi = *pos;
751         lbs_deb_scan("process_bss: RSSI %d\n", *pos);
752         pos++;
753
754         /* time stamp is 8 bytes long */
755         pos += 8;
756
757         /* beacon interval is 2 bytes long */
758         bss->beaconperiod = le16_to_cpup((void *) pos);
759         pos += 2;
760
761         /* capability information is 2 bytes long */
762         bss->capability = le16_to_cpup((void *) pos);
763         lbs_deb_scan("process_bss: capabilities 0x%04x\n", bss->capability);
764         pos += 2;
765
766         if (bss->capability & WLAN_CAPABILITY_PRIVACY)
767                 lbs_deb_scan("process_bss: WEP enabled\n");
768         if (bss->capability & WLAN_CAPABILITY_IBSS)
769                 bss->mode = IW_MODE_ADHOC;
770         else
771                 bss->mode = IW_MODE_INFRA;
772
773         /* rest of the current buffer are IE's */
774         lbs_deb_scan("process_bss: IE len %zd\n", end - pos);
775         lbs_deb_hex(LBS_DEB_SCAN, "process_bss: IE info", pos, end - pos);
776
777         /* process variable IE */
778         while (pos <= end - 2) {
779                 struct ieee80211_info_element * elem =
780                         (struct ieee80211_info_element *) pos;
781
782                 if (pos + elem->len > end) {
783                         lbs_deb_scan("process_bss: error in processing IE, "
784                                "bytes left < IE length\n");
785                         break;
786                 }
787
788                 switch (elem->id) {
789                 case MFIE_TYPE_SSID:
790                         bss->ssid_len = elem->len;
791                         memcpy(bss->ssid, elem->data, elem->len);
792                         lbs_deb_scan("got SSID IE: '%s', len %u\n",
793                                      escape_essid(bss->ssid, bss->ssid_len),
794                                      bss->ssid_len);
795                         break;
796
797                 case MFIE_TYPE_RATES:
798                         n_basic_rates = min_t(u8, MAX_RATES, elem->len);
799                         memcpy(bss->rates, elem->data, n_basic_rates);
800                         got_basic_rates = 1;
801                         lbs_deb_scan("got RATES IE\n");
802                         break;
803
804                 case MFIE_TYPE_FH_SET:
805                         pFH = (struct ieeetypes_fhparamset *) pos;
806                         memmove(&bss->phyparamset.fhparamset, pFH,
807                                 sizeof(struct ieeetypes_fhparamset));
808                         lbs_deb_scan("got FH IE\n");
809                         break;
810
811                 case MFIE_TYPE_DS_SET:
812                         pDS = (struct ieeetypes_dsparamset *) pos;
813                         bss->channel = pDS->currentchan;
814                         memcpy(&bss->phyparamset.dsparamset, pDS,
815                                sizeof(struct ieeetypes_dsparamset));
816                         lbs_deb_scan("got DS IE, channel %d\n", bss->channel);
817                         break;
818
819                 case MFIE_TYPE_CF_SET:
820                         pCF = (struct ieeetypes_cfparamset *) pos;
821                         memcpy(&bss->ssparamset.cfparamset, pCF,
822                                sizeof(struct ieeetypes_cfparamset));
823                         lbs_deb_scan("got CF IE\n");
824                         break;
825
826                 case MFIE_TYPE_IBSS_SET:
827                         pibss = (struct ieeetypes_ibssparamset *) pos;
828                         bss->atimwindow = le16_to_cpu(pibss->atimwindow);
829                         memmove(&bss->ssparamset.ibssparamset, pibss,
830                                 sizeof(struct ieeetypes_ibssparamset));
831                         lbs_deb_scan("got IBSS IE\n");
832                         break;
833
834                 case MFIE_TYPE_COUNTRY:
835                         pcountryinfo = (struct ieeetypes_countryinfoset *) pos;
836                         lbs_deb_scan("got COUNTRY IE\n");
837                         if (pcountryinfo->len < sizeof(pcountryinfo->countrycode)
838                             || pcountryinfo->len > 254) {
839                                 lbs_deb_scan("process_bss: 11D- Err "
840                                        "CountryInfo len %d, min %zd, max 254\n",
841                                        pcountryinfo->len,
842                                        sizeof(pcountryinfo->countrycode));
843                                 ret = -1;
844                                 goto done;
845                         }
846
847                         memcpy(&bss->countryinfo,
848                                pcountryinfo, pcountryinfo->len + 2);
849                         lbs_deb_hex(LBS_DEB_SCAN, "process_bss: 11d countryinfo",
850                                 (u8 *) pcountryinfo,
851                                 (u32) (pcountryinfo->len + 2));
852                         break;
853
854                 case MFIE_TYPE_RATES_EX:
855                         /* only process extended supported rate if data rate is
856                          * already found. Data rate IE should come before
857                          * extended supported rate IE
858                          */
859                         lbs_deb_scan("got RATESEX IE\n");
860                         if (!got_basic_rates) {
861                                 lbs_deb_scan("... but ignoring it\n");
862                                 break;
863                         }
864
865                         n_ex_rates = elem->len;
866                         if (n_basic_rates + n_ex_rates > MAX_RATES)
867                                 n_ex_rates = MAX_RATES - n_basic_rates;
868
869                         p = bss->rates + n_basic_rates;
870                         memcpy(p, elem->data, n_ex_rates);
871                         break;
872
873                 case MFIE_TYPE_GENERIC:
874                         if (elem->len >= 4 &&
875                             elem->data[0] == 0x00 &&
876                             elem->data[1] == 0x50 &&
877                             elem->data[2] == 0xf2 &&
878                             elem->data[3] == 0x01) {
879                                 bss->wpa_ie_len = min(elem->len + 2,
880                                                       MAX_WPA_IE_LEN);
881                                 memcpy(bss->wpa_ie, elem, bss->wpa_ie_len);
882                                 lbs_deb_scan("got WPA IE\n");
883                                 lbs_deb_hex(LBS_DEB_SCAN, "WPA IE", bss->wpa_ie,
884                                             elem->len);
885                         } else if (elem->len >= MARVELL_MESH_IE_LENGTH &&
886                             elem->data[0] == 0x00 &&
887                             elem->data[1] == 0x50 &&
888                             elem->data[2] == 0x43 &&
889                             elem->data[3] == 0x04) {
890                                 lbs_deb_scan("got mesh IE\n");
891                                 bss->mesh = 1;
892                         } else {
893                                 lbs_deb_scan("got generiec IE: "
894                                         "%02x:%02x:%02x:%02x, len %d\n",
895                                         elem->data[0], elem->data[1],
896                                         elem->data[2], elem->data[3],
897                                         elem->len);
898                         }
899                         break;
900
901                 case MFIE_TYPE_RSN:
902                         lbs_deb_scan("got RSN IE\n");
903                         bss->rsn_ie_len = min(elem->len + 2, MAX_WPA_IE_LEN);
904                         memcpy(bss->rsn_ie, elem, bss->rsn_ie_len);
905                         lbs_deb_hex(LBS_DEB_SCAN, "process_bss: RSN_IE",
906                                 bss->rsn_ie, elem->len);
907                         break;
908
909                 default:
910                         lbs_deb_scan("got IE 0x%04x, len %d\n",
911                                 elem->id, elem->len);
912                         break;
913                 }
914
915                 pos += elem->len + 2;
916         }
917
918         /* Timestamp */
919         bss->last_scanned = jiffies;
920         lbs_unset_basic_rate_flags(bss->rates, sizeof(bss->rates));
921
922         ret = 0;
923
924 done:
925         lbs_deb_leave_args(LBS_DEB_SCAN, "ret %d", ret);
926         return ret;
927 }
928
929 /**
930  *  @brief This function finds a specific compatible BSSID in the scan list
931  *
932  *  Used in association code
933  *
934  *  @param priv  A pointer to struct lbs_private
935  *  @param bssid    BSSID to find in the scan list
936  *  @param mode     Network mode: Infrastructure or IBSS
937  *
938  *  @return         index in BSSID list, or error return code (< 0)
939  */
940 struct bss_descriptor *lbs_find_bssid_in_list(struct lbs_private *priv,
941                 u8 * bssid, u8 mode)
942 {
943         struct bss_descriptor * iter_bss;
944         struct bss_descriptor * found_bss = NULL;
945
946         lbs_deb_enter(LBS_DEB_SCAN);
947
948         if (!bssid)
949                 goto out;
950
951         lbs_deb_hex(LBS_DEB_SCAN, "looking for",
952                 bssid, ETH_ALEN);
953
954         /* Look through the scan table for a compatible match.  The loop will
955          *   continue past a matched bssid that is not compatible in case there
956          *   is an AP with multiple SSIDs assigned to the same BSSID
957          */
958         mutex_lock(&priv->lock);
959         list_for_each_entry (iter_bss, &priv->network_list, list) {
960                 if (compare_ether_addr(iter_bss->bssid, bssid))
961                         continue; /* bssid doesn't match */
962                 switch (mode) {
963                 case IW_MODE_INFRA:
964                 case IW_MODE_ADHOC:
965                         if (!is_network_compatible(priv, iter_bss, mode))
966                                 break;
967                         found_bss = iter_bss;
968                         break;
969                 default:
970                         found_bss = iter_bss;
971                         break;
972                 }
973         }
974         mutex_unlock(&priv->lock);
975
976 out:
977         lbs_deb_leave_args(LBS_DEB_SCAN, "found_bss %p", found_bss);
978         return found_bss;
979 }
980
981 /**
982  *  @brief This function finds ssid in ssid list.
983  *
984  *  Used in association code
985  *
986  *  @param priv  A pointer to struct lbs_private
987  *  @param ssid     SSID to find in the list
988  *  @param bssid    BSSID to qualify the SSID selection (if provided)
989  *  @param mode     Network mode: Infrastructure or IBSS
990  *
991  *  @return         index in BSSID list
992  */
993 struct bss_descriptor *lbs_find_ssid_in_list(struct lbs_private *priv,
994                    u8 *ssid, u8 ssid_len, u8 * bssid, u8 mode,
995                    int channel)
996 {
997         u8 bestrssi = 0;
998         struct bss_descriptor * iter_bss = NULL;
999         struct bss_descriptor * found_bss = NULL;
1000         struct bss_descriptor * tmp_oldest = NULL;
1001
1002         lbs_deb_enter(LBS_DEB_SCAN);
1003
1004         mutex_lock(&priv->lock);
1005
1006         list_for_each_entry (iter_bss, &priv->network_list, list) {
1007                 if (   !tmp_oldest
1008                     || (iter_bss->last_scanned < tmp_oldest->last_scanned))
1009                         tmp_oldest = iter_bss;
1010
1011                 if (lbs_ssid_cmp(iter_bss->ssid, iter_bss->ssid_len,
1012                                       ssid, ssid_len) != 0)
1013                         continue; /* ssid doesn't match */
1014                 if (bssid && compare_ether_addr(iter_bss->bssid, bssid) != 0)
1015                         continue; /* bssid doesn't match */
1016                 if ((channel > 0) && (iter_bss->channel != channel))
1017                         continue; /* channel doesn't match */
1018
1019                 switch (mode) {
1020                 case IW_MODE_INFRA:
1021                 case IW_MODE_ADHOC:
1022                         if (!is_network_compatible(priv, iter_bss, mode))
1023                                 break;
1024
1025                         if (bssid) {
1026                                 /* Found requested BSSID */
1027                                 found_bss = iter_bss;
1028                                 goto out;
1029                         }
1030
1031                         if (SCAN_RSSI(iter_bss->rssi) > bestrssi) {
1032                                 bestrssi = SCAN_RSSI(iter_bss->rssi);
1033                                 found_bss = iter_bss;
1034                         }
1035                         break;
1036                 case IW_MODE_AUTO:
1037                 default:
1038                         if (SCAN_RSSI(iter_bss->rssi) > bestrssi) {
1039                                 bestrssi = SCAN_RSSI(iter_bss->rssi);
1040                                 found_bss = iter_bss;
1041                         }
1042                         break;
1043                 }
1044         }
1045
1046 out:
1047         mutex_unlock(&priv->lock);
1048         lbs_deb_leave_args(LBS_DEB_SCAN, "found_bss %p", found_bss);
1049         return found_bss;
1050 }
1051
1052 /**
1053  *  @brief This function finds the best SSID in the Scan List
1054  *
1055  *  Search the scan table for the best SSID that also matches the current
1056  *   adapter network preference (infrastructure or adhoc)
1057  *
1058  *  @param priv  A pointer to struct lbs_private
1059  *
1060  *  @return         index in BSSID list
1061  */
1062 static struct bss_descriptor *lbs_find_best_ssid_in_list(
1063         struct lbs_private *priv,
1064         u8 mode)
1065 {
1066         u8 bestrssi = 0;
1067         struct bss_descriptor * iter_bss;
1068         struct bss_descriptor * best_bss = NULL;
1069
1070         lbs_deb_enter(LBS_DEB_SCAN);
1071
1072         mutex_lock(&priv->lock);
1073
1074         list_for_each_entry (iter_bss, &priv->network_list, list) {
1075                 switch (mode) {
1076                 case IW_MODE_INFRA:
1077                 case IW_MODE_ADHOC:
1078                         if (!is_network_compatible(priv, iter_bss, mode))
1079                                 break;
1080                         if (SCAN_RSSI(iter_bss->rssi) <= bestrssi)
1081                                 break;
1082                         bestrssi = SCAN_RSSI(iter_bss->rssi);
1083                         best_bss = iter_bss;
1084                         break;
1085                 case IW_MODE_AUTO:
1086                 default:
1087                         if (SCAN_RSSI(iter_bss->rssi) <= bestrssi)
1088                                 break;
1089                         bestrssi = SCAN_RSSI(iter_bss->rssi);
1090                         best_bss = iter_bss;
1091                         break;
1092                 }
1093         }
1094
1095         mutex_unlock(&priv->lock);
1096         lbs_deb_leave_args(LBS_DEB_SCAN, "best_bss %p", best_bss);
1097         return best_bss;
1098 }
1099
1100 /**
1101  *  @brief Find the AP with specific ssid in the scan list
1102  *
1103  *  Used from association worker.
1104  *
1105  *  @param priv         A pointer to struct lbs_private structure
1106  *  @param pSSID        A pointer to AP's ssid
1107  *
1108  *  @return             0--success, otherwise--fail
1109  */
1110 int lbs_find_best_network_ssid(struct lbs_private *priv,
1111                 u8 *out_ssid, u8 *out_ssid_len, u8 preferred_mode, u8 *out_mode)
1112 {
1113         int ret = -1;
1114         struct bss_descriptor * found;
1115
1116         lbs_deb_enter(LBS_DEB_SCAN);
1117
1118         lbs_scan_networks(priv, NULL, 1);
1119         if (priv->surpriseremoved)
1120                 goto out;
1121
1122         found = lbs_find_best_ssid_in_list(priv, preferred_mode);
1123         if (found && (found->ssid_len > 0)) {
1124                 memcpy(out_ssid, &found->ssid, IW_ESSID_MAX_SIZE);
1125                 *out_ssid_len = found->ssid_len;
1126                 *out_mode = found->mode;
1127                 ret = 0;
1128         }
1129
1130 out:
1131         lbs_deb_leave_args(LBS_DEB_SCAN, "ret %d", ret);
1132         return ret;
1133 }
1134
1135
1136 /**
1137  *  @brief Send a scan command for all available channels filtered on a spec
1138  *
1139  *  Used in association code and from debugfs
1140  *
1141  *  @param priv             A pointer to struct lbs_private structure
1142  *  @param ssid             A pointer to the SSID to scan for
1143  *  @param ssid_len         Length of the SSID
1144  *  @param clear_ssid       Should existing scan results with this SSID
1145  *                          be cleared?
1146  *
1147  *  @return                0-success, otherwise fail
1148  */
1149 int lbs_send_specific_ssid_scan(struct lbs_private *priv,
1150                         u8 *ssid, u8 ssid_len, u8 clear_ssid)
1151 {
1152         struct lbs_ioctl_user_scan_cfg scancfg;
1153         int ret = 0;
1154
1155         lbs_deb_enter_args(LBS_DEB_SCAN, "SSID '%s', clear %d",
1156                 escape_essid(ssid, ssid_len), clear_ssid);
1157
1158         if (!ssid_len)
1159                 goto out;
1160
1161         memset(&scancfg, 0x00, sizeof(scancfg));
1162         memcpy(scancfg.ssid, ssid, ssid_len);
1163         scancfg.ssid_len = ssid_len;
1164         scancfg.clear_ssid = clear_ssid;
1165
1166         lbs_scan_networks(priv, &scancfg, 1);
1167         if (priv->surpriseremoved) {
1168                 ret = -1;
1169                 goto out;
1170         }
1171
1172 out:
1173         lbs_deb_leave_args(LBS_DEB_SCAN, "ret %d", ret);
1174         return ret;
1175 }
1176
1177
1178
1179
1180 /*********************************************************************/
1181 /*                                                                   */
1182 /*  Support for Wireless Extensions                                  */
1183 /*                                                                   */
1184 /*********************************************************************/
1185
1186
1187 #define MAX_CUSTOM_LEN 64
1188
1189 static inline char *lbs_translate_scan(struct lbs_private *priv,
1190                                         char *start, char *stop,
1191                                         struct bss_descriptor *bss)
1192 {
1193         struct chan_freq_power *cfp;
1194         char *current_val;      /* For rates */
1195         struct iw_event iwe;    /* Temporary buffer */
1196         int j;
1197 #define PERFECT_RSSI ((u8)50)
1198 #define WORST_RSSI   ((u8)0)
1199 #define RSSI_DIFF    ((u8)(PERFECT_RSSI - WORST_RSSI))
1200         u8 rssi;
1201
1202         lbs_deb_enter(LBS_DEB_SCAN);
1203
1204         cfp = lbs_find_cfp_by_band_and_channel(priv, 0, bss->channel);
1205         if (!cfp) {
1206                 lbs_deb_scan("Invalid channel number %d\n", bss->channel);
1207                 start = NULL;
1208                 goto out;
1209         }
1210
1211         /* First entry *MUST* be the BSSID */
1212         iwe.cmd = SIOCGIWAP;
1213         iwe.u.ap_addr.sa_family = ARPHRD_ETHER;
1214         memcpy(iwe.u.ap_addr.sa_data, &bss->bssid, ETH_ALEN);
1215         start = iwe_stream_add_event(start, stop, &iwe, IW_EV_ADDR_LEN);
1216
1217         /* SSID */
1218         iwe.cmd = SIOCGIWESSID;
1219         iwe.u.data.flags = 1;
1220         iwe.u.data.length = min((u32) bss->ssid_len, (u32) IW_ESSID_MAX_SIZE);
1221         start = iwe_stream_add_point(start, stop, &iwe, bss->ssid);
1222
1223         /* Mode */
1224         iwe.cmd = SIOCGIWMODE;
1225         iwe.u.mode = bss->mode;
1226         start = iwe_stream_add_event(start, stop, &iwe, IW_EV_UINT_LEN);
1227
1228         /* Frequency */
1229         iwe.cmd = SIOCGIWFREQ;
1230         iwe.u.freq.m = (long)cfp->freq * 100000;
1231         iwe.u.freq.e = 1;
1232         start = iwe_stream_add_event(start, stop, &iwe, IW_EV_FREQ_LEN);
1233
1234         /* Add quality statistics */
1235         iwe.cmd = IWEVQUAL;
1236         iwe.u.qual.updated = IW_QUAL_ALL_UPDATED;
1237         iwe.u.qual.level = SCAN_RSSI(bss->rssi);
1238
1239         rssi = iwe.u.qual.level - MRVDRV_NF_DEFAULT_SCAN_VALUE;
1240         iwe.u.qual.qual =
1241             (100 * RSSI_DIFF * RSSI_DIFF - (PERFECT_RSSI - rssi) *
1242              (15 * (RSSI_DIFF) + 62 * (PERFECT_RSSI - rssi))) /
1243             (RSSI_DIFF * RSSI_DIFF);
1244         if (iwe.u.qual.qual > 100)
1245                 iwe.u.qual.qual = 100;
1246
1247         if (priv->NF[TYPE_BEACON][TYPE_NOAVG] == 0) {
1248                 iwe.u.qual.noise = MRVDRV_NF_DEFAULT_SCAN_VALUE;
1249         } else {
1250                 iwe.u.qual.noise =
1251                     CAL_NF(priv->NF[TYPE_BEACON][TYPE_NOAVG]);
1252         }
1253
1254         /* Locally created ad-hoc BSSs won't have beacons if this is the
1255          * only station in the adhoc network; so get signal strength
1256          * from receive statistics.
1257          */
1258         if ((priv->mode == IW_MODE_ADHOC)
1259             && priv->adhoccreate
1260             && !lbs_ssid_cmp(priv->curbssparams.ssid,
1261                                   priv->curbssparams.ssid_len,
1262                                   bss->ssid, bss->ssid_len)) {
1263                 int snr, nf;
1264                 snr = priv->SNR[TYPE_RXPD][TYPE_AVG] / AVG_SCALE;
1265                 nf = priv->NF[TYPE_RXPD][TYPE_AVG] / AVG_SCALE;
1266                 iwe.u.qual.level = CAL_RSSI(snr, nf);
1267         }
1268         start = iwe_stream_add_event(start, stop, &iwe, IW_EV_QUAL_LEN);
1269
1270         /* Add encryption capability */
1271         iwe.cmd = SIOCGIWENCODE;
1272         if (bss->capability & WLAN_CAPABILITY_PRIVACY) {
1273                 iwe.u.data.flags = IW_ENCODE_ENABLED | IW_ENCODE_NOKEY;
1274         } else {
1275                 iwe.u.data.flags = IW_ENCODE_DISABLED;
1276         }
1277         iwe.u.data.length = 0;
1278         start = iwe_stream_add_point(start, stop, &iwe, bss->ssid);
1279
1280         current_val = start + IW_EV_LCP_LEN;
1281
1282         iwe.cmd = SIOCGIWRATE;
1283         iwe.u.bitrate.fixed = 0;
1284         iwe.u.bitrate.disabled = 0;
1285         iwe.u.bitrate.value = 0;
1286
1287         for (j = 0; bss->rates[j] && (j < sizeof(bss->rates)); j++) {
1288                 /* Bit rate given in 500 kb/s units */
1289                 iwe.u.bitrate.value = bss->rates[j] * 500000;
1290                 current_val = iwe_stream_add_value(start, current_val,
1291                                          stop, &iwe, IW_EV_PARAM_LEN);
1292         }
1293         if ((bss->mode == IW_MODE_ADHOC)
1294             && !lbs_ssid_cmp(priv->curbssparams.ssid,
1295                                   priv->curbssparams.ssid_len,
1296                                   bss->ssid, bss->ssid_len)
1297             && priv->adhoccreate) {
1298                 iwe.u.bitrate.value = 22 * 500000;
1299                 current_val = iwe_stream_add_value(start, current_val,
1300                                          stop, &iwe, IW_EV_PARAM_LEN);
1301         }
1302         /* Check if we added any event */
1303         if((current_val - start) > IW_EV_LCP_LEN)
1304                 start = current_val;
1305
1306         memset(&iwe, 0, sizeof(iwe));
1307         if (bss->wpa_ie_len) {
1308                 char buf[MAX_WPA_IE_LEN];
1309                 memcpy(buf, bss->wpa_ie, bss->wpa_ie_len);
1310                 iwe.cmd = IWEVGENIE;
1311                 iwe.u.data.length = bss->wpa_ie_len;
1312                 start = iwe_stream_add_point(start, stop, &iwe, buf);
1313         }
1314
1315         memset(&iwe, 0, sizeof(iwe));
1316         if (bss->rsn_ie_len) {
1317                 char buf[MAX_WPA_IE_LEN];
1318                 memcpy(buf, bss->rsn_ie, bss->rsn_ie_len);
1319                 iwe.cmd = IWEVGENIE;
1320                 iwe.u.data.length = bss->rsn_ie_len;
1321                 start = iwe_stream_add_point(start, stop, &iwe, buf);
1322         }
1323
1324         if (bss->mesh) {
1325                 char custom[MAX_CUSTOM_LEN];
1326                 char *p = custom;
1327
1328                 iwe.cmd = IWEVCUSTOM;
1329                 p += snprintf(p, MAX_CUSTOM_LEN - (p - custom),
1330                               "mesh-type: olpc");
1331                 iwe.u.data.length = p - custom;
1332                 if (iwe.u.data.length)
1333                         start = iwe_stream_add_point(start, stop, &iwe, custom);
1334         }
1335
1336 out:
1337         lbs_deb_leave_args(LBS_DEB_SCAN, "start %p", start);
1338         return start;
1339 }
1340
1341
1342 /**
1343  *  @brief Handle Scan Network ioctl
1344  *
1345  *  @param dev          A pointer to net_device structure
1346  *  @param info         A pointer to iw_request_info structure
1347  *  @param vwrq         A pointer to iw_param structure
1348  *  @param extra        A pointer to extra data buf
1349  *
1350  *  @return             0 --success, otherwise fail
1351  */
1352 int lbs_set_scan(struct net_device *dev, struct iw_request_info *info,
1353                   struct iw_param *wrqu, char *extra)
1354 {
1355         struct lbs_private *priv = dev->priv;
1356
1357         lbs_deb_enter(LBS_DEB_SCAN);
1358
1359         if (!netif_running(dev))
1360                 return -ENETDOWN;
1361
1362         /* mac80211 does this:
1363         struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
1364         if (sdata->type != IEEE80211_IF_TYPE_xxx)
1365                 return -EOPNOTSUPP;
1366
1367         if (wrqu->data.length == sizeof(struct iw_scan_req) &&
1368             wrqu->data.flags & IW_SCAN_THIS_ESSID) {
1369                 req = (struct iw_scan_req *)extra;
1370                         ssid = req->essid;
1371                 ssid_len = req->essid_len;
1372         }
1373         */
1374
1375         if (!delayed_work_pending(&priv->scan_work))
1376                 queue_delayed_work(priv->work_thread, &priv->scan_work,
1377                         msecs_to_jiffies(50));
1378         /* set marker that currently a scan is taking place */
1379         priv->last_scanned_channel = -1;
1380
1381         if (priv->surpriseremoved)
1382                 return -EIO;
1383
1384         lbs_deb_leave(LBS_DEB_SCAN);
1385         return 0;
1386 }
1387
1388
1389 /**
1390  *  @brief  Handle Retrieve scan table ioctl
1391  *
1392  *  @param dev          A pointer to net_device structure
1393  *  @param info         A pointer to iw_request_info structure
1394  *  @param dwrq         A pointer to iw_point structure
1395  *  @param extra        A pointer to extra data buf
1396  *
1397  *  @return             0 --success, otherwise fail
1398  */
1399 int lbs_get_scan(struct net_device *dev, struct iw_request_info *info,
1400                   struct iw_point *dwrq, char *extra)
1401 {
1402 #define SCAN_ITEM_SIZE 128
1403         struct lbs_private *priv = dev->priv;
1404         int err = 0;
1405         char *ev = extra;
1406         char *stop = ev + dwrq->length;
1407         struct bss_descriptor * iter_bss;
1408         struct bss_descriptor * safe;
1409
1410         lbs_deb_enter(LBS_DEB_SCAN);
1411
1412         /* iwlist should wait until the current scan is finished */
1413         if (priv->last_scanned_channel)
1414                 return -EAGAIN;
1415
1416         /* Update RSSI if current BSS is a locally created ad-hoc BSS */
1417         if ((priv->mode == IW_MODE_ADHOC) && priv->adhoccreate) {
1418                 lbs_prepare_and_send_command(priv, CMD_802_11_RSSI, 0,
1419                                         CMD_OPTION_WAITFORRSP, 0, NULL);
1420         }
1421
1422         mutex_lock(&priv->lock);
1423         list_for_each_entry_safe (iter_bss, safe, &priv->network_list, list) {
1424                 char * next_ev;
1425                 unsigned long stale_time;
1426
1427                 if (stop - ev < SCAN_ITEM_SIZE) {
1428                         err = -E2BIG;
1429                         break;
1430                 }
1431
1432                 /* For mesh device, list only mesh networks */
1433                 if (dev == priv->mesh_dev && !iter_bss->mesh)
1434                         continue;
1435
1436                 /* Prune old an old scan result */
1437                 stale_time = iter_bss->last_scanned + DEFAULT_MAX_SCAN_AGE;
1438                 if (time_after(jiffies, stale_time)) {
1439                         list_move_tail (&iter_bss->list,
1440                                         &priv->network_free_list);
1441                         clear_bss_descriptor(iter_bss);
1442                         continue;
1443                 }
1444
1445                 /* Translate to WE format this entry */
1446                 next_ev = lbs_translate_scan(priv, ev, stop, iter_bss);
1447                 if (next_ev == NULL)
1448                         continue;
1449                 ev = next_ev;
1450         }
1451         mutex_unlock(&priv->lock);
1452
1453         dwrq->length = (ev - extra);
1454         dwrq->flags = 0;
1455
1456         lbs_deb_leave_args(LBS_DEB_SCAN, "ret %d", err);
1457         return err;
1458 }
1459
1460
1461
1462
1463 /*********************************************************************/
1464 /*                                                                   */
1465 /*  Command execution                                                */
1466 /*                                                                   */
1467 /*********************************************************************/
1468
1469
1470 /**
1471  *  @brief Prepare a scan command to be sent to the firmware
1472  *
1473  *  Called via lbs_prepare_and_send_command(priv, CMD_802_11_SCAN, ...)
1474  *  from cmd.c
1475  *
1476  *  Sends a fixed lenght data part (specifying the BSS type and BSSID filters)
1477  *  as well as a variable number/length of TLVs to the firmware.
1478  *
1479  *  @param priv       A pointer to struct lbs_private structure
1480  *  @param cmd        A pointer to cmd_ds_command structure to be sent to
1481  *                    firmware with the cmd_DS_801_11_SCAN structure
1482  *  @param pdata_buf  Void pointer cast of a lbs_scan_cmd_config struct used
1483  *                    to set the fields/TLVs for the command sent to firmware
1484  *
1485  *  @return           0 or -1
1486  */
1487 int lbs_cmd_80211_scan(struct lbs_private *priv,
1488         struct cmd_ds_command *cmd, void *pdata_buf)
1489 {
1490         struct cmd_ds_802_11_scan *pscan = &cmd->params.scan;
1491         struct lbs_scan_cmd_config *pscancfg = pdata_buf;
1492
1493         lbs_deb_enter(LBS_DEB_SCAN);
1494
1495         /* Set fixed field variables in scan command */
1496         pscan->bsstype = pscancfg->bsstype;
1497         memcpy(pscan->bssid, pscancfg->bssid, ETH_ALEN);
1498         memcpy(pscan->tlvbuffer, pscancfg->tlvbuffer, pscancfg->tlvbufferlen);
1499
1500         /* size is equal to the sizeof(fixed portions) + the TLV len + header */
1501         cmd->size = cpu_to_le16(sizeof(pscan->bsstype) + ETH_ALEN
1502                                 + pscancfg->tlvbufferlen + S_DS_GEN);
1503
1504         lbs_deb_leave(LBS_DEB_SCAN);
1505         return 0;
1506 }
1507
1508 /**
1509  *  @brief This function handles the command response of scan
1510  *
1511  *  Called from handle_cmd_response() in cmdrespc.
1512  *
1513  *   The response buffer for the scan command has the following
1514  *      memory layout:
1515  *
1516  *     .-----------------------------------------------------------.
1517  *     |  header (4 * sizeof(u16)):  Standard command response hdr |
1518  *     .-----------------------------------------------------------.
1519  *     |  bufsize (u16) : sizeof the BSS Description data          |
1520  *     .-----------------------------------------------------------.
1521  *     |  NumOfSet (u8) : Number of BSS Descs returned             |
1522  *     .-----------------------------------------------------------.
1523  *     |  BSSDescription data (variable, size given in bufsize)    |
1524  *     .-----------------------------------------------------------.
1525  *     |  TLV data (variable, size calculated using header->size,  |
1526  *     |            bufsize and sizeof the fixed fields above)     |
1527  *     .-----------------------------------------------------------.
1528  *
1529  *  @param priv    A pointer to struct lbs_private structure
1530  *  @param resp    A pointer to cmd_ds_command
1531  *
1532  *  @return        0 or -1
1533  */
1534 int lbs_ret_80211_scan(struct lbs_private *priv, struct cmd_ds_command *resp)
1535 {
1536         struct cmd_ds_802_11_scan_rsp *pscan;
1537         struct bss_descriptor * iter_bss;
1538         struct bss_descriptor * safe;
1539         u8 *pbssinfo;
1540         u16 scanrespsize;
1541         int bytesleft;
1542         int idx;
1543         int tlvbufsize;
1544         int ret;
1545
1546         lbs_deb_enter(LBS_DEB_SCAN);
1547
1548         /* Prune old entries from scan table */
1549         list_for_each_entry_safe (iter_bss, safe, &priv->network_list, list) {
1550                 unsigned long stale_time = iter_bss->last_scanned + DEFAULT_MAX_SCAN_AGE;
1551                 if (time_before(jiffies, stale_time))
1552                         continue;
1553                 list_move_tail (&iter_bss->list, &priv->network_free_list);
1554                 clear_bss_descriptor(iter_bss);
1555         }
1556
1557         pscan = &resp->params.scanresp;
1558
1559         if (pscan->nr_sets > MAX_NETWORK_COUNT) {
1560                 lbs_deb_scan(
1561                        "SCAN_RESP: too many scan results (%d, max %d)!!\n",
1562                        pscan->nr_sets, MAX_NETWORK_COUNT);
1563                 ret = -1;
1564                 goto done;
1565         }
1566
1567         bytesleft = le16_to_cpu(pscan->bssdescriptsize);
1568         lbs_deb_scan("SCAN_RESP: bssdescriptsize %d\n", bytesleft);
1569
1570         scanrespsize = le16_to_cpu(resp->size);
1571         lbs_deb_scan("SCAN_RESP: scan results %d\n", pscan->nr_sets);
1572
1573         pbssinfo = pscan->bssdesc_and_tlvbuffer;
1574
1575         /* The size of the TLV buffer is equal to the entire command response
1576          *   size (scanrespsize) minus the fixed fields (sizeof()'s), the
1577          *   BSS Descriptions (bssdescriptsize as bytesLef) and the command
1578          *   response header (S_DS_GEN)
1579          */
1580         tlvbufsize = scanrespsize - (bytesleft + sizeof(pscan->bssdescriptsize)
1581                                      + sizeof(pscan->nr_sets)
1582                                      + S_DS_GEN);
1583
1584         /*
1585          *  Process each scan response returned (pscan->nr_sets).  Save
1586          *    the information in the newbssentry and then insert into the
1587          *    driver scan table either as an update to an existing entry
1588          *    or as an addition at the end of the table
1589          */
1590         for (idx = 0; idx < pscan->nr_sets && bytesleft; idx++) {
1591                 struct bss_descriptor new;
1592                 struct bss_descriptor * found = NULL;
1593                 struct bss_descriptor * oldest = NULL;
1594                 DECLARE_MAC_BUF(mac);
1595
1596                 /* Process the data fields and IEs returned for this BSS */
1597                 memset(&new, 0, sizeof (struct bss_descriptor));
1598                 if (lbs_process_bss(&new, &pbssinfo, &bytesleft) != 0) {
1599                         /* error parsing the scan response, skipped */
1600                         lbs_deb_scan("SCAN_RESP: process_bss returned ERROR\n");
1601                         continue;
1602                 }
1603
1604                 /* Try to find this bss in the scan table */
1605                 list_for_each_entry (iter_bss, &priv->network_list, list) {
1606                         if (is_same_network(iter_bss, &new)) {
1607                                 found = iter_bss;
1608                                 break;
1609                         }
1610
1611                         if ((oldest == NULL) ||
1612                             (iter_bss->last_scanned < oldest->last_scanned))
1613                                 oldest = iter_bss;
1614                 }
1615
1616                 if (found) {
1617                         /* found, clear it */
1618                         clear_bss_descriptor(found);
1619                 } else if (!list_empty(&priv->network_free_list)) {
1620                         /* Pull one from the free list */
1621                         found = list_entry(priv->network_free_list.next,
1622                                            struct bss_descriptor, list);
1623                         list_move_tail(&found->list, &priv->network_list);
1624                 } else if (oldest) {
1625                         /* If there are no more slots, expire the oldest */
1626                         found = oldest;
1627                         clear_bss_descriptor(found);
1628                         list_move_tail(&found->list, &priv->network_list);
1629                 } else {
1630                         continue;
1631                 }
1632
1633                 lbs_deb_scan("SCAN_RESP: BSSID %s\n",
1634                              print_mac(mac, new.bssid));
1635
1636                 /* Copy the locally created newbssentry to the scan table */
1637                 memcpy(found, &new, offsetof(struct bss_descriptor, list));
1638         }
1639
1640         ret = 0;
1641
1642 done:
1643         lbs_deb_leave_args(LBS_DEB_SCAN, "ret %d", ret);
1644         return ret;
1645 }