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allow coexistance of N build and AC build.
[tomato.git] / release / src-rt-6.x / linux / linux-2.6 / drivers / net / wireless / libertas / scan.c
blobc3043dcb541ea0c1cb129f0b1a8d9988ebf56cc2
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 Create a channel list for the driver to scan based on region info
219 *
220 * Use the driver region/band information to construct a comprehensive list
221 * of channels to scan. This routine is used for any scan that is not
222 * provided a specific channel list to scan.
223 *
224 * @param priv A pointer to wlan_private structure
225 * @param scanchanlist Output parameter: resulting channel list to scan
226 * @param filteredscan Flag indicating whether or not a BSSID or SSID filter
227 * is being sent in the command to firmware. Used to
228 * increase the number of channels sent in a scan
229 * command and to disable the firmware channel scan
230 * filter.
231 *
232 * @return void
233 */
234 static void wlan_scan_create_channel_list(wlan_private * priv,
235 struct chanscanparamset * scanchanlist,
236 u8 filteredscan)
237 {
238
239 wlan_adapter *adapter = priv->adapter;
240 struct region_channel *scanregion;
241 struct chan_freq_power *cfp;
242 int rgnidx;
243 int chanidx;
244 int nextchan;
245 u8 scantype;
246
247 chanidx = 0;
248
249 /* Set the default scan type to the user specified type, will later
250 * be changed to passive on a per channel basis if restricted by
251 * regulatory requirements (11d or 11h)
252 */
253 scantype = adapter->scantype;
254
255 for (rgnidx = 0; rgnidx < ARRAY_SIZE(adapter->region_channel); rgnidx++) {
256 if (priv->adapter->enable11d &&
257 adapter->connect_status != libertas_connected) {
258 /* Scan all the supported chan for the first scan */
259 if (!adapter->universal_channel[rgnidx].valid)
260 continue;
261 scanregion = &adapter->universal_channel[rgnidx];
262
263 /* clear the parsed_region_chan for the first scan */
264 memset(&adapter->parsed_region_chan, 0x00,
265 sizeof(adapter->parsed_region_chan));
266 } else {
267 if (!adapter->region_channel[rgnidx].valid)
268 continue;
269 scanregion = &adapter->region_channel[rgnidx];
270 }
271
272 for (nextchan = 0;
273 nextchan < scanregion->nrcfp; nextchan++, chanidx++) {
274
275 cfp = scanregion->CFP + nextchan;
276
277 if (priv->adapter->enable11d) {
278 scantype =
279 libertas_get_scan_type_11d(cfp->channel,
280 &adapter->
281 parsed_region_chan);
282 }
283
284 switch (scanregion->band) {
285 case BAND_B:
286 case BAND_G:
287 default:
288 scanchanlist[chanidx].radiotype =
289 cmd_scan_radio_type_bg;
290 break;
291 }
292
293 if (scantype == cmd_scan_type_passive) {
294 scanchanlist[chanidx].maxscantime =
295 cpu_to_le16(MRVDRV_PASSIVE_SCAN_CHAN_TIME);
296 scanchanlist[chanidx].chanscanmode.passivescan =
297 1;
298 } else {
299 scanchanlist[chanidx].maxscantime =
300 cpu_to_le16(MRVDRV_ACTIVE_SCAN_CHAN_TIME);
301 scanchanlist[chanidx].chanscanmode.passivescan =
302 0;
303 }
304
305 scanchanlist[chanidx].channumber = cfp->channel;
306
307 if (filteredscan) {
308 scanchanlist[chanidx].chanscanmode.
309 disablechanfilt = 1;
310 }
311 }
312 }
313 }
314
315 /**
316 * @brief Construct a wlan_scan_cmd_config structure to use in issue scan cmds
317 *
318 * Application layer or other functions can invoke wlan_scan_networks
319 * with a scan configuration supplied in a wlan_ioctl_user_scan_cfg struct.
320 * This structure is used as the basis of one or many wlan_scan_cmd_config
321 * commands that are sent to the command processing module and sent to
322 * firmware.
323 *
324 * Create a wlan_scan_cmd_config based on the following user supplied
325 * parameters (if present):
326 * - SSID filter
327 * - BSSID filter
328 * - Number of Probes to be sent
329 * - channel list
330 *
331 * If the SSID or BSSID filter is not present, disable/clear the filter.
332 * If the number of probes is not set, use the adapter default setting
333 * Qualify the channel
334 *
335 * @param priv A pointer to wlan_private structure
336 * @param puserscanin NULL or pointer to scan configuration parameters
337 * @param ppchantlvout Output parameter: Pointer to the start of the
338 * channel TLV portion of the output scan config
339 * @param pscanchanlist Output parameter: Pointer to the resulting channel
340 * list to scan
341 * @param pmaxchanperscan Output parameter: Number of channels to scan for
342 * each issuance of the firmware scan command
343 * @param pfilteredscan Output parameter: Flag indicating whether or not
344 * a BSSID or SSID filter is being sent in the
345 * command to firmware. Used to increase the number
346 * of channels sent in a scan command and to
347 * disable the firmware channel scan filter.
348 * @param pscancurrentonly Output parameter: Flag indicating whether or not
349 * we are only scanning our current active channel
350 *
351 * @return resulting scan configuration
352 */
353 static struct wlan_scan_cmd_config *
354 wlan_scan_setup_scan_config(wlan_private * priv,
355 const struct wlan_ioctl_user_scan_cfg * puserscanin,
356 struct mrvlietypes_chanlistparamset ** ppchantlvout,
357 struct chanscanparamset * pscanchanlist,
358 int *pmaxchanperscan,
359 u8 * pfilteredscan,
360 u8 * pscancurrentonly)
361 {
362 wlan_adapter *adapter = priv->adapter;
363 struct mrvlietypes_numprobes *pnumprobestlv;
364 struct mrvlietypes_ssidparamset *pssidtlv;
365 struct wlan_scan_cmd_config * pscancfgout = NULL;
366 u8 *ptlvpos;
367 u16 numprobes;
368 int chanidx;
369 int scantype;
370 int scandur;
371 int channel;
372 int radiotype;
373
374 pscancfgout = kzalloc(MAX_SCAN_CFG_ALLOC, GFP_KERNEL);
375 if (pscancfgout == NULL)
376 goto out;
377
378 /* The tlvbufferlen is calculated for each scan command. The TLVs added
379 * in this routine will be preserved since the routine that sends
380 * the command will append channelTLVs at *ppchantlvout. The difference
381 * between the *ppchantlvout and the tlvbuffer start will be used
382 * to calculate the size of anything we add in this routine.
383 */
384 pscancfgout->tlvbufferlen = 0;
385
386 /* Running tlv pointer. Assigned to ppchantlvout at end of function
387 * so later routines know where channels can be added to the command buf
388 */
389 ptlvpos = pscancfgout->tlvbuffer;
390
391 /*
392 * Set the initial scan paramters for progressive scanning. If a specific
393 * BSSID or SSID is used, the number of channels in the scan command
394 * will be increased to the absolute maximum
395 */
396 *pmaxchanperscan = MRVDRV_CHANNELS_PER_SCAN_CMD;
397
398 /* Initialize the scan as un-filtered by firmware, set to TRUE below if
399 * a SSID or BSSID filter is sent in the command
400 */
401 *pfilteredscan = 0;
402
403 /* Initialize the scan as not being only on the current channel. If
404 * the channel list is customized, only contains one channel, and
405 * is the active channel, this is set true and data flow is not halted.
406 */
407 *pscancurrentonly = 0;
408
409 if (puserscanin) {
410
411 /* Set the bss type scan filter, use adapter setting if unset */
412 pscancfgout->bsstype =
413 (puserscanin->bsstype ? puserscanin->bsstype : adapter->
414 scanmode);
415
416 /* Set the number of probes to send, use adapter setting if unset */
417 numprobes = (puserscanin->numprobes ? puserscanin->numprobes :
418 adapter->scanprobes);
419
420 /*
421 * Set the BSSID filter to the incoming configuration,
422 * if non-zero. If not set, it will remain disabled (all zeros).
423 */
424 memcpy(pscancfgout->bssid, puserscanin->bssid,
425 sizeof(pscancfgout->bssid));
426
427 if (puserscanin->ssid_len) {
428 pssidtlv =
429 (struct mrvlietypes_ssidparamset *) pscancfgout->
430 tlvbuffer;
431 pssidtlv->header.type = cpu_to_le16(TLV_TYPE_SSID);
432 pssidtlv->header.len = cpu_to_le16(puserscanin->ssid_len);
433 memcpy(pssidtlv->ssid, puserscanin->ssid,
434 puserscanin->ssid_len);
435 ptlvpos += sizeof(pssidtlv->header) + puserscanin->ssid_len;
436 }
437
438 /*
439 * The default number of channels sent in the command is low to
440 * ensure the response buffer from the firmware does not truncate
441 * scan results. That is not an issue with an SSID or BSSID
442 * filter applied to the scan results in the firmware.
443 */
444 if ( puserscanin->ssid_len
445 || (compare_ether_addr(pscancfgout->bssid, &zeromac[0]) != 0)) {
446 *pmaxchanperscan = MRVDRV_MAX_CHANNELS_PER_SCAN;
447 *pfilteredscan = 1;
448 }
449 } else {
450 pscancfgout->bsstype = adapter->scanmode;
451 numprobes = adapter->scanprobes;
452 }
453
454 /* If the input config or adapter has the number of Probes set, add tlv */
455 if (numprobes) {
456 pnumprobestlv = (struct mrvlietypes_numprobes *) ptlvpos;
457 pnumprobestlv->header.type = cpu_to_le16(TLV_TYPE_NUMPROBES);
458 pnumprobestlv->header.len = cpu_to_le16(2);
459 pnumprobestlv->numprobes = cpu_to_le16(numprobes);
460
461 ptlvpos += sizeof(*pnumprobestlv);
462 }
463
464 /*
465 * Set the output for the channel TLV to the address in the tlv buffer
466 * past any TLVs that were added in this fuction (SSID, numprobes).
467 * channel TLVs will be added past this for each scan command, preserving
468 * the TLVs that were previously added.
469 */
470 *ppchantlvout = (struct mrvlietypes_chanlistparamset *) ptlvpos;
471
472 if (puserscanin && puserscanin->chanlist[0].channumber) {
473
474 lbs_deb_scan("Scan: Using supplied channel list\n");
475
476 for (chanidx = 0;
477 chanidx < WLAN_IOCTL_USER_SCAN_CHAN_MAX
478 && puserscanin->chanlist[chanidx].channumber; chanidx++) {
479
480 channel = puserscanin->chanlist[chanidx].channumber;
481 (pscanchanlist + chanidx)->channumber = channel;
482
483 radiotype = puserscanin->chanlist[chanidx].radiotype;
484 (pscanchanlist + chanidx)->radiotype = radiotype;
485
486 scantype = puserscanin->chanlist[chanidx].scantype;
487
488 if (scantype == cmd_scan_type_passive) {
489 (pscanchanlist +
490 chanidx)->chanscanmode.passivescan = 1;
491 } else {
492 (pscanchanlist +
493 chanidx)->chanscanmode.passivescan = 0;
494 }
495
496 if (puserscanin->chanlist[chanidx].scantime) {
497 scandur =
498 puserscanin->chanlist[chanidx].scantime;
499 } else {
500 if (scantype == cmd_scan_type_passive) {
501 scandur = MRVDRV_PASSIVE_SCAN_CHAN_TIME;
502 } else {
503 scandur = MRVDRV_ACTIVE_SCAN_CHAN_TIME;
504 }
505 }
506
507 (pscanchanlist + chanidx)->minscantime =
508 cpu_to_le16(scandur);
509 (pscanchanlist + chanidx)->maxscantime =
510 cpu_to_le16(scandur);
511 }
512
513 /* Check if we are only scanning the current channel */
514 if ((chanidx == 1) && (puserscanin->chanlist[0].channumber
515 ==
516 priv->adapter->curbssparams.channel)) {
517 *pscancurrentonly = 1;
518 lbs_deb_scan("Scan: Scanning current channel only");
519 }
520
521 } else {
522 lbs_deb_scan("Scan: Creating full region channel list\n");
523 wlan_scan_create_channel_list(priv, pscanchanlist,
524 *pfilteredscan);
525 }
526
527 out:
528 return pscancfgout;
529 }
530
531 /**
532 * @brief Construct and send multiple scan config commands to the firmware
533 *
534 * Previous routines have created a wlan_scan_cmd_config with any requested
535 * TLVs. This function splits the channel TLV into maxchanperscan lists
536 * and sends the portion of the channel TLV along with the other TLVs
537 * to the wlan_cmd routines for execution in the firmware.
538 *
539 * @param priv A pointer to wlan_private structure
540 * @param maxchanperscan Maximum number channels to be included in each
541 * scan command sent to firmware
542 * @param filteredscan Flag indicating whether or not a BSSID or SSID
543 * filter is being used for the firmware command
544 * scan command sent to firmware
545 * @param pscancfgout Scan configuration used for this scan.
546 * @param pchantlvout Pointer in the pscancfgout where the channel TLV
547 * should start. This is past any other TLVs that
548 * must be sent down in each firmware command.
549 * @param pscanchanlist List of channels to scan in maxchanperscan segments
550 *
551 * @return 0 or error return otherwise
552 */
553 static int wlan_scan_channel_list(wlan_private * priv,
554 int maxchanperscan,
555 u8 filteredscan,
556 struct wlan_scan_cmd_config * pscancfgout,
557 struct mrvlietypes_chanlistparamset * pchantlvout,
558 struct chanscanparamset * pscanchanlist,
559 const struct wlan_ioctl_user_scan_cfg * puserscanin,
560 int full_scan)
561 {
562 struct chanscanparamset *ptmpchan;
563 struct chanscanparamset *pstartchan;
564 u8 scanband;
565 int doneearly;
566 int tlvidx;
567 int ret = 0;
568 int scanned = 0;
569 union iwreq_data wrqu;
570
571 lbs_deb_enter(LBS_DEB_ASSOC);
572
573 if (pscancfgout == 0 || pchantlvout == 0 || pscanchanlist == 0) {
574 lbs_deb_scan("Scan: Null detect: %p, %p, %p\n",
575 pscancfgout, pchantlvout, pscanchanlist);
576 return -1;
577 }
578
579 pchantlvout->header.type = cpu_to_le16(TLV_TYPE_CHANLIST);
580
581 /* Set the temp channel struct pointer to the start of the desired list */
582 ptmpchan = pscanchanlist;
583
584 if (priv->adapter->last_scanned_channel && !puserscanin)
585 ptmpchan += priv->adapter->last_scanned_channel;
586
587 /* Loop through the desired channel list, sending a new firmware scan
588 * commands for each maxchanperscan channels (or for 1,6,11 individually
589 * if configured accordingly)
590 */
591 while (ptmpchan->channumber) {
592
593 tlvidx = 0;
594 pchantlvout->header.len = 0;
595 scanband = ptmpchan->radiotype;
596 pstartchan = ptmpchan;
597 doneearly = 0;
598
599 /* Construct the channel TLV for the scan command. Continue to
600 * insert channel TLVs until:
601 * - the tlvidx hits the maximum configured per scan command
602 * - the next channel to insert is 0 (end of desired channel list)
603 * - doneearly is set (controlling individual scanning of 1,6,11)
604 */
605 while (tlvidx < maxchanperscan && ptmpchan->channumber
606 && !doneearly && scanned < 2) {
607
608 lbs_deb_scan(
609 "Scan: Chan(%3d), Radio(%d), mode(%d,%d), Dur(%d)\n",
610 ptmpchan->channumber, ptmpchan->radiotype,
611 ptmpchan->chanscanmode.passivescan,
612 ptmpchan->chanscanmode.disablechanfilt,
613 ptmpchan->maxscantime);
614
615 /* Copy the current channel TLV to the command being prepared */
616 memcpy(pchantlvout->chanscanparam + tlvidx,
617 ptmpchan, sizeof(pchantlvout->chanscanparam));
618
619 /* Increment the TLV header length by the size appended */
620 /* Ew, it would be _so_ nice if we could just declare the
621 variable little-endian and let GCC handle it for us */
622 pchantlvout->header.len =
623 cpu_to_le16(le16_to_cpu(pchantlvout->header.len) +
624 sizeof(pchantlvout->chanscanparam));
625
626 /*
627 * The tlv buffer length is set to the number of bytes of the
628 * between the channel tlv pointer and the start of the
629 * tlv buffer. This compensates for any TLVs that were appended
630 * before the channel list.
631 */
632 pscancfgout->tlvbufferlen = ((u8 *) pchantlvout
633 - pscancfgout->tlvbuffer);
634
635 /* Add the size of the channel tlv header and the data length */
636 pscancfgout->tlvbufferlen +=
637 (sizeof(pchantlvout->header)
638 + le16_to_cpu(pchantlvout->header.len));
639
640 /* Increment the index to the channel tlv we are constructing */
641 tlvidx++;
642
643 doneearly = 0;
644
645 /* Stop the loop if the *current* channel is in the 1,6,11 set
646 * and we are not filtering on a BSSID or SSID.
647 */
648 if (!filteredscan && (ptmpchan->channumber == 1
649 || ptmpchan->channumber == 6
650 || ptmpchan->channumber == 11)) {
651 doneearly = 1;
652 }
653
654 /* Increment the tmp pointer to the next channel to be scanned */
655 ptmpchan++;
656 scanned++;
657
658 /* Stop the loop if the *next* channel is in the 1,6,11 set.
659 * This will cause it to be the only channel scanned on the next
660 * interation
661 */
662 if (!filteredscan && (ptmpchan->channumber == 1
663 || ptmpchan->channumber == 6
664 || ptmpchan->channumber == 11)) {
665 doneearly = 1;
666 }
667 }
668
669 /* Send the scan command to the firmware with the specified cfg */
670 ret = libertas_prepare_and_send_command(priv, cmd_802_11_scan, 0,
671 0, 0, pscancfgout);
672 if (scanned >= 2 && !full_scan) {
673 ret = 0;
674 goto done;
675 }
676 scanned = 0;
677 }
678
679 done:
680 priv->adapter->last_scanned_channel = ptmpchan->channumber;
681
682 /* Tell userspace the scan table has been updated */
683 memset(&wrqu, 0, sizeof(union iwreq_data));
684 wireless_send_event(priv->dev, SIOCGIWSCAN, &wrqu, NULL);
685
686 lbs_deb_leave_args(LBS_DEB_SCAN, "ret %d", ret);
687 return ret;
688 }
689
690 static void
691 clear_selected_scan_list_entries(wlan_adapter * adapter,
692 const struct wlan_ioctl_user_scan_cfg * scan_cfg)
693 {
694 struct bss_descriptor * bss;
695 struct bss_descriptor * safe;
696 u32 clear_ssid_flag = 0, clear_bssid_flag = 0;
697
698 if (!scan_cfg)
699 return;
700
701 if (scan_cfg->clear_ssid && scan_cfg->ssid_len)
702 clear_ssid_flag = 1;
703
704 if (scan_cfg->clear_bssid
705 && (compare_ether_addr(scan_cfg->bssid, &zeromac[0]) != 0)
706 && (compare_ether_addr(scan_cfg->bssid, &bcastmac[0]) != 0)) {
707 clear_bssid_flag = 1;
708 }
709
710 if (!clear_ssid_flag && !clear_bssid_flag)
711 return;
712
713 mutex_lock(&adapter->lock);
714 list_for_each_entry_safe (bss, safe, &adapter->network_list, list) {
715 u32 clear = 0;
716
717 /* Check for an SSID match */
718 if ( clear_ssid_flag
719 && (bss->ssid_len == scan_cfg->ssid_len)
720 && !memcmp(bss->ssid, scan_cfg->ssid, bss->ssid_len))
721 clear = 1;
722
723 /* Check for a BSSID match */
724 if ( clear_bssid_flag
725 && !compare_ether_addr(bss->bssid, scan_cfg->bssid))
726 clear = 1;
727
728 if (clear) {
729 list_move_tail (&bss->list, &adapter->network_free_list);
730 clear_bss_descriptor(bss);
731 }
732 }
733 mutex_unlock(&adapter->lock);
734 }
735
736
737 /**
738 * @brief Internal function used to start a scan based on an input config
739 *
740 * Use the input user scan configuration information when provided in
741 * order to send the appropriate scan commands to firmware to populate or
742 * update the internal driver scan table
743 *
744 * @param priv A pointer to wlan_private structure
745 * @param puserscanin Pointer to the input configuration for the requested
746 * scan.
747 *
748 * @return 0 or < 0 if error
749 */
750 int wlan_scan_networks(wlan_private * priv,
751 const struct wlan_ioctl_user_scan_cfg * puserscanin,
752 int full_scan)
753 {
754 wlan_adapter * adapter = priv->adapter;
755 struct mrvlietypes_chanlistparamset *pchantlvout;
756 struct chanscanparamset * scan_chan_list = NULL;
757 struct wlan_scan_cmd_config * scan_cfg = NULL;
758 u8 filteredscan;
759 u8 scancurrentchanonly;
760 int maxchanperscan;
761 int ret;
762 #ifdef CONFIG_LIBERTAS_DEBUG
763 struct bss_descriptor * iter_bss;
764 int i = 0;
765 #endif
766
767 lbs_deb_enter(LBS_DEB_ASSOC);
768
769 scan_chan_list = kzalloc(sizeof(struct chanscanparamset) *
770 WLAN_IOCTL_USER_SCAN_CHAN_MAX, GFP_KERNEL);
771 if (scan_chan_list == NULL) {
772 ret = -ENOMEM;
773 goto out;
774 }
775
776 scan_cfg = wlan_scan_setup_scan_config(priv,
777 puserscanin,
778 &pchantlvout,
779 scan_chan_list,
780 &maxchanperscan,
781 &filteredscan,
782 &scancurrentchanonly);
783 if (scan_cfg == NULL) {
784 ret = -ENOMEM;
785 goto out;
786 }
787
788 clear_selected_scan_list_entries(adapter, puserscanin);
789
790 /* Keep the data path active if we are only scanning our current channel */
791 if (!scancurrentchanonly) {
792 netif_stop_queue(priv->dev);
793 netif_carrier_off(priv->dev);
794 netif_stop_queue(priv->mesh_dev);
795 netif_carrier_off(priv->mesh_dev);
796 }
797
798 ret = wlan_scan_channel_list(priv,
799 maxchanperscan,
800 filteredscan,
801 scan_cfg,
802 pchantlvout,
803 scan_chan_list,
804 puserscanin,
805 full_scan);
806
807 #ifdef CONFIG_LIBERTAS_DEBUG
808 /* Dump the scan table */
809 mutex_lock(&adapter->lock);
810 list_for_each_entry (iter_bss, &adapter->network_list, list) {
811 lbs_deb_scan("Scan:(%02d) " MAC_FMT ", RSSI[%03d], SSID[%s]\n",
812 i++, MAC_ARG(iter_bss->bssid), (s32) iter_bss->rssi,
813 escape_essid(iter_bss->ssid, iter_bss->ssid_len));
814 }
815 mutex_unlock(&adapter->lock);
816 #endif
817
818 if (priv->adapter->connect_status == libertas_connected) {
819 netif_carrier_on(priv->dev);
820 netif_wake_queue(priv->dev);
821 netif_carrier_on(priv->mesh_dev);
822 netif_wake_queue(priv->mesh_dev);
823 }
824
825 out:
826 if (scan_cfg)
827 kfree(scan_cfg);
828
829 if (scan_chan_list)
830 kfree(scan_chan_list);
831
832 lbs_deb_leave_args(LBS_DEB_SCAN, "ret %d", ret);
833 return ret;
834 }
835
836 /**
837 * @brief Inspect the scan response buffer for pointers to expected TLVs
838 *
839 * TLVs can be included at the end of the scan response BSS information.
840 * Parse the data in the buffer for pointers to TLVs that can potentially
841 * be passed back in the response
842 *
843 * @param ptlv Pointer to the start of the TLV buffer to parse
844 * @param tlvbufsize size of the TLV buffer
845 * @param ptsftlv Output parameter: Pointer to the TSF TLV if found
846 *
847 * @return void
848 */
849 static
850 void wlan_ret_802_11_scan_get_tlv_ptrs(struct mrvlietypes_data * ptlv,
851 int tlvbufsize,
852 struct mrvlietypes_tsftimestamp ** ptsftlv)
853 {
854 struct mrvlietypes_data *pcurrenttlv;
855 int tlvbufleft;
856 u16 tlvtype;
857 u16 tlvlen;
858
859 pcurrenttlv = ptlv;
860 tlvbufleft = tlvbufsize;
861 *ptsftlv = NULL;
862
863 lbs_deb_scan("SCAN_RESP: tlvbufsize = %d\n", tlvbufsize);
864 lbs_dbg_hex("SCAN_RESP: TLV Buf", (u8 *) ptlv, tlvbufsize);
865
866 while (tlvbufleft >= sizeof(struct mrvlietypesheader)) {
867 tlvtype = le16_to_cpu(pcurrenttlv->header.type);
868 tlvlen = le16_to_cpu(pcurrenttlv->header.len);
869
870 switch (tlvtype) {
871 case TLV_TYPE_TSFTIMESTAMP:
872 *ptsftlv = (struct mrvlietypes_tsftimestamp *) pcurrenttlv;
873 break;
874
875 default:
876 lbs_deb_scan("SCAN_RESP: Unhandled TLV = %d\n",
877 tlvtype);
878 /* Give up, this seems corrupted */
879 return;
880 } /* switch */
881
882 tlvbufleft -= (sizeof(ptlv->header) + tlvlen);
883 pcurrenttlv =
884 (struct mrvlietypes_data *) (pcurrenttlv->Data + tlvlen);
885 } /* while */
886 }
887
888 /**
889 * @brief Interpret a BSS scan response returned from the firmware
890 *
891 * Parse the various fixed fields and IEs passed back for a a BSS probe
892 * response or beacon from the scan command. Record information as needed
893 * in the scan table struct bss_descriptor for that entry.
894 *
895 * @param bss Output parameter: Pointer to the BSS Entry
896 *
897 * @return 0 or -1
898 */
899 static int libertas_process_bss(struct bss_descriptor * bss,
900 u8 ** pbeaconinfo, int *bytesleft)
901 {
902 enum ieeetypes_elementid elemID;
903 struct ieeetypes_fhparamset *pFH;
904 struct ieeetypes_dsparamset *pDS;
905 struct ieeetypes_cfparamset *pCF;
906 struct ieeetypes_ibssparamset *pibss;
907 struct ieeetypes_capinfo *pcap;
908 struct WLAN_802_11_FIXED_IEs fixedie;
909 u8 *pcurrentptr;
910 u8 *pRate;
911 u8 elemlen;
912 u8 bytestocopy;
913 u8 ratesize;
914 u16 beaconsize;
915 u8 founddatarateie;
916 int bytesleftforcurrentbeacon;
917 int ret;
918
919 struct IE_WPA *pIe;
920 const u8 oui01[4] = { 0x00, 0x50, 0xf2, 0x01 };
921
922 struct ieeetypes_countryinfoset *pcountryinfo;
923
924 lbs_deb_enter(LBS_DEB_ASSOC);
925
926 founddatarateie = 0;
927 ratesize = 0;
928 beaconsize = 0;
929
930 if (*bytesleft >= sizeof(beaconsize)) {
931 /* Extract & convert beacon size from the command buffer */
932 beaconsize = le16_to_cpup((void *)*pbeaconinfo);
933 *bytesleft -= sizeof(beaconsize);
934 *pbeaconinfo += sizeof(beaconsize);
935 }
936
937 if (beaconsize == 0 || beaconsize > *bytesleft) {
938
939 *pbeaconinfo += *bytesleft;
940 *bytesleft = 0;
941
942 return -1;
943 }
944
945 /* Initialize the current working beacon pointer for this BSS iteration */
946 pcurrentptr = *pbeaconinfo;
947
948 /* Advance the return beacon pointer past the current beacon */
949 *pbeaconinfo += beaconsize;
950 *bytesleft -= beaconsize;
951
952 bytesleftforcurrentbeacon = beaconsize;
953
954 memcpy(bss->bssid, pcurrentptr, ETH_ALEN);
955 lbs_deb_scan("process_bss: AP BSSID " MAC_FMT "\n", MAC_ARG(bss->bssid));
956
957 pcurrentptr += ETH_ALEN;
958 bytesleftforcurrentbeacon -= ETH_ALEN;
959
960 if (bytesleftforcurrentbeacon < 12) {
961 lbs_deb_scan("process_bss: Not enough bytes left\n");
962 return -1;
963 }
964
965 /*
966 * next 4 fields are RSSI, time stamp, beacon interval,
967 * and capability information
968 */
969
970 /* RSSI is 1 byte long */
971 bss->rssi = *pcurrentptr;
972 lbs_deb_scan("process_bss: RSSI=%02X\n", *pcurrentptr);
973 pcurrentptr += 1;
974 bytesleftforcurrentbeacon -= 1;
975
976 /* time stamp is 8 bytes long */
977 fixedie.timestamp = bss->timestamp = le64_to_cpup((void *)pcurrentptr);
978 pcurrentptr += 8;
979 bytesleftforcurrentbeacon -= 8;
980
981 /* beacon interval is 2 bytes long */
982 fixedie.beaconinterval = bss->beaconperiod = le16_to_cpup((void *)pcurrentptr);
983 pcurrentptr += 2;
984 bytesleftforcurrentbeacon -= 2;
985
986 /* capability information is 2 bytes long */
987 memcpy(&fixedie.capabilities, pcurrentptr, 2);
988 lbs_deb_scan("process_bss: fixedie.capabilities=0x%X\n",
989 fixedie.capabilities);
990 pcap = (struct ieeetypes_capinfo *) & fixedie.capabilities;
991 memcpy(&bss->cap, pcap, sizeof(struct ieeetypes_capinfo));
992 pcurrentptr += 2;
993 bytesleftforcurrentbeacon -= 2;
994
995 /* rest of the current buffer are IE's */
996 lbs_deb_scan("process_bss: IE length for this AP = %d\n",
997 bytesleftforcurrentbeacon);
998
999 lbs_dbg_hex("process_bss: IE info", (u8 *) pcurrentptr,
1000 bytesleftforcurrentbeacon);
1001
1002 if (pcap->privacy) {
1003 lbs_deb_scan("process_bss: AP WEP enabled\n");
1004 bss->privacy = wlan802_11privfilter8021xWEP;
1005 } else {
1006 bss->privacy = wlan802_11privfilteracceptall;
1007 }
1008
1009 if (pcap->ibss == 1) {
1010 bss->mode = IW_MODE_ADHOC;
1011 } else {
1012 bss->mode = IW_MODE_INFRA;
1013 }
1014
1015 /* process variable IE */
1016 while (bytesleftforcurrentbeacon >= 2) {
1017 elemID = (enum ieeetypes_elementid) (*((u8 *) pcurrentptr));
1018 elemlen = *((u8 *) pcurrentptr + 1);
1019
1020 if (bytesleftforcurrentbeacon < elemlen) {
1021 lbs_deb_scan("process_bss: error in processing IE, "
1022 "bytes left < IE length\n");
1023 bytesleftforcurrentbeacon = 0;
1024 continue;
1025 }
1026
1027 switch (elemID) {
1028 case SSID:
1029 bss->ssid_len = elemlen;
1030 memcpy(bss->ssid, (pcurrentptr + 2), elemlen);
1031 lbs_deb_scan("ssid '%s', ssid length %u\n",
1032 escape_essid(bss->ssid, bss->ssid_len),
1033 bss->ssid_len);
1034 break;
1035
1036 case SUPPORTED_RATES:
1037 memcpy(bss->datarates, (pcurrentptr + 2), elemlen);
1038 memmove(bss->libertas_supported_rates, (pcurrentptr + 2),
1039 elemlen);
1040 ratesize = elemlen;
1041 founddatarateie = 1;
1042 break;
1043
1044 case EXTRA_IE:
1045 lbs_deb_scan("process_bss: EXTRA_IE Found!\n");
1046 break;
1047
1048 case FH_PARAM_SET:
1049 pFH = (struct ieeetypes_fhparamset *) pcurrentptr;
1050 memmove(&bss->phyparamset.fhparamset, pFH,
1051 sizeof(struct ieeetypes_fhparamset));
1052 #if 0 /* I think we can store these LE */
1053 bss->phyparamset.fhparamset.dwelltime
1054 = le16_to_cpu(bss->phyparamset.fhparamset.dwelltime);
1055 #endif
1056 break;
1057
1058 case DS_PARAM_SET:
1059 pDS = (struct ieeetypes_dsparamset *) pcurrentptr;
1060 bss->channel = pDS->currentchan;
1061 memcpy(&bss->phyparamset.dsparamset, pDS,
1062 sizeof(struct ieeetypes_dsparamset));
1063 break;
1064
1065 case CF_PARAM_SET:
1066 pCF = (struct ieeetypes_cfparamset *) pcurrentptr;
1067 memcpy(&bss->ssparamset.cfparamset, pCF,
1068 sizeof(struct ieeetypes_cfparamset));
1069 break;
1070
1071 case IBSS_PARAM_SET:
1072 pibss = (struct ieeetypes_ibssparamset *) pcurrentptr;
1073 bss->atimwindow = le32_to_cpu(pibss->atimwindow);
1074 memmove(&bss->ssparamset.ibssparamset, pibss,
1075 sizeof(struct ieeetypes_ibssparamset));
1076 #if 0
1077 bss->ssparamset.ibssparamset.atimwindow
1078 = le16_to_cpu(bss->ssparamset.ibssparamset.atimwindow);
1079 #endif
1080 break;
1081
1082 /* Handle Country Info IE */
1083 case COUNTRY_INFO:
1084 pcountryinfo = (struct ieeetypes_countryinfoset *) pcurrentptr;
1085 if (pcountryinfo->len < sizeof(pcountryinfo->countrycode)
1086 || pcountryinfo->len > 254) {
1087 lbs_deb_scan("process_bss: 11D- Err "
1088 "CountryInfo len =%d min=%zd max=254\n",
1089 pcountryinfo->len,
1090 sizeof(pcountryinfo->countrycode));
1091 ret = -1;
1092 goto done;
1093 }
1094
1095 memcpy(&bss->countryinfo,
1096 pcountryinfo, pcountryinfo->len + 2);
1097 lbs_dbg_hex("process_bss: 11D- CountryInfo:",
1098 (u8 *) pcountryinfo,
1099 (u32) (pcountryinfo->len + 2));
1100 break;
1101
1102 case EXTENDED_SUPPORTED_RATES:
1103 /*
1104 * only process extended supported rate
1105 * if data rate is already found.
1106 * data rate IE should come before
1107 * extended supported rate IE
1108 */
1109 if (founddatarateie) {
1110 if ((elemlen + ratesize) > WLAN_SUPPORTED_RATES) {
1111 bytestocopy =
1112 (WLAN_SUPPORTED_RATES - ratesize);
1113 } else {
1114 bytestocopy = elemlen;
1115 }
1116
1117 pRate = (u8 *) bss->datarates;
1118 pRate += ratesize;
1119 memmove(pRate, (pcurrentptr + 2), bytestocopy);
1120 pRate = (u8 *) bss->libertas_supported_rates;
1121 pRate += ratesize;
1122 memmove(pRate, (pcurrentptr + 2), bytestocopy);
1123 }
1124 break;
1125
1126 case VENDOR_SPECIFIC_221:
1127 #define IE_ID_LEN_FIELDS_BYTES 2
1128 pIe = (struct IE_WPA *)pcurrentptr;
1129
1130 if (memcmp(pIe->oui, oui01, sizeof(oui01)))
1131 break;
1132
1133 bss->wpa_ie_len = min(elemlen + IE_ID_LEN_FIELDS_BYTES,
1134 MAX_WPA_IE_LEN);
1135 memcpy(bss->wpa_ie, pcurrentptr, bss->wpa_ie_len);
1136 lbs_dbg_hex("process_bss: WPA IE", bss->wpa_ie, elemlen);
1137 break;
1138 case WPA2_IE:
1139 pIe = (struct IE_WPA *)pcurrentptr;
1140 bss->rsn_ie_len = min(elemlen + IE_ID_LEN_FIELDS_BYTES,
1141 MAX_WPA_IE_LEN);
1142 memcpy(bss->rsn_ie, pcurrentptr, bss->rsn_ie_len);
1143 lbs_dbg_hex("process_bss: RSN_IE", bss->rsn_ie, elemlen);
1144 break;
1145 case TIM:
1146 break;
1147
1148 case CHALLENGE_TEXT:
1149 break;
1150 }
1151
1152 pcurrentptr += elemlen + 2;
1153
1154 /* need to account for IE ID and IE len */
1155 bytesleftforcurrentbeacon -= (elemlen + 2);
1156
1157 } /* while (bytesleftforcurrentbeacon > 2) */
1158
1159 /* Timestamp */
1160 bss->last_scanned = jiffies;
1161
1162 ret = 0;
1163
1164 done:
1165 lbs_deb_leave_args(LBS_DEB_SCAN, "ret %d", ret);
1166 return ret;
1167 }
1168
1169 /**
1170 * @brief Compare two SSIDs
1171 *
1172 * @param ssid1 A pointer to ssid to compare
1173 * @param ssid2 A pointer to ssid to compare
1174 *
1175 * @return 0--ssid is same, otherwise is different
1176 */
1177 int libertas_ssid_cmp(u8 *ssid1, u8 ssid1_len, u8 *ssid2, u8 ssid2_len)
1178 {
1179 if (ssid1_len != ssid2_len)
1180 return -1;
1181
1182 return memcmp(ssid1, ssid2, ssid1_len);
1183 }
1184
1185 /**
1186 * @brief This function finds a specific compatible BSSID in the scan list
1187 *
1188 * @param adapter A pointer to wlan_adapter
1189 * @param bssid BSSID to find in the scan list
1190 * @param mode Network mode: Infrastructure or IBSS
1191 *
1192 * @return index in BSSID list, or error return code (< 0)
1193 */
1194 struct bss_descriptor * libertas_find_bssid_in_list(wlan_adapter * adapter,
1195 u8 * bssid, u8 mode)
1196 {
1197 struct bss_descriptor * iter_bss;
1198 struct bss_descriptor * found_bss = NULL;
1199
1200 if (!bssid)
1201 return NULL;
1202
1203 lbs_dbg_hex("libertas_find_BSSID_in_list: looking for ",
1204 bssid, ETH_ALEN);
1205
1206 /* Look through the scan table for a compatible match. The loop will
1207 * continue past a matched bssid that is not compatible in case there
1208 * is an AP with multiple SSIDs assigned to the same BSSID
1209 */
1210 mutex_lock(&adapter->lock);
1211 list_for_each_entry (iter_bss, &adapter->network_list, list) {
1212 if (compare_ether_addr(iter_bss->bssid, bssid))
1213 continue; /* bssid doesn't match */
1214 switch (mode) {
1215 case IW_MODE_INFRA:
1216 case IW_MODE_ADHOC:
1217 if (!is_network_compatible(adapter, iter_bss, mode))
1218 break;
1219 found_bss = iter_bss;
1220 break;
1221 default:
1222 found_bss = iter_bss;
1223 break;
1224 }
1225 }
1226 mutex_unlock(&adapter->lock);
1227
1228 return found_bss;
1229 }
1230
1231 /**
1232 * @brief This function finds ssid in ssid list.
1233 *
1234 * @param adapter A pointer to wlan_adapter
1235 * @param ssid SSID to find in the list
1236 * @param bssid BSSID to qualify the SSID selection (if provided)
1237 * @param mode Network mode: Infrastructure or IBSS
1238 *
1239 * @return index in BSSID list
1240 */
1241 struct bss_descriptor * libertas_find_ssid_in_list(wlan_adapter * adapter,
1242 u8 *ssid, u8 ssid_len, u8 * bssid, u8 mode,
1243 int channel)
1244 {
1245 u8 bestrssi = 0;
1246 struct bss_descriptor * iter_bss = NULL;
1247 struct bss_descriptor * found_bss = NULL;
1248 struct bss_descriptor * tmp_oldest = NULL;
1249
1250 mutex_lock(&adapter->lock);
1251
1252 list_for_each_entry (iter_bss, &adapter->network_list, list) {
1253 if ( !tmp_oldest
1254 || (iter_bss->last_scanned < tmp_oldest->last_scanned))
1255 tmp_oldest = iter_bss;
1256
1257 if (libertas_ssid_cmp(iter_bss->ssid, iter_bss->ssid_len,
1258 ssid, ssid_len) != 0)
1259 continue; /* ssid doesn't match */
1260 if (bssid && compare_ether_addr(iter_bss->bssid, bssid) != 0)
1261 continue; /* bssid doesn't match */
1262 if ((channel > 0) && (iter_bss->channel != channel))
1263 continue; /* channel doesn't match */
1264
1265 switch (mode) {
1266 case IW_MODE_INFRA:
1267 case IW_MODE_ADHOC:
1268 if (!is_network_compatible(adapter, iter_bss, mode))
1269 break;
1270
1271 if (bssid) {
1272 /* Found requested BSSID */
1273 found_bss = iter_bss;
1274 goto out;
1275 }
1276
1277 if (SCAN_RSSI(iter_bss->rssi) > bestrssi) {
1278 bestrssi = SCAN_RSSI(iter_bss->rssi);
1279 found_bss = iter_bss;
1280 }
1281 break;
1282 case IW_MODE_AUTO:
1283 default:
1284 if (SCAN_RSSI(iter_bss->rssi) > bestrssi) {
1285 bestrssi = SCAN_RSSI(iter_bss->rssi);
1286 found_bss = iter_bss;
1287 }
1288 break;
1289 }
1290 }
1291
1292 out:
1293 mutex_unlock(&adapter->lock);
1294 return found_bss;
1295 }
1296
1297 /**
1298 * @brief This function finds the best SSID in the Scan List
1299 *
1300 * Search the scan table for the best SSID that also matches the current
1301 * adapter network preference (infrastructure or adhoc)
1302 *
1303 * @param adapter A pointer to wlan_adapter
1304 *
1305 * @return index in BSSID list
1306 */
1307 struct bss_descriptor * libertas_find_best_ssid_in_list(wlan_adapter * adapter,
1308 u8 mode)
1309 {
1310 u8 bestrssi = 0;
1311 struct bss_descriptor * iter_bss;
1312 struct bss_descriptor * best_bss = NULL;
1313
1314 mutex_lock(&adapter->lock);
1315
1316 list_for_each_entry (iter_bss, &adapter->network_list, list) {
1317 switch (mode) {
1318 case IW_MODE_INFRA:
1319 case IW_MODE_ADHOC:
1320 if (!is_network_compatible(adapter, iter_bss, mode))
1321 break;
1322 if (SCAN_RSSI(iter_bss->rssi) <= bestrssi)
1323 break;
1324 bestrssi = SCAN_RSSI(iter_bss->rssi);
1325 best_bss = iter_bss;
1326 break;
1327 case IW_MODE_AUTO:
1328 default:
1329 if (SCAN_RSSI(iter_bss->rssi) <= bestrssi)
1330 break;
1331 bestrssi = SCAN_RSSI(iter_bss->rssi);
1332 best_bss = iter_bss;
1333 break;
1334 }
1335 }
1336
1337 mutex_unlock(&adapter->lock);
1338 return best_bss;
1339 }
1340
1341 /**
1342 * @brief Find the AP with specific ssid in the scan list
1343 *
1344 * @param priv A pointer to wlan_private structure
1345 * @param pSSID A pointer to AP's ssid
1346 *
1347 * @return 0--success, otherwise--fail
1348 */
1349 int libertas_find_best_network_ssid(wlan_private * priv,
1350 u8 *out_ssid, u8 *out_ssid_len, u8 preferred_mode, u8 *out_mode)
1351 {
1352 wlan_adapter *adapter = priv->adapter;
1353 int ret = -1;
1354 struct bss_descriptor * found;
1355
1356 lbs_deb_enter(LBS_DEB_ASSOC);
1357
1358 wlan_scan_networks(priv, NULL, 1);
1359 if (adapter->surpriseremoved)
1360 return -1;
1361
1362 wait_event_interruptible(adapter->cmd_pending, !adapter->nr_cmd_pending);
1363
1364 found = libertas_find_best_ssid_in_list(adapter, preferred_mode);
1365 if (found && (found->ssid_len > 0)) {
1366 memcpy(out_ssid, &found->ssid, IW_ESSID_MAX_SIZE);
1367 *out_ssid_len = found->ssid_len;
1368 *out_mode = found->mode;
1369 ret = 0;
1370 }
1371
1372 lbs_deb_leave_args(LBS_DEB_SCAN, "ret %d", ret);
1373 return ret;
1374 }
1375
1376 /**
1377 * @brief Scan Network
1378 *
1379 * @param dev A pointer to net_device structure
1380 * @param info A pointer to iw_request_info structure
1381 * @param vwrq A pointer to iw_param structure
1382 * @param extra A pointer to extra data buf
1383 *
1384 * @return 0 --success, otherwise fail
1385 */
1386 int libertas_set_scan(struct net_device *dev, struct iw_request_info *info,
1387 struct iw_param *vwrq, char *extra)
1388 {
1389 wlan_private *priv = dev->priv;
1390 wlan_adapter *adapter = priv->adapter;
1391
1392 lbs_deb_enter(LBS_DEB_SCAN);
1393
1394 wlan_scan_networks(priv, NULL, 0);
1395
1396 if (adapter->surpriseremoved)
1397 return -1;
1398
1399 lbs_deb_leave(LBS_DEB_SCAN);
1400 return 0;
1401 }
1402
1403 /**
1404 * @brief Send a scan command for all available channels filtered on a spec
1405 *
1406 * @param priv A pointer to wlan_private structure
1407 * @param prequestedssid A pointer to AP's ssid
1408 * @param keeppreviousscan Flag used to save/clear scan table before scan
1409 *
1410 * @return 0-success, otherwise fail
1411 */
1412 int libertas_send_specific_ssid_scan(wlan_private * priv,
1413 u8 *ssid, u8 ssid_len, u8 clear_ssid)
1414 {
1415 wlan_adapter *adapter = priv->adapter;
1416 struct wlan_ioctl_user_scan_cfg scancfg;
1417 int ret = 0;
1418
1419 lbs_deb_enter(LBS_DEB_ASSOC);
1420
1421 if (!ssid_len)
1422 goto out;
1423
1424 memset(&scancfg, 0x00, sizeof(scancfg));
1425 memcpy(scancfg.ssid, ssid, ssid_len);
1426 scancfg.ssid_len = ssid_len;
1427 scancfg.clear_ssid = clear_ssid;
1428
1429 wlan_scan_networks(priv, &scancfg, 1);
1430 if (adapter->surpriseremoved)
1431 return -1;
1432 wait_event_interruptible(adapter->cmd_pending, !adapter->nr_cmd_pending);
1433
1434 out:
1435 lbs_deb_leave(LBS_DEB_ASSOC);
1436 return ret;
1437 }
1438
1439 /**
1440 * @brief scan an AP with specific BSSID
1441 *
1442 * @param priv A pointer to wlan_private structure
1443 * @param bssid A pointer to AP's bssid
1444 * @param keeppreviousscan Flag used to save/clear scan table before scan
1445 *
1446 * @return 0-success, otherwise fail
1447 */
1448 int libertas_send_specific_bssid_scan(wlan_private * priv, u8 * bssid, u8 clear_bssid)
1449 {
1450 struct wlan_ioctl_user_scan_cfg scancfg;
1451
1452 lbs_deb_enter(LBS_DEB_ASSOC);
1453
1454 if (bssid == NULL)
1455 goto out;
1456
1457 memset(&scancfg, 0x00, sizeof(scancfg));
1458 memcpy(scancfg.bssid, bssid, ETH_ALEN);
1459 scancfg.clear_bssid = clear_bssid;
1460
1461 wlan_scan_networks(priv, &scancfg, 1);
1462 if (priv->adapter->surpriseremoved)
1463 return -1;
1464 wait_event_interruptible(priv->adapter->cmd_pending,
1465 !priv->adapter->nr_cmd_pending);
1466
1467 out:
1468 lbs_deb_leave(LBS_DEB_ASSOC);
1469 return 0;
1470 }
1471
1472 static inline char *libertas_translate_scan(wlan_private *priv,
1473 char *start, char *stop,
1474 struct bss_descriptor *bss)
1475 {
1476 wlan_adapter *adapter = priv->adapter;
1477 struct chan_freq_power *cfp;
1478 char *current_val; /* For rates */
1479 struct iw_event iwe; /* Temporary buffer */
1480 int j;
1481 #define PERFECT_RSSI ((u8)50)
1482 #define WORST_RSSI ((u8)0)
1483 #define RSSI_DIFF ((u8)(PERFECT_RSSI - WORST_RSSI))
1484 u8 rssi;
1485
1486 cfp = libertas_find_cfp_by_band_and_channel(adapter, 0, bss->channel);
1487 if (!cfp) {
1488 lbs_deb_scan("Invalid channel number %d\n", bss->channel);
1489 return NULL;
1490 }
1491
1492 /* First entry *MUST* be the AP BSSID */
1493 iwe.cmd = SIOCGIWAP;
1494 iwe.u.ap_addr.sa_family = ARPHRD_ETHER;
1495 memcpy(iwe.u.ap_addr.sa_data, &bss->bssid, ETH_ALEN);
1496 start = iwe_stream_add_event(start, stop, &iwe, IW_EV_ADDR_LEN);
1497
1498 /* SSID */
1499 iwe.cmd = SIOCGIWESSID;
1500 iwe.u.data.flags = 1;
1501 iwe.u.data.length = min((u32) bss->ssid_len, (u32) IW_ESSID_MAX_SIZE);
1502 start = iwe_stream_add_point(start, stop, &iwe, bss->ssid);
1503
1504 /* Mode */
1505 iwe.cmd = SIOCGIWMODE;
1506 iwe.u.mode = bss->mode;
1507 start = iwe_stream_add_event(start, stop, &iwe, IW_EV_UINT_LEN);
1508
1509 /* Frequency */
1510 iwe.cmd = SIOCGIWFREQ;
1511 iwe.u.freq.m = (long)cfp->freq * 100000;
1512 iwe.u.freq.e = 1;
1513 start = iwe_stream_add_event(start, stop, &iwe, IW_EV_FREQ_LEN);
1514
1515 /* Add quality statistics */
1516 iwe.cmd = IWEVQUAL;
1517 iwe.u.qual.updated = IW_QUAL_ALL_UPDATED;
1518 iwe.u.qual.level = SCAN_RSSI(bss->rssi);
1519
1520 rssi = iwe.u.qual.level - MRVDRV_NF_DEFAULT_SCAN_VALUE;
1521 iwe.u.qual.qual =
1522 (100 * RSSI_DIFF * RSSI_DIFF - (PERFECT_RSSI - rssi) *
1523 (15 * (RSSI_DIFF) + 62 * (PERFECT_RSSI - rssi))) /
1524 (RSSI_DIFF * RSSI_DIFF);
1525 if (iwe.u.qual.qual > 100)
1526 iwe.u.qual.qual = 100;
1527
1528 if (adapter->NF[TYPE_BEACON][TYPE_NOAVG] == 0) {
1529 iwe.u.qual.noise = MRVDRV_NF_DEFAULT_SCAN_VALUE;
1530 } else {
1531 iwe.u.qual.noise =
1532 CAL_NF(adapter->NF[TYPE_BEACON][TYPE_NOAVG]);
1533 }
1534
1535 /* Locally created ad-hoc BSSs won't have beacons if this is the
1536 * only station in the adhoc network; so get signal strength
1537 * from receive statistics.
1538 */
1539 if ((adapter->mode == IW_MODE_ADHOC)
1540 && adapter->adhoccreate
1541 && !libertas_ssid_cmp(adapter->curbssparams.ssid,
1542 adapter->curbssparams.ssid_len,
1543 bss->ssid, bss->ssid_len)) {
1544 int snr, nf;
1545 snr = adapter->SNR[TYPE_RXPD][TYPE_AVG] / AVG_SCALE;
1546 nf = adapter->NF[TYPE_RXPD][TYPE_AVG] / AVG_SCALE;
1547 iwe.u.qual.level = CAL_RSSI(snr, nf);
1548 }
1549 start = iwe_stream_add_event(start, stop, &iwe, IW_EV_QUAL_LEN);
1550
1551 /* Add encryption capability */
1552 iwe.cmd = SIOCGIWENCODE;
1553 if (bss->privacy) {
1554 iwe.u.data.flags = IW_ENCODE_ENABLED | IW_ENCODE_NOKEY;
1555 } else {
1556 iwe.u.data.flags = IW_ENCODE_DISABLED;
1557 }
1558 iwe.u.data.length = 0;
1559 start = iwe_stream_add_point(start, stop, &iwe, bss->ssid);
1560
1561 current_val = start + IW_EV_LCP_LEN;
1562
1563 iwe.cmd = SIOCGIWRATE;
1564 iwe.u.bitrate.fixed = 0;
1565 iwe.u.bitrate.disabled = 0;
1566 iwe.u.bitrate.value = 0;
1567
1568 for (j = 0; j < sizeof(bss->libertas_supported_rates); j++) {
1569 u8 rate = bss->libertas_supported_rates[j];
1570 if (rate == 0)
1571 break; /* no more rates */
1572 /* Bit rate given in 500 kb/s units (+ 0x80) */
1573 iwe.u.bitrate.value = (rate & 0x7f) * 500000;
1574 current_val = iwe_stream_add_value(start, current_val,
1575 stop, &iwe, IW_EV_PARAM_LEN);
1576 }
1577 if ((bss->mode == IW_MODE_ADHOC)
1578 && !libertas_ssid_cmp(adapter->curbssparams.ssid,
1579 adapter->curbssparams.ssid_len,
1580 bss->ssid, bss->ssid_len)
1581 && adapter->adhoccreate) {
1582 iwe.u.bitrate.value = 22 * 500000;
1583 current_val = iwe_stream_add_value(start, current_val,
1584 stop, &iwe, IW_EV_PARAM_LEN);
1585 }
1586 /* Check if we added any event */
1587 if((current_val - start) > IW_EV_LCP_LEN)
1588 start = current_val;
1589
1590 memset(&iwe, 0, sizeof(iwe));
1591 if (bss->wpa_ie_len) {
1592 char buf[MAX_WPA_IE_LEN];
1593 memcpy(buf, bss->wpa_ie, bss->wpa_ie_len);
1594 iwe.cmd = IWEVGENIE;
1595 iwe.u.data.length = bss->wpa_ie_len;
1596 start = iwe_stream_add_point(start, stop, &iwe, buf);
1597 }
1598
1599 memset(&iwe, 0, sizeof(iwe));
1600 if (bss->rsn_ie_len) {
1601 char buf[MAX_WPA_IE_LEN];
1602 memcpy(buf, bss->rsn_ie, bss->rsn_ie_len);
1603 iwe.cmd = IWEVGENIE;
1604 iwe.u.data.length = bss->rsn_ie_len;
1605 start = iwe_stream_add_point(start, stop, &iwe, buf);
1606 }
1607
1608 return start;
1609 }
1610
1611 /**
1612 * @brief Retrieve the scan table entries via wireless tools IOCTL call
1613 *
1614 * @param dev A pointer to net_device structure
1615 * @param info A pointer to iw_request_info structure
1616 * @param dwrq A pointer to iw_point structure
1617 * @param extra A pointer to extra data buf
1618 *
1619 * @return 0 --success, otherwise fail
1620 */
1621 int libertas_get_scan(struct net_device *dev, struct iw_request_info *info,
1622 struct iw_point *dwrq, char *extra)
1623 {
1624 #define SCAN_ITEM_SIZE 128
1625 wlan_private *priv = dev->priv;
1626 wlan_adapter *adapter = priv->adapter;
1627 int err = 0;
1628 char *ev = extra;
1629 char *stop = ev + dwrq->length;
1630 struct bss_descriptor * iter_bss;
1631 struct bss_descriptor * safe;
1632
1633 lbs_deb_enter(LBS_DEB_ASSOC);
1634
1635 /* If we've got an uncompleted scan, schedule the next part */
1636 if (!adapter->nr_cmd_pending && adapter->last_scanned_channel)
1637 wlan_scan_networks(priv, NULL, 0);
1638
1639 /* Update RSSI if current BSS is a locally created ad-hoc BSS */
1640 if ((adapter->mode == IW_MODE_ADHOC) && adapter->adhoccreate) {
1641 libertas_prepare_and_send_command(priv, cmd_802_11_rssi, 0,
1642 cmd_option_waitforrsp, 0, NULL);
1643 }
1644
1645 mutex_lock(&adapter->lock);
1646 list_for_each_entry_safe (iter_bss, safe, &adapter->network_list, list) {
1647 char * next_ev;
1648 unsigned long stale_time;
1649
1650 if (stop - ev < SCAN_ITEM_SIZE) {
1651 err = -E2BIG;
1652 break;
1653 }
1654
1655 /* Prune old an old scan result */
1656 stale_time = iter_bss->last_scanned + DEFAULT_MAX_SCAN_AGE;
1657 if (time_after(jiffies, stale_time)) {
1658 list_move_tail (&iter_bss->list,
1659 &adapter->network_free_list);
1660 clear_bss_descriptor(iter_bss);
1661 continue;
1662 }
1663
1664 /* Translate to WE format this entry */
1665 next_ev = libertas_translate_scan(priv, ev, stop, iter_bss);
1666 if (next_ev == NULL)
1667 continue;
1668 ev = next_ev;
1669 }
1670 mutex_unlock(&adapter->lock);
1671
1672 dwrq->length = (ev - extra);
1673 dwrq->flags = 0;
1674
1675 lbs_deb_leave(LBS_DEB_ASSOC);
1676 return err;
1677 }
1678
1679 /**
1680 * @brief Prepare a scan command to be sent to the firmware
1681 *
1682 * Use the wlan_scan_cmd_config sent to the command processing module in
1683 * the libertas_prepare_and_send_command to configure a cmd_ds_802_11_scan command
1684 * struct to send to firmware.
1685 *
1686 * The fixed fields specifying the BSS type and BSSID filters as well as a
1687 * variable number/length of TLVs are sent in the command to firmware.
1688 *
1689 * @param priv A pointer to wlan_private structure
1690 * @param cmd A pointer to cmd_ds_command structure to be sent to
1691 * firmware with the cmd_DS_801_11_SCAN structure
1692 * @param pdata_buf Void pointer cast of a wlan_scan_cmd_config struct used
1693 * to set the fields/TLVs for the command sent to firmware
1694 *
1695 * @return 0 or -1
1696 *
1697 * @sa wlan_scan_create_channel_list
1698 */
1699 int libertas_cmd_80211_scan(wlan_private * priv,
1700 struct cmd_ds_command *cmd, void *pdata_buf)
1701 {
1702 struct cmd_ds_802_11_scan *pscan = &cmd->params.scan;
1703 struct wlan_scan_cmd_config *pscancfg;
1704
1705 lbs_deb_enter(LBS_DEB_ASSOC);
1706
1707 pscancfg = pdata_buf;
1708
1709 /* Set fixed field variables in scan command */
1710 pscan->bsstype = pscancfg->bsstype;
1711 memcpy(pscan->BSSID, pscancfg->bssid, sizeof(pscan->BSSID));
1712 memcpy(pscan->tlvbuffer, pscancfg->tlvbuffer, pscancfg->tlvbufferlen);
1713
1714 cmd->command = cpu_to_le16(cmd_802_11_scan);
1715
1716 /* size is equal to the sizeof(fixed portions) + the TLV len + header */
1717 cmd->size = cpu_to_le16(sizeof(pscan->bsstype)
1718 + sizeof(pscan->BSSID)
1719 + pscancfg->tlvbufferlen + S_DS_GEN);
1720
1721 lbs_deb_scan("SCAN_CMD: command=%x, size=%x, seqnum=%x\n",
1722 le16_to_cpu(cmd->command), le16_to_cpu(cmd->size),
1723 le16_to_cpu(cmd->seqnum));
1724
1725 lbs_deb_leave(LBS_DEB_ASSOC);
1726 return 0;
1727 }
1728
1729 static inline int is_same_network(struct bss_descriptor *src,
1730 struct bss_descriptor *dst)
1731 {
1732 /* A network is only a duplicate if the channel, BSSID, and ESSID
1733 * all match. We treat all <hidden> with the same BSSID and channel
1734 * as one network */
1735 return ((src->ssid_len == dst->ssid_len) &&
1736 (src->channel == dst->channel) &&
1737 !compare_ether_addr(src->bssid, dst->bssid) &&
1738 !memcmp(src->ssid, dst->ssid, src->ssid_len));
1739 }
1740
1741 /**
1742 * @brief This function handles the command response of scan
1743 *
1744 * The response buffer for the scan command has the following
1745 * memory layout:
1746 *
1747 * .-----------------------------------------------------------.
1748 * | header (4 * sizeof(u16)): Standard command response hdr |
1749 * .-----------------------------------------------------------.
1750 * | bufsize (u16) : sizeof the BSS Description data |
1751 * .-----------------------------------------------------------.
1752 * | NumOfSet (u8) : Number of BSS Descs returned |
1753 * .-----------------------------------------------------------.
1754 * | BSSDescription data (variable, size given in bufsize) |
1755 * .-----------------------------------------------------------.
1756 * | TLV data (variable, size calculated using header->size, |
1757 * | bufsize and sizeof the fixed fields above) |
1758 * .-----------------------------------------------------------.
1759 *
1760 * @param priv A pointer to wlan_private structure
1761 * @param resp A pointer to cmd_ds_command
1762 *
1763 * @return 0 or -1
1764 */
1765 int libertas_ret_80211_scan(wlan_private * priv, struct cmd_ds_command *resp)
1766 {
1767 wlan_adapter *adapter = priv->adapter;
1768 struct cmd_ds_802_11_scan_rsp *pscan;
1769 struct mrvlietypes_data *ptlv;
1770 struct mrvlietypes_tsftimestamp *ptsftlv;
1771 struct bss_descriptor * iter_bss;
1772 struct bss_descriptor * safe;
1773 u8 *pbssinfo;
1774 u16 scanrespsize;
1775 int bytesleft;
1776 int idx;
1777 int tlvbufsize;
1778 int ret;
1779
1780 lbs_deb_enter(LBS_DEB_ASSOC);
1781
1782 /* Prune old entries from scan table */
1783 list_for_each_entry_safe (iter_bss, safe, &adapter->network_list, list) {
1784 unsigned long stale_time = iter_bss->last_scanned + DEFAULT_MAX_SCAN_AGE;
1785 if (time_before(jiffies, stale_time))
1786 continue;
1787 list_move_tail (&iter_bss->list, &adapter->network_free_list);
1788 clear_bss_descriptor(iter_bss);
1789 }
1790
1791 pscan = &resp->params.scanresp;
1792
1793 if (pscan->nr_sets > MAX_NETWORK_COUNT) {
1794 lbs_deb_scan(
1795 "SCAN_RESP: too many scan results (%d, max %d)!!\n",
1796 pscan->nr_sets, MAX_NETWORK_COUNT);
1797 ret = -1;
1798 goto done;
1799 }
1800
1801 bytesleft = le16_to_cpu(pscan->bssdescriptsize);
1802 lbs_deb_scan("SCAN_RESP: bssdescriptsize %d\n", bytesleft);
1803
1804 scanrespsize = le16_to_cpu(resp->size);
1805 lbs_deb_scan("SCAN_RESP: returned %d AP before parsing\n",
1806 pscan->nr_sets);
1807
1808 pbssinfo = pscan->bssdesc_and_tlvbuffer;
1809
1810 /* The size of the TLV buffer is equal to the entire command response
1811 * size (scanrespsize) minus the fixed fields (sizeof()'s), the
1812 * BSS Descriptions (bssdescriptsize as bytesLef) and the command
1813 * response header (S_DS_GEN)
1814 */
1815 tlvbufsize = scanrespsize - (bytesleft + sizeof(pscan->bssdescriptsize)
1816 + sizeof(pscan->nr_sets)
1817 + S_DS_GEN);
1818
1819 ptlv = (struct mrvlietypes_data *) (pscan->bssdesc_and_tlvbuffer + bytesleft);
1820
1821 /* Search the TLV buffer space in the scan response for any valid TLVs */
1822 wlan_ret_802_11_scan_get_tlv_ptrs(ptlv, tlvbufsize, &ptsftlv);
1823
1824 /*
1825 * Process each scan response returned (pscan->nr_sets). Save
1826 * the information in the newbssentry and then insert into the
1827 * driver scan table either as an update to an existing entry
1828 * or as an addition at the end of the table
1829 */
1830 for (idx = 0; idx < pscan->nr_sets && bytesleft; idx++) {
1831 struct bss_descriptor new;
1832 struct bss_descriptor * found = NULL;
1833 struct bss_descriptor * oldest = NULL;
1834
1835 /* Process the data fields and IEs returned for this BSS */
1836 memset(&new, 0, sizeof (struct bss_descriptor));
1837 if (libertas_process_bss(&new, &pbssinfo, &bytesleft) != 0) {
1838 /* error parsing the scan response, skipped */
1839 lbs_deb_scan("SCAN_RESP: process_bss returned ERROR\n");
1840 continue;
1841 }
1842
1843 /* Try to find this bss in the scan table */
1844 list_for_each_entry (iter_bss, &adapter->network_list, list) {
1845 if (is_same_network(iter_bss, &new)) {
1846 found = iter_bss;
1847 break;
1848 }
1849
1850 if ((oldest == NULL) ||
1851 (iter_bss->last_scanned < oldest->last_scanned))
1852 oldest = iter_bss;
1853 }
1854
1855 if (found) {
1856 /* found, clear it */
1857 clear_bss_descriptor(found);
1858 } else if (!list_empty(&adapter->network_free_list)) {
1859 /* Pull one from the free list */
1860 found = list_entry(adapter->network_free_list.next,
1861 struct bss_descriptor, list);
1862 list_move_tail(&found->list, &adapter->network_list);
1863 } else if (oldest) {
1864 /* If there are no more slots, expire the oldest */
1865 found = oldest;
1866 clear_bss_descriptor(found);
1867 list_move_tail(&found->list, &adapter->network_list);
1868 } else {
1869 continue;
1870 }
1871
1872 lbs_deb_scan("SCAN_RESP: BSSID = " MAC_FMT "\n",
1873 new.bssid[0], new.bssid[1], new.bssid[2],
1874 new.bssid[3], new.bssid[4], new.bssid[5]);
1875
1876 /*
1877 * If the TSF TLV was appended to the scan results, save the
1878 * this entries TSF value in the networktsf field. The
1879 * networktsf is the firmware's TSF value at the time the
1880 * beacon or probe response was received.
1881 */
1882 if (ptsftlv) {
1883 new.networktsf = le64_to_cpup(&ptsftlv->tsftable[idx]);
1884 }
1885
1886 /* Copy the locally created newbssentry to the scan table */
1887 memcpy(found, &new, offsetof(struct bss_descriptor, list));
1888 }
1889
1890 ret = 0;
1891
1892 done:
1893 lbs_deb_leave_args(LBS_DEB_SCAN, "ret %d", ret);
1894 return ret;
1895 }
Tomato firmware and modifications.