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[deliverable/linux.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 static const u8 zeromac[ETH_ALEN] = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
63 static 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 && (match_bss->wpa_ie[0] == WPA_IE)
103 /* privacy bit may NOT be set in some APs like LinkSys WRT54G
104 && bss->privacy */
105 ) {
106 return 1;
107 }
108 return 0;
109 }
110
111 static inline int match_bss_wpa2(struct wlan_802_11_security * secinfo,
112 struct bss_descriptor * match_bss)
113 {
114 if ( !secinfo->wep_enabled
115 && secinfo->WPA2enabled
116 && (match_bss->rsn_ie[0] == WPA2_IE)
117 /* privacy bit may NOT be set in some APs like LinkSys WRT54G
118 && bss->privacy */
119 ) {
120 return 1;
121 }
122 return 0;
123 }
124
125 static inline int match_bss_dynamic_wep(struct wlan_802_11_security * secinfo,
126 struct bss_descriptor * match_bss)
127 {
128 if ( !secinfo->wep_enabled
129 && !secinfo->WPAenabled
130 && !secinfo->WPA2enabled
131 && (match_bss->wpa_ie[0] != WPA_IE)
132 && (match_bss->rsn_ie[0] != WPA2_IE)
133 && match_bss->privacy) {
134 return 1;
135 }
136 return 0;
137 }
138
139 /**
140 * @brief Check if a scanned network compatible with the driver settings
141 *
142 * WEP WPA WPA2 ad-hoc encrypt Network
143 * enabled enabled enabled AES mode privacy WPA WPA2 Compatible
144 * 0 0 0 0 NONE 0 0 0 yes No security
145 * 1 0 0 0 NONE 1 0 0 yes Static WEP
146 * 0 1 0 0 x 1x 1 x yes WPA
147 * 0 0 1 0 x 1x x 1 yes WPA2
148 * 0 0 0 1 NONE 1 0 0 yes Ad-hoc AES
149 * 0 0 0 0 !=NONE 1 0 0 yes Dynamic WEP
150 *
151 *
152 * @param adapter A pointer to wlan_adapter
153 * @param index Index in scantable to check against current driver settings
154 * @param mode Network mode: Infrastructure or IBSS
155 *
156 * @return Index in scantable, or error code if negative
157 */
158 static int is_network_compatible(wlan_adapter * adapter,
159 struct bss_descriptor * bss, u8 mode)
160 {
161 int matched = 0;
162
163 lbs_deb_enter(LBS_DEB_ASSOC);
164
165 if (bss->mode != mode)
166 goto done;
167
168 if ((matched = match_bss_no_security(&adapter->secinfo, bss))) {
169 goto done;
170 } else if ((matched = match_bss_static_wep(&adapter->secinfo, bss))) {
171 goto done;
172 } else if ((matched = match_bss_wpa(&adapter->secinfo, bss))) {
173 lbs_deb_scan(
174 "is_network_compatible() WPA: wpa_ie=%#x "
175 "wpa2_ie=%#x WEP=%s WPA=%s WPA2=%s "
176 "privacy=%#x\n", bss->wpa_ie[0], bss->rsn_ie[0],
177 adapter->secinfo.wep_enabled ? "e" : "d",
178 adapter->secinfo.WPAenabled ? "e" : "d",
179 adapter->secinfo.WPA2enabled ? "e" : "d",
180 bss->privacy);
181 goto done;
182 } else if ((matched = match_bss_wpa2(&adapter->secinfo, bss))) {
183 lbs_deb_scan(
184 "is_network_compatible() WPA2: wpa_ie=%#x "
185 "wpa2_ie=%#x WEP=%s WPA=%s WPA2=%s "
186 "privacy=%#x\n", bss->wpa_ie[0], bss->rsn_ie[0],
187 adapter->secinfo.wep_enabled ? "e" : "d",
188 adapter->secinfo.WPAenabled ? "e" : "d",
189 adapter->secinfo.WPA2enabled ? "e" : "d",
190 bss->privacy);
191 goto done;
192 } else if ((matched = match_bss_dynamic_wep(&adapter->secinfo, bss))) {
193 lbs_deb_scan(
194 "is_network_compatible() dynamic WEP: "
195 "wpa_ie=%#x wpa2_ie=%#x privacy=%#x\n",
196 bss->wpa_ie[0],
197 bss->rsn_ie[0],
198 bss->privacy);
199 goto done;
200 }
201
202 /* bss security settings don't match those configured on card */
203 lbs_deb_scan(
204 "is_network_compatible() FAILED: wpa_ie=%#x "
205 "wpa2_ie=%#x WEP=%s WPA=%s WPA2=%s privacy=%#x\n",
206 bss->wpa_ie[0], bss->rsn_ie[0],
207 adapter->secinfo.wep_enabled ? "e" : "d",
208 adapter->secinfo.WPAenabled ? "e" : "d",
209 adapter->secinfo.WPA2enabled ? "e" : "d",
210 bss->privacy);
211
212 done:
213 lbs_deb_leave(LBS_DEB_SCAN);
214 return matched;
215 }
216
217 /**
218 * @brief Post process the scan table after a new scan command has completed
219 *
220 * Inspect each entry of the scan table and try to find an entry that
221 * matches our current associated/joined network from the scan. If
222 * one is found, update the stored copy of the bssdescriptor for our
223 * current network.
224 *
225 * Debug dump the current scan table contents if compiled accordingly.
226 *
227 * @param priv A pointer to wlan_private structure
228 *
229 * @return void
230 */
231 static void wlan_scan_process_results(wlan_private * priv)
232 {
233 wlan_adapter *adapter = priv->adapter;
234 struct bss_descriptor * iter_bss;
235
236 if (adapter->connect_status == libertas_connected)
237 return;
238
239 mutex_lock(&adapter->lock);
240 list_for_each_entry (iter_bss, &adapter->network_list, list) {
241 lbs_deb_scan("Scan:(%02d) " MAC_FMT ", RSSI[%03d], SSID[%s]\n",
242 i++, MAC_ARG(iter_bss->bssid), (s32) iter_bss->rssi,
243 iter_bss->ssid.ssid);
244 }
245 mutex_unlock(&adapter->lock);
246 }
247
248 /**
249 * @brief Create a channel list for the driver to scan based on region info
250 *
251 * Use the driver region/band information to construct a comprehensive list
252 * of channels to scan. This routine is used for any scan that is not
253 * provided a specific channel list to scan.
254 *
255 * @param priv A pointer to wlan_private structure
256 * @param scanchanlist Output parameter: resulting channel list to scan
257 * @param filteredscan Flag indicating whether or not a BSSID or SSID filter
258 * is being sent in the command to firmware. Used to
259 * increase the number of channels sent in a scan
260 * command and to disable the firmware channel scan
261 * filter.
262 *
263 * @return void
264 */
265 static void wlan_scan_create_channel_list(wlan_private * priv,
266 struct chanscanparamset * scanchanlist,
267 u8 filteredscan)
268 {
269
270 wlan_adapter *adapter = priv->adapter;
271 struct region_channel *scanregion;
272 struct chan_freq_power *cfp;
273 int rgnidx;
274 int chanidx;
275 int nextchan;
276 u8 scantype;
277
278 chanidx = 0;
279
280 /* Set the default scan type to the user specified type, will later
281 * be changed to passive on a per channel basis if restricted by
282 * regulatory requirements (11d or 11h)
283 */
284 scantype = adapter->scantype;
285
286 for (rgnidx = 0; rgnidx < ARRAY_SIZE(adapter->region_channel); rgnidx++) {
287 if (priv->adapter->enable11d &&
288 adapter->connect_status != libertas_connected) {
289 /* Scan all the supported chan for the first scan */
290 if (!adapter->universal_channel[rgnidx].valid)
291 continue;
292 scanregion = &adapter->universal_channel[rgnidx];
293
294 /* clear the parsed_region_chan for the first scan */
295 memset(&adapter->parsed_region_chan, 0x00,
296 sizeof(adapter->parsed_region_chan));
297 } else {
298 if (!adapter->region_channel[rgnidx].valid)
299 continue;
300 scanregion = &adapter->region_channel[rgnidx];
301 }
302
303 for (nextchan = 0;
304 nextchan < scanregion->nrcfp; nextchan++, chanidx++) {
305
306 cfp = scanregion->CFP + nextchan;
307
308 if (priv->adapter->enable11d) {
309 scantype =
310 libertas_get_scan_type_11d(cfp->channel,
311 &adapter->
312 parsed_region_chan);
313 }
314
315 switch (scanregion->band) {
316 case BAND_B:
317 case BAND_G:
318 default:
319 scanchanlist[chanidx].radiotype =
320 cmd_scan_radio_type_bg;
321 break;
322 }
323
324 if (scantype == cmd_scan_type_passive) {
325 scanchanlist[chanidx].maxscantime =
326 cpu_to_le16
327 (MRVDRV_PASSIVE_SCAN_CHAN_TIME);
328 scanchanlist[chanidx].chanscanmode.passivescan =
329 1;
330 } else {
331 scanchanlist[chanidx].maxscantime =
332 cpu_to_le16
333 (MRVDRV_ACTIVE_SCAN_CHAN_TIME);
334 scanchanlist[chanidx].chanscanmode.passivescan =
335 0;
336 }
337
338 scanchanlist[chanidx].channumber = cfp->channel;
339
340 if (filteredscan) {
341 scanchanlist[chanidx].chanscanmode.
342 disablechanfilt = 1;
343 }
344 }
345 }
346 }
347
348 /**
349 * @brief Construct a wlan_scan_cmd_config structure to use in issue scan cmds
350 *
351 * Application layer or other functions can invoke wlan_scan_networks
352 * with a scan configuration supplied in a wlan_ioctl_user_scan_cfg struct.
353 * This structure is used as the basis of one or many wlan_scan_cmd_config
354 * commands that are sent to the command processing module and sent to
355 * firmware.
356 *
357 * Create a wlan_scan_cmd_config based on the following user supplied
358 * parameters (if present):
359 * - SSID filter
360 * - BSSID filter
361 * - Number of Probes to be sent
362 * - channel list
363 *
364 * If the SSID or BSSID filter is not present, disable/clear the filter.
365 * If the number of probes is not set, use the adapter default setting
366 * Qualify the channel
367 *
368 * @param priv A pointer to wlan_private structure
369 * @param puserscanin NULL or pointer to scan configuration parameters
370 * @param ppchantlvout Output parameter: Pointer to the start of the
371 * channel TLV portion of the output scan config
372 * @param pscanchanlist Output parameter: Pointer to the resulting channel
373 * list to scan
374 * @param pmaxchanperscan Output parameter: Number of channels to scan for
375 * each issuance of the firmware scan command
376 * @param pfilteredscan Output parameter: Flag indicating whether or not
377 * a BSSID or SSID filter is being sent in the
378 * command to firmware. Used to increase the number
379 * of channels sent in a scan command and to
380 * disable the firmware channel scan filter.
381 * @param pscancurrentonly Output parameter: Flag indicating whether or not
382 * we are only scanning our current active channel
383 *
384 * @return resulting scan configuration
385 */
386 static struct wlan_scan_cmd_config *
387 wlan_scan_setup_scan_config(wlan_private * priv,
388 const struct wlan_ioctl_user_scan_cfg * puserscanin,
389 struct mrvlietypes_chanlistparamset ** ppchantlvout,
390 struct chanscanparamset * pscanchanlist,
391 int *pmaxchanperscan,
392 u8 * pfilteredscan,
393 u8 * pscancurrentonly)
394 {
395 wlan_adapter *adapter = priv->adapter;
396 struct mrvlietypes_numprobes *pnumprobestlv;
397 struct mrvlietypes_ssidparamset *pssidtlv;
398 struct wlan_scan_cmd_config * pscancfgout = NULL;
399 u8 *ptlvpos;
400 u16 numprobes;
401 int chanidx;
402 int scantype;
403 int scandur;
404 int channel;
405 int radiotype;
406
407 pscancfgout = kzalloc(MAX_SCAN_CFG_ALLOC, GFP_KERNEL);
408 if (pscancfgout == NULL)
409 goto out;
410
411 /* The tlvbufferlen is calculated for each scan command. The TLVs added
412 * in this routine will be preserved since the routine that sends
413 * the command will append channelTLVs at *ppchantlvout. The difference
414 * between the *ppchantlvout and the tlvbuffer start will be used
415 * to calculate the size of anything we add in this routine.
416 */
417 pscancfgout->tlvbufferlen = 0;
418
419 /* Running tlv pointer. Assigned to ppchantlvout at end of function
420 * so later routines know where channels can be added to the command buf
421 */
422 ptlvpos = pscancfgout->tlvbuffer;
423
424 /*
425 * Set the initial scan paramters for progressive scanning. If a specific
426 * BSSID or SSID is used, the number of channels in the scan command
427 * will be increased to the absolute maximum
428 */
429 *pmaxchanperscan = MRVDRV_CHANNELS_PER_SCAN_CMD;
430
431 /* Initialize the scan as un-filtered by firmware, set to TRUE below if
432 * a SSID or BSSID filter is sent in the command
433 */
434 *pfilteredscan = 0;
435
436 /* Initialize the scan as not being only on the current channel. If
437 * the channel list is customized, only contains one channel, and
438 * is the active channel, this is set true and data flow is not halted.
439 */
440 *pscancurrentonly = 0;
441
442 if (puserscanin) {
443
444 /* Set the bss type scan filter, use adapter setting if unset */
445 pscancfgout->bsstype =
446 (puserscanin->bsstype ? puserscanin->bsstype : adapter->
447 scanmode);
448
449 /* Set the number of probes to send, use adapter setting if unset */
450 numprobes = (puserscanin->numprobes ? puserscanin->numprobes :
451 adapter->scanprobes);
452
453 /*
454 * Set the BSSID filter to the incoming configuration,
455 * if non-zero. If not set, it will remain disabled (all zeros).
456 */
457 memcpy(pscancfgout->bssid, puserscanin->bssid,
458 sizeof(pscancfgout->bssid));
459
460 if (puserscanin->ssid_len) {
461 pssidtlv =
462 (struct mrvlietypes_ssidparamset *) pscancfgout->
463 tlvbuffer;
464 pssidtlv->header.type = cpu_to_le16(TLV_TYPE_SSID);
465 pssidtlv->header.len = cpu_to_le16(puserscanin->ssid_len);
466 memcpy(pssidtlv->ssid, puserscanin->ssid,
467 puserscanin->ssid_len);
468 ptlvpos += sizeof(pssidtlv->header) + puserscanin->ssid_len;
469 }
470
471 /*
472 * The default number of channels sent in the command is low to
473 * ensure the response buffer from the firmware does not truncate
474 * scan results. That is not an issue with an SSID or BSSID
475 * filter applied to the scan results in the firmware.
476 */
477 if ( puserscanin->ssid_len
478 || (compare_ether_addr(pscancfgout->bssid, &zeromac[0]) != 0)) {
479 *pmaxchanperscan = MRVDRV_MAX_CHANNELS_PER_SCAN;
480 *pfilteredscan = 1;
481 }
482 } else {
483 pscancfgout->bsstype = adapter->scanmode;
484 numprobes = adapter->scanprobes;
485 }
486
487 /* If the input config or adapter has the number of Probes set, add tlv */
488 if (numprobes) {
489 pnumprobestlv = (struct mrvlietypes_numprobes *) ptlvpos;
490 pnumprobestlv->header.type =
491 cpu_to_le16(TLV_TYPE_NUMPROBES);
492 pnumprobestlv->header.len = sizeof(pnumprobestlv->numprobes);
493 pnumprobestlv->numprobes = cpu_to_le16(numprobes);
494
495 ptlvpos +=
496 sizeof(pnumprobestlv->header) + pnumprobestlv->header.len;
497
498 pnumprobestlv->header.len =
499 cpu_to_le16(pnumprobestlv->header.len);
500 }
501
502 /*
503 * Set the output for the channel TLV to the address in the tlv buffer
504 * past any TLVs that were added in this fuction (SSID, numprobes).
505 * channel TLVs will be added past this for each scan command, preserving
506 * the TLVs that were previously added.
507 */
508 *ppchantlvout = (struct mrvlietypes_chanlistparamset *) ptlvpos;
509
510 if (puserscanin && puserscanin->chanlist[0].channumber) {
511
512 lbs_deb_scan("Scan: Using supplied channel list\n");
513
514 for (chanidx = 0;
515 chanidx < WLAN_IOCTL_USER_SCAN_CHAN_MAX
516 && puserscanin->chanlist[chanidx].channumber; chanidx++) {
517
518 channel = puserscanin->chanlist[chanidx].channumber;
519 (pscanchanlist + chanidx)->channumber = channel;
520
521 radiotype = puserscanin->chanlist[chanidx].radiotype;
522 (pscanchanlist + chanidx)->radiotype = radiotype;
523
524 scantype = puserscanin->chanlist[chanidx].scantype;
525
526 if (scantype == cmd_scan_type_passive) {
527 (pscanchanlist +
528 chanidx)->chanscanmode.passivescan = 1;
529 } else {
530 (pscanchanlist +
531 chanidx)->chanscanmode.passivescan = 0;
532 }
533
534 if (puserscanin->chanlist[chanidx].scantime) {
535 scandur =
536 puserscanin->chanlist[chanidx].scantime;
537 } else {
538 if (scantype == cmd_scan_type_passive) {
539 scandur = MRVDRV_PASSIVE_SCAN_CHAN_TIME;
540 } else {
541 scandur = MRVDRV_ACTIVE_SCAN_CHAN_TIME;
542 }
543 }
544
545 (pscanchanlist + chanidx)->minscantime =
546 cpu_to_le16(scandur);
547 (pscanchanlist + chanidx)->maxscantime =
548 cpu_to_le16(scandur);
549 }
550
551 /* Check if we are only scanning the current channel */
552 if ((chanidx == 1) && (puserscanin->chanlist[0].channumber
553 ==
554 priv->adapter->curbssparams.channel)) {
555 *pscancurrentonly = 1;
556 lbs_deb_scan("Scan: Scanning current channel only");
557 }
558
559 } else {
560 lbs_deb_scan("Scan: Creating full region channel list\n");
561 wlan_scan_create_channel_list(priv, pscanchanlist,
562 *pfilteredscan);
563 }
564
565 out:
566 return pscancfgout;
567 }
568
569 /**
570 * @brief Construct and send multiple scan config commands to the firmware
571 *
572 * Previous routines have created a wlan_scan_cmd_config with any requested
573 * TLVs. This function splits the channel TLV into maxchanperscan lists
574 * and sends the portion of the channel TLV along with the other TLVs
575 * to the wlan_cmd routines for execution in the firmware.
576 *
577 * @param priv A pointer to wlan_private structure
578 * @param maxchanperscan Maximum number channels to be included in each
579 * scan command sent to firmware
580 * @param filteredscan Flag indicating whether or not a BSSID or SSID
581 * filter is being used for the firmware command
582 * scan command sent to firmware
583 * @param pscancfgout Scan configuration used for this scan.
584 * @param pchantlvout Pointer in the pscancfgout where the channel TLV
585 * should start. This is past any other TLVs that
586 * must be sent down in each firmware command.
587 * @param pscanchanlist List of channels to scan in maxchanperscan segments
588 *
589 * @return 0 or error return otherwise
590 */
591 static int wlan_scan_channel_list(wlan_private * priv,
592 int maxchanperscan,
593 u8 filteredscan,
594 struct wlan_scan_cmd_config * pscancfgout,
595 struct mrvlietypes_chanlistparamset * pchantlvout,
596 struct chanscanparamset * pscanchanlist,
597 const struct wlan_ioctl_user_scan_cfg * puserscanin,
598 int full_scan)
599 {
600 struct chanscanparamset *ptmpchan;
601 struct chanscanparamset *pstartchan;
602 u8 scanband;
603 int doneearly;
604 int tlvidx;
605 int ret = 0;
606 int scanned = 0;
607 union iwreq_data wrqu;
608
609 lbs_deb_enter(LBS_DEB_ASSOC);
610
611 if (pscancfgout == 0 || pchantlvout == 0 || pscanchanlist == 0) {
612 lbs_deb_scan("Scan: Null detect: %p, %p, %p\n",
613 pscancfgout, pchantlvout, pscanchanlist);
614 return -1;
615 }
616
617 pchantlvout->header.type = cpu_to_le16(TLV_TYPE_CHANLIST);
618
619 /* Set the temp channel struct pointer to the start of the desired list */
620 ptmpchan = pscanchanlist;
621
622 if (priv->adapter->last_scanned_channel && !puserscanin)
623 ptmpchan += priv->adapter->last_scanned_channel;
624
625 /* Loop through the desired channel list, sending a new firmware scan
626 * commands for each maxchanperscan channels (or for 1,6,11 individually
627 * if configured accordingly)
628 */
629 while (ptmpchan->channumber) {
630
631 tlvidx = 0;
632 pchantlvout->header.len = 0;
633 scanband = ptmpchan->radiotype;
634 pstartchan = ptmpchan;
635 doneearly = 0;
636
637 /* Construct the channel TLV for the scan command. Continue to
638 * insert channel TLVs until:
639 * - the tlvidx hits the maximum configured per scan command
640 * - the next channel to insert is 0 (end of desired channel list)
641 * - doneearly is set (controlling individual scanning of 1,6,11)
642 */
643 while (tlvidx < maxchanperscan && ptmpchan->channumber
644 && !doneearly && scanned < 2) {
645
646 lbs_deb_scan(
647 "Scan: Chan(%3d), Radio(%d), mode(%d,%d), Dur(%d)\n",
648 ptmpchan->channumber, ptmpchan->radiotype,
649 ptmpchan->chanscanmode.passivescan,
650 ptmpchan->chanscanmode.disablechanfilt,
651 ptmpchan->maxscantime);
652
653 /* Copy the current channel TLV to the command being prepared */
654 memcpy(pchantlvout->chanscanparam + tlvidx,
655 ptmpchan, sizeof(pchantlvout->chanscanparam));
656
657 /* Increment the TLV header length by the size appended */
658 pchantlvout->header.len +=
659 sizeof(pchantlvout->chanscanparam);
660
661 /*
662 * The tlv buffer length is set to the number of bytes of the
663 * between the channel tlv pointer and the start of the
664 * tlv buffer. This compensates for any TLVs that were appended
665 * before the channel list.
666 */
667 pscancfgout->tlvbufferlen = ((u8 *) pchantlvout
668 - pscancfgout->tlvbuffer);
669
670 /* Add the size of the channel tlv header and the data length */
671 pscancfgout->tlvbufferlen +=
672 (sizeof(pchantlvout->header)
673 + pchantlvout->header.len);
674
675 /* Increment the index to the channel tlv we are constructing */
676 tlvidx++;
677
678 doneearly = 0;
679
680 /* Stop the loop if the *current* channel is in the 1,6,11 set
681 * and we are not filtering on a BSSID or SSID.
682 */
683 if (!filteredscan && (ptmpchan->channumber == 1
684 || ptmpchan->channumber == 6
685 || ptmpchan->channumber == 11)) {
686 doneearly = 1;
687 }
688
689 /* Increment the tmp pointer to the next channel to be scanned */
690 ptmpchan++;
691 scanned++;
692
693 /* Stop the loop if the *next* channel is in the 1,6,11 set.
694 * This will cause it to be the only channel scanned on the next
695 * interation
696 */
697 if (!filteredscan && (ptmpchan->channumber == 1
698 || ptmpchan->channumber == 6
699 || ptmpchan->channumber == 11)) {
700 doneearly = 1;
701 }
702 }
703
704 /* Send the scan command to the firmware with the specified cfg */
705 ret = libertas_prepare_and_send_command(priv, cmd_802_11_scan, 0,
706 0, 0, pscancfgout);
707 if (scanned >= 2 && !full_scan) {
708 ret = 0;
709 goto done;
710 }
711 scanned = 0;
712 }
713
714 done:
715 priv->adapter->last_scanned_channel = ptmpchan->channumber;
716
717 /* Tell userspace the scan table has been updated */
718 memset(&wrqu, 0, sizeof(union iwreq_data));
719 wireless_send_event(priv->dev, SIOCGIWSCAN, &wrqu, NULL);
720
721 lbs_deb_leave_args(LBS_DEB_SCAN, "ret %d", ret);
722 return ret;
723 }
724
725 static void
726 clear_selected_scan_list_entries(wlan_adapter * adapter,
727 const struct wlan_ioctl_user_scan_cfg * scan_cfg)
728 {
729 struct bss_descriptor * bss;
730 struct bss_descriptor * safe;
731 u32 clear_ssid_flag = 0, clear_bssid_flag = 0;
732
733 if (!scan_cfg)
734 return;
735
736 if (scan_cfg->clear_ssid && scan_cfg->ssid_len)
737 clear_ssid_flag = 1;
738
739 if (scan_cfg->clear_bssid
740 && (compare_ether_addr(scan_cfg->bssid, &zeromac[0]) != 0)
741 && (compare_ether_addr(scan_cfg->bssid, &bcastmac[0]) != 0)) {
742 clear_bssid_flag = 1;
743 }
744
745 if (!clear_ssid_flag && !clear_bssid_flag)
746 return;
747
748 mutex_lock(&adapter->lock);
749 list_for_each_entry_safe (bss, safe, &adapter->network_list, list) {
750 u32 clear = 0;
751
752 /* Check for an SSID match */
753 if ( clear_ssid_flag
754 && (bss->ssid.ssidlength == scan_cfg->ssid_len)
755 && !memcmp(bss->ssid.ssid, scan_cfg->ssid, bss->ssid.ssidlength))
756 clear = 1;
757
758 /* Check for a BSSID match */
759 if ( clear_bssid_flag
760 && !compare_ether_addr(bss->bssid, scan_cfg->bssid))
761 clear = 1;
762
763 if (clear) {
764 list_move_tail (&bss->list, &adapter->network_free_list);
765 clear_bss_descriptor(bss);
766 }
767 }
768 mutex_unlock(&adapter->lock);
769 }
770
771
772 /**
773 * @brief Internal function used to start a scan based on an input config
774 *
775 * Use the input user scan configuration information when provided in
776 * order to send the appropriate scan commands to firmware to populate or
777 * update the internal driver scan table
778 *
779 * @param priv A pointer to wlan_private structure
780 * @param puserscanin Pointer to the input configuration for the requested
781 * scan.
782 *
783 * @return 0 or < 0 if error
784 */
785 int wlan_scan_networks(wlan_private * priv,
786 const struct wlan_ioctl_user_scan_cfg * puserscanin,
787 int full_scan)
788 {
789 wlan_adapter * adapter = priv->adapter;
790 struct mrvlietypes_chanlistparamset *pchantlvout;
791 struct chanscanparamset * scan_chan_list = NULL;
792 struct wlan_scan_cmd_config * scan_cfg = NULL;
793 u8 filteredscan;
794 u8 scancurrentchanonly;
795 int maxchanperscan;
796 int ret;
797
798 lbs_deb_enter(LBS_DEB_ASSOC);
799
800 scan_chan_list = kzalloc(sizeof(struct chanscanparamset) *
801 WLAN_IOCTL_USER_SCAN_CHAN_MAX, GFP_KERNEL);
802 if (scan_chan_list == NULL) {
803 ret = -ENOMEM;
804 goto out;
805 }
806
807 scan_cfg = wlan_scan_setup_scan_config(priv,
808 puserscanin,
809 &pchantlvout,
810 scan_chan_list,
811 &maxchanperscan,
812 &filteredscan,
813 &scancurrentchanonly);
814 if (scan_cfg == NULL) {
815 ret = -ENOMEM;
816 goto out;
817 }
818
819 clear_selected_scan_list_entries(adapter, puserscanin);
820
821 /* Keep the data path active if we are only scanning our current channel */
822 if (!scancurrentchanonly) {
823 netif_stop_queue(priv->dev);
824 netif_carrier_off(priv->dev);
825 netif_stop_queue(priv->mesh_dev);
826 netif_carrier_off(priv->mesh_dev);
827 }
828
829 ret = wlan_scan_channel_list(priv,
830 maxchanperscan,
831 filteredscan,
832 scan_cfg,
833 pchantlvout,
834 scan_chan_list,
835 puserscanin,
836 full_scan);
837
838 /* Process the resulting scan table:
839 * - Remove any bad ssids
840 * - Update our current BSS information from scan data
841 */
842 wlan_scan_process_results(priv);
843
844 if (priv->adapter->connect_status == libertas_connected) {
845 netif_carrier_on(priv->dev);
846 netif_wake_queue(priv->dev);
847 netif_carrier_on(priv->mesh_dev);
848 netif_wake_queue(priv->mesh_dev);
849 }
850
851 out:
852 if (scan_cfg)
853 kfree(scan_cfg);
854
855 if (scan_chan_list)
856 kfree(scan_chan_list);
857
858 lbs_deb_leave_args(LBS_DEB_SCAN, "ret %d", ret);
859 return ret;
860 }
861
862 /**
863 * @brief Inspect the scan response buffer for pointers to expected TLVs
864 *
865 * TLVs can be included at the end of the scan response BSS information.
866 * Parse the data in the buffer for pointers to TLVs that can potentially
867 * be passed back in the response
868 *
869 * @param ptlv Pointer to the start of the TLV buffer to parse
870 * @param tlvbufsize size of the TLV buffer
871 * @param ptsftlv Output parameter: Pointer to the TSF TLV if found
872 *
873 * @return void
874 */
875 static
876 void wlan_ret_802_11_scan_get_tlv_ptrs(struct mrvlietypes_data * ptlv,
877 int tlvbufsize,
878 struct mrvlietypes_tsftimestamp ** ptsftlv)
879 {
880 struct mrvlietypes_data *pcurrenttlv;
881 int tlvbufleft;
882 u16 tlvtype;
883 u16 tlvlen;
884
885 pcurrenttlv = ptlv;
886 tlvbufleft = tlvbufsize;
887 *ptsftlv = NULL;
888
889 lbs_deb_scan("SCAN_RESP: tlvbufsize = %d\n", tlvbufsize);
890 lbs_dbg_hex("SCAN_RESP: TLV Buf", (u8 *) ptlv, tlvbufsize);
891
892 while (tlvbufleft >= sizeof(struct mrvlietypesheader)) {
893 tlvtype = le16_to_cpu(pcurrenttlv->header.type);
894 tlvlen = le16_to_cpu(pcurrenttlv->header.len);
895
896 switch (tlvtype) {
897 case TLV_TYPE_TSFTIMESTAMP:
898 *ptsftlv = (struct mrvlietypes_tsftimestamp *) pcurrenttlv;
899 break;
900
901 default:
902 lbs_deb_scan("SCAN_RESP: Unhandled TLV = %d\n",
903 tlvtype);
904 /* Give up, this seems corrupted */
905 return;
906 } /* switch */
907
908 tlvbufleft -= (sizeof(ptlv->header) + tlvlen);
909 pcurrenttlv =
910 (struct mrvlietypes_data *) (pcurrenttlv->Data + tlvlen);
911 } /* while */
912 }
913
914 /**
915 * @brief Interpret a BSS scan response returned from the firmware
916 *
917 * Parse the various fixed fields and IEs passed back for a a BSS probe
918 * response or beacon from the scan command. Record information as needed
919 * in the scan table struct bss_descriptor for that entry.
920 *
921 * @param bss Output parameter: Pointer to the BSS Entry
922 *
923 * @return 0 or -1
924 */
925 static int libertas_process_bss(struct bss_descriptor * bss,
926 u8 ** pbeaconinfo, int *bytesleft)
927 {
928 enum ieeetypes_elementid elemID;
929 struct ieeetypes_fhparamset *pFH;
930 struct ieeetypes_dsparamset *pDS;
931 struct ieeetypes_cfparamset *pCF;
932 struct ieeetypes_ibssparamset *pibss;
933 struct ieeetypes_capinfo *pcap;
934 struct WLAN_802_11_FIXED_IEs fixedie;
935 u8 *pcurrentptr;
936 u8 *pRate;
937 u8 elemlen;
938 u8 bytestocopy;
939 u8 ratesize;
940 u16 beaconsize;
941 u8 founddatarateie;
942 int bytesleftforcurrentbeacon;
943 int ret;
944
945 struct IE_WPA *pIe;
946 const u8 oui01[4] = { 0x00, 0x50, 0xf2, 0x01 };
947
948 struct ieeetypes_countryinfoset *pcountryinfo;
949
950 lbs_deb_enter(LBS_DEB_ASSOC);
951
952 founddatarateie = 0;
953 ratesize = 0;
954 beaconsize = 0;
955
956 if (*bytesleft >= sizeof(beaconsize)) {
957 /* Extract & convert beacon size from the command buffer */
958 memcpy(&beaconsize, *pbeaconinfo, sizeof(beaconsize));
959 beaconsize = le16_to_cpu(beaconsize);
960 *bytesleft -= sizeof(beaconsize);
961 *pbeaconinfo += sizeof(beaconsize);
962 }
963
964 if (beaconsize == 0 || beaconsize > *bytesleft) {
965
966 *pbeaconinfo += *bytesleft;
967 *bytesleft = 0;
968
969 return -1;
970 }
971
972 /* Initialize the current working beacon pointer for this BSS iteration */
973 pcurrentptr = *pbeaconinfo;
974
975 /* Advance the return beacon pointer past the current beacon */
976 *pbeaconinfo += beaconsize;
977 *bytesleft -= beaconsize;
978
979 bytesleftforcurrentbeacon = beaconsize;
980
981 memcpy(bss->bssid, pcurrentptr, ETH_ALEN);
982 lbs_deb_scan("process_bss: AP BSSID " MAC_FMT "\n", MAC_ARG(bss->bssid));
983
984 pcurrentptr += ETH_ALEN;
985 bytesleftforcurrentbeacon -= ETH_ALEN;
986
987 if (bytesleftforcurrentbeacon < 12) {
988 lbs_deb_scan("process_bss: Not enough bytes left\n");
989 return -1;
990 }
991
992 /*
993 * next 4 fields are RSSI, time stamp, beacon interval,
994 * and capability information
995 */
996
997 /* RSSI is 1 byte long */
998 bss->rssi = le32_to_cpu((long)(*pcurrentptr));
999 lbs_deb_scan("process_bss: RSSI=%02X\n", *pcurrentptr);
1000 pcurrentptr += 1;
1001 bytesleftforcurrentbeacon -= 1;
1002
1003 /* time stamp is 8 bytes long */
1004 memcpy(fixedie.timestamp, pcurrentptr, 8);
1005 memcpy(bss->timestamp, pcurrentptr, 8);
1006 pcurrentptr += 8;
1007 bytesleftforcurrentbeacon -= 8;
1008
1009 /* beacon interval is 2 bytes long */
1010 memcpy(&fixedie.beaconinterval, pcurrentptr, 2);
1011 bss->beaconperiod = le16_to_cpu(fixedie.beaconinterval);
1012 pcurrentptr += 2;
1013 bytesleftforcurrentbeacon -= 2;
1014
1015 /* capability information is 2 bytes long */
1016 memcpy(&fixedie.capabilities, pcurrentptr, 2);
1017 lbs_deb_scan("process_bss: fixedie.capabilities=0x%X\n",
1018 fixedie.capabilities);
1019 fixedie.capabilities = le16_to_cpu(fixedie.capabilities);
1020 pcap = (struct ieeetypes_capinfo *) & fixedie.capabilities;
1021 memcpy(&bss->cap, pcap, sizeof(struct ieeetypes_capinfo));
1022 pcurrentptr += 2;
1023 bytesleftforcurrentbeacon -= 2;
1024
1025 /* rest of the current buffer are IE's */
1026 lbs_deb_scan("process_bss: IE length for this AP = %d\n",
1027 bytesleftforcurrentbeacon);
1028
1029 lbs_dbg_hex("process_bss: IE info", (u8 *) pcurrentptr,
1030 bytesleftforcurrentbeacon);
1031
1032 if (pcap->privacy) {
1033 lbs_deb_scan("process_bss: AP WEP enabled\n");
1034 bss->privacy = wlan802_11privfilter8021xWEP;
1035 } else {
1036 bss->privacy = wlan802_11privfilteracceptall;
1037 }
1038
1039 if (pcap->ibss == 1) {
1040 bss->mode = IW_MODE_ADHOC;
1041 } else {
1042 bss->mode = IW_MODE_INFRA;
1043 }
1044
1045 /* process variable IE */
1046 while (bytesleftforcurrentbeacon >= 2) {
1047 elemID = (enum ieeetypes_elementid) (*((u8 *) pcurrentptr));
1048 elemlen = *((u8 *) pcurrentptr + 1);
1049
1050 if (bytesleftforcurrentbeacon < elemlen) {
1051 lbs_deb_scan("process_bss: error in processing IE, "
1052 "bytes left < IE length\n");
1053 bytesleftforcurrentbeacon = 0;
1054 continue;
1055 }
1056
1057 switch (elemID) {
1058 case SSID:
1059 bss->ssid.ssidlength = elemlen;
1060 memcpy(bss->ssid.ssid, (pcurrentptr + 2), elemlen);
1061 lbs_deb_scan("ssid '%s'\n", bss->ssid.ssid);
1062 break;
1063
1064 case SUPPORTED_RATES:
1065 memcpy(bss->datarates, (pcurrentptr + 2), elemlen);
1066 memmove(bss->libertas_supported_rates, (pcurrentptr + 2),
1067 elemlen);
1068 ratesize = elemlen;
1069 founddatarateie = 1;
1070 break;
1071
1072 case EXTRA_IE:
1073 lbs_deb_scan("process_bss: EXTRA_IE Found!\n");
1074 break;
1075
1076 case FH_PARAM_SET:
1077 pFH = (struct ieeetypes_fhparamset *) pcurrentptr;
1078 memmove(&bss->phyparamset.fhparamset, pFH,
1079 sizeof(struct ieeetypes_fhparamset));
1080 bss->phyparamset.fhparamset.dwelltime
1081 = le16_to_cpu(bss->phyparamset.fhparamset.dwelltime);
1082 break;
1083
1084 case DS_PARAM_SET:
1085 pDS = (struct ieeetypes_dsparamset *) pcurrentptr;
1086 bss->channel = pDS->currentchan;
1087 memcpy(&bss->phyparamset.dsparamset, pDS,
1088 sizeof(struct ieeetypes_dsparamset));
1089 break;
1090
1091 case CF_PARAM_SET:
1092 pCF = (struct ieeetypes_cfparamset *) pcurrentptr;
1093 memcpy(&bss->ssparamset.cfparamset, pCF,
1094 sizeof(struct ieeetypes_cfparamset));
1095 break;
1096
1097 case IBSS_PARAM_SET:
1098 pibss = (struct ieeetypes_ibssparamset *) pcurrentptr;
1099 bss->atimwindow = le32_to_cpu(pibss->atimwindow);
1100 memmove(&bss->ssparamset.ibssparamset, pibss,
1101 sizeof(struct ieeetypes_ibssparamset));
1102 bss->ssparamset.ibssparamset.atimwindow
1103 = le16_to_cpu(bss->ssparamset.ibssparamset.atimwindow);
1104 break;
1105
1106 /* Handle Country Info IE */
1107 case COUNTRY_INFO:
1108 pcountryinfo = (struct ieeetypes_countryinfoset *) pcurrentptr;
1109 if (pcountryinfo->len < sizeof(pcountryinfo->countrycode)
1110 || pcountryinfo->len > 254) {
1111 lbs_deb_scan("process_bss: 11D- Err "
1112 "CountryInfo len =%d min=%zd max=254\n",
1113 pcountryinfo->len,
1114 sizeof(pcountryinfo->countrycode));
1115 ret = -1;
1116 goto done;
1117 }
1118
1119 memcpy(&bss->countryinfo,
1120 pcountryinfo, pcountryinfo->len + 2);
1121 lbs_dbg_hex("process_bss: 11D- CountryInfo:",
1122 (u8 *) pcountryinfo,
1123 (u32) (pcountryinfo->len + 2));
1124 break;
1125
1126 case EXTENDED_SUPPORTED_RATES:
1127 /*
1128 * only process extended supported rate
1129 * if data rate is already found.
1130 * data rate IE should come before
1131 * extended supported rate IE
1132 */
1133 if (founddatarateie) {
1134 if ((elemlen + ratesize) > WLAN_SUPPORTED_RATES) {
1135 bytestocopy =
1136 (WLAN_SUPPORTED_RATES - ratesize);
1137 } else {
1138 bytestocopy = elemlen;
1139 }
1140
1141 pRate = (u8 *) bss->datarates;
1142 pRate += ratesize;
1143 memmove(pRate, (pcurrentptr + 2), bytestocopy);
1144 pRate = (u8 *) bss->libertas_supported_rates;
1145 pRate += ratesize;
1146 memmove(pRate, (pcurrentptr + 2), bytestocopy);
1147 }
1148 break;
1149
1150 case VENDOR_SPECIFIC_221:
1151 #define IE_ID_LEN_FIELDS_BYTES 2
1152 pIe = (struct IE_WPA *)pcurrentptr;
1153
1154 if (memcmp(pIe->oui, oui01, sizeof(oui01)))
1155 break;
1156
1157 bss->wpa_ie_len = min(elemlen + IE_ID_LEN_FIELDS_BYTES,
1158 MAX_WPA_IE_LEN);
1159 memcpy(bss->wpa_ie, pcurrentptr, bss->wpa_ie_len);
1160 lbs_dbg_hex("process_bss: WPA IE", bss->wpa_ie, elemlen);
1161 break;
1162 case WPA2_IE:
1163 pIe = (struct IE_WPA *)pcurrentptr;
1164 bss->rsn_ie_len = min(elemlen + IE_ID_LEN_FIELDS_BYTES,
1165 MAX_WPA_IE_LEN);
1166 memcpy(bss->rsn_ie, pcurrentptr, bss->rsn_ie_len);
1167 lbs_dbg_hex("process_bss: RSN_IE", bss->rsn_ie, elemlen);
1168 break;
1169 case TIM:
1170 break;
1171
1172 case CHALLENGE_TEXT:
1173 break;
1174 }
1175
1176 pcurrentptr += elemlen + 2;
1177
1178 /* need to account for IE ID and IE len */
1179 bytesleftforcurrentbeacon -= (elemlen + 2);
1180
1181 } /* while (bytesleftforcurrentbeacon > 2) */
1182
1183 /* Timestamp */
1184 bss->last_scanned = jiffies;
1185
1186 ret = 0;
1187
1188 done:
1189 lbs_deb_leave_args(LBS_DEB_SCAN, "ret %d", ret);
1190 return ret;
1191 }
1192
1193 /**
1194 * @brief Compare two SSIDs
1195 *
1196 * @param ssid1 A pointer to ssid to compare
1197 * @param ssid2 A pointer to ssid to compare
1198 *
1199 * @return 0--ssid is same, otherwise is different
1200 */
1201 int libertas_SSID_cmp(struct WLAN_802_11_SSID *ssid1, struct WLAN_802_11_SSID *ssid2)
1202 {
1203 if (!ssid1 || !ssid2)
1204 return -1;
1205
1206 if (ssid1->ssidlength != ssid2->ssidlength)
1207 return -1;
1208
1209 return memcmp(ssid1->ssid, ssid2->ssid, ssid1->ssidlength);
1210 }
1211
1212 /**
1213 * @brief This function finds a specific compatible BSSID in the scan list
1214 *
1215 * @param adapter A pointer to wlan_adapter
1216 * @param bssid BSSID to find in the scan list
1217 * @param mode Network mode: Infrastructure or IBSS
1218 *
1219 * @return index in BSSID list, or error return code (< 0)
1220 */
1221 struct bss_descriptor * libertas_find_BSSID_in_list(wlan_adapter * adapter,
1222 u8 * bssid, u8 mode)
1223 {
1224 struct bss_descriptor * iter_bss;
1225 struct bss_descriptor * found_bss = NULL;
1226
1227 if (!bssid)
1228 return NULL;
1229
1230 lbs_dbg_hex("libertas_find_BSSID_in_list: looking for ",
1231 bssid, ETH_ALEN);
1232
1233 /* Look through the scan table for a compatible match. The loop will
1234 * continue past a matched bssid that is not compatible in case there
1235 * is an AP with multiple SSIDs assigned to the same BSSID
1236 */
1237 mutex_lock(&adapter->lock);
1238 list_for_each_entry (iter_bss, &adapter->network_list, list) {
1239 if (compare_ether_addr(iter_bss->bssid, bssid))
1240 continue; /* bssid doesn't match */
1241 switch (mode) {
1242 case IW_MODE_INFRA:
1243 case IW_MODE_ADHOC:
1244 if (!is_network_compatible(adapter, iter_bss, mode))
1245 break;
1246 found_bss = iter_bss;
1247 break;
1248 default:
1249 found_bss = iter_bss;
1250 break;
1251 }
1252 }
1253 mutex_unlock(&adapter->lock);
1254
1255 return found_bss;
1256 }
1257
1258 /**
1259 * @brief This function finds ssid in ssid list.
1260 *
1261 * @param adapter A pointer to wlan_adapter
1262 * @param ssid SSID to find in the list
1263 * @param bssid BSSID to qualify the SSID selection (if provided)
1264 * @param mode Network mode: Infrastructure or IBSS
1265 *
1266 * @return index in BSSID list
1267 */
1268 struct bss_descriptor * libertas_find_SSID_in_list(wlan_adapter * adapter,
1269 struct WLAN_802_11_SSID *ssid, u8 * bssid, u8 mode,
1270 int channel)
1271 {
1272 u8 bestrssi = 0;
1273 struct bss_descriptor * iter_bss = NULL;
1274 struct bss_descriptor * found_bss = NULL;
1275 struct bss_descriptor * tmp_oldest = NULL;
1276
1277 mutex_lock(&adapter->lock);
1278
1279 list_for_each_entry (iter_bss, &adapter->network_list, list) {
1280 if ( !tmp_oldest
1281 || (iter_bss->last_scanned < tmp_oldest->last_scanned))
1282 tmp_oldest = iter_bss;
1283
1284 if (libertas_SSID_cmp(&iter_bss->ssid, ssid) != 0)
1285 continue; /* ssid doesn't match */
1286 if (bssid && compare_ether_addr(iter_bss->bssid, bssid) != 0)
1287 continue; /* bssid doesn't match */
1288 if ((channel > 0) && (iter_bss->channel != channel))
1289 continue; /* channel doesn't match */
1290
1291 switch (mode) {
1292 case IW_MODE_INFRA:
1293 case IW_MODE_ADHOC:
1294 if (!is_network_compatible(adapter, iter_bss, mode))
1295 break;
1296
1297 if (bssid) {
1298 /* Found requested BSSID */
1299 found_bss = iter_bss;
1300 goto out;
1301 }
1302
1303 if (SCAN_RSSI(iter_bss->rssi) > bestrssi) {
1304 bestrssi = SCAN_RSSI(iter_bss->rssi);
1305 found_bss = iter_bss;
1306 }
1307 break;
1308 case IW_MODE_AUTO:
1309 default:
1310 if (SCAN_RSSI(iter_bss->rssi) > bestrssi) {
1311 bestrssi = SCAN_RSSI(iter_bss->rssi);
1312 found_bss = iter_bss;
1313 }
1314 break;
1315 }
1316 }
1317
1318 out:
1319 mutex_unlock(&adapter->lock);
1320 return found_bss;
1321 }
1322
1323 /**
1324 * @brief This function finds the best SSID in the Scan List
1325 *
1326 * Search the scan table for the best SSID that also matches the current
1327 * adapter network preference (infrastructure or adhoc)
1328 *
1329 * @param adapter A pointer to wlan_adapter
1330 *
1331 * @return index in BSSID list
1332 */
1333 struct bss_descriptor * libertas_find_best_SSID_in_list(wlan_adapter * adapter,
1334 u8 mode)
1335 {
1336 u8 bestrssi = 0;
1337 struct bss_descriptor * iter_bss;
1338 struct bss_descriptor * best_bss = NULL;
1339
1340 mutex_lock(&adapter->lock);
1341
1342 list_for_each_entry (iter_bss, &adapter->network_list, list) {
1343 switch (mode) {
1344 case IW_MODE_INFRA:
1345 case IW_MODE_ADHOC:
1346 if (!is_network_compatible(adapter, iter_bss, mode))
1347 break;
1348 if (SCAN_RSSI(iter_bss->rssi) <= bestrssi)
1349 break;
1350 bestrssi = SCAN_RSSI(iter_bss->rssi);
1351 best_bss = iter_bss;
1352 break;
1353 case IW_MODE_AUTO:
1354 default:
1355 if (SCAN_RSSI(iter_bss->rssi) <= bestrssi)
1356 break;
1357 bestrssi = SCAN_RSSI(iter_bss->rssi);
1358 best_bss = iter_bss;
1359 break;
1360 }
1361 }
1362
1363 mutex_unlock(&adapter->lock);
1364 return best_bss;
1365 }
1366
1367 /**
1368 * @brief Find the AP with specific ssid in the scan list
1369 *
1370 * @param priv A pointer to wlan_private structure
1371 * @param pSSID A pointer to AP's ssid
1372 *
1373 * @return 0--success, otherwise--fail
1374 */
1375 int libertas_find_best_network_SSID(wlan_private * priv,
1376 struct WLAN_802_11_SSID *ssid,
1377 u8 preferred_mode, u8 *out_mode)
1378 {
1379 wlan_adapter *adapter = priv->adapter;
1380 int ret = -1;
1381 struct bss_descriptor * found;
1382
1383 lbs_deb_enter(LBS_DEB_ASSOC);
1384
1385 memset(ssid, 0, sizeof(struct WLAN_802_11_SSID));
1386
1387 wlan_scan_networks(priv, NULL, 1);
1388 if (adapter->surpriseremoved)
1389 return -1;
1390
1391 wait_event_interruptible(adapter->cmd_pending, !adapter->nr_cmd_pending);
1392
1393 found = libertas_find_best_SSID_in_list(adapter, preferred_mode);
1394 if (found && (found->ssid.ssidlength > 0)) {
1395 memcpy(ssid, &found->ssid, sizeof(struct WLAN_802_11_SSID));
1396 *out_mode = found->mode;
1397 ret = 0;
1398 }
1399
1400 lbs_deb_leave_args(LBS_DEB_SCAN, "ret %d", ret);
1401 return ret;
1402 }
1403
1404 /**
1405 * @brief Scan Network
1406 *
1407 * @param dev A pointer to net_device structure
1408 * @param info A pointer to iw_request_info structure
1409 * @param vwrq A pointer to iw_param structure
1410 * @param extra A pointer to extra data buf
1411 *
1412 * @return 0 --success, otherwise fail
1413 */
1414 int libertas_set_scan(struct net_device *dev, struct iw_request_info *info,
1415 struct iw_param *vwrq, char *extra)
1416 {
1417 wlan_private *priv = dev->priv;
1418 wlan_adapter *adapter = priv->adapter;
1419
1420 lbs_deb_enter(LBS_DEB_SCAN);
1421
1422 wlan_scan_networks(priv, NULL, 0);
1423
1424 if (adapter->surpriseremoved)
1425 return -1;
1426
1427 lbs_deb_leave(LBS_DEB_SCAN);
1428 return 0;
1429 }
1430
1431 /**
1432 * @brief Send a scan command for all available channels filtered on a spec
1433 *
1434 * @param priv A pointer to wlan_private structure
1435 * @param prequestedssid A pointer to AP's ssid
1436 * @param keeppreviousscan Flag used to save/clear scan table before scan
1437 *
1438 * @return 0-success, otherwise fail
1439 */
1440 int libertas_send_specific_SSID_scan(wlan_private * priv,
1441 struct WLAN_802_11_SSID *prequestedssid,
1442 u8 clear_ssid)
1443 {
1444 wlan_adapter *adapter = priv->adapter;
1445 struct wlan_ioctl_user_scan_cfg scancfg;
1446 int ret = 0;
1447
1448 lbs_deb_enter(LBS_DEB_ASSOC);
1449
1450 if (prequestedssid == NULL)
1451 goto out;
1452
1453 memset(&scancfg, 0x00, sizeof(scancfg));
1454 memcpy(scancfg.ssid, prequestedssid->ssid, prequestedssid->ssidlength);
1455 scancfg.ssid_len = prequestedssid->ssidlength;
1456 scancfg.clear_ssid = clear_ssid;
1457
1458 wlan_scan_networks(priv, &scancfg, 1);
1459 if (adapter->surpriseremoved)
1460 return -1;
1461 wait_event_interruptible(adapter->cmd_pending, !adapter->nr_cmd_pending);
1462
1463 out:
1464 lbs_deb_leave(LBS_DEB_ASSOC);
1465 return ret;
1466 }
1467
1468 /**
1469 * @brief scan an AP with specific BSSID
1470 *
1471 * @param priv A pointer to wlan_private structure
1472 * @param bssid A pointer to AP's bssid
1473 * @param keeppreviousscan Flag used to save/clear scan table before scan
1474 *
1475 * @return 0-success, otherwise fail
1476 */
1477 int libertas_send_specific_BSSID_scan(wlan_private * priv, u8 * bssid, u8 clear_bssid)
1478 {
1479 struct wlan_ioctl_user_scan_cfg scancfg;
1480
1481 lbs_deb_enter(LBS_DEB_ASSOC);
1482
1483 if (bssid == NULL)
1484 goto out;
1485
1486 memset(&scancfg, 0x00, sizeof(scancfg));
1487 memcpy(scancfg.bssid, bssid, ETH_ALEN);
1488 scancfg.clear_bssid = clear_bssid;
1489
1490 wlan_scan_networks(priv, &scancfg, 1);
1491 if (priv->adapter->surpriseremoved)
1492 return -1;
1493 wait_event_interruptible(priv->adapter->cmd_pending,
1494 !priv->adapter->nr_cmd_pending);
1495
1496 out:
1497 lbs_deb_leave(LBS_DEB_ASSOC);
1498 return 0;
1499 }
1500
1501 static inline char *libertas_translate_scan(wlan_private *priv,
1502 char *start, char *stop,
1503 struct bss_descriptor *bss)
1504 {
1505 wlan_adapter *adapter = priv->adapter;
1506 struct chan_freq_power *cfp;
1507 char *current_val; /* For rates */
1508 struct iw_event iwe; /* Temporary buffer */
1509 int j;
1510 #define PERFECT_RSSI ((u8)50)
1511 #define WORST_RSSI ((u8)0)
1512 #define RSSI_DIFF ((u8)(PERFECT_RSSI - WORST_RSSI))
1513 u8 rssi;
1514
1515 cfp = libertas_find_cfp_by_band_and_channel(adapter, 0, bss->channel);
1516 if (!cfp) {
1517 lbs_deb_scan("Invalid channel number %d\n", bss->channel);
1518 return NULL;
1519 }
1520
1521 /* First entry *MUST* be the AP BSSID */
1522 iwe.cmd = SIOCGIWAP;
1523 iwe.u.ap_addr.sa_family = ARPHRD_ETHER;
1524 memcpy(iwe.u.ap_addr.sa_data, &bss->bssid, ETH_ALEN);
1525 start = iwe_stream_add_event(start, stop, &iwe, IW_EV_ADDR_LEN);
1526
1527 /* SSID */
1528 iwe.cmd = SIOCGIWESSID;
1529 iwe.u.data.flags = 1;
1530 iwe.u.data.length = min(bss->ssid.ssidlength, (u32) IW_ESSID_MAX_SIZE);
1531 start = iwe_stream_add_point(start, stop, &iwe, bss->ssid.ssid);
1532
1533 /* Mode */
1534 iwe.cmd = SIOCGIWMODE;
1535 iwe.u.mode = bss->mode;
1536 start = iwe_stream_add_event(start, stop, &iwe, IW_EV_UINT_LEN);
1537
1538 /* Frequency */
1539 iwe.cmd = SIOCGIWFREQ;
1540 iwe.u.freq.m = (long)cfp->freq * 100000;
1541 iwe.u.freq.e = 1;
1542 start = iwe_stream_add_event(start, stop, &iwe, IW_EV_FREQ_LEN);
1543
1544 /* Add quality statistics */
1545 iwe.cmd = IWEVQUAL;
1546 iwe.u.qual.updated = IW_QUAL_ALL_UPDATED;
1547 iwe.u.qual.level = SCAN_RSSI(bss->rssi);
1548
1549 rssi = iwe.u.qual.level - MRVDRV_NF_DEFAULT_SCAN_VALUE;
1550 iwe.u.qual.qual =
1551 (100 * RSSI_DIFF * RSSI_DIFF - (PERFECT_RSSI - rssi) *
1552 (15 * (RSSI_DIFF) + 62 * (PERFECT_RSSI - rssi))) /
1553 (RSSI_DIFF * RSSI_DIFF);
1554 if (iwe.u.qual.qual > 100)
1555 iwe.u.qual.qual = 100;
1556
1557 if (adapter->NF[TYPE_BEACON][TYPE_NOAVG] == 0) {
1558 iwe.u.qual.noise = MRVDRV_NF_DEFAULT_SCAN_VALUE;
1559 } else {
1560 iwe.u.qual.noise =
1561 CAL_NF(adapter->NF[TYPE_BEACON][TYPE_NOAVG]);
1562 }
1563
1564 /* Locally created ad-hoc BSSs won't have beacons if this is the
1565 * only station in the adhoc network; so get signal strength
1566 * from receive statistics.
1567 */
1568 if ((adapter->mode == IW_MODE_ADHOC)
1569 && adapter->adhoccreate
1570 && !libertas_SSID_cmp(&adapter->curbssparams.ssid, &bss->ssid)) {
1571 int snr, nf;
1572 snr = adapter->SNR[TYPE_RXPD][TYPE_AVG] / AVG_SCALE;
1573 nf = adapter->NF[TYPE_RXPD][TYPE_AVG] / AVG_SCALE;
1574 iwe.u.qual.level = CAL_RSSI(snr, nf);
1575 }
1576 start = iwe_stream_add_event(start, stop, &iwe, IW_EV_QUAL_LEN);
1577
1578 /* Add encryption capability */
1579 iwe.cmd = SIOCGIWENCODE;
1580 if (bss->privacy) {
1581 iwe.u.data.flags = IW_ENCODE_ENABLED | IW_ENCODE_NOKEY;
1582 } else {
1583 iwe.u.data.flags = IW_ENCODE_DISABLED;
1584 }
1585 iwe.u.data.length = 0;
1586 start = iwe_stream_add_point(start, stop, &iwe, bss->ssid.ssid);
1587
1588 current_val = start + IW_EV_LCP_LEN;
1589
1590 iwe.cmd = SIOCGIWRATE;
1591 iwe.u.bitrate.fixed = 0;
1592 iwe.u.bitrate.disabled = 0;
1593 iwe.u.bitrate.value = 0;
1594
1595 for (j = 0; j < sizeof(bss->libertas_supported_rates); j++) {
1596 u8 rate = bss->libertas_supported_rates[j];
1597 if (rate == 0)
1598 break; /* no more rates */
1599 /* Bit rate given in 500 kb/s units (+ 0x80) */
1600 iwe.u.bitrate.value = (rate & 0x7f) * 500000;
1601 current_val = iwe_stream_add_value(start, current_val,
1602 stop, &iwe, IW_EV_PARAM_LEN);
1603 }
1604 if ((bss->mode == IW_MODE_ADHOC)
1605 && !libertas_SSID_cmp(&adapter->curbssparams.ssid, &bss->ssid)
1606 && adapter->adhoccreate) {
1607 iwe.u.bitrate.value = 22 * 500000;
1608 current_val = iwe_stream_add_value(start, current_val,
1609 stop, &iwe, IW_EV_PARAM_LEN);
1610 }
1611 /* Check if we added any event */
1612 if((current_val - start) > IW_EV_LCP_LEN)
1613 start = current_val;
1614
1615 memset(&iwe, 0, sizeof(iwe));
1616 if (bss->wpa_ie_len) {
1617 char buf[MAX_WPA_IE_LEN];
1618 memcpy(buf, bss->wpa_ie, bss->wpa_ie_len);
1619 iwe.cmd = IWEVGENIE;
1620 iwe.u.data.length = bss->wpa_ie_len;
1621 start = iwe_stream_add_point(start, stop, &iwe, buf);
1622 }
1623
1624 memset(&iwe, 0, sizeof(iwe));
1625 if (bss->rsn_ie_len) {
1626 char buf[MAX_WPA_IE_LEN];
1627 memcpy(buf, bss->rsn_ie, bss->rsn_ie_len);
1628 iwe.cmd = IWEVGENIE;
1629 iwe.u.data.length = bss->rsn_ie_len;
1630 start = iwe_stream_add_point(start, stop, &iwe, buf);
1631 }
1632
1633 return start;
1634 }
1635
1636 /**
1637 * @brief Retrieve the scan table entries via wireless tools IOCTL call
1638 *
1639 * @param dev A pointer to net_device structure
1640 * @param info A pointer to iw_request_info structure
1641 * @param dwrq A pointer to iw_point structure
1642 * @param extra A pointer to extra data buf
1643 *
1644 * @return 0 --success, otherwise fail
1645 */
1646 int libertas_get_scan(struct net_device *dev, struct iw_request_info *info,
1647 struct iw_point *dwrq, char *extra)
1648 {
1649 #define SCAN_ITEM_SIZE 128
1650 wlan_private *priv = dev->priv;
1651 wlan_adapter *adapter = priv->adapter;
1652 int err = 0;
1653 char *ev = extra;
1654 char *stop = ev + dwrq->length;
1655 struct bss_descriptor * iter_bss;
1656 struct bss_descriptor * safe;
1657
1658 lbs_deb_enter(LBS_DEB_ASSOC);
1659
1660 /* If we've got an uncompleted scan, schedule the next part */
1661 if (!adapter->nr_cmd_pending && adapter->last_scanned_channel)
1662 wlan_scan_networks(priv, NULL, 0);
1663
1664 /* Update RSSI if current BSS is a locally created ad-hoc BSS */
1665 if ((adapter->mode == IW_MODE_ADHOC) && adapter->adhoccreate) {
1666 libertas_prepare_and_send_command(priv, cmd_802_11_rssi, 0,
1667 cmd_option_waitforrsp, 0, NULL);
1668 }
1669
1670 mutex_lock(&adapter->lock);
1671 list_for_each_entry_safe (iter_bss, safe, &adapter->network_list, list) {
1672 char * next_ev;
1673 unsigned long stale_time;
1674
1675 if (stop - ev < SCAN_ITEM_SIZE) {
1676 err = -E2BIG;
1677 break;
1678 }
1679
1680 /* Prune old an old scan result */
1681 stale_time = iter_bss->last_scanned + DEFAULT_MAX_SCAN_AGE;
1682 if (time_after(jiffies, stale_time)) {
1683 list_move_tail (&iter_bss->list,
1684 &adapter->network_free_list);
1685 clear_bss_descriptor(iter_bss);
1686 continue;
1687 }
1688
1689 /* Translate to WE format this entry */
1690 next_ev = libertas_translate_scan(priv, ev, stop, iter_bss);
1691 if (next_ev == NULL)
1692 continue;
1693 ev = next_ev;
1694 }
1695 mutex_unlock(&adapter->lock);
1696
1697 dwrq->length = (ev - extra);
1698 dwrq->flags = 0;
1699
1700 lbs_deb_leave(LBS_DEB_ASSOC);
1701 return err;
1702 }
1703
1704 /**
1705 * @brief Prepare a scan command to be sent to the firmware
1706 *
1707 * Use the wlan_scan_cmd_config sent to the command processing module in
1708 * the libertas_prepare_and_send_command to configure a cmd_ds_802_11_scan command
1709 * struct to send to firmware.
1710 *
1711 * The fixed fields specifying the BSS type and BSSID filters as well as a
1712 * variable number/length of TLVs are sent in the command to firmware.
1713 *
1714 * @param priv A pointer to wlan_private structure
1715 * @param cmd A pointer to cmd_ds_command structure to be sent to
1716 * firmware with the cmd_DS_801_11_SCAN structure
1717 * @param pdata_buf Void pointer cast of a wlan_scan_cmd_config struct used
1718 * to set the fields/TLVs for the command sent to firmware
1719 *
1720 * @return 0 or -1
1721 *
1722 * @sa wlan_scan_create_channel_list
1723 */
1724 int libertas_cmd_80211_scan(wlan_private * priv,
1725 struct cmd_ds_command *cmd, void *pdata_buf)
1726 {
1727 struct cmd_ds_802_11_scan *pscan = &cmd->params.scan;
1728 struct wlan_scan_cmd_config *pscancfg;
1729
1730 lbs_deb_enter(LBS_DEB_ASSOC);
1731
1732 pscancfg = pdata_buf;
1733
1734 /* Set fixed field variables in scan command */
1735 pscan->bsstype = pscancfg->bsstype;
1736 memcpy(pscan->BSSID, pscancfg->bssid, sizeof(pscan->BSSID));
1737 memcpy(pscan->tlvbuffer, pscancfg->tlvbuffer, pscancfg->tlvbufferlen);
1738
1739 cmd->command = cpu_to_le16(cmd_802_11_scan);
1740
1741 /* size is equal to the sizeof(fixed portions) + the TLV len + header */
1742 cmd->size = cpu_to_le16(sizeof(pscan->bsstype)
1743 + sizeof(pscan->BSSID)
1744 + pscancfg->tlvbufferlen + S_DS_GEN);
1745
1746 lbs_deb_scan("SCAN_CMD: command=%x, size=%x, seqnum=%x\n",
1747 cmd->command, cmd->size, cmd->seqnum);
1748
1749 lbs_deb_leave(LBS_DEB_ASSOC);
1750 return 0;
1751 }
1752
1753 static inline int is_same_network(struct bss_descriptor *src,
1754 struct bss_descriptor *dst)
1755 {
1756 /* A network is only a duplicate if the channel, BSSID, and ESSID
1757 * all match. We treat all <hidden> with the same BSSID and channel
1758 * as one network */
1759 return ((src->ssid.ssidlength == dst->ssid.ssidlength) &&
1760 (src->channel == dst->channel) &&
1761 !compare_ether_addr(src->bssid, dst->bssid) &&
1762 !memcmp(src->ssid.ssid, dst->ssid.ssid, src->ssid.ssidlength));
1763 }
1764
1765 /**
1766 * @brief This function handles the command response of scan
1767 *
1768 * The response buffer for the scan command has the following
1769 * memory layout:
1770 *
1771 * .-----------------------------------------------------------.
1772 * | header (4 * sizeof(u16)): Standard command response hdr |
1773 * .-----------------------------------------------------------.
1774 * | bufsize (u16) : sizeof the BSS Description data |
1775 * .-----------------------------------------------------------.
1776 * | NumOfSet (u8) : Number of BSS Descs returned |
1777 * .-----------------------------------------------------------.
1778 * | BSSDescription data (variable, size given in bufsize) |
1779 * .-----------------------------------------------------------.
1780 * | TLV data (variable, size calculated using header->size, |
1781 * | bufsize and sizeof the fixed fields above) |
1782 * .-----------------------------------------------------------.
1783 *
1784 * @param priv A pointer to wlan_private structure
1785 * @param resp A pointer to cmd_ds_command
1786 *
1787 * @return 0 or -1
1788 */
1789 int libertas_ret_80211_scan(wlan_private * priv, struct cmd_ds_command *resp)
1790 {
1791 wlan_adapter *adapter = priv->adapter;
1792 struct cmd_ds_802_11_scan_rsp *pscan;
1793 struct mrvlietypes_data *ptlv;
1794 struct mrvlietypes_tsftimestamp *ptsftlv;
1795 struct bss_descriptor * iter_bss;
1796 struct bss_descriptor * safe;
1797 u8 *pbssinfo;
1798 u16 scanrespsize;
1799 int bytesleft;
1800 int idx;
1801 int tlvbufsize;
1802 u64 tsfval;
1803 int ret;
1804
1805 lbs_deb_enter(LBS_DEB_ASSOC);
1806
1807 /* Prune old entries from scan table */
1808 list_for_each_entry_safe (iter_bss, safe, &adapter->network_list, list) {
1809 unsigned long stale_time = iter_bss->last_scanned + DEFAULT_MAX_SCAN_AGE;
1810 if (time_before(jiffies, stale_time))
1811 continue;
1812 list_move_tail (&iter_bss->list, &adapter->network_free_list);
1813 clear_bss_descriptor(iter_bss);
1814 }
1815
1816 pscan = &resp->params.scanresp;
1817
1818 if (pscan->nr_sets > MAX_NETWORK_COUNT) {
1819 lbs_deb_scan(
1820 "SCAN_RESP: too many scan results (%d, max %d)!!\n",
1821 pscan->nr_sets, MAX_NETWORK_COUNT);
1822 ret = -1;
1823 goto done;
1824 }
1825
1826 bytesleft = le16_to_cpu(pscan->bssdescriptsize);
1827 lbs_deb_scan("SCAN_RESP: bssdescriptsize %d\n", bytesleft);
1828
1829 scanrespsize = le16_to_cpu(resp->size);
1830 lbs_deb_scan("SCAN_RESP: returned %d AP before parsing\n",
1831 pscan->nr_sets);
1832
1833 pbssinfo = pscan->bssdesc_and_tlvbuffer;
1834
1835 /* The size of the TLV buffer is equal to the entire command response
1836 * size (scanrespsize) minus the fixed fields (sizeof()'s), the
1837 * BSS Descriptions (bssdescriptsize as bytesLef) and the command
1838 * response header (S_DS_GEN)
1839 */
1840 tlvbufsize = scanrespsize - (bytesleft + sizeof(pscan->bssdescriptsize)
1841 + sizeof(pscan->nr_sets)
1842 + S_DS_GEN);
1843
1844 ptlv = (struct mrvlietypes_data *) (pscan->bssdesc_and_tlvbuffer + bytesleft);
1845
1846 /* Search the TLV buffer space in the scan response for any valid TLVs */
1847 wlan_ret_802_11_scan_get_tlv_ptrs(ptlv, tlvbufsize, &ptsftlv);
1848
1849 /*
1850 * Process each scan response returned (pscan->nr_sets). Save
1851 * the information in the newbssentry and then insert into the
1852 * driver scan table either as an update to an existing entry
1853 * or as an addition at the end of the table
1854 */
1855 for (idx = 0; idx < pscan->nr_sets && bytesleft; idx++) {
1856 struct bss_descriptor new;
1857 struct bss_descriptor * found = NULL;
1858 struct bss_descriptor * oldest = NULL;
1859
1860 /* Process the data fields and IEs returned for this BSS */
1861 memset(&new, 0, sizeof (struct bss_descriptor));
1862 if (libertas_process_bss(&new, &pbssinfo, &bytesleft) != 0) {
1863 /* error parsing the scan response, skipped */
1864 lbs_deb_scan("SCAN_RESP: process_bss returned ERROR\n");
1865 continue;
1866 }
1867
1868 /* Try to find this bss in the scan table */
1869 list_for_each_entry (iter_bss, &adapter->network_list, list) {
1870 if (is_same_network(iter_bss, &new)) {
1871 found = iter_bss;
1872 break;
1873 }
1874
1875 if ((oldest == NULL) ||
1876 (iter_bss->last_scanned < oldest->last_scanned))
1877 oldest = iter_bss;
1878 }
1879
1880 if (found) {
1881 /* found, clear it */
1882 clear_bss_descriptor(found);
1883 } else if (!list_empty(&adapter->network_free_list)) {
1884 /* Pull one from the free list */
1885 found = list_entry(adapter->network_free_list.next,
1886 struct bss_descriptor, list);
1887 list_move_tail(&found->list, &adapter->network_list);
1888 } else if (oldest) {
1889 /* If there are no more slots, expire the oldest */
1890 found = oldest;
1891 clear_bss_descriptor(found);
1892 list_move_tail(&found->list, &adapter->network_list);
1893 } else {
1894 continue;
1895 }
1896
1897 lbs_deb_scan("SCAN_RESP: BSSID = " MAC_FMT "\n",
1898 new.bssid[0], new.bssid[1], new.bssid[2],
1899 new.bssid[3], new.bssid[4], new.bssid[5]);
1900
1901 /*
1902 * If the TSF TLV was appended to the scan results, save the
1903 * this entries TSF value in the networktsf field. The
1904 * networktsf is the firmware's TSF value at the time the
1905 * beacon or probe response was received.
1906 */
1907 if (ptsftlv) {
1908 memcpy(&tsfval, &ptsftlv->tsftable[idx], sizeof(tsfval));
1909 tsfval = le64_to_cpu(tsfval);
1910 memcpy(&new.networktsf, &tsfval, sizeof(new.networktsf));
1911 }
1912
1913 /* Copy the locally created newbssentry to the scan table */
1914 memcpy(found, &new, offsetof(struct bss_descriptor, list));
1915 }
1916
1917 ret = 0;
1918
1919 done:
1920 lbs_deb_leave_args(LBS_DEB_SCAN, "ret %d", ret);
1921 return ret;
1922 }
Linux kernel - Deliverables
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