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[PATCH] libertas: fix 'keep previous scan' behavior
[GitHub/mt8127/android_kernel_alcatel_ttab.git] / drivers / net / wireless / libertas / scan.c
1 /**
2 * Functions implementing wlan scan IOCTL and firmware command APIs
3 *
4 * IOCTL handlers as well as command preperation and response routines
5 * for sending scan commands to the firmware.
6 */
7 #include <linux/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 "host.h"
17 #include "decl.h"
18 #include "dev.h"
19 #include "scan.h"
20
21 //! Approximate amount of data needed to pass a scan result back to iwlist
22 #define MAX_SCAN_CELL_SIZE (IW_EV_ADDR_LEN \
23 + IW_ESSID_MAX_SIZE \
24 + IW_EV_UINT_LEN \
25 + IW_EV_FREQ_LEN \
26 + IW_EV_QUAL_LEN \
27 + IW_ESSID_MAX_SIZE \
28 + IW_EV_PARAM_LEN \
29 + 40) /* 40 for WPAIE */
30
31 //! Memory needed to store a max sized channel List TLV for a firmware scan
32 #define CHAN_TLV_MAX_SIZE (sizeof(struct mrvlietypesheader) \
33 + (MRVDRV_MAX_CHANNELS_PER_SCAN \
34 * sizeof(struct chanscanparamset)))
35
36 //! Memory needed to store a max number/size SSID TLV for a firmware scan
37 #define SSID_TLV_MAX_SIZE (1 * sizeof(struct mrvlietypes_ssidparamset))
38
39 //! Maximum memory needed for a wlan_scan_cmd_config with all TLVs at max
40 #define MAX_SCAN_CFG_ALLOC (sizeof(struct wlan_scan_cmd_config) \
41 + sizeof(struct mrvlietypes_numprobes) \
42 + CHAN_TLV_MAX_SIZE \
43 + SSID_TLV_MAX_SIZE)
44
45 //! The maximum number of channels the firmware can scan per command
46 #define MRVDRV_MAX_CHANNELS_PER_SCAN 14
47
48 /**
49 * @brief Number of channels to scan per firmware scan command issuance.
50 *
51 * Number restricted to prevent hitting the limit on the amount of scan data
52 * returned in a single firmware scan command.
53 */
54 #define MRVDRV_CHANNELS_PER_SCAN_CMD 4
55
56 //! Scan time specified in the channel TLV for each channel for passive scans
57 #define MRVDRV_PASSIVE_SCAN_CHAN_TIME 100
58
59 //! Scan time specified in the channel TLV for each channel for active scans
60 #define MRVDRV_ACTIVE_SCAN_CHAN_TIME 100
61
62 const u8 zeromac[ETH_ALEN] = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
63 const u8 bcastmac[ETH_ALEN] = { 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF };
64
65 static inline void clear_bss_descriptor (struct bss_descriptor * bss)
66 {
67 /* Don't blow away ->list, just BSS data */
68 memset(bss, 0, offsetof(struct bss_descriptor, list));
69 }
70
71 static inline int match_bss_no_security(struct wlan_802_11_security * secinfo,
72 struct bss_descriptor * match_bss)
73 {
74 if ( !secinfo->wep_enabled
75 && !secinfo->WPAenabled
76 && !secinfo->WPA2enabled
77 && match_bss->wpa_ie[0] != WPA_IE
78 && match_bss->rsn_ie[0] != WPA2_IE
79 && !match_bss->privacy) {
80 return 1;
81 }
82 return 0;
83 }
84
85 static inline int match_bss_static_wep(struct wlan_802_11_security * secinfo,
86 struct bss_descriptor * match_bss)
87 {
88 if ( secinfo->wep_enabled
89 && !secinfo->WPAenabled
90 && !secinfo->WPA2enabled
91 && match_bss->privacy) {
92 return 1;
93 }
94 return 0;
95 }
96
97 static inline int match_bss_wpa(struct wlan_802_11_security * secinfo,
98 struct bss_descriptor * match_bss)
99 {
100 if ( !secinfo->wep_enabled
101 && secinfo->WPAenabled
102 && !secinfo->WPA2enabled
103 && (match_bss->wpa_ie[0] == WPA_IE)
104 /* privacy bit may NOT be set in some APs like LinkSys WRT54G
105 && bss->privacy */
106 ) {
107 return 1;
108 }
109 return 0;
110 }
111
112 static inline int match_bss_wpa2(struct wlan_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->rsn_ie[0] == WPA2_IE)
119 /* privacy bit may NOT be set in some APs like LinkSys WRT54G
120 && bss->privacy */
121 ) {
122 return 1;
123 }
124 return 0;
125 }
126
127 static inline int match_bss_dynamic_wep(struct wlan_802_11_security * secinfo,
128 struct bss_descriptor * match_bss)
129 {
130 if ( !secinfo->wep_enabled
131 && !secinfo->WPAenabled
132 && !secinfo->WPA2enabled
133 && (match_bss->wpa_ie[0] != WPA_IE)
134 && (match_bss->rsn_ie[0] != WPA2_IE)
135 && match_bss->privacy) {
136 return 1;
137 }
138 return 0;
139 }
140
141 /**
142 * @brief Check if a scanned network compatible with the driver settings
143 *
144 * WEP WPA WPA2 ad-hoc encrypt Network
145 * enabled enabled enabled AES mode privacy WPA WPA2 Compatible
146 * 0 0 0 0 NONE 0 0 0 yes No security
147 * 1 0 0 0 NONE 1 0 0 yes Static WEP
148 * 0 1 0 0 x 1x 1 x yes WPA
149 * 0 0 1 0 x 1x x 1 yes WPA2
150 * 0 0 0 1 NONE 1 0 0 yes Ad-hoc AES
151 * 0 0 0 0 !=NONE 1 0 0 yes Dynamic WEP
152 *
153 *
154 * @param adapter A pointer to wlan_adapter
155 * @param index Index in scantable to check against current driver settings
156 * @param mode Network mode: Infrastructure or IBSS
157 *
158 * @return Index in scantable, or error code if negative
159 */
160 static int is_network_compatible(wlan_adapter * adapter,
161 struct bss_descriptor * bss, u8 mode)
162 {
163 int matched = 0;
164
165 lbs_deb_enter(LBS_DEB_ASSOC);
166
167 if (bss->mode != mode)
168 goto done;
169
170 if ((matched = match_bss_no_security(&adapter->secinfo, bss))) {
171 goto done;
172 } else if ((matched = match_bss_static_wep(&adapter->secinfo, bss))) {
173 goto done;
174 } else if ((matched = match_bss_wpa(&adapter->secinfo, bss))) {
175 lbs_deb_scan(
176 "is_network_compatible() WPA: wpa_ie=%#x "
177 "wpa2_ie=%#x WEP=%s WPA=%s WPA2=%s "
178 "privacy=%#x\n", bss->wpa_ie[0], bss->rsn_ie[0],
179 adapter->secinfo.wep_enabled ? "e" : "d",
180 adapter->secinfo.WPAenabled ? "e" : "d",
181 adapter->secinfo.WPA2enabled ? "e" : "d",
182 bss->privacy);
183 goto done;
184 } else if ((matched = match_bss_wpa2(&adapter->secinfo, bss))) {
185 lbs_deb_scan(
186 "is_network_compatible() WPA2: wpa_ie=%#x "
187 "wpa2_ie=%#x WEP=%s WPA=%s WPA2=%s "
188 "privacy=%#x\n", bss->wpa_ie[0], bss->rsn_ie[0],
189 adapter->secinfo.wep_enabled ? "e" : "d",
190 adapter->secinfo.WPAenabled ? "e" : "d",
191 adapter->secinfo.WPA2enabled ? "e" : "d",
192 bss->privacy);
193 goto done;
194 } else if ((matched = match_bss_dynamic_wep(&adapter->secinfo, bss))) {
195 lbs_deb_scan(
196 "is_network_compatible() dynamic WEP: "
197 "wpa_ie=%#x wpa2_ie=%#x privacy=%#x\n",
198 bss->wpa_ie[0],
199 bss->rsn_ie[0],
200 bss->privacy);
201 goto done;
202 }
203
204 /* bss security settings don't match those configured on card */
205 lbs_deb_scan(
206 "is_network_compatible() FAILED: wpa_ie=%#x "
207 "wpa2_ie=%#x WEP=%s WPA=%s WPA2=%s privacy=%#x\n",
208 bss->wpa_ie[0], bss->rsn_ie[0],
209 adapter->secinfo.wep_enabled ? "e" : "d",
210 adapter->secinfo.WPAenabled ? "e" : "d",
211 adapter->secinfo.WPA2enabled ? "e" : "d",
212 bss->privacy);
213
214 done:
215 lbs_deb_leave(LBS_DEB_SCAN);
216 return matched;
217 }
218
219 /**
220 * @brief Post process the scan table after a new scan command has completed
221 *
222 * Inspect each entry of the scan table and try to find an entry that
223 * matches our current associated/joined network from the scan. If
224 * one is found, update the stored copy of the bssdescriptor for our
225 * current network.
226 *
227 * Debug dump the current scan table contents if compiled accordingly.
228 *
229 * @param priv A pointer to wlan_private structure
230 *
231 * @return void
232 */
233 static void wlan_scan_process_results(wlan_private * priv)
234 {
235 wlan_adapter *adapter = priv->adapter;
236 struct bss_descriptor * iter_bss;
237
238 mutex_lock(&adapter->lock);
239
240 if (adapter->connect_status != libertas_connected)
241 goto debug_print;
242
243 /* try to find the current BSSID in the scan list */
244 list_for_each_entry (iter_bss, &adapter->network_list, list) {
245 if (libertas_SSID_cmp(&iter_bss->ssid, &adapter->curbssparams.ssid))
246 continue;
247 if (memcmp(adapter->curbssparams.bssid, iter_bss->bssid, ETH_ALEN))
248 continue;
249 /* Make a copy of current BSSID descriptor */
250 memcpy(&adapter->curbssparams.bssdescriptor, iter_bss,
251 sizeof(struct bss_descriptor));
252 break;
253 }
254
255 debug_print:
256 list_for_each_entry (iter_bss, &adapter->network_list, list) {
257 lbs_deb_scan("Scan:(%02d) " MAC_FMT ", RSSI[%03d], SSID[%s]\n",
258 i++,
259 iter_bss->bssid[0], iter_bss->bssid[1], iter_bss->bssid[2],
260 iter_bss->bssid[3], iter_bss->bssid[4], iter_bss->bssid[5],
261 (s32) iter_bss->rssi, iter_bss->ssid.ssid);
262 }
263
264 mutex_unlock(&adapter->lock);
265 }
266
267 /**
268 * @brief Create a channel list for the driver to scan based on region info
269 *
270 * Use the driver region/band information to construct a comprehensive list
271 * of channels to scan. This routine is used for any scan that is not
272 * provided a specific channel list to scan.
273 *
274 * @param priv A pointer to wlan_private structure
275 * @param scanchanlist Output parameter: resulting channel list to scan
276 * @param filteredscan Flag indicating whether or not a BSSID or SSID filter
277 * is being sent in the command to firmware. Used to
278 * increase the number of channels sent in a scan
279 * command and to disable the firmware channel scan
280 * filter.
281 *
282 * @return void
283 */
284 static void wlan_scan_create_channel_list(wlan_private * priv,
285 struct chanscanparamset * scanchanlist,
286 u8 filteredscan)
287 {
288
289 wlan_adapter *adapter = priv->adapter;
290 struct region_channel *scanregion;
291 struct chan_freq_power *cfp;
292 int rgnidx;
293 int chanidx;
294 int nextchan;
295 u8 scantype;
296
297 chanidx = 0;
298
299 /* Set the default scan type to the user specified type, will later
300 * be changed to passive on a per channel basis if restricted by
301 * regulatory requirements (11d or 11h)
302 */
303 scantype = adapter->scantype;
304
305 for (rgnidx = 0; rgnidx < ARRAY_SIZE(adapter->region_channel); rgnidx++) {
306 if (priv->adapter->enable11d &&
307 adapter->connect_status != libertas_connected) {
308 /* Scan all the supported chan for the first scan */
309 if (!adapter->universal_channel[rgnidx].valid)
310 continue;
311 scanregion = &adapter->universal_channel[rgnidx];
312
313 /* clear the parsed_region_chan for the first scan */
314 memset(&adapter->parsed_region_chan, 0x00,
315 sizeof(adapter->parsed_region_chan));
316 } else {
317 if (!adapter->region_channel[rgnidx].valid)
318 continue;
319 scanregion = &adapter->region_channel[rgnidx];
320 }
321
322 for (nextchan = 0;
323 nextchan < scanregion->nrcfp; nextchan++, chanidx++) {
324
325 cfp = scanregion->CFP + nextchan;
326
327 if (priv->adapter->enable11d) {
328 scantype =
329 libertas_get_scan_type_11d(cfp->channel,
330 &adapter->
331 parsed_region_chan);
332 }
333
334 switch (scanregion->band) {
335 case BAND_B:
336 case BAND_G:
337 default:
338 scanchanlist[chanidx].radiotype =
339 cmd_scan_radio_type_bg;
340 break;
341 }
342
343 if (scantype == cmd_scan_type_passive) {
344 scanchanlist[chanidx].maxscantime =
345 cpu_to_le16
346 (MRVDRV_PASSIVE_SCAN_CHAN_TIME);
347 scanchanlist[chanidx].chanscanmode.passivescan =
348 1;
349 } else {
350 scanchanlist[chanidx].maxscantime =
351 cpu_to_le16
352 (MRVDRV_ACTIVE_SCAN_CHAN_TIME);
353 scanchanlist[chanidx].chanscanmode.passivescan =
354 0;
355 }
356
357 scanchanlist[chanidx].channumber = cfp->channel;
358
359 if (filteredscan) {
360 scanchanlist[chanidx].chanscanmode.
361 disablechanfilt = 1;
362 }
363 }
364 }
365 }
366
367 /**
368 * @brief Construct a wlan_scan_cmd_config structure to use in issue scan cmds
369 *
370 * Application layer or other functions can invoke wlan_scan_networks
371 * with a scan configuration supplied in a wlan_ioctl_user_scan_cfg struct.
372 * This structure is used as the basis of one or many wlan_scan_cmd_config
373 * commands that are sent to the command processing module and sent to
374 * firmware.
375 *
376 * Create a wlan_scan_cmd_config based on the following user supplied
377 * parameters (if present):
378 * - SSID filter
379 * - BSSID filter
380 * - Number of Probes to be sent
381 * - channel list
382 *
383 * If the SSID or BSSID filter is not present, disable/clear the filter.
384 * If the number of probes is not set, use the adapter default setting
385 * Qualify the channel
386 *
387 * @param priv A pointer to wlan_private structure
388 * @param puserscanin NULL or pointer to scan configuration parameters
389 * @param ppchantlvout Output parameter: Pointer to the start of the
390 * channel TLV portion of the output scan config
391 * @param pscanchanlist Output parameter: Pointer to the resulting channel
392 * list to scan
393 * @param pmaxchanperscan Output parameter: Number of channels to scan for
394 * each issuance of the firmware scan command
395 * @param pfilteredscan Output parameter: Flag indicating whether or not
396 * a BSSID or SSID filter is being sent in the
397 * command to firmware. Used to increase the number
398 * of channels sent in a scan command and to
399 * disable the firmware channel scan filter.
400 * @param pscancurrentonly Output parameter: Flag indicating whether or not
401 * we are only scanning our current active channel
402 *
403 * @return resulting scan configuration
404 */
405 static struct wlan_scan_cmd_config *
406 wlan_scan_setup_scan_config(wlan_private * priv,
407 const struct wlan_ioctl_user_scan_cfg * puserscanin,
408 struct mrvlietypes_chanlistparamset ** ppchantlvout,
409 struct chanscanparamset * pscanchanlist,
410 int *pmaxchanperscan,
411 u8 * pfilteredscan,
412 u8 * pscancurrentonly)
413 {
414 wlan_adapter *adapter = priv->adapter;
415 struct mrvlietypes_numprobes *pnumprobestlv;
416 struct mrvlietypes_ssidparamset *pssidtlv;
417 struct wlan_scan_cmd_config * pscancfgout = NULL;
418 u8 *ptlvpos;
419 u16 numprobes;
420 int chanidx;
421 int scantype;
422 int scandur;
423 int channel;
424 int radiotype;
425
426 pscancfgout = kzalloc(MAX_SCAN_CFG_ALLOC, GFP_KERNEL);
427 if (pscancfgout == NULL)
428 goto out;
429
430 /* The tlvbufferlen is calculated for each scan command. The TLVs added
431 * in this routine will be preserved since the routine that sends
432 * the command will append channelTLVs at *ppchantlvout. The difference
433 * between the *ppchantlvout and the tlvbuffer start will be used
434 * to calculate the size of anything we add in this routine.
435 */
436 pscancfgout->tlvbufferlen = 0;
437
438 /* Running tlv pointer. Assigned to ppchantlvout at end of function
439 * so later routines know where channels can be added to the command buf
440 */
441 ptlvpos = pscancfgout->tlvbuffer;
442
443 /*
444 * Set the initial scan paramters for progressive scanning. If a specific
445 * BSSID or SSID is used, the number of channels in the scan command
446 * will be increased to the absolute maximum
447 */
448 *pmaxchanperscan = MRVDRV_CHANNELS_PER_SCAN_CMD;
449
450 /* Initialize the scan as un-filtered by firmware, set to TRUE below if
451 * a SSID or BSSID filter is sent in the command
452 */
453 *pfilteredscan = 0;
454
455 /* Initialize the scan as not being only on the current channel. If
456 * the channel list is customized, only contains one channel, and
457 * is the active channel, this is set true and data flow is not halted.
458 */
459 *pscancurrentonly = 0;
460
461 if (puserscanin) {
462
463 /* Set the bss type scan filter, use adapter setting if unset */
464 pscancfgout->bsstype =
465 (puserscanin->bsstype ? puserscanin->bsstype : adapter->
466 scanmode);
467
468 /* Set the number of probes to send, use adapter setting if unset */
469 numprobes = (puserscanin->numprobes ? puserscanin->numprobes :
470 adapter->scanprobes);
471
472 /*
473 * Set the BSSID filter to the incoming configuration,
474 * if non-zero. If not set, it will remain disabled (all zeros).
475 */
476 memcpy(pscancfgout->bssid, puserscanin->bssid,
477 sizeof(pscancfgout->bssid));
478
479 if (puserscanin->ssid_len) {
480 pssidtlv =
481 (struct mrvlietypes_ssidparamset *) pscancfgout->
482 tlvbuffer;
483 pssidtlv->header.type = cpu_to_le16(TLV_TYPE_SSID);
484 pssidtlv->header.len = cpu_to_le16(puserscanin->ssid_len);
485 memcpy(pssidtlv->ssid, puserscanin->ssid,
486 puserscanin->ssid_len);
487 ptlvpos += sizeof(pssidtlv->header) + puserscanin->ssid_len;
488 }
489
490 /*
491 * The default number of channels sent in the command is low to
492 * ensure the response buffer from the firmware does not truncate
493 * scan results. That is not an issue with an SSID or BSSID
494 * filter applied to the scan results in the firmware.
495 */
496 if ( puserscanin->ssid_len
497 || (compare_ether_addr(pscancfgout->bssid, &zeromac[0]) != 0)) {
498 *pmaxchanperscan = MRVDRV_MAX_CHANNELS_PER_SCAN;
499 *pfilteredscan = 1;
500 }
501 } else {
502 pscancfgout->bsstype = adapter->scanmode;
503 numprobes = adapter->scanprobes;
504 }
505
506 /* If the input config or adapter has the number of Probes set, add tlv */
507 if (numprobes) {
508 pnumprobestlv = (struct mrvlietypes_numprobes *) ptlvpos;
509 pnumprobestlv->header.type =
510 cpu_to_le16(TLV_TYPE_NUMPROBES);
511 pnumprobestlv->header.len = sizeof(pnumprobestlv->numprobes);
512 pnumprobestlv->numprobes = cpu_to_le16(numprobes);
513
514 ptlvpos +=
515 sizeof(pnumprobestlv->header) + pnumprobestlv->header.len;
516
517 pnumprobestlv->header.len =
518 cpu_to_le16(pnumprobestlv->header.len);
519 }
520
521 /*
522 * Set the output for the channel TLV to the address in the tlv buffer
523 * past any TLVs that were added in this fuction (SSID, numprobes).
524 * channel TLVs will be added past this for each scan command, preserving
525 * the TLVs that were previously added.
526 */
527 *ppchantlvout = (struct mrvlietypes_chanlistparamset *) ptlvpos;
528
529 if (puserscanin && puserscanin->chanlist[0].channumber) {
530
531 lbs_deb_scan("Scan: Using supplied channel list\n");
532
533 for (chanidx = 0;
534 chanidx < WLAN_IOCTL_USER_SCAN_CHAN_MAX
535 && puserscanin->chanlist[chanidx].channumber; chanidx++) {
536
537 channel = puserscanin->chanlist[chanidx].channumber;
538 (pscanchanlist + chanidx)->channumber = channel;
539
540 radiotype = puserscanin->chanlist[chanidx].radiotype;
541 (pscanchanlist + chanidx)->radiotype = radiotype;
542
543 scantype = puserscanin->chanlist[chanidx].scantype;
544
545 if (scantype == cmd_scan_type_passive) {
546 (pscanchanlist +
547 chanidx)->chanscanmode.passivescan = 1;
548 } else {
549 (pscanchanlist +
550 chanidx)->chanscanmode.passivescan = 0;
551 }
552
553 if (puserscanin->chanlist[chanidx].scantime) {
554 scandur =
555 puserscanin->chanlist[chanidx].scantime;
556 } else {
557 if (scantype == cmd_scan_type_passive) {
558 scandur = MRVDRV_PASSIVE_SCAN_CHAN_TIME;
559 } else {
560 scandur = MRVDRV_ACTIVE_SCAN_CHAN_TIME;
561 }
562 }
563
564 (pscanchanlist + chanidx)->minscantime =
565 cpu_to_le16(scandur);
566 (pscanchanlist + chanidx)->maxscantime =
567 cpu_to_le16(scandur);
568 }
569
570 /* Check if we are only scanning the current channel */
571 if ((chanidx == 1) && (puserscanin->chanlist[0].channumber
572 ==
573 priv->adapter->curbssparams.channel)) {
574 *pscancurrentonly = 1;
575 lbs_deb_scan("Scan: Scanning current channel only");
576 }
577
578 } else {
579 lbs_deb_scan("Scan: Creating full region channel list\n");
580 wlan_scan_create_channel_list(priv, pscanchanlist,
581 *pfilteredscan);
582 }
583
584 out:
585 return pscancfgout;
586 }
587
588 /**
589 * @brief Construct and send multiple scan config commands to the firmware
590 *
591 * Previous routines have created a wlan_scan_cmd_config with any requested
592 * TLVs. This function splits the channel TLV into maxchanperscan lists
593 * and sends the portion of the channel TLV along with the other TLVs
594 * to the wlan_cmd routines for execution in the firmware.
595 *
596 * @param priv A pointer to wlan_private structure
597 * @param maxchanperscan Maximum number channels to be included in each
598 * scan command sent to firmware
599 * @param filteredscan Flag indicating whether or not a BSSID or SSID
600 * filter is being used for the firmware command
601 * scan command sent to firmware
602 * @param pscancfgout Scan configuration used for this scan.
603 * @param pchantlvout Pointer in the pscancfgout where the channel TLV
604 * should start. This is past any other TLVs that
605 * must be sent down in each firmware command.
606 * @param pscanchanlist List of channels to scan in maxchanperscan segments
607 *
608 * @return 0 or error return otherwise
609 */
610 static int wlan_scan_channel_list(wlan_private * priv,
611 int maxchanperscan,
612 u8 filteredscan,
613 struct wlan_scan_cmd_config * pscancfgout,
614 struct mrvlietypes_chanlistparamset * pchantlvout,
615 struct chanscanparamset * pscanchanlist,
616 const struct wlan_ioctl_user_scan_cfg * puserscanin,
617 int full_scan)
618 {
619 struct chanscanparamset *ptmpchan;
620 struct chanscanparamset *pstartchan;
621 u8 scanband;
622 int doneearly;
623 int tlvidx;
624 int ret = 0;
625 int scanned = 0;
626 union iwreq_data wrqu;
627
628 lbs_deb_enter(LBS_DEB_ASSOC);
629
630 if (pscancfgout == 0 || pchantlvout == 0 || pscanchanlist == 0) {
631 lbs_deb_scan("Scan: Null detect: %p, %p, %p\n",
632 pscancfgout, pchantlvout, pscanchanlist);
633 return -1;
634 }
635
636 pchantlvout->header.type = cpu_to_le16(TLV_TYPE_CHANLIST);
637
638 /* Set the temp channel struct pointer to the start of the desired list */
639 ptmpchan = pscanchanlist;
640
641 if (priv->adapter->last_scanned_channel && !puserscanin)
642 ptmpchan += priv->adapter->last_scanned_channel;
643
644 /* Loop through the desired channel list, sending a new firmware scan
645 * commands for each maxchanperscan channels (or for 1,6,11 individually
646 * if configured accordingly)
647 */
648 while (ptmpchan->channumber) {
649
650 tlvidx = 0;
651 pchantlvout->header.len = 0;
652 scanband = ptmpchan->radiotype;
653 pstartchan = ptmpchan;
654 doneearly = 0;
655
656 /* Construct the channel TLV for the scan command. Continue to
657 * insert channel TLVs until:
658 * - the tlvidx hits the maximum configured per scan command
659 * - the next channel to insert is 0 (end of desired channel list)
660 * - doneearly is set (controlling individual scanning of 1,6,11)
661 */
662 while (tlvidx < maxchanperscan && ptmpchan->channumber
663 && !doneearly && scanned < 2) {
664
665 lbs_deb_scan(
666 "Scan: Chan(%3d), Radio(%d), mode(%d,%d), Dur(%d)\n",
667 ptmpchan->channumber, ptmpchan->radiotype,
668 ptmpchan->chanscanmode.passivescan,
669 ptmpchan->chanscanmode.disablechanfilt,
670 ptmpchan->maxscantime);
671
672 /* Copy the current channel TLV to the command being prepared */
673 memcpy(pchantlvout->chanscanparam + tlvidx,
674 ptmpchan, sizeof(pchantlvout->chanscanparam));
675
676 /* Increment the TLV header length by the size appended */
677 pchantlvout->header.len +=
678 sizeof(pchantlvout->chanscanparam);
679
680 /*
681 * The tlv buffer length is set to the number of bytes of the
682 * between the channel tlv pointer and the start of the
683 * tlv buffer. This compensates for any TLVs that were appended
684 * before the channel list.
685 */
686 pscancfgout->tlvbufferlen = ((u8 *) pchantlvout
687 - pscancfgout->tlvbuffer);
688
689 /* Add the size of the channel tlv header and the data length */
690 pscancfgout->tlvbufferlen +=
691 (sizeof(pchantlvout->header)
692 + pchantlvout->header.len);
693
694 /* Increment the index to the channel tlv we are constructing */
695 tlvidx++;
696
697 doneearly = 0;
698
699 /* Stop the loop if the *current* channel is in the 1,6,11 set
700 * and we are not filtering on a BSSID or SSID.
701 */
702 if (!filteredscan && (ptmpchan->channumber == 1
703 || ptmpchan->channumber == 6
704 || ptmpchan->channumber == 11)) {
705 doneearly = 1;
706 }
707
708 /* Increment the tmp pointer to the next channel to be scanned */
709 ptmpchan++;
710 scanned++;
711
712 /* Stop the loop if the *next* channel is in the 1,6,11 set.
713 * This will cause it to be the only channel scanned on the next
714 * interation
715 */
716 if (!filteredscan && (ptmpchan->channumber == 1
717 || ptmpchan->channumber == 6
718 || ptmpchan->channumber == 11)) {
719 doneearly = 1;
720 }
721 }
722
723 /* Send the scan command to the firmware with the specified cfg */
724 ret = libertas_prepare_and_send_command(priv, cmd_802_11_scan, 0,
725 0, 0, pscancfgout);
726 if (scanned >= 2 && !full_scan) {
727 priv->adapter->last_scanned_channel = ptmpchan->channumber;
728 ret = 0;
729 goto done;
730 }
731 scanned = 0;
732 }
733
734 priv->adapter->last_scanned_channel = ptmpchan->channumber;
735
736 memset(&wrqu, 0, sizeof(union iwreq_data));
737 wireless_send_event(priv->dev, SIOCGIWSCAN, &wrqu, NULL);
738
739 done:
740 lbs_deb_leave_args(LBS_DEB_SCAN, "ret %d", ret);
741 return ret;
742 }
743
744 static void
745 clear_selected_scan_list_entries(wlan_adapter * adapter,
746 const struct wlan_ioctl_user_scan_cfg * scan_cfg)
747 {
748 struct bss_descriptor * bss;
749 struct bss_descriptor * safe;
750 u32 clear_ssid_flag = 0, clear_bssid_flag = 0;
751
752 if (!scan_cfg)
753 return;
754
755 if (scan_cfg->clear_ssid && scan_cfg->ssid_len)
756 clear_ssid_flag = 1;
757
758 if (scan_cfg->clear_bssid
759 && (compare_ether_addr(scan_cfg->bssid, &zeromac[0]) != 0)
760 && (compare_ether_addr(scan_cfg->bssid, &bcastmac[0]) != 0)) {
761 clear_bssid_flag = 1;
762 }
763
764 if (!clear_ssid_flag && !clear_bssid_flag)
765 return;
766
767 mutex_lock(&adapter->lock);
768 list_for_each_entry_safe (bss, safe, &adapter->network_list, list) {
769 u32 clear = 0;
770
771 /* Check for an SSID match */
772 if ( clear_ssid_flag
773 && (bss->ssid.ssidlength == scan_cfg->ssid_len)
774 && !memcmp(bss->ssid.ssid, scan_cfg->ssid, bss->ssid.ssidlength))
775 clear = 1;
776
777 /* Check for a BSSID match */
778 if ( clear_bssid_flag
779 && !compare_ether_addr(bss->bssid, scan_cfg->bssid))
780 clear = 1;
781
782 if (clear) {
783 list_move_tail (&bss->list, &adapter->network_free_list);
784 clear_bss_descriptor(bss);
785 }
786 }
787 mutex_unlock(&adapter->lock);
788 }
789
790
791 /**
792 * @brief Internal function used to start a scan based on an input config
793 *
794 * Use the input user scan configuration information when provided in
795 * order to send the appropriate scan commands to firmware to populate or
796 * update the internal driver scan table
797 *
798 * @param priv A pointer to wlan_private structure
799 * @param puserscanin Pointer to the input configuration for the requested
800 * scan.
801 *
802 * @return 0 or < 0 if error
803 */
804 int wlan_scan_networks(wlan_private * priv,
805 const struct wlan_ioctl_user_scan_cfg * puserscanin,
806 int full_scan)
807 {
808 wlan_adapter * adapter = priv->adapter;
809 struct mrvlietypes_chanlistparamset *pchantlvout;
810 struct chanscanparamset * scan_chan_list = NULL;
811 struct wlan_scan_cmd_config * scan_cfg = NULL;
812 u8 filteredscan;
813 u8 scancurrentchanonly;
814 int maxchanperscan;
815 int ret;
816
817 lbs_deb_enter(LBS_DEB_ASSOC);
818
819 scan_chan_list = kzalloc(sizeof(struct chanscanparamset) *
820 WLAN_IOCTL_USER_SCAN_CHAN_MAX, GFP_KERNEL);
821 if (scan_chan_list == NULL) {
822 ret = -ENOMEM;
823 goto out;
824 }
825
826 scan_cfg = wlan_scan_setup_scan_config(priv,
827 puserscanin,
828 &pchantlvout,
829 scan_chan_list,
830 &maxchanperscan,
831 &filteredscan,
832 &scancurrentchanonly);
833 if (scan_cfg == NULL) {
834 ret = -ENOMEM;
835 goto out;
836 }
837
838 clear_selected_scan_list_entries(adapter, puserscanin);
839
840 /* Keep the data path active if we are only scanning our current channel */
841 if (!scancurrentchanonly) {
842 netif_stop_queue(priv->dev);
843 netif_carrier_off(priv->dev);
844 netif_stop_queue(priv->mesh_dev);
845 netif_carrier_off(priv->mesh_dev);
846 }
847
848 ret = wlan_scan_channel_list(priv,
849 maxchanperscan,
850 filteredscan,
851 scan_cfg,
852 pchantlvout,
853 scan_chan_list,
854 puserscanin,
855 full_scan);
856
857 /* Process the resulting scan table:
858 * - Remove any bad ssids
859 * - Update our current BSS information from scan data
860 */
861 wlan_scan_process_results(priv);
862
863 if (priv->adapter->connect_status == libertas_connected) {
864 netif_carrier_on(priv->dev);
865 netif_wake_queue(priv->dev);
866 netif_carrier_on(priv->mesh_dev);
867 netif_wake_queue(priv->mesh_dev);
868 }
869
870 out:
871 if (scan_cfg)
872 kfree(scan_cfg);
873
874 if (scan_chan_list)
875 kfree(scan_chan_list);
876
877 lbs_deb_leave_args(LBS_DEB_SCAN, "ret %d", ret);
878 return ret;
879 }
880
881 /**
882 * @brief Inspect the scan response buffer for pointers to expected TLVs
883 *
884 * TLVs can be included at the end of the scan response BSS information.
885 * Parse the data in the buffer for pointers to TLVs that can potentially
886 * be passed back in the response
887 *
888 * @param ptlv Pointer to the start of the TLV buffer to parse
889 * @param tlvbufsize size of the TLV buffer
890 * @param ptsftlv Output parameter: Pointer to the TSF TLV if found
891 *
892 * @return void
893 */
894 static
895 void wlan_ret_802_11_scan_get_tlv_ptrs(struct mrvlietypes_data * ptlv,
896 int tlvbufsize,
897 struct mrvlietypes_tsftimestamp ** ptsftlv)
898 {
899 struct mrvlietypes_data *pcurrenttlv;
900 int tlvbufleft;
901 u16 tlvtype;
902 u16 tlvlen;
903
904 pcurrenttlv = ptlv;
905 tlvbufleft = tlvbufsize;
906 *ptsftlv = NULL;
907
908 lbs_deb_scan("SCAN_RESP: tlvbufsize = %d\n", tlvbufsize);
909 lbs_dbg_hex("SCAN_RESP: TLV Buf", (u8 *) ptlv, tlvbufsize);
910
911 while (tlvbufleft >= sizeof(struct mrvlietypesheader)) {
912 tlvtype = le16_to_cpu(pcurrenttlv->header.type);
913 tlvlen = le16_to_cpu(pcurrenttlv->header.len);
914
915 switch (tlvtype) {
916 case TLV_TYPE_TSFTIMESTAMP:
917 *ptsftlv = (struct mrvlietypes_tsftimestamp *) pcurrenttlv;
918 break;
919
920 default:
921 lbs_deb_scan("SCAN_RESP: Unhandled TLV = %d\n",
922 tlvtype);
923 /* Give up, this seems corrupted */
924 return;
925 } /* switch */
926
927 tlvbufleft -= (sizeof(ptlv->header) + tlvlen);
928 pcurrenttlv =
929 (struct mrvlietypes_data *) (pcurrenttlv->Data + tlvlen);
930 } /* while */
931 }
932
933 /**
934 * @brief Interpret a BSS scan response returned from the firmware
935 *
936 * Parse the various fixed fields and IEs passed back for a a BSS probe
937 * response or beacon from the scan command. Record information as needed
938 * in the scan table struct bss_descriptor for that entry.
939 *
940 * @param bss Output parameter: Pointer to the BSS Entry
941 *
942 * @return 0 or -1
943 */
944 static int libertas_process_bss(struct bss_descriptor * bss,
945 u8 ** pbeaconinfo, int *bytesleft)
946 {
947 enum ieeetypes_elementid elemID;
948 struct ieeetypes_fhparamset *pFH;
949 struct ieeetypes_dsparamset *pDS;
950 struct ieeetypes_cfparamset *pCF;
951 struct ieeetypes_ibssparamset *pibss;
952 struct ieeetypes_capinfo *pcap;
953 struct WLAN_802_11_FIXED_IEs fixedie;
954 u8 *pcurrentptr;
955 u8 *pRate;
956 u8 elemlen;
957 u8 bytestocopy;
958 u8 ratesize;
959 u16 beaconsize;
960 u8 founddatarateie;
961 int bytesleftforcurrentbeacon;
962 int ret;
963
964 struct IE_WPA *pIe;
965 const u8 oui01[4] = { 0x00, 0x50, 0xf2, 0x01 };
966
967 struct ieeetypes_countryinfoset *pcountryinfo;
968
969 lbs_deb_enter(LBS_DEB_ASSOC);
970
971 founddatarateie = 0;
972 ratesize = 0;
973 beaconsize = 0;
974
975 if (*bytesleft >= sizeof(beaconsize)) {
976 /* Extract & convert beacon size from the command buffer */
977 memcpy(&beaconsize, *pbeaconinfo, sizeof(beaconsize));
978 beaconsize = le16_to_cpu(beaconsize);
979 *bytesleft -= sizeof(beaconsize);
980 *pbeaconinfo += sizeof(beaconsize);
981 }
982
983 if (beaconsize == 0 || beaconsize > *bytesleft) {
984
985 *pbeaconinfo += *bytesleft;
986 *bytesleft = 0;
987
988 return -1;
989 }
990
991 /* Initialize the current working beacon pointer for this BSS iteration */
992 pcurrentptr = *pbeaconinfo;
993
994 /* Advance the return beacon pointer past the current beacon */
995 *pbeaconinfo += beaconsize;
996 *bytesleft -= beaconsize;
997
998 bytesleftforcurrentbeacon = beaconsize;
999
1000 memcpy(bss->bssid, pcurrentptr, ETH_ALEN);
1001 lbs_deb_scan("process_bss: AP BSSID " MAC_FMT "\n",
1002 bss->bssid[0], bss->bssid[1], bss->bssid[2],
1003 bss->bssid[3], bss->bssid[4], bss->bssid[5]);
1004
1005 pcurrentptr += ETH_ALEN;
1006 bytesleftforcurrentbeacon -= ETH_ALEN;
1007
1008 if (bytesleftforcurrentbeacon < 12) {
1009 lbs_deb_scan("process_bss: Not enough bytes left\n");
1010 return -1;
1011 }
1012
1013 /*
1014 * next 4 fields are RSSI, time stamp, beacon interval,
1015 * and capability information
1016 */
1017
1018 /* RSSI is 1 byte long */
1019 bss->rssi = le32_to_cpu((long)(*pcurrentptr));
1020 lbs_deb_scan("process_bss: RSSI=%02X\n", *pcurrentptr);
1021 pcurrentptr += 1;
1022 bytesleftforcurrentbeacon -= 1;
1023
1024 /* time stamp is 8 bytes long */
1025 memcpy(fixedie.timestamp, pcurrentptr, 8);
1026 memcpy(bss->timestamp, pcurrentptr, 8);
1027 pcurrentptr += 8;
1028 bytesleftforcurrentbeacon -= 8;
1029
1030 /* beacon interval is 2 bytes long */
1031 memcpy(&fixedie.beaconinterval, pcurrentptr, 2);
1032 bss->beaconperiod = le16_to_cpu(fixedie.beaconinterval);
1033 pcurrentptr += 2;
1034 bytesleftforcurrentbeacon -= 2;
1035
1036 /* capability information is 2 bytes long */
1037 memcpy(&fixedie.capabilities, pcurrentptr, 2);
1038 lbs_deb_scan("process_bss: fixedie.capabilities=0x%X\n",
1039 fixedie.capabilities);
1040 fixedie.capabilities = le16_to_cpu(fixedie.capabilities);
1041 pcap = (struct ieeetypes_capinfo *) & fixedie.capabilities;
1042 memcpy(&bss->cap, pcap, sizeof(struct ieeetypes_capinfo));
1043 pcurrentptr += 2;
1044 bytesleftforcurrentbeacon -= 2;
1045
1046 /* rest of the current buffer are IE's */
1047 lbs_deb_scan("process_bss: IE length for this AP = %d\n",
1048 bytesleftforcurrentbeacon);
1049
1050 lbs_dbg_hex("process_bss: IE info", (u8 *) pcurrentptr,
1051 bytesleftforcurrentbeacon);
1052
1053 if (pcap->privacy) {
1054 lbs_deb_scan("process_bss: AP WEP enabled\n");
1055 bss->privacy = wlan802_11privfilter8021xWEP;
1056 } else {
1057 bss->privacy = wlan802_11privfilteracceptall;
1058 }
1059
1060 if (pcap->ibss == 1) {
1061 bss->mode = IW_MODE_ADHOC;
1062 } else {
1063 bss->mode = IW_MODE_INFRA;
1064 }
1065
1066 /* process variable IE */
1067 while (bytesleftforcurrentbeacon >= 2) {
1068 elemID = (enum ieeetypes_elementid) (*((u8 *) pcurrentptr));
1069 elemlen = *((u8 *) pcurrentptr + 1);
1070
1071 if (bytesleftforcurrentbeacon < elemlen) {
1072 lbs_deb_scan("process_bss: error in processing IE, "
1073 "bytes left < IE length\n");
1074 bytesleftforcurrentbeacon = 0;
1075 continue;
1076 }
1077
1078 switch (elemID) {
1079 case SSID:
1080 bss->ssid.ssidlength = elemlen;
1081 memcpy(bss->ssid.ssid, (pcurrentptr + 2), elemlen);
1082 lbs_deb_scan("ssid '%s'\n", bss->ssid.ssid);
1083 break;
1084
1085 case SUPPORTED_RATES:
1086 memcpy(bss->datarates, (pcurrentptr + 2), elemlen);
1087 memmove(bss->libertas_supported_rates, (pcurrentptr + 2),
1088 elemlen);
1089 ratesize = elemlen;
1090 founddatarateie = 1;
1091 break;
1092
1093 case EXTRA_IE:
1094 lbs_deb_scan("process_bss: EXTRA_IE Found!\n");
1095 break;
1096
1097 case FH_PARAM_SET:
1098 pFH = (struct ieeetypes_fhparamset *) pcurrentptr;
1099 memmove(&bss->phyparamset.fhparamset, pFH,
1100 sizeof(struct ieeetypes_fhparamset));
1101 bss->phyparamset.fhparamset.dwelltime
1102 = le16_to_cpu(bss->phyparamset.fhparamset.dwelltime);
1103 break;
1104
1105 case DS_PARAM_SET:
1106 pDS = (struct ieeetypes_dsparamset *) pcurrentptr;
1107 bss->channel = pDS->currentchan;
1108 memcpy(&bss->phyparamset.dsparamset, pDS,
1109 sizeof(struct ieeetypes_dsparamset));
1110 break;
1111
1112 case CF_PARAM_SET:
1113 pCF = (struct ieeetypes_cfparamset *) pcurrentptr;
1114 memcpy(&bss->ssparamset.cfparamset, pCF,
1115 sizeof(struct ieeetypes_cfparamset));
1116 break;
1117
1118 case IBSS_PARAM_SET:
1119 pibss = (struct ieeetypes_ibssparamset *) pcurrentptr;
1120 bss->atimwindow = le32_to_cpu(pibss->atimwindow);
1121 memmove(&bss->ssparamset.ibssparamset, pibss,
1122 sizeof(struct ieeetypes_ibssparamset));
1123 bss->ssparamset.ibssparamset.atimwindow
1124 = le16_to_cpu(bss->ssparamset.ibssparamset.atimwindow);
1125 break;
1126
1127 /* Handle Country Info IE */
1128 case COUNTRY_INFO:
1129 pcountryinfo = (struct ieeetypes_countryinfoset *) pcurrentptr;
1130 if (pcountryinfo->len < sizeof(pcountryinfo->countrycode)
1131 || pcountryinfo->len > 254) {
1132 lbs_deb_scan("process_bss: 11D- Err "
1133 "CountryInfo len =%d min=%zd max=254\n",
1134 pcountryinfo->len,
1135 sizeof(pcountryinfo->countrycode));
1136 ret = -1;
1137 goto done;
1138 }
1139
1140 memcpy(&bss->countryinfo,
1141 pcountryinfo, pcountryinfo->len + 2);
1142 lbs_dbg_hex("process_bss: 11D- CountryInfo:",
1143 (u8 *) pcountryinfo,
1144 (u32) (pcountryinfo->len + 2));
1145 break;
1146
1147 case EXTENDED_SUPPORTED_RATES:
1148 /*
1149 * only process extended supported rate
1150 * if data rate is already found.
1151 * data rate IE should come before
1152 * extended supported rate IE
1153 */
1154 if (founddatarateie) {
1155 if ((elemlen + ratesize) > WLAN_SUPPORTED_RATES) {
1156 bytestocopy =
1157 (WLAN_SUPPORTED_RATES - ratesize);
1158 } else {
1159 bytestocopy = elemlen;
1160 }
1161
1162 pRate = (u8 *) bss->datarates;
1163 pRate += ratesize;
1164 memmove(pRate, (pcurrentptr + 2), bytestocopy);
1165 pRate = (u8 *) bss->libertas_supported_rates;
1166 pRate += ratesize;
1167 memmove(pRate, (pcurrentptr + 2), bytestocopy);
1168 }
1169 break;
1170
1171 case VENDOR_SPECIFIC_221:
1172 #define IE_ID_LEN_FIELDS_BYTES 2
1173 pIe = (struct IE_WPA *)pcurrentptr;
1174
1175 if (memcmp(pIe->oui, oui01, sizeof(oui01)))
1176 break;
1177
1178 bss->wpa_ie_len = min(elemlen + IE_ID_LEN_FIELDS_BYTES,
1179 MAX_WPA_IE_LEN);
1180 memcpy(bss->wpa_ie, pcurrentptr, bss->wpa_ie_len);
1181 lbs_dbg_hex("process_bss: WPA IE", bss->wpa_ie, elemlen);
1182 break;
1183 case WPA2_IE:
1184 pIe = (struct IE_WPA *)pcurrentptr;
1185 bss->rsn_ie_len = min(elemlen + IE_ID_LEN_FIELDS_BYTES,
1186 MAX_WPA_IE_LEN);
1187 memcpy(bss->rsn_ie, pcurrentptr, bss->rsn_ie_len);
1188 lbs_dbg_hex("process_bss: RSN_IE", bss->rsn_ie, elemlen);
1189 break;
1190 case TIM:
1191 break;
1192
1193 case CHALLENGE_TEXT:
1194 break;
1195 }
1196
1197 pcurrentptr += elemlen + 2;
1198
1199 /* need to account for IE ID and IE len */
1200 bytesleftforcurrentbeacon -= (elemlen + 2);
1201
1202 } /* while (bytesleftforcurrentbeacon > 2) */
1203
1204 /* Timestamp */
1205 bss->last_scanned = jiffies;
1206
1207 ret = 0;
1208
1209 done:
1210 lbs_deb_leave_args(LBS_DEB_SCAN, "ret %d", ret);
1211 return ret;
1212 }
1213
1214 /**
1215 * @brief Compare two SSIDs
1216 *
1217 * @param ssid1 A pointer to ssid to compare
1218 * @param ssid2 A pointer to ssid to compare
1219 *
1220 * @return 0--ssid is same, otherwise is different
1221 */
1222 int libertas_SSID_cmp(struct WLAN_802_11_SSID *ssid1, struct WLAN_802_11_SSID *ssid2)
1223 {
1224 if (!ssid1 || !ssid2)
1225 return -1;
1226
1227 if (ssid1->ssidlength != ssid2->ssidlength)
1228 return -1;
1229
1230 return memcmp(ssid1->ssid, ssid2->ssid, ssid1->ssidlength);
1231 }
1232
1233 /**
1234 * @brief This function finds a specific compatible BSSID in the scan list
1235 *
1236 * @param adapter A pointer to wlan_adapter
1237 * @param bssid BSSID to find in the scan list
1238 * @param mode Network mode: Infrastructure or IBSS
1239 *
1240 * @return index in BSSID list, or error return code (< 0)
1241 */
1242 struct bss_descriptor * libertas_find_BSSID_in_list(wlan_adapter * adapter,
1243 u8 * bssid, u8 mode)
1244 {
1245 struct bss_descriptor * iter_bss;
1246 struct bss_descriptor * found_bss = NULL;
1247
1248 if (!bssid)
1249 return NULL;
1250
1251 lbs_dbg_hex("libertas_find_BSSID_in_list: looking for ",
1252 bssid, ETH_ALEN);
1253
1254 /* Look through the scan table for a compatible match. The loop will
1255 * continue past a matched bssid that is not compatible in case there
1256 * is an AP with multiple SSIDs assigned to the same BSSID
1257 */
1258 mutex_lock(&adapter->lock);
1259 list_for_each_entry (iter_bss, &adapter->network_list, list) {
1260 if (memcmp(iter_bss->bssid, bssid, ETH_ALEN))
1261 continue; /* bssid doesn't match */
1262 switch (mode) {
1263 case IW_MODE_INFRA:
1264 case IW_MODE_ADHOC:
1265 if (!is_network_compatible(adapter, iter_bss, mode))
1266 break;
1267 found_bss = iter_bss;
1268 break;
1269 default:
1270 found_bss = iter_bss;
1271 break;
1272 }
1273 }
1274 mutex_unlock(&adapter->lock);
1275
1276 return found_bss;
1277 }
1278
1279 /**
1280 * @brief This function finds ssid in ssid list.
1281 *
1282 * @param adapter A pointer to wlan_adapter
1283 * @param ssid SSID to find in the list
1284 * @param bssid BSSID to qualify the SSID selection (if provided)
1285 * @param mode Network mode: Infrastructure or IBSS
1286 *
1287 * @return index in BSSID list
1288 */
1289 struct bss_descriptor * libertas_find_SSID_in_list(wlan_adapter * adapter,
1290 struct WLAN_802_11_SSID *ssid, u8 * bssid, u8 mode)
1291 {
1292 u8 bestrssi = 0;
1293 struct bss_descriptor * iter_bss = NULL;
1294 struct bss_descriptor * found_bss = NULL;
1295 struct bss_descriptor * tmp_oldest = NULL;
1296
1297 mutex_lock(&adapter->lock);
1298
1299 list_for_each_entry (iter_bss, &adapter->network_list, list) {
1300 if ( !tmp_oldest
1301 || (iter_bss->last_scanned < tmp_oldest->last_scanned))
1302 tmp_oldest = iter_bss;
1303
1304 if (libertas_SSID_cmp(&iter_bss->ssid, ssid) != 0)
1305 continue; /* ssid doesn't match */
1306 if (bssid && memcmp(iter_bss->bssid, bssid, ETH_ALEN) != 0)
1307 continue; /* bssid doesn't match */
1308
1309 switch (mode) {
1310 case IW_MODE_INFRA:
1311 case IW_MODE_ADHOC:
1312 if (!is_network_compatible(adapter, iter_bss, mode))
1313 break;
1314
1315 if (bssid) {
1316 /* Found requested BSSID */
1317 found_bss = iter_bss;
1318 goto out;
1319 }
1320
1321 if (SCAN_RSSI(iter_bss->rssi) > bestrssi) {
1322 bestrssi = SCAN_RSSI(iter_bss->rssi);
1323 found_bss = iter_bss;
1324 }
1325 break;
1326 case IW_MODE_AUTO:
1327 default:
1328 if (SCAN_RSSI(iter_bss->rssi) > bestrssi) {
1329 bestrssi = SCAN_RSSI(iter_bss->rssi);
1330 found_bss = iter_bss;
1331 }
1332 break;
1333 }
1334 }
1335
1336 out:
1337 mutex_unlock(&adapter->lock);
1338 return found_bss;
1339 }
1340
1341 /**
1342 * @brief This function finds the best SSID in the Scan List
1343 *
1344 * Search the scan table for the best SSID that also matches the current
1345 * adapter network preference (infrastructure or adhoc)
1346 *
1347 * @param adapter A pointer to wlan_adapter
1348 *
1349 * @return index in BSSID list
1350 */
1351 struct bss_descriptor * libertas_find_best_SSID_in_list(wlan_adapter * adapter,
1352 u8 mode)
1353 {
1354 u8 bestrssi = 0;
1355 struct bss_descriptor * iter_bss;
1356 struct bss_descriptor * best_bss = NULL;
1357
1358 mutex_lock(&adapter->lock);
1359
1360 list_for_each_entry (iter_bss, &adapter->network_list, list) {
1361 switch (mode) {
1362 case IW_MODE_INFRA:
1363 case IW_MODE_ADHOC:
1364 if (!is_network_compatible(adapter, iter_bss, mode))
1365 break;
1366 if (SCAN_RSSI(iter_bss->rssi) <= bestrssi)
1367 break;
1368 bestrssi = SCAN_RSSI(iter_bss->rssi);
1369 best_bss = iter_bss;
1370 break;
1371 case IW_MODE_AUTO:
1372 default:
1373 if (SCAN_RSSI(iter_bss->rssi) <= bestrssi)
1374 break;
1375 bestrssi = SCAN_RSSI(iter_bss->rssi);
1376 best_bss = iter_bss;
1377 break;
1378 }
1379 }
1380
1381 mutex_unlock(&adapter->lock);
1382 return best_bss;
1383 }
1384
1385 /**
1386 * @brief Find the AP with specific ssid in the scan list
1387 *
1388 * @param priv A pointer to wlan_private structure
1389 * @param pSSID A pointer to AP's ssid
1390 *
1391 * @return 0--success, otherwise--fail
1392 */
1393 int libertas_find_best_network_SSID(wlan_private * priv,
1394 struct WLAN_802_11_SSID *ssid,
1395 u8 preferred_mode, u8 *out_mode)
1396 {
1397 wlan_adapter *adapter = priv->adapter;
1398 int ret = -1;
1399 struct bss_descriptor * found;
1400
1401 lbs_deb_enter(LBS_DEB_ASSOC);
1402
1403 memset(ssid, 0, sizeof(struct WLAN_802_11_SSID));
1404
1405 wlan_scan_networks(priv, NULL, 1);
1406 if (adapter->surpriseremoved)
1407 return -1;
1408
1409 wait_event_interruptible(adapter->cmd_pending, !adapter->nr_cmd_pending);
1410
1411 found = libertas_find_best_SSID_in_list(adapter, preferred_mode);
1412 if (found && (found->ssid.ssidlength > 0)) {
1413 memcpy(ssid, &found->ssid, sizeof(struct WLAN_802_11_SSID));
1414 *out_mode = found->mode;
1415 ret = 0;
1416 }
1417
1418 lbs_deb_leave_args(LBS_DEB_SCAN, "ret %d", ret);
1419 return ret;
1420 }
1421
1422 /**
1423 * @brief Scan Network
1424 *
1425 * @param dev A pointer to net_device structure
1426 * @param info A pointer to iw_request_info structure
1427 * @param vwrq A pointer to iw_param structure
1428 * @param extra A pointer to extra data buf
1429 *
1430 * @return 0 --success, otherwise fail
1431 */
1432 int libertas_set_scan(struct net_device *dev, struct iw_request_info *info,
1433 struct iw_param *vwrq, char *extra)
1434 {
1435 wlan_private *priv = dev->priv;
1436 wlan_adapter *adapter = priv->adapter;
1437
1438 lbs_deb_enter(LBS_DEB_SCAN);
1439
1440 wlan_scan_networks(priv, NULL, 0);
1441
1442 if (adapter->surpriseremoved)
1443 return -1;
1444
1445 lbs_deb_leave(LBS_DEB_SCAN);
1446 return 0;
1447 }
1448
1449 /**
1450 * @brief Send a scan command for all available channels filtered on a spec
1451 *
1452 * @param priv A pointer to wlan_private structure
1453 * @param prequestedssid A pointer to AP's ssid
1454 * @param keeppreviousscan Flag used to save/clear scan table before scan
1455 *
1456 * @return 0-success, otherwise fail
1457 */
1458 int libertas_send_specific_SSID_scan(wlan_private * priv,
1459 struct WLAN_802_11_SSID *prequestedssid,
1460 u8 clear_ssid)
1461 {
1462 wlan_adapter *adapter = priv->adapter;
1463 struct wlan_ioctl_user_scan_cfg scancfg;
1464 int ret = 0;
1465
1466 lbs_deb_enter(LBS_DEB_ASSOC);
1467
1468 if (prequestedssid == NULL)
1469 goto out;
1470
1471 memset(&scancfg, 0x00, sizeof(scancfg));
1472 memcpy(scancfg.ssid, prequestedssid->ssid, prequestedssid->ssidlength);
1473 scancfg.ssid_len = prequestedssid->ssidlength;
1474 scancfg.clear_ssid = clear_ssid;
1475
1476 wlan_scan_networks(priv, &scancfg, 1);
1477 if (adapter->surpriseremoved)
1478 return -1;
1479 wait_event_interruptible(adapter->cmd_pending, !adapter->nr_cmd_pending);
1480
1481 out:
1482 lbs_deb_leave(LBS_DEB_ASSOC);
1483 return ret;
1484 }
1485
1486 /**
1487 * @brief scan an AP with specific BSSID
1488 *
1489 * @param priv A pointer to wlan_private structure
1490 * @param bssid A pointer to AP's bssid
1491 * @param keeppreviousscan Flag used to save/clear scan table before scan
1492 *
1493 * @return 0-success, otherwise fail
1494 */
1495 int libertas_send_specific_BSSID_scan(wlan_private * priv, u8 * bssid, u8 clear_bssid)
1496 {
1497 struct wlan_ioctl_user_scan_cfg scancfg;
1498
1499 lbs_deb_enter(LBS_DEB_ASSOC);
1500
1501 if (bssid == NULL)
1502 goto out;
1503
1504 memset(&scancfg, 0x00, sizeof(scancfg));
1505 memcpy(scancfg.bssid, bssid, ETH_ALEN);
1506 scancfg.clear_bssid = clear_bssid;
1507
1508 wlan_scan_networks(priv, &scancfg, 1);
1509 if (priv->adapter->surpriseremoved)
1510 return -1;
1511 wait_event_interruptible(priv->adapter->cmd_pending,
1512 !priv->adapter->nr_cmd_pending);
1513
1514 out:
1515 lbs_deb_leave(LBS_DEB_ASSOC);
1516 return 0;
1517 }
1518
1519 static inline char *libertas_translate_scan(wlan_private *priv,
1520 char *start, char *stop,
1521 struct bss_descriptor *bss)
1522 {
1523 wlan_adapter *adapter = priv->adapter;
1524 struct chan_freq_power *cfp;
1525 char *current_val; /* For rates */
1526 struct iw_event iwe; /* Temporary buffer */
1527 int j;
1528 int ret;
1529 #define PERFECT_RSSI ((u8)50)
1530 #define WORST_RSSI ((u8)0)
1531 #define RSSI_DIFF ((u8)(PERFECT_RSSI - WORST_RSSI))
1532 u8 rssi;
1533
1534 cfp = libertas_find_cfp_by_band_and_channel(adapter, 0, bss->channel);
1535 if (!cfp) {
1536 lbs_deb_scan("Invalid channel number %d\n", bss->channel);
1537 return NULL;
1538 }
1539
1540 /* First entry *MUST* be the AP BSSID */
1541 iwe.cmd = SIOCGIWAP;
1542 iwe.u.ap_addr.sa_family = ARPHRD_ETHER;
1543 memcpy(iwe.u.ap_addr.sa_data, &bss->bssid, ETH_ALEN);
1544 start = iwe_stream_add_event(start, stop, &iwe, IW_EV_ADDR_LEN);
1545
1546 /* SSID */
1547 iwe.cmd = SIOCGIWESSID;
1548 iwe.u.data.flags = 1;
1549 iwe.u.data.length = min(bss->ssid.ssidlength, (u32) IW_ESSID_MAX_SIZE);
1550 start = iwe_stream_add_point(start, stop, &iwe, bss->ssid.ssid);
1551
1552 /* Mode */
1553 iwe.cmd = SIOCGIWMODE;
1554 iwe.u.mode = bss->mode;
1555 start = iwe_stream_add_event(start, stop, &iwe, IW_EV_UINT_LEN);
1556
1557 /* Frequency */
1558 iwe.cmd = SIOCGIWFREQ;
1559 iwe.u.freq.m = (long)cfp->freq * 100000;
1560 iwe.u.freq.e = 1;
1561 start = iwe_stream_add_event(start, stop, &iwe, IW_EV_FREQ_LEN);
1562
1563 /* Add quality statistics */
1564 iwe.cmd = IWEVQUAL;
1565 iwe.u.qual.updated = IW_QUAL_ALL_UPDATED;
1566 iwe.u.qual.level = SCAN_RSSI(bss->rssi);
1567
1568 rssi = iwe.u.qual.level - MRVDRV_NF_DEFAULT_SCAN_VALUE;
1569 iwe.u.qual.qual =
1570 (100 * RSSI_DIFF * RSSI_DIFF - (PERFECT_RSSI - rssi) *
1571 (15 * (RSSI_DIFF) + 62 * (PERFECT_RSSI - rssi))) /
1572 (RSSI_DIFF * RSSI_DIFF);
1573 if (iwe.u.qual.qual > 100)
1574 iwe.u.qual.qual = 100;
1575
1576 if (adapter->NF[TYPE_BEACON][TYPE_NOAVG] == 0) {
1577 iwe.u.qual.noise = MRVDRV_NF_DEFAULT_SCAN_VALUE;
1578 } else {
1579 iwe.u.qual.noise =
1580 CAL_NF(adapter->NF[TYPE_BEACON][TYPE_NOAVG]);
1581 }
1582 if ((adapter->mode == IW_MODE_AUTO) &&
1583 !libertas_SSID_cmp(&adapter->curbssparams.ssid, &bss->ssid)
1584 && adapter->adhoccreate) {
1585 ret = libertas_prepare_and_send_command(priv,
1586 cmd_802_11_rssi,
1587 0,
1588 cmd_option_waitforrsp,
1589 0, NULL);
1590
1591 if (!ret) {
1592 iwe.u.qual.level =
1593 CAL_RSSI(adapter->SNR[TYPE_RXPD][TYPE_AVG] /
1594 AVG_SCALE,
1595 adapter->NF[TYPE_RXPD][TYPE_AVG] /
1596 AVG_SCALE);
1597 }
1598 }
1599 start = iwe_stream_add_event(start, stop, &iwe, IW_EV_QUAL_LEN);
1600
1601 /* Add encryption capability */
1602 iwe.cmd = SIOCGIWENCODE;
1603 if (bss->privacy) {
1604 iwe.u.data.flags = IW_ENCODE_ENABLED | IW_ENCODE_NOKEY;
1605 } else {
1606 iwe.u.data.flags = IW_ENCODE_DISABLED;
1607 }
1608 iwe.u.data.length = 0;
1609 start = iwe_stream_add_point(start, stop, &iwe, bss->ssid.ssid);
1610
1611 current_val = start + IW_EV_LCP_LEN;
1612
1613 iwe.cmd = SIOCGIWRATE;
1614 iwe.u.bitrate.fixed = 0;
1615 iwe.u.bitrate.disabled = 0;
1616 iwe.u.bitrate.value = 0;
1617
1618 for (j = 0; j < sizeof(bss->libertas_supported_rates); j++) {
1619 u8 rate = bss->libertas_supported_rates[j];
1620 if (rate == 0)
1621 break; /* no more rates */
1622 /* Bit rate given in 500 kb/s units (+ 0x80) */
1623 iwe.u.bitrate.value = (rate & 0x7f) * 500000;
1624 current_val = iwe_stream_add_value(start, current_val,
1625 stop, &iwe, IW_EV_PARAM_LEN);
1626 }
1627 if ((bss->mode == IW_MODE_ADHOC)
1628 && !libertas_SSID_cmp(&adapter->curbssparams.ssid, &bss->ssid)
1629 && adapter->adhoccreate) {
1630 iwe.u.bitrate.value = 22 * 500000;
1631 current_val = iwe_stream_add_value(start, current_val,
1632 stop, &iwe, IW_EV_PARAM_LEN);
1633 }
1634 /* Check if we added any event */
1635 if((current_val - start) > IW_EV_LCP_LEN)
1636 start = current_val;
1637
1638 memset(&iwe, 0, sizeof(iwe));
1639 if (bss->wpa_ie_len) {
1640 char buf[MAX_WPA_IE_LEN];
1641 memcpy(buf, bss->wpa_ie, bss->wpa_ie_len);
1642 iwe.cmd = IWEVGENIE;
1643 iwe.u.data.length = bss->wpa_ie_len;
1644 start = iwe_stream_add_point(start, stop, &iwe, buf);
1645 }
1646
1647 memset(&iwe, 0, sizeof(iwe));
1648 if (bss->rsn_ie_len) {
1649 char buf[MAX_WPA_IE_LEN];
1650 memcpy(buf, bss->rsn_ie, bss->rsn_ie_len);
1651 iwe.cmd = IWEVGENIE;
1652 iwe.u.data.length = bss->rsn_ie_len;
1653 start = iwe_stream_add_point(start, stop, &iwe, buf);
1654 }
1655
1656 return start;
1657 }
1658
1659 /**
1660 * @brief Retrieve the scan table entries via wireless tools IOCTL call
1661 *
1662 * @param dev A pointer to net_device structure
1663 * @param info A pointer to iw_request_info structure
1664 * @param dwrq A pointer to iw_point structure
1665 * @param extra A pointer to extra data buf
1666 *
1667 * @return 0 --success, otherwise fail
1668 */
1669 int libertas_get_scan(struct net_device *dev, struct iw_request_info *info,
1670 struct iw_point *dwrq, char *extra)
1671 {
1672 #define SCAN_ITEM_SIZE 128
1673 wlan_private *priv = dev->priv;
1674 wlan_adapter *adapter = priv->adapter;
1675 int err = 0;
1676 char *ev = extra;
1677 char *stop = ev + dwrq->length;
1678 struct bss_descriptor * iter_bss;
1679 struct bss_descriptor * safe;
1680
1681 lbs_deb_enter(LBS_DEB_ASSOC);
1682
1683 /* If we've got an uncompleted scan, schedule the next part */
1684 if (!adapter->nr_cmd_pending && adapter->last_scanned_channel)
1685 wlan_scan_networks(priv, NULL, 0);
1686
1687 mutex_lock(&adapter->lock);
1688 list_for_each_entry_safe (iter_bss, safe, &adapter->network_list, list) {
1689 char * next_ev;
1690 unsigned long stale_time;
1691
1692 if (stop - ev < SCAN_ITEM_SIZE) {
1693 err = -E2BIG;
1694 break;
1695 }
1696
1697 /* Prune old an old scan result */
1698 stale_time = iter_bss->last_scanned + DEFAULT_MAX_SCAN_AGE;
1699 if (time_after(jiffies, stale_time)) {
1700 list_move_tail (&iter_bss->list,
1701 &adapter->network_free_list);
1702 clear_bss_descriptor(iter_bss);
1703 continue;
1704 }
1705
1706 /* Translate to WE format this entry */
1707 next_ev = libertas_translate_scan(priv, ev, stop, iter_bss);
1708 if (next_ev == NULL)
1709 continue;
1710 ev = next_ev;
1711 }
1712 mutex_unlock(&adapter->lock);
1713
1714 dwrq->length = (ev - extra);
1715 dwrq->flags = 0;
1716
1717 lbs_deb_leave(LBS_DEB_ASSOC);
1718 return err;
1719 }
1720
1721 /**
1722 * @brief Prepare a scan command to be sent to the firmware
1723 *
1724 * Use the wlan_scan_cmd_config sent to the command processing module in
1725 * the libertas_prepare_and_send_command to configure a cmd_ds_802_11_scan command
1726 * struct to send to firmware.
1727 *
1728 * The fixed fields specifying the BSS type and BSSID filters as well as a
1729 * variable number/length of TLVs are sent in the command to firmware.
1730 *
1731 * @param priv A pointer to wlan_private structure
1732 * @param cmd A pointer to cmd_ds_command structure to be sent to
1733 * firmware with the cmd_DS_801_11_SCAN structure
1734 * @param pdata_buf Void pointer cast of a wlan_scan_cmd_config struct used
1735 * to set the fields/TLVs for the command sent to firmware
1736 *
1737 * @return 0 or -1
1738 *
1739 * @sa wlan_scan_create_channel_list
1740 */
1741 int libertas_cmd_80211_scan(wlan_private * priv,
1742 struct cmd_ds_command *cmd, void *pdata_buf)
1743 {
1744 struct cmd_ds_802_11_scan *pscan = &cmd->params.scan;
1745 struct wlan_scan_cmd_config *pscancfg;
1746
1747 lbs_deb_enter(LBS_DEB_ASSOC);
1748
1749 pscancfg = pdata_buf;
1750
1751 /* Set fixed field variables in scan command */
1752 pscan->bsstype = pscancfg->bsstype;
1753 memcpy(pscan->BSSID, pscancfg->bssid, sizeof(pscan->BSSID));
1754 memcpy(pscan->tlvbuffer, pscancfg->tlvbuffer, pscancfg->tlvbufferlen);
1755
1756 cmd->command = cpu_to_le16(cmd_802_11_scan);
1757
1758 /* size is equal to the sizeof(fixed portions) + the TLV len + header */
1759 cmd->size = cpu_to_le16(sizeof(pscan->bsstype)
1760 + sizeof(pscan->BSSID)
1761 + pscancfg->tlvbufferlen + S_DS_GEN);
1762
1763 lbs_deb_scan("SCAN_CMD: command=%x, size=%x, seqnum=%x\n",
1764 cmd->command, cmd->size, cmd->seqnum);
1765
1766 lbs_deb_leave(LBS_DEB_ASSOC);
1767 return 0;
1768 }
1769
1770 static inline int is_same_network(struct bss_descriptor *src,
1771 struct bss_descriptor *dst)
1772 {
1773 /* A network is only a duplicate if the channel, BSSID, and ESSID
1774 * all match. We treat all <hidden> with the same BSSID and channel
1775 * as one network */
1776 return ((src->ssid.ssidlength == dst->ssid.ssidlength) &&
1777 (src->channel == dst->channel) &&
1778 !compare_ether_addr(src->bssid, dst->bssid) &&
1779 !memcmp(src->ssid.ssid, dst->ssid.ssid, src->ssid.ssidlength));
1780 }
1781
1782 /**
1783 * @brief This function handles the command response of scan
1784 *
1785 * The response buffer for the scan command has the following
1786 * memory layout:
1787 *
1788 * .-----------------------------------------------------------.
1789 * | header (4 * sizeof(u16)): Standard command response hdr |
1790 * .-----------------------------------------------------------.
1791 * | bufsize (u16) : sizeof the BSS Description data |
1792 * .-----------------------------------------------------------.
1793 * | NumOfSet (u8) : Number of BSS Descs returned |
1794 * .-----------------------------------------------------------.
1795 * | BSSDescription data (variable, size given in bufsize) |
1796 * .-----------------------------------------------------------.
1797 * | TLV data (variable, size calculated using header->size, |
1798 * | bufsize and sizeof the fixed fields above) |
1799 * .-----------------------------------------------------------.
1800 *
1801 * @param priv A pointer to wlan_private structure
1802 * @param resp A pointer to cmd_ds_command
1803 *
1804 * @return 0 or -1
1805 */
1806 int libertas_ret_80211_scan(wlan_private * priv, struct cmd_ds_command *resp)
1807 {
1808 wlan_adapter *adapter = priv->adapter;
1809 struct cmd_ds_802_11_scan_rsp *pscan;
1810 struct mrvlietypes_data *ptlv;
1811 struct mrvlietypes_tsftimestamp *ptsftlv;
1812 struct bss_descriptor * iter_bss;
1813 struct bss_descriptor * safe;
1814 u8 *pbssinfo;
1815 u16 scanrespsize;
1816 int bytesleft;
1817 int idx;
1818 int tlvbufsize;
1819 u64 tsfval;
1820 int ret;
1821
1822 lbs_deb_enter(LBS_DEB_ASSOC);
1823
1824 /* Prune old entries from scan table */
1825 list_for_each_entry_safe (iter_bss, safe, &adapter->network_list, list) {
1826 unsigned long stale_time = iter_bss->last_scanned + DEFAULT_MAX_SCAN_AGE;
1827 if (time_before(jiffies, stale_time))
1828 continue;
1829 list_move_tail (&iter_bss->list, &adapter->network_free_list);
1830 clear_bss_descriptor(iter_bss);
1831 }
1832
1833 pscan = &resp->params.scanresp;
1834
1835 if (pscan->nr_sets > MAX_NETWORK_COUNT) {
1836 lbs_deb_scan(
1837 "SCAN_RESP: too many scan results (%d, max %d)!!\n",
1838 pscan->nr_sets, MAX_NETWORK_COUNT);
1839 ret = -1;
1840 goto done;
1841 }
1842
1843 bytesleft = le16_to_cpu(pscan->bssdescriptsize);
1844 lbs_deb_scan("SCAN_RESP: bssdescriptsize %d\n", bytesleft);
1845
1846 scanrespsize = le16_to_cpu(resp->size);
1847 lbs_deb_scan("SCAN_RESP: returned %d AP before parsing\n",
1848 pscan->nr_sets);
1849
1850 pbssinfo = pscan->bssdesc_and_tlvbuffer;
1851
1852 /* The size of the TLV buffer is equal to the entire command response
1853 * size (scanrespsize) minus the fixed fields (sizeof()'s), the
1854 * BSS Descriptions (bssdescriptsize as bytesLef) and the command
1855 * response header (S_DS_GEN)
1856 */
1857 tlvbufsize = scanrespsize - (bytesleft + sizeof(pscan->bssdescriptsize)
1858 + sizeof(pscan->nr_sets)
1859 + S_DS_GEN);
1860
1861 ptlv = (struct mrvlietypes_data *) (pscan->bssdesc_and_tlvbuffer + bytesleft);
1862
1863 /* Search the TLV buffer space in the scan response for any valid TLVs */
1864 wlan_ret_802_11_scan_get_tlv_ptrs(ptlv, tlvbufsize, &ptsftlv);
1865
1866 /*
1867 * Process each scan response returned (pscan->nr_sets). Save
1868 * the information in the newbssentry and then insert into the
1869 * driver scan table either as an update to an existing entry
1870 * or as an addition at the end of the table
1871 */
1872 for (idx = 0; idx < pscan->nr_sets && bytesleft; idx++) {
1873 struct bss_descriptor new;
1874 struct bss_descriptor * found = NULL;
1875 struct bss_descriptor * iter_bss = NULL;
1876 struct bss_descriptor * oldest = NULL;
1877
1878 /* Process the data fields and IEs returned for this BSS */
1879 memset(&new, 0, sizeof (struct bss_descriptor));
1880 if (libertas_process_bss(&new, &pbssinfo, &bytesleft) != 0) {
1881 /* error parsing the scan response, skipped */
1882 lbs_deb_scan("SCAN_RESP: process_bss returned ERROR\n");
1883 continue;
1884 }
1885
1886 /* Try to find this bss in the scan table */
1887 list_for_each_entry (iter_bss, &adapter->network_list, list) {
1888 if (is_same_network(iter_bss, &new)) {
1889 found = iter_bss;
1890 break;
1891 }
1892
1893 if ((oldest == NULL) ||
1894 (iter_bss->last_scanned < oldest->last_scanned))
1895 oldest = iter_bss;
1896 }
1897
1898 if (found) {
1899 /* found, clear it */
1900 clear_bss_descriptor(found);
1901 } else if (!list_empty(&adapter->network_free_list)) {
1902 /* Pull one from the free list */
1903 found = list_entry(adapter->network_free_list.next,
1904 struct bss_descriptor, list);
1905 list_move_tail(&found->list, &adapter->network_list);
1906 } else if (oldest) {
1907 /* If there are no more slots, expire the oldest */
1908 found = oldest;
1909 clear_bss_descriptor(found);
1910 list_move_tail(&found->list, &adapter->network_list);
1911 } else {
1912 continue;
1913 }
1914
1915 lbs_deb_scan("SCAN_RESP: BSSID = " MAC_FMT "\n",
1916 new.bssid[0], new.bssid[1], new.bssid[2],
1917 new.bssid[3], new.bssid[4], new.bssid[5]);
1918
1919 /*
1920 * If the TSF TLV was appended to the scan results, save the
1921 * this entries TSF value in the networktsf field. The
1922 * networktsf is the firmware's TSF value at the time the
1923 * beacon or probe response was received.
1924 */
1925 if (ptsftlv) {
1926 memcpy(&tsfval, &ptsftlv->tsftable[idx], sizeof(tsfval));
1927 tsfval = le64_to_cpu(tsfval);
1928 memcpy(&new.networktsf, &tsfval, sizeof(new.networktsf));
1929 }
1930
1931 /* Copy the locally created newbssentry to the scan table */
1932 memcpy(found, &new, offsetof(struct bss_descriptor, list));
1933 }
1934
1935 ret = 0;
1936
1937 done:
1938 lbs_deb_leave_args(LBS_DEB_SCAN, "ret %d", ret);
1939 return ret;
1940 }
kernel source for telekom puls (alcatel/mediatek)