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[PATCH] libertas: remove bss_descriptior->networktsf
[linux-2.6/zen-sources.git] / drivers / net / wireless / libertas / scan.c
blobaea2e90b5558219a8a91ea5d9ac73de467ee319b
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 #include "join.h"
21
22 //! Approximate amount of data needed to pass a scan result back to iwlist
23 #define MAX_SCAN_CELL_SIZE (IW_EV_ADDR_LEN \
24 + IW_ESSID_MAX_SIZE \
25 + IW_EV_UINT_LEN \
26 + IW_EV_FREQ_LEN \
27 + IW_EV_QUAL_LEN \
28 + IW_ESSID_MAX_SIZE \
29 + IW_EV_PARAM_LEN \
30 + 40) /* 40 for WPAIE */
31
32 //! Memory needed to store a max sized channel List TLV for a firmware scan
33 #define CHAN_TLV_MAX_SIZE (sizeof(struct mrvlietypesheader) \
34 + (MRVDRV_MAX_CHANNELS_PER_SCAN \
35 * sizeof(struct chanscanparamset)))
36
37 //! Memory needed to store a max number/size SSID TLV for a firmware scan
38 #define SSID_TLV_MAX_SIZE (1 * sizeof(struct mrvlietypes_ssidparamset))
39
40 //! Maximum memory needed for a wlan_scan_cmd_config with all TLVs at max
41 #define MAX_SCAN_CFG_ALLOC (sizeof(struct wlan_scan_cmd_config) \
42 + sizeof(struct mrvlietypes_numprobes) \
43 + CHAN_TLV_MAX_SIZE \
44 + SSID_TLV_MAX_SIZE)
45
46 //! The maximum number of channels the firmware can scan per command
47 #define MRVDRV_MAX_CHANNELS_PER_SCAN 14
48
49 /**
50 * @brief Number of channels to scan per firmware scan command issuance.
51 *
52 * Number restricted to prevent hitting the limit on the amount of scan data
53 * returned in a single firmware scan command.
54 */
55 #define MRVDRV_CHANNELS_PER_SCAN_CMD 4
56
57 //! Scan time specified in the channel TLV for each channel for passive scans
58 #define MRVDRV_PASSIVE_SCAN_CHAN_TIME 100
59
60 //! Scan time specified in the channel TLV for each channel for active scans
61 #define MRVDRV_ACTIVE_SCAN_CHAN_TIME 100
62
63 static const u8 zeromac[ETH_ALEN] = { 0x00, 0x00, 0x00, 0x00, 0x00, 0x00 };
64 static const u8 bcastmac[ETH_ALEN] = { 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF };
65
66 static inline void clear_bss_descriptor (struct bss_descriptor * bss)
67 {
68 /* Don't blow away ->list, just BSS data */
69 memset(bss, 0, offsetof(struct bss_descriptor, list));
70 }
71
72 static inline int match_bss_no_security(struct wlan_802_11_security * secinfo,
73 struct bss_descriptor * match_bss)
74 {
75 if ( !secinfo->wep_enabled
76 && !secinfo->WPAenabled
77 && !secinfo->WPA2enabled
78 && match_bss->wpa_ie[0] != MFIE_TYPE_GENERIC
79 && match_bss->rsn_ie[0] != MFIE_TYPE_RSN
80 && !(match_bss->capability & WLAN_CAPABILITY_PRIVACY)) {
81 return 1;
82 }
83 return 0;
84 }
85
86 static inline int match_bss_static_wep(struct wlan_802_11_security * secinfo,
87 struct bss_descriptor * match_bss)
88 {
89 if ( secinfo->wep_enabled
90 && !secinfo->WPAenabled
91 && !secinfo->WPA2enabled
92 && (match_bss->capability & WLAN_CAPABILITY_PRIVACY)) {
93 return 1;
94 }
95 return 0;
96 }
97
98 static inline int match_bss_wpa(struct wlan_802_11_security * secinfo,
99 struct bss_descriptor * match_bss)
100 {
101 if ( !secinfo->wep_enabled
102 && secinfo->WPAenabled
103 && (match_bss->wpa_ie[0] == MFIE_TYPE_GENERIC)
104 /* privacy bit may NOT be set in some APs like LinkSys WRT54G
105 && (match_bss->capability & WLAN_CAPABILITY_PRIVACY)) {
106 */
107 ) {
108 return 1;
109 }
110 return 0;
111 }
112
113 static inline int match_bss_wpa2(struct wlan_802_11_security * secinfo,
114 struct bss_descriptor * match_bss)
115 {
116 if ( !secinfo->wep_enabled
117 && secinfo->WPA2enabled
118 && (match_bss->rsn_ie[0] == MFIE_TYPE_RSN)
119 /* privacy bit may NOT be set in some APs like LinkSys WRT54G
120 && (match_bss->capability & WLAN_CAPABILITY_PRIVACY)) {
121 */
122 ) {
123 return 1;
124 }
125 return 0;
126 }
127
128 static inline int match_bss_dynamic_wep(struct wlan_802_11_security * secinfo,
129 struct bss_descriptor * match_bss)
130 {
131 if ( !secinfo->wep_enabled
132 && !secinfo->WPAenabled
133 && !secinfo->WPA2enabled
134 && (match_bss->wpa_ie[0] != MFIE_TYPE_GENERIC)
135 && (match_bss->rsn_ie[0] != MFIE_TYPE_RSN)
136 && (match_bss->capability & WLAN_CAPABILITY_PRIVACY)) {
137 return 1;
138 }
139 return 0;
140 }
141
142 /**
143 * @brief Check if a scanned network compatible with the driver settings
144 *
145 * WEP WPA WPA2 ad-hoc encrypt Network
146 * enabled enabled enabled AES mode privacy WPA WPA2 Compatible
147 * 0 0 0 0 NONE 0 0 0 yes No security
148 * 1 0 0 0 NONE 1 0 0 yes Static WEP
149 * 0 1 0 0 x 1x 1 x yes WPA
150 * 0 0 1 0 x 1x x 1 yes WPA2
151 * 0 0 0 1 NONE 1 0 0 yes Ad-hoc AES
152 * 0 0 0 0 !=NONE 1 0 0 yes Dynamic WEP
153 *
154 *
155 * @param adapter A pointer to wlan_adapter
156 * @param index Index in scantable to check against current driver settings
157 * @param mode Network mode: Infrastructure or IBSS
158 *
159 * @return Index in scantable, or error code if negative
160 */
161 static int is_network_compatible(wlan_adapter * adapter,
162 struct bss_descriptor * bss, u8 mode)
163 {
164 int matched = 0;
165
166 lbs_deb_enter(LBS_DEB_ASSOC);
167
168 if (bss->mode != mode)
169 goto done;
170
171 if ((matched = match_bss_no_security(&adapter->secinfo, bss))) {
172 goto done;
173 } else if ((matched = match_bss_static_wep(&adapter->secinfo, bss))) {
174 goto done;
175 } else if ((matched = match_bss_wpa(&adapter->secinfo, bss))) {
176 lbs_deb_scan(
177 "is_network_compatible() WPA: wpa_ie=%#x "
178 "wpa2_ie=%#x WEP=%s WPA=%s WPA2=%s "
179 "privacy=%#x\n", bss->wpa_ie[0], bss->rsn_ie[0],
180 adapter->secinfo.wep_enabled ? "e" : "d",
181 adapter->secinfo.WPAenabled ? "e" : "d",
182 adapter->secinfo.WPA2enabled ? "e" : "d",
183 (bss->capability & WLAN_CAPABILITY_PRIVACY));
184 goto done;
185 } else if ((matched = match_bss_wpa2(&adapter->secinfo, bss))) {
186 lbs_deb_scan(
187 "is_network_compatible() WPA2: wpa_ie=%#x "
188 "wpa2_ie=%#x WEP=%s WPA=%s WPA2=%s "
189 "privacy=%#x\n", bss->wpa_ie[0], bss->rsn_ie[0],
190 adapter->secinfo.wep_enabled ? "e" : "d",
191 adapter->secinfo.WPAenabled ? "e" : "d",
192 adapter->secinfo.WPA2enabled ? "e" : "d",
193 (bss->capability & WLAN_CAPABILITY_PRIVACY));
194 goto done;
195 } else if ((matched = match_bss_dynamic_wep(&adapter->secinfo, bss))) {
196 lbs_deb_scan(
197 "is_network_compatible() dynamic WEP: "
198 "wpa_ie=%#x wpa2_ie=%#x privacy=%#x\n",
199 bss->wpa_ie[0], bss->rsn_ie[0],
200 (bss->capability & WLAN_CAPABILITY_PRIVACY));
201 goto done;
202 }
203
204 /* bss security settings don't match those configured on card */
205 lbs_deb_scan(
206 "is_network_compatible() FAILED: wpa_ie=%#x "
207 "wpa2_ie=%#x WEP=%s WPA=%s WPA2=%s privacy=%#x\n",
208 bss->wpa_ie[0], bss->rsn_ie[0],
209 adapter->secinfo.wep_enabled ? "e" : "d",
210 adapter->secinfo.WPAenabled ? "e" : "d",
211 adapter->secinfo.WPA2enabled ? "e" : "d",
212 (bss->capability & WLAN_CAPABILITY_PRIVACY));
213
214 done:
215 lbs_deb_leave(LBS_DEB_SCAN);
216 return matched;
217 }
218
219 /**
220 * @brief Create a channel list for the driver to scan based on region info
221 *
222 * Use the driver region/band information to construct a comprehensive list
223 * of channels to scan. This routine is used for any scan that is not
224 * provided a specific channel list to scan.
225 *
226 * @param priv A pointer to wlan_private structure
227 * @param scanchanlist Output parameter: resulting channel list to scan
228 * @param filteredscan Flag indicating whether or not a BSSID or SSID filter
229 * is being sent in the command to firmware. Used to
230 * increase the number of channels sent in a scan
231 * command and to disable the firmware channel scan
232 * filter.
233 *
234 * @return void
235 */
236 static void wlan_scan_create_channel_list(wlan_private * priv,
237 struct chanscanparamset * scanchanlist,
238 u8 filteredscan)
239 {
240
241 wlan_adapter *adapter = priv->adapter;
242 struct region_channel *scanregion;
243 struct chan_freq_power *cfp;
244 int rgnidx;
245 int chanidx;
246 int nextchan;
247 u8 scantype;
248
249 chanidx = 0;
250
251 /* Set the default scan type to the user specified type, will later
252 * be changed to passive on a per channel basis if restricted by
253 * regulatory requirements (11d or 11h)
254 */
255 scantype = CMD_SCAN_TYPE_ACTIVE;
256
257 for (rgnidx = 0; rgnidx < ARRAY_SIZE(adapter->region_channel); rgnidx++) {
258 if (priv->adapter->enable11d &&
259 adapter->connect_status != LIBERTAS_CONNECTED) {
260 /* Scan all the supported chan for the first scan */
261 if (!adapter->universal_channel[rgnidx].valid)
262 continue;
263 scanregion = &adapter->universal_channel[rgnidx];
264
265 /* clear the parsed_region_chan for the first scan */
266 memset(&adapter->parsed_region_chan, 0x00,
267 sizeof(adapter->parsed_region_chan));
268 } else {
269 if (!adapter->region_channel[rgnidx].valid)
270 continue;
271 scanregion = &adapter->region_channel[rgnidx];
272 }
273
274 for (nextchan = 0;
275 nextchan < scanregion->nrcfp; nextchan++, chanidx++) {
276
277 cfp = scanregion->CFP + nextchan;
278
279 if (priv->adapter->enable11d) {
280 scantype =
281 libertas_get_scan_type_11d(cfp->channel,
282 &adapter->
283 parsed_region_chan);
284 }
285
286 switch (scanregion->band) {
287 case BAND_B:
288 case BAND_G:
289 default:
290 scanchanlist[chanidx].radiotype =
291 CMD_SCAN_RADIO_TYPE_BG;
292 break;
293 }
294
295 if (scantype == CMD_SCAN_TYPE_PASSIVE) {
296 scanchanlist[chanidx].maxscantime =
297 cpu_to_le16(MRVDRV_PASSIVE_SCAN_CHAN_TIME);
298 scanchanlist[chanidx].chanscanmode.passivescan =
299 1;
300 } else {
301 scanchanlist[chanidx].maxscantime =
302 cpu_to_le16(MRVDRV_ACTIVE_SCAN_CHAN_TIME);
303 scanchanlist[chanidx].chanscanmode.passivescan =
304 0;
305 }
306
307 scanchanlist[chanidx].channumber = cfp->channel;
308
309 if (filteredscan) {
310 scanchanlist[chanidx].chanscanmode.
311 disablechanfilt = 1;
312 }
313 }
314 }
315 }
316
317 /**
318 * @brief Construct a wlan_scan_cmd_config structure to use in issue scan cmds
319 *
320 * Application layer or other functions can invoke wlan_scan_networks
321 * with a scan configuration supplied in a wlan_ioctl_user_scan_cfg struct.
322 * This structure is used as the basis of one or many wlan_scan_cmd_config
323 * commands that are sent to the command processing module and sent to
324 * firmware.
325 *
326 * Create a wlan_scan_cmd_config based on the following user supplied
327 * parameters (if present):
328 * - SSID filter
329 * - BSSID filter
330 * - Number of Probes to be sent
331 * - channel list
332 *
333 * If the SSID or BSSID filter is not present, disable/clear the filter.
334 * If the number of probes is not set, use the adapter default setting
335 * Qualify the channel
336 *
337 * @param priv A pointer to wlan_private structure
338 * @param puserscanin NULL or pointer to scan configuration parameters
339 * @param ppchantlvout Output parameter: Pointer to the start of the
340 * channel TLV portion of the output scan config
341 * @param pscanchanlist Output parameter: Pointer to the resulting channel
342 * list to scan
343 * @param pmaxchanperscan Output parameter: Number of channels to scan for
344 * each issuance of the firmware scan command
345 * @param pfilteredscan Output parameter: Flag indicating whether or not
346 * a BSSID or SSID filter is being sent in the
347 * command to firmware. Used to increase the number
348 * of channels sent in a scan command and to
349 * disable the firmware channel scan filter.
350 * @param pscancurrentonly Output parameter: Flag indicating whether or not
351 * we are only scanning our current active channel
352 *
353 * @return resulting scan configuration
354 */
355 static struct wlan_scan_cmd_config *
356 wlan_scan_setup_scan_config(wlan_private * priv,
357 const struct wlan_ioctl_user_scan_cfg * puserscanin,
358 struct mrvlietypes_chanlistparamset ** ppchantlvout,
359 struct chanscanparamset * pscanchanlist,
360 int *pmaxchanperscan,
361 u8 * pfilteredscan,
362 u8 * pscancurrentonly)
363 {
364 struct mrvlietypes_numprobes *pnumprobestlv;
365 struct mrvlietypes_ssidparamset *pssidtlv;
366 struct wlan_scan_cmd_config * pscancfgout = NULL;
367 u8 *ptlvpos;
368 u16 numprobes;
369 int chanidx;
370 int scantype;
371 int scandur;
372 int channel;
373 int radiotype;
374
375 pscancfgout = kzalloc(MAX_SCAN_CFG_ALLOC, GFP_KERNEL);
376 if (pscancfgout == NULL)
377 goto out;
378
379 /* The tlvbufferlen is calculated for each scan command. The TLVs added
380 * in this routine will be preserved since the routine that sends
381 * the command will append channelTLVs at *ppchantlvout. The difference
382 * between the *ppchantlvout and the tlvbuffer start will be used
383 * to calculate the size of anything we add in this routine.
384 */
385 pscancfgout->tlvbufferlen = 0;
386
387 /* Running tlv pointer. Assigned to ppchantlvout at end of function
388 * so later routines know where channels can be added to the command buf
389 */
390 ptlvpos = pscancfgout->tlvbuffer;
391
392 /*
393 * Set the initial scan paramters for progressive scanning. If a specific
394 * BSSID or SSID is used, the number of channels in the scan command
395 * will be increased to the absolute maximum
396 */
397 *pmaxchanperscan = MRVDRV_CHANNELS_PER_SCAN_CMD;
398
399 /* Initialize the scan as un-filtered by firmware, set to TRUE below if
400 * a SSID or BSSID filter is sent in the command
401 */
402 *pfilteredscan = 0;
403
404 /* Initialize the scan as not being only on the current channel. If
405 * the channel list is customized, only contains one channel, and
406 * is the active channel, this is set true and data flow is not halted.
407 */
408 *pscancurrentonly = 0;
409
410 if (puserscanin) {
411
412 /* Set the bss type scan filter, use adapter setting if unset */
413 pscancfgout->bsstype =
414 puserscanin->bsstype ? puserscanin->bsstype : CMD_BSS_TYPE_ANY;
415
416 /* Set the number of probes to send, use adapter setting if unset */
417 numprobes = puserscanin->numprobes ? puserscanin->numprobes : 0;
418
419 /*
420 * Set the BSSID filter to the incoming configuration,
421 * if non-zero. If not set, it will remain disabled (all zeros).
422 */
423 memcpy(pscancfgout->bssid, puserscanin->bssid,
424 sizeof(pscancfgout->bssid));
425
426 if (puserscanin->ssid_len) {
427 pssidtlv =
428 (struct mrvlietypes_ssidparamset *) pscancfgout->
429 tlvbuffer;
430 pssidtlv->header.type = cpu_to_le16(TLV_TYPE_SSID);
431 pssidtlv->header.len = cpu_to_le16(puserscanin->ssid_len);
432 memcpy(pssidtlv->ssid, puserscanin->ssid,
433 puserscanin->ssid_len);
434 ptlvpos += sizeof(pssidtlv->header) + puserscanin->ssid_len;
435 }
436
437 /*
438 * The default number of channels sent in the command is low to
439 * ensure the response buffer from the firmware does not truncate
440 * scan results. That is not an issue with an SSID or BSSID
441 * filter applied to the scan results in the firmware.
442 */
443 if ( puserscanin->ssid_len
444 || (compare_ether_addr(pscancfgout->bssid, &zeromac[0]) != 0)) {
445 *pmaxchanperscan = MRVDRV_MAX_CHANNELS_PER_SCAN;
446 *pfilteredscan = 1;
447 }
448 } else {
449 pscancfgout->bsstype = CMD_BSS_TYPE_ANY;
450 numprobes = 0;
451 }
452
453 /* If the input config or adapter has the number of Probes set, add tlv */
454 if (numprobes) {
455 pnumprobestlv = (struct mrvlietypes_numprobes *) ptlvpos;
456 pnumprobestlv->header.type = cpu_to_le16(TLV_TYPE_NUMPROBES);
457 pnumprobestlv->header.len = cpu_to_le16(2);
458 pnumprobestlv->numprobes = cpu_to_le16(numprobes);
459
460 ptlvpos += sizeof(*pnumprobestlv);
461 }
462
463 /*
464 * Set the output for the channel TLV to the address in the tlv buffer
465 * past any TLVs that were added in this fuction (SSID, numprobes).
466 * channel TLVs will be added past this for each scan command, preserving
467 * the TLVs that were previously added.
468 */
469 *ppchantlvout = (struct mrvlietypes_chanlistparamset *) ptlvpos;
470
471 if (puserscanin && puserscanin->chanlist[0].channumber) {
472
473 lbs_deb_scan("Scan: Using supplied channel list\n");
474
475 for (chanidx = 0;
476 chanidx < WLAN_IOCTL_USER_SCAN_CHAN_MAX
477 && puserscanin->chanlist[chanidx].channumber; chanidx++) {
478
479 channel = puserscanin->chanlist[chanidx].channumber;
480 (pscanchanlist + chanidx)->channumber = channel;
481
482 radiotype = puserscanin->chanlist[chanidx].radiotype;
483 (pscanchanlist + chanidx)->radiotype = radiotype;
484
485 scantype = puserscanin->chanlist[chanidx].scantype;
486
487 if (scantype == CMD_SCAN_TYPE_PASSIVE) {
488 (pscanchanlist +
489 chanidx)->chanscanmode.passivescan = 1;
490 } else {
491 (pscanchanlist +
492 chanidx)->chanscanmode.passivescan = 0;
493 }
494
495 if (puserscanin->chanlist[chanidx].scantime) {
496 scandur =
497 puserscanin->chanlist[chanidx].scantime;
498 } else {
499 if (scantype == CMD_SCAN_TYPE_PASSIVE) {
500 scandur = MRVDRV_PASSIVE_SCAN_CHAN_TIME;
501 } else {
502 scandur = MRVDRV_ACTIVE_SCAN_CHAN_TIME;
503 }
504 }
505
506 (pscanchanlist + chanidx)->minscantime =
507 cpu_to_le16(scandur);
508 (pscanchanlist + chanidx)->maxscantime =
509 cpu_to_le16(scandur);
510 }
511
512 /* Check if we are only scanning the current channel */
513 if ((chanidx == 1) && (puserscanin->chanlist[0].channumber
514 ==
515 priv->adapter->curbssparams.channel)) {
516 *pscancurrentonly = 1;
517 lbs_deb_scan("Scan: Scanning current channel only");
518 }
519
520 } else {
521 lbs_deb_scan("Scan: Creating full region channel list\n");
522 wlan_scan_create_channel_list(priv, pscanchanlist,
523 *pfilteredscan);
524 }
525
526 out:
527 return pscancfgout;
528 }
529
530 /**
531 * @brief Construct and send multiple scan config commands to the firmware
532 *
533 * Previous routines have created a wlan_scan_cmd_config with any requested
534 * TLVs. This function splits the channel TLV into maxchanperscan lists
535 * and sends the portion of the channel TLV along with the other TLVs
536 * to the wlan_cmd routines for execution in the firmware.
537 *
538 * @param priv A pointer to wlan_private structure
539 * @param maxchanperscan Maximum number channels to be included in each
540 * scan command sent to firmware
541 * @param filteredscan Flag indicating whether or not a BSSID or SSID
542 * filter is being used for the firmware command
543 * scan command sent to firmware
544 * @param pscancfgout Scan configuration used for this scan.
545 * @param pchantlvout Pointer in the pscancfgout where the channel TLV
546 * should start. This is past any other TLVs that
547 * must be sent down in each firmware command.
548 * @param pscanchanlist List of channels to scan in maxchanperscan segments
549 *
550 * @return 0 or error return otherwise
551 */
552 static int wlan_scan_channel_list(wlan_private * priv,
553 int maxchanperscan,
554 u8 filteredscan,
555 struct wlan_scan_cmd_config * pscancfgout,
556 struct mrvlietypes_chanlistparamset * pchantlvout,
557 struct chanscanparamset * pscanchanlist,
558 const struct wlan_ioctl_user_scan_cfg * puserscanin,
559 int full_scan)
560 {
561 struct chanscanparamset *ptmpchan;
562 struct chanscanparamset *pstartchan;
563 u8 scanband;
564 int doneearly;
565 int tlvidx;
566 int ret = 0;
567 int scanned = 0;
568 union iwreq_data wrqu;
569
570 lbs_deb_enter(LBS_DEB_ASSOC);
571
572 if (pscancfgout == 0 || pchantlvout == 0 || pscanchanlist == 0) {
573 lbs_deb_scan("Scan: Null detect: %p, %p, %p\n",
574 pscancfgout, pchantlvout, pscanchanlist);
575 return -1;
576 }
577
578 pchantlvout->header.type = cpu_to_le16(TLV_TYPE_CHANLIST);
579
580 /* Set the temp channel struct pointer to the start of the desired list */
581 ptmpchan = pscanchanlist;
582
583 if (priv->adapter->last_scanned_channel && !puserscanin)
584 ptmpchan += priv->adapter->last_scanned_channel;
585
586 /* Loop through the desired channel list, sending a new firmware scan
587 * commands for each maxchanperscan channels (or for 1,6,11 individually
588 * if configured accordingly)
589 */
590 while (ptmpchan->channumber) {
591
592 tlvidx = 0;
593 pchantlvout->header.len = 0;
594 scanband = ptmpchan->radiotype;
595 pstartchan = ptmpchan;
596 doneearly = 0;
597
598 /* Construct the channel TLV for the scan command. Continue to
599 * insert channel TLVs until:
600 * - the tlvidx hits the maximum configured per scan command
601 * - the next channel to insert is 0 (end of desired channel list)
602 * - doneearly is set (controlling individual scanning of 1,6,11)
603 */
604 while (tlvidx < maxchanperscan && ptmpchan->channumber
605 && !doneearly && scanned < 2) {
606
607 lbs_deb_scan(
608 "Scan: Chan(%3d), Radio(%d), mode(%d,%d), Dur(%d)\n",
609 ptmpchan->channumber, ptmpchan->radiotype,
610 ptmpchan->chanscanmode.passivescan,
611 ptmpchan->chanscanmode.disablechanfilt,
612 ptmpchan->maxscantime);
613
614 /* Copy the current channel TLV to the command being prepared */
615 memcpy(pchantlvout->chanscanparam + tlvidx,
616 ptmpchan, sizeof(pchantlvout->chanscanparam));
617
618 /* Increment the TLV header length by the size appended */
619 /* Ew, it would be _so_ nice if we could just declare the
620 variable little-endian and let GCC handle it for us */
621 pchantlvout->header.len =
622 cpu_to_le16(le16_to_cpu(pchantlvout->header.len) +
623 sizeof(pchantlvout->chanscanparam));
624
625 /*
626 * The tlv buffer length is set to the number of bytes of the
627 * between the channel tlv pointer and the start of the
628 * tlv buffer. This compensates for any TLVs that were appended
629 * before the channel list.
630 */
631 pscancfgout->tlvbufferlen = ((u8 *) pchantlvout
632 - pscancfgout->tlvbuffer);
633
634 /* Add the size of the channel tlv header and the data length */
635 pscancfgout->tlvbufferlen +=
636 (sizeof(pchantlvout->header)
637 + le16_to_cpu(pchantlvout->header.len));
638
639 /* Increment the index to the channel tlv we are constructing */
640 tlvidx++;
641
642 doneearly = 0;
643
644 /* Stop the loop if the *current* channel is in the 1,6,11 set
645 * and we are not filtering on a BSSID or SSID.
646 */
647 if (!filteredscan && (ptmpchan->channumber == 1
648 || ptmpchan->channumber == 6
649 || ptmpchan->channumber == 11)) {
650 doneearly = 1;
651 }
652
653 /* Increment the tmp pointer to the next channel to be scanned */
654 ptmpchan++;
655 scanned++;
656
657 /* Stop the loop if the *next* channel is in the 1,6,11 set.
658 * This will cause it to be the only channel scanned on the next
659 * interation
660 */
661 if (!filteredscan && (ptmpchan->channumber == 1
662 || ptmpchan->channumber == 6
663 || ptmpchan->channumber == 11)) {
664 doneearly = 1;
665 }
666 }
667
668 /* Send the scan command to the firmware with the specified cfg */
669 ret = libertas_prepare_and_send_command(priv, CMD_802_11_SCAN, 0,
670 0, 0, pscancfgout);
671 if (scanned >= 2 && !full_scan) {
672 ret = 0;
673 goto done;
674 }
675 scanned = 0;
676 }
677
678 done:
679 priv->adapter->last_scanned_channel = ptmpchan->channumber;
680
681 /* Tell userspace the scan table has been updated */
682 memset(&wrqu, 0, sizeof(union iwreq_data));
683 wireless_send_event(priv->dev, SIOCGIWSCAN, &wrqu, NULL);
684
685 lbs_deb_leave_args(LBS_DEB_SCAN, "ret %d", ret);
686 return ret;
687 }
688
689 static void
690 clear_selected_scan_list_entries(wlan_adapter * adapter,
691 const struct wlan_ioctl_user_scan_cfg * scan_cfg)
692 {
693 struct bss_descriptor * bss;
694 struct bss_descriptor * safe;
695 u32 clear_ssid_flag = 0, clear_bssid_flag = 0;
696
697 if (!scan_cfg)
698 return;
699
700 if (scan_cfg->clear_ssid && scan_cfg->ssid_len)
701 clear_ssid_flag = 1;
702
703 if (scan_cfg->clear_bssid
704 && (compare_ether_addr(scan_cfg->bssid, &zeromac[0]) != 0)
705 && (compare_ether_addr(scan_cfg->bssid, &bcastmac[0]) != 0)) {
706 clear_bssid_flag = 1;
707 }
708
709 if (!clear_ssid_flag && !clear_bssid_flag)
710 return;
711
712 mutex_lock(&adapter->lock);
713 list_for_each_entry_safe (bss, safe, &adapter->network_list, list) {
714 u32 clear = 0;
715
716 /* Check for an SSID match */
717 if ( clear_ssid_flag
718 && (bss->ssid_len == scan_cfg->ssid_len)
719 && !memcmp(bss->ssid, scan_cfg->ssid, bss->ssid_len))
720 clear = 1;
721
722 /* Check for a BSSID match */
723 if ( clear_bssid_flag
724 && !compare_ether_addr(bss->bssid, scan_cfg->bssid))
725 clear = 1;
726
727 if (clear) {
728 list_move_tail (&bss->list, &adapter->network_free_list);
729 clear_bss_descriptor(bss);
730 }
731 }
732 mutex_unlock(&adapter->lock);
733 }
734
735
736 /**
737 * @brief Internal function used to start a scan based on an input config
738 *
739 * Use the input user scan configuration information when provided in
740 * order to send the appropriate scan commands to firmware to populate or
741 * update the internal driver scan table
742 *
743 * @param priv A pointer to wlan_private structure
744 * @param puserscanin Pointer to the input configuration for the requested
745 * scan.
746 *
747 * @return 0 or < 0 if error
748 */
749 int wlan_scan_networks(wlan_private * priv,
750 const struct wlan_ioctl_user_scan_cfg * puserscanin,
751 int full_scan)
752 {
753 wlan_adapter * adapter = priv->adapter;
754 struct mrvlietypes_chanlistparamset *pchantlvout;
755 struct chanscanparamset * scan_chan_list = NULL;
756 struct wlan_scan_cmd_config * scan_cfg = NULL;
757 u8 filteredscan;
758 u8 scancurrentchanonly;
759 int maxchanperscan;
760 int ret;
761 #ifdef CONFIG_LIBERTAS_DEBUG
762 struct bss_descriptor * iter_bss;
763 int i = 0;
764 #endif
765
766 lbs_deb_enter(LBS_DEB_ASSOC);
767
768 scan_chan_list = kzalloc(sizeof(struct chanscanparamset) *
769 WLAN_IOCTL_USER_SCAN_CHAN_MAX, GFP_KERNEL);
770 if (scan_chan_list == NULL) {
771 ret = -ENOMEM;
772 goto out;
773 }
774
775 scan_cfg = wlan_scan_setup_scan_config(priv,
776 puserscanin,
777 &pchantlvout,
778 scan_chan_list,
779 &maxchanperscan,
780 &filteredscan,
781 &scancurrentchanonly);
782 if (scan_cfg == NULL) {
783 ret = -ENOMEM;
784 goto out;
785 }
786
787 clear_selected_scan_list_entries(adapter, puserscanin);
788
789 /* Keep the data path active if we are only scanning our current channel */
790 if (!scancurrentchanonly) {
791 netif_stop_queue(priv->dev);
792 netif_carrier_off(priv->dev);
793 if (priv->mesh_dev) {
794 netif_stop_queue(priv->mesh_dev);
795 netif_carrier_off(priv->mesh_dev);
796 }
797 }
798
799 ret = wlan_scan_channel_list(priv,
800 maxchanperscan,
801 filteredscan,
802 scan_cfg,
803 pchantlvout,
804 scan_chan_list,
805 puserscanin,
806 full_scan);
807
808 #ifdef CONFIG_LIBERTAS_DEBUG
809 /* Dump the scan table */
810 mutex_lock(&adapter->lock);
811 list_for_each_entry (iter_bss, &adapter->network_list, list) {
812 lbs_deb_scan("Scan:(%02d) " MAC_FMT ", RSSI[%03d], SSID[%s]\n",
813 i++, MAC_ARG(iter_bss->bssid), (s32) iter_bss->rssi,
814 escape_essid(iter_bss->ssid, iter_bss->ssid_len));
815 }
816 mutex_unlock(&adapter->lock);
817 #endif
818
819 if (priv->adapter->connect_status == LIBERTAS_CONNECTED) {
820 netif_carrier_on(priv->dev);
821 netif_wake_queue(priv->dev);
822 if (priv->mesh_dev) {
823 netif_carrier_on(priv->mesh_dev);
824 netif_wake_queue(priv->mesh_dev);
825 }
826 }
827
828 out:
829 if (scan_cfg)
830 kfree(scan_cfg);
831
832 if (scan_chan_list)
833 kfree(scan_chan_list);
834
835 lbs_deb_leave_args(LBS_DEB_SCAN, "ret %d", ret);
836 return ret;
837 }
838
839 /**
840 * @brief Interpret a BSS scan response returned from the firmware
841 *
842 * Parse the various fixed fields and IEs passed back for a a BSS probe
843 * response or beacon from the scan command. Record information as needed
844 * in the scan table struct bss_descriptor for that entry.
845 *
846 * @param bss Output parameter: Pointer to the BSS Entry
847 *
848 * @return 0 or -1
849 */
850 static int libertas_process_bss(struct bss_descriptor * bss,
851 u8 ** pbeaconinfo, int *bytesleft)
852 {
853 struct ieeetypes_fhparamset *pFH;
854 struct ieeetypes_dsparamset *pDS;
855 struct ieeetypes_cfparamset *pCF;
856 struct ieeetypes_ibssparamset *pibss;
857 struct ieeetypes_countryinfoset *pcountryinfo;
858 u8 *pos, *end, *p;
859 u8 n_ex_rates = 0, got_basic_rates = 0, n_basic_rates = 0;
860 u16 beaconsize = 0;
861 int ret;
862
863 lbs_deb_enter(LBS_DEB_ASSOC);
864
865 if (*bytesleft >= sizeof(beaconsize)) {
866 /* Extract & convert beacon size from the command buffer */
867 beaconsize = le16_to_cpup((void *)*pbeaconinfo);
868 *bytesleft -= sizeof(beaconsize);
869 *pbeaconinfo += sizeof(beaconsize);
870 }
871
872 if (beaconsize == 0 || beaconsize > *bytesleft) {
873 *pbeaconinfo += *bytesleft;
874 *bytesleft = 0;
875 return -1;
876 }
877
878 /* Initialize the current working beacon pointer for this BSS iteration */
879 pos = *pbeaconinfo;
880 end = pos + beaconsize;
881
882 /* Advance the return beacon pointer past the current beacon */
883 *pbeaconinfo += beaconsize;
884 *bytesleft -= beaconsize;
885
886 memcpy(bss->bssid, pos, ETH_ALEN);
887 lbs_deb_scan("process_bss: AP BSSID " MAC_FMT "\n", MAC_ARG(bss->bssid));
888 pos += ETH_ALEN;
889
890 if ((end - pos) < 12) {
891 lbs_deb_scan("process_bss: Not enough bytes left\n");
892 return -1;
893 }
894
895 /*
896 * next 4 fields are RSSI, time stamp, beacon interval,
897 * and capability information
898 */
899
900 /* RSSI is 1 byte long */
901 bss->rssi = *pos;
902 lbs_deb_scan("process_bss: RSSI=%02X\n", *pos);
903 pos++;
904
905 /* time stamp is 8 bytes long */
906 bss->timestamp = le64_to_cpup((void *) pos);
907 pos += 8;
908
909 /* beacon interval is 2 bytes long */
910 bss->beaconperiod = le16_to_cpup((void *) pos);
911 pos += 2;
912
913 /* capability information is 2 bytes long */
914 bss->capability = le16_to_cpup((void *) pos);
915 lbs_deb_scan("process_bss: capabilities = 0x%4X\n", bss->capability);
916 pos += 2;
917
918 if (bss->capability & WLAN_CAPABILITY_PRIVACY)
919 lbs_deb_scan("process_bss: AP WEP enabled\n");
920 if (bss->capability & WLAN_CAPABILITY_IBSS)
921 bss->mode = IW_MODE_ADHOC;
922 else
923 bss->mode = IW_MODE_INFRA;
924
925 /* rest of the current buffer are IE's */
926 lbs_deb_scan("process_bss: IE length for this AP = %zd\n", end - pos);
927 lbs_deb_hex(LBS_DEB_SCAN, "process_bss: IE info", pos, end - pos);
928
929 /* process variable IE */
930 while (pos <= end - 2) {
931 struct ieee80211_info_element * elem =
932 (struct ieee80211_info_element *) pos;
933
934 if (pos + elem->len > end) {
935 lbs_deb_scan("process_bss: error in processing IE, "
936 "bytes left < IE length\n");
937 break;
938 }
939
940 switch (elem->id) {
941 case MFIE_TYPE_SSID:
942 bss->ssid_len = elem->len;
943 memcpy(bss->ssid, elem->data, elem->len);
944 lbs_deb_scan("ssid '%s', ssid length %u\n",
945 escape_essid(bss->ssid, bss->ssid_len),
946 bss->ssid_len);
947 break;
948
949 case MFIE_TYPE_RATES:
950 n_basic_rates = min_t(u8, MAX_RATES, elem->len);
951 memcpy(bss->rates, elem->data, n_basic_rates);
952 got_basic_rates = 1;
953 break;
954
955 case MFIE_TYPE_FH_SET:
956 pFH = (struct ieeetypes_fhparamset *) pos;
957 memmove(&bss->phyparamset.fhparamset, pFH,
958 sizeof(struct ieeetypes_fhparamset));
959 #if 0 /* I think we can store these LE */
960 bss->phyparamset.fhparamset.dwelltime
961 = le16_to_cpu(bss->phyparamset.fhparamset.dwelltime);
962 #endif
963 break;
964
965 case MFIE_TYPE_DS_SET:
966 pDS = (struct ieeetypes_dsparamset *) pos;
967 bss->channel = pDS->currentchan;
968 memcpy(&bss->phyparamset.dsparamset, pDS,
969 sizeof(struct ieeetypes_dsparamset));
970 break;
971
972 case MFIE_TYPE_CF_SET:
973 pCF = (struct ieeetypes_cfparamset *) pos;
974 memcpy(&bss->ssparamset.cfparamset, pCF,
975 sizeof(struct ieeetypes_cfparamset));
976 break;
977
978 case MFIE_TYPE_IBSS_SET:
979 pibss = (struct ieeetypes_ibssparamset *) pos;
980 bss->atimwindow = le32_to_cpu(pibss->atimwindow);
981 memmove(&bss->ssparamset.ibssparamset, pibss,
982 sizeof(struct ieeetypes_ibssparamset));
983 #if 0
984 bss->ssparamset.ibssparamset.atimwindow
985 = le16_to_cpu(bss->ssparamset.ibssparamset.atimwindow);
986 #endif
987 break;
988
989 case MFIE_TYPE_COUNTRY:
990 pcountryinfo = (struct ieeetypes_countryinfoset *) pos;
991 if (pcountryinfo->len < sizeof(pcountryinfo->countrycode)
992 || pcountryinfo->len > 254) {
993 lbs_deb_scan("process_bss: 11D- Err "
994 "CountryInfo len =%d min=%zd max=254\n",
995 pcountryinfo->len,
996 sizeof(pcountryinfo->countrycode));
997 ret = -1;
998 goto done;
999 }
1000
1001 memcpy(&bss->countryinfo,
1002 pcountryinfo, pcountryinfo->len + 2);
1003 lbs_deb_hex(LBS_DEB_SCAN, "process_bss: 11d countryinfo",
1004 (u8 *) pcountryinfo,
1005 (u32) (pcountryinfo->len + 2));
1006 break;
1007
1008 case MFIE_TYPE_RATES_EX:
1009 /* only process extended supported rate if data rate is
1010 * already found. Data rate IE should come before
1011 * extended supported rate IE
1012 */
1013 if (!got_basic_rates)
1014 break;
1015
1016 n_ex_rates = elem->len;
1017 if (n_basic_rates + n_ex_rates > MAX_RATES)
1018 n_ex_rates = MAX_RATES - n_basic_rates;
1019
1020 p = bss->rates + n_basic_rates;
1021 memcpy(p, elem->data, n_ex_rates);
1022 break;
1023
1024 case MFIE_TYPE_GENERIC:
1025 if (elem->len >= 4 &&
1026 elem->data[0] == 0x00 &&
1027 elem->data[1] == 0x50 &&
1028 elem->data[2] == 0xf2 &&
1029 elem->data[3] == 0x01) {
1030 bss->wpa_ie_len = min(elem->len + 2,
1031 MAX_WPA_IE_LEN);
1032 memcpy(bss->wpa_ie, elem, bss->wpa_ie_len);
1033 lbs_deb_hex(LBS_DEB_SCAN, "process_bss: WPA IE", bss->wpa_ie,
1034 elem->len);
1035 } else if (elem->len >= MARVELL_MESH_IE_LENGTH &&
1036 elem->data[0] == 0x00 &&
1037 elem->data[1] == 0x50 &&
1038 elem->data[2] == 0x43 &&
1039 elem->data[3] == 0x04) {
1040 bss->mesh = 1;
1041 }
1042 break;
1043
1044 case MFIE_TYPE_RSN:
1045 bss->rsn_ie_len = min(elem->len + 2, MAX_WPA_IE_LEN);
1046 memcpy(bss->rsn_ie, elem, bss->rsn_ie_len);
1047 lbs_deb_hex(LBS_DEB_SCAN, "process_bss: RSN_IE", bss->rsn_ie, elem->len);
1048 break;
1049
1050 default:
1051 break;
1052 }
1053
1054 pos += elem->len + 2;
1055 }
1056
1057 /* Timestamp */
1058 bss->last_scanned = jiffies;
1059 libertas_unset_basic_rate_flags(bss->rates, sizeof(bss->rates));
1060
1061 ret = 0;
1062
1063 done:
1064 lbs_deb_leave_args(LBS_DEB_SCAN, "ret %d", ret);
1065 return ret;
1066 }
1067
1068 /**
1069 * @brief Compare two SSIDs
1070 *
1071 * @param ssid1 A pointer to ssid to compare
1072 * @param ssid2 A pointer to ssid to compare
1073 *
1074 * @return 0--ssid is same, otherwise is different
1075 */
1076 int libertas_ssid_cmp(u8 *ssid1, u8 ssid1_len, u8 *ssid2, u8 ssid2_len)
1077 {
1078 if (ssid1_len != ssid2_len)
1079 return -1;
1080
1081 return memcmp(ssid1, ssid2, ssid1_len);
1082 }
1083
1084 /**
1085 * @brief This function finds a specific compatible BSSID in the scan list
1086 *
1087 * @param adapter A pointer to wlan_adapter
1088 * @param bssid BSSID to find in the scan list
1089 * @param mode Network mode: Infrastructure or IBSS
1090 *
1091 * @return index in BSSID list, or error return code (< 0)
1092 */
1093 struct bss_descriptor * libertas_find_bssid_in_list(wlan_adapter * adapter,
1094 u8 * bssid, u8 mode)
1095 {
1096 struct bss_descriptor * iter_bss;
1097 struct bss_descriptor * found_bss = NULL;
1098
1099 if (!bssid)
1100 return NULL;
1101
1102 lbs_deb_hex(LBS_DEB_SCAN, "looking for",
1103 bssid, ETH_ALEN);
1104
1105 /* Look through the scan table for a compatible match. The loop will
1106 * continue past a matched bssid that is not compatible in case there
1107 * is an AP with multiple SSIDs assigned to the same BSSID
1108 */
1109 mutex_lock(&adapter->lock);
1110 list_for_each_entry (iter_bss, &adapter->network_list, list) {
1111 if (compare_ether_addr(iter_bss->bssid, bssid))
1112 continue; /* bssid doesn't match */
1113 switch (mode) {
1114 case IW_MODE_INFRA:
1115 case IW_MODE_ADHOC:
1116 if (!is_network_compatible(adapter, iter_bss, mode))
1117 break;
1118 found_bss = iter_bss;
1119 break;
1120 default:
1121 found_bss = iter_bss;
1122 break;
1123 }
1124 }
1125 mutex_unlock(&adapter->lock);
1126
1127 return found_bss;
1128 }
1129
1130 /**
1131 * @brief This function finds ssid in ssid list.
1132 *
1133 * @param adapter A pointer to wlan_adapter
1134 * @param ssid SSID to find in the list
1135 * @param bssid BSSID to qualify the SSID selection (if provided)
1136 * @param mode Network mode: Infrastructure or IBSS
1137 *
1138 * @return index in BSSID list
1139 */
1140 struct bss_descriptor * libertas_find_ssid_in_list(wlan_adapter * adapter,
1141 u8 *ssid, u8 ssid_len, u8 * bssid, u8 mode,
1142 int channel)
1143 {
1144 u8 bestrssi = 0;
1145 struct bss_descriptor * iter_bss = NULL;
1146 struct bss_descriptor * found_bss = NULL;
1147 struct bss_descriptor * tmp_oldest = NULL;
1148
1149 mutex_lock(&adapter->lock);
1150
1151 list_for_each_entry (iter_bss, &adapter->network_list, list) {
1152 if ( !tmp_oldest
1153 || (iter_bss->last_scanned < tmp_oldest->last_scanned))
1154 tmp_oldest = iter_bss;
1155
1156 if (libertas_ssid_cmp(iter_bss->ssid, iter_bss->ssid_len,
1157 ssid, ssid_len) != 0)
1158 continue; /* ssid doesn't match */
1159 if (bssid && compare_ether_addr(iter_bss->bssid, bssid) != 0)
1160 continue; /* bssid doesn't match */
1161 if ((channel > 0) && (iter_bss->channel != channel))
1162 continue; /* channel doesn't match */
1163
1164 switch (mode) {
1165 case IW_MODE_INFRA:
1166 case IW_MODE_ADHOC:
1167 if (!is_network_compatible(adapter, iter_bss, mode))
1168 break;
1169
1170 if (bssid) {
1171 /* Found requested BSSID */
1172 found_bss = iter_bss;
1173 goto out;
1174 }
1175
1176 if (SCAN_RSSI(iter_bss->rssi) > bestrssi) {
1177 bestrssi = SCAN_RSSI(iter_bss->rssi);
1178 found_bss = iter_bss;
1179 }
1180 break;
1181 case IW_MODE_AUTO:
1182 default:
1183 if (SCAN_RSSI(iter_bss->rssi) > bestrssi) {
1184 bestrssi = SCAN_RSSI(iter_bss->rssi);
1185 found_bss = iter_bss;
1186 }
1187 break;
1188 }
1189 }
1190
1191 out:
1192 mutex_unlock(&adapter->lock);
1193 return found_bss;
1194 }
1195
1196 /**
1197 * @brief This function finds the best SSID in the Scan List
1198 *
1199 * Search the scan table for the best SSID that also matches the current
1200 * adapter network preference (infrastructure or adhoc)
1201 *
1202 * @param adapter A pointer to wlan_adapter
1203 *
1204 * @return index in BSSID list
1205 */
1206 static struct bss_descriptor * libertas_find_best_ssid_in_list(wlan_adapter * adapter,
1207 u8 mode)
1208 {
1209 u8 bestrssi = 0;
1210 struct bss_descriptor * iter_bss;
1211 struct bss_descriptor * best_bss = NULL;
1212
1213 mutex_lock(&adapter->lock);
1214
1215 list_for_each_entry (iter_bss, &adapter->network_list, list) {
1216 switch (mode) {
1217 case IW_MODE_INFRA:
1218 case IW_MODE_ADHOC:
1219 if (!is_network_compatible(adapter, iter_bss, mode))
1220 break;
1221 if (SCAN_RSSI(iter_bss->rssi) <= bestrssi)
1222 break;
1223 bestrssi = SCAN_RSSI(iter_bss->rssi);
1224 best_bss = iter_bss;
1225 break;
1226 case IW_MODE_AUTO:
1227 default:
1228 if (SCAN_RSSI(iter_bss->rssi) <= bestrssi)
1229 break;
1230 bestrssi = SCAN_RSSI(iter_bss->rssi);
1231 best_bss = iter_bss;
1232 break;
1233 }
1234 }
1235
1236 mutex_unlock(&adapter->lock);
1237 return best_bss;
1238 }
1239
1240 /**
1241 * @brief Find the AP with specific ssid in the scan list
1242 *
1243 * @param priv A pointer to wlan_private structure
1244 * @param pSSID A pointer to AP's ssid
1245 *
1246 * @return 0--success, otherwise--fail
1247 */
1248 int libertas_find_best_network_ssid(wlan_private * priv,
1249 u8 *out_ssid, u8 *out_ssid_len, u8 preferred_mode, u8 *out_mode)
1250 {
1251 wlan_adapter *adapter = priv->adapter;
1252 int ret = -1;
1253 struct bss_descriptor * found;
1254
1255 lbs_deb_enter(LBS_DEB_ASSOC);
1256
1257 wlan_scan_networks(priv, NULL, 1);
1258 if (adapter->surpriseremoved)
1259 return -1;
1260
1261 wait_event_interruptible(adapter->cmd_pending, !adapter->nr_cmd_pending);
1262
1263 found = libertas_find_best_ssid_in_list(adapter, preferred_mode);
1264 if (found && (found->ssid_len > 0)) {
1265 memcpy(out_ssid, &found->ssid, IW_ESSID_MAX_SIZE);
1266 *out_ssid_len = found->ssid_len;
1267 *out_mode = found->mode;
1268 ret = 0;
1269 }
1270
1271 lbs_deb_leave_args(LBS_DEB_SCAN, "ret %d", ret);
1272 return ret;
1273 }
1274
1275 /**
1276 * @brief Scan Network
1277 *
1278 * @param dev A pointer to net_device structure
1279 * @param info A pointer to iw_request_info structure
1280 * @param vwrq A pointer to iw_param structure
1281 * @param extra A pointer to extra data buf
1282 *
1283 * @return 0 --success, otherwise fail
1284 */
1285 int libertas_set_scan(struct net_device *dev, struct iw_request_info *info,
1286 struct iw_param *vwrq, char *extra)
1287 {
1288 wlan_private *priv = dev->priv;
1289 wlan_adapter *adapter = priv->adapter;
1290
1291 lbs_deb_enter(LBS_DEB_SCAN);
1292
1293 wlan_scan_networks(priv, NULL, 0);
1294
1295 if (adapter->surpriseremoved)
1296 return -1;
1297
1298 lbs_deb_leave(LBS_DEB_SCAN);
1299 return 0;
1300 }
1301
1302 /**
1303 * @brief Send a scan command for all available channels filtered on a spec
1304 *
1305 * @param priv A pointer to wlan_private structure
1306 * @param prequestedssid A pointer to AP's ssid
1307 * @param keeppreviousscan Flag used to save/clear scan table before scan
1308 *
1309 * @return 0-success, otherwise fail
1310 */
1311 int libertas_send_specific_ssid_scan(wlan_private * priv,
1312 u8 *ssid, u8 ssid_len, u8 clear_ssid)
1313 {
1314 wlan_adapter *adapter = priv->adapter;
1315 struct wlan_ioctl_user_scan_cfg scancfg;
1316 int ret = 0;
1317
1318 lbs_deb_enter(LBS_DEB_ASSOC);
1319
1320 if (!ssid_len)
1321 goto out;
1322
1323 memset(&scancfg, 0x00, sizeof(scancfg));
1324 memcpy(scancfg.ssid, ssid, ssid_len);
1325 scancfg.ssid_len = ssid_len;
1326 scancfg.clear_ssid = clear_ssid;
1327
1328 wlan_scan_networks(priv, &scancfg, 1);
1329 if (adapter->surpriseremoved)
1330 return -1;
1331 wait_event_interruptible(adapter->cmd_pending, !adapter->nr_cmd_pending);
1332
1333 out:
1334 lbs_deb_leave(LBS_DEB_ASSOC);
1335 return ret;
1336 }
1337
1338 static inline char *libertas_translate_scan(wlan_private *priv,
1339 char *start, char *stop,
1340 struct bss_descriptor *bss)
1341 {
1342 wlan_adapter *adapter = priv->adapter;
1343 struct chan_freq_power *cfp;
1344 char *current_val; /* For rates */
1345 struct iw_event iwe; /* Temporary buffer */
1346 int j;
1347 #define PERFECT_RSSI ((u8)50)
1348 #define WORST_RSSI ((u8)0)
1349 #define RSSI_DIFF ((u8)(PERFECT_RSSI - WORST_RSSI))
1350 u8 rssi;
1351
1352 cfp = libertas_find_cfp_by_band_and_channel(adapter, 0, bss->channel);
1353 if (!cfp) {
1354 lbs_deb_scan("Invalid channel number %d\n", bss->channel);
1355 return NULL;
1356 }
1357
1358 /* First entry *MUST* be the AP BSSID */
1359 iwe.cmd = SIOCGIWAP;
1360 iwe.u.ap_addr.sa_family = ARPHRD_ETHER;
1361 memcpy(iwe.u.ap_addr.sa_data, &bss->bssid, ETH_ALEN);
1362 start = iwe_stream_add_event(start, stop, &iwe, IW_EV_ADDR_LEN);
1363
1364 /* SSID */
1365 iwe.cmd = SIOCGIWESSID;
1366 iwe.u.data.flags = 1;
1367 iwe.u.data.length = min((u32) bss->ssid_len, (u32) IW_ESSID_MAX_SIZE);
1368 start = iwe_stream_add_point(start, stop, &iwe, bss->ssid);
1369
1370 /* Mode */
1371 iwe.cmd = SIOCGIWMODE;
1372 iwe.u.mode = bss->mode;
1373 start = iwe_stream_add_event(start, stop, &iwe, IW_EV_UINT_LEN);
1374
1375 /* Frequency */
1376 iwe.cmd = SIOCGIWFREQ;
1377 iwe.u.freq.m = (long)cfp->freq * 100000;
1378 iwe.u.freq.e = 1;
1379 start = iwe_stream_add_event(start, stop, &iwe, IW_EV_FREQ_LEN);
1380
1381 /* Add quality statistics */
1382 iwe.cmd = IWEVQUAL;
1383 iwe.u.qual.updated = IW_QUAL_ALL_UPDATED;
1384 iwe.u.qual.level = SCAN_RSSI(bss->rssi);
1385
1386 rssi = iwe.u.qual.level - MRVDRV_NF_DEFAULT_SCAN_VALUE;
1387 iwe.u.qual.qual =
1388 (100 * RSSI_DIFF * RSSI_DIFF - (PERFECT_RSSI - rssi) *
1389 (15 * (RSSI_DIFF) + 62 * (PERFECT_RSSI - rssi))) /
1390 (RSSI_DIFF * RSSI_DIFF);
1391 if (iwe.u.qual.qual > 100)
1392 iwe.u.qual.qual = 100;
1393
1394 if (adapter->NF[TYPE_BEACON][TYPE_NOAVG] == 0) {
1395 iwe.u.qual.noise = MRVDRV_NF_DEFAULT_SCAN_VALUE;
1396 } else {
1397 iwe.u.qual.noise =
1398 CAL_NF(adapter->NF[TYPE_BEACON][TYPE_NOAVG]);
1399 }
1400
1401 /* Locally created ad-hoc BSSs won't have beacons if this is the
1402 * only station in the adhoc network; so get signal strength
1403 * from receive statistics.
1404 */
1405 if ((adapter->mode == IW_MODE_ADHOC)
1406 && adapter->adhoccreate
1407 && !libertas_ssid_cmp(adapter->curbssparams.ssid,
1408 adapter->curbssparams.ssid_len,
1409 bss->ssid, bss->ssid_len)) {
1410 int snr, nf;
1411 snr = adapter->SNR[TYPE_RXPD][TYPE_AVG] / AVG_SCALE;
1412 nf = adapter->NF[TYPE_RXPD][TYPE_AVG] / AVG_SCALE;
1413 iwe.u.qual.level = CAL_RSSI(snr, nf);
1414 }
1415 start = iwe_stream_add_event(start, stop, &iwe, IW_EV_QUAL_LEN);
1416
1417 /* Add encryption capability */
1418 iwe.cmd = SIOCGIWENCODE;
1419 if (bss->capability & WLAN_CAPABILITY_PRIVACY) {
1420 iwe.u.data.flags = IW_ENCODE_ENABLED | IW_ENCODE_NOKEY;
1421 } else {
1422 iwe.u.data.flags = IW_ENCODE_DISABLED;
1423 }
1424 iwe.u.data.length = 0;
1425 start = iwe_stream_add_point(start, stop, &iwe, bss->ssid);
1426
1427 current_val = start + IW_EV_LCP_LEN;
1428
1429 iwe.cmd = SIOCGIWRATE;
1430 iwe.u.bitrate.fixed = 0;
1431 iwe.u.bitrate.disabled = 0;
1432 iwe.u.bitrate.value = 0;
1433
1434 for (j = 0; bss->rates[j] && (j < sizeof(bss->rates)); j++) {
1435 /* Bit rate given in 500 kb/s units */
1436 iwe.u.bitrate.value = bss->rates[j] * 500000;
1437 current_val = iwe_stream_add_value(start, current_val,
1438 stop, &iwe, IW_EV_PARAM_LEN);
1439 }
1440 if ((bss->mode == IW_MODE_ADHOC)
1441 && !libertas_ssid_cmp(adapter->curbssparams.ssid,
1442 adapter->curbssparams.ssid_len,
1443 bss->ssid, bss->ssid_len)
1444 && adapter->adhoccreate) {
1445 iwe.u.bitrate.value = 22 * 500000;
1446 current_val = iwe_stream_add_value(start, current_val,
1447 stop, &iwe, IW_EV_PARAM_LEN);
1448 }
1449 /* Check if we added any event */
1450 if((current_val - start) > IW_EV_LCP_LEN)
1451 start = current_val;
1452
1453 memset(&iwe, 0, sizeof(iwe));
1454 if (bss->wpa_ie_len) {
1455 char buf[MAX_WPA_IE_LEN];
1456 memcpy(buf, bss->wpa_ie, bss->wpa_ie_len);
1457 iwe.cmd = IWEVGENIE;
1458 iwe.u.data.length = bss->wpa_ie_len;
1459 start = iwe_stream_add_point(start, stop, &iwe, buf);
1460 }
1461
1462 memset(&iwe, 0, sizeof(iwe));
1463 if (bss->rsn_ie_len) {
1464 char buf[MAX_WPA_IE_LEN];
1465 memcpy(buf, bss->rsn_ie, bss->rsn_ie_len);
1466 iwe.cmd = IWEVGENIE;
1467 iwe.u.data.length = bss->rsn_ie_len;
1468 start = iwe_stream_add_point(start, stop, &iwe, buf);
1469 }
1470
1471 return start;
1472 }
1473
1474 /**
1475 * @brief Retrieve the scan table entries via wireless tools IOCTL call
1476 *
1477 * @param dev A pointer to net_device structure
1478 * @param info A pointer to iw_request_info structure
1479 * @param dwrq A pointer to iw_point structure
1480 * @param extra A pointer to extra data buf
1481 *
1482 * @return 0 --success, otherwise fail
1483 */
1484 int libertas_get_scan(struct net_device *dev, struct iw_request_info *info,
1485 struct iw_point *dwrq, char *extra)
1486 {
1487 #define SCAN_ITEM_SIZE 128
1488 wlan_private *priv = dev->priv;
1489 wlan_adapter *adapter = priv->adapter;
1490 int err = 0;
1491 char *ev = extra;
1492 char *stop = ev + dwrq->length;
1493 struct bss_descriptor * iter_bss;
1494 struct bss_descriptor * safe;
1495
1496 lbs_deb_enter(LBS_DEB_ASSOC);
1497
1498 /* If we've got an uncompleted scan, schedule the next part */
1499 if (!adapter->nr_cmd_pending && adapter->last_scanned_channel)
1500 wlan_scan_networks(priv, NULL, 0);
1501
1502 /* Update RSSI if current BSS is a locally created ad-hoc BSS */
1503 if ((adapter->mode == IW_MODE_ADHOC) && adapter->adhoccreate) {
1504 libertas_prepare_and_send_command(priv, CMD_802_11_RSSI, 0,
1505 CMD_OPTION_WAITFORRSP, 0, NULL);
1506 }
1507
1508 mutex_lock(&adapter->lock);
1509 list_for_each_entry_safe (iter_bss, safe, &adapter->network_list, list) {
1510 char * next_ev;
1511 unsigned long stale_time;
1512
1513 if (stop - ev < SCAN_ITEM_SIZE) {
1514 err = -E2BIG;
1515 break;
1516 }
1517
1518 /* For mesh device, list only mesh networks */
1519 if (dev == priv->mesh_dev && !iter_bss->mesh)
1520 continue;
1521
1522 /* Prune old an old scan result */
1523 stale_time = iter_bss->last_scanned + DEFAULT_MAX_SCAN_AGE;
1524 if (time_after(jiffies, stale_time)) {
1525 list_move_tail (&iter_bss->list,
1526 &adapter->network_free_list);
1527 clear_bss_descriptor(iter_bss);
1528 continue;
1529 }
1530
1531 /* Translate to WE format this entry */
1532 next_ev = libertas_translate_scan(priv, ev, stop, iter_bss);
1533 if (next_ev == NULL)
1534 continue;
1535 ev = next_ev;
1536 }
1537 mutex_unlock(&adapter->lock);
1538
1539 dwrq->length = (ev - extra);
1540 dwrq->flags = 0;
1541
1542 lbs_deb_leave(LBS_DEB_ASSOC);
1543 return err;
1544 }
1545
1546 /**
1547 * @brief Prepare a scan command to be sent to the firmware
1548 *
1549 * Use the wlan_scan_cmd_config sent to the command processing module in
1550 * the libertas_prepare_and_send_command to configure a cmd_ds_802_11_scan command
1551 * struct to send to firmware.
1552 *
1553 * The fixed fields specifying the BSS type and BSSID filters as well as a
1554 * variable number/length of TLVs are sent in the command to firmware.
1555 *
1556 * @param priv A pointer to wlan_private structure
1557 * @param cmd A pointer to cmd_ds_command structure to be sent to
1558 * firmware with the cmd_DS_801_11_SCAN structure
1559 * @param pdata_buf Void pointer cast of a wlan_scan_cmd_config struct used
1560 * to set the fields/TLVs for the command sent to firmware
1561 *
1562 * @return 0 or -1
1563 *
1564 * @sa wlan_scan_create_channel_list
1565 */
1566 int libertas_cmd_80211_scan(wlan_private * priv,
1567 struct cmd_ds_command *cmd, void *pdata_buf)
1568 {
1569 struct cmd_ds_802_11_scan *pscan = &cmd->params.scan;
1570 struct wlan_scan_cmd_config *pscancfg;
1571
1572 lbs_deb_enter(LBS_DEB_ASSOC);
1573
1574 pscancfg = pdata_buf;
1575
1576 /* Set fixed field variables in scan command */
1577 pscan->bsstype = pscancfg->bsstype;
1578 memcpy(pscan->bssid, pscancfg->bssid, ETH_ALEN);
1579 memcpy(pscan->tlvbuffer, pscancfg->tlvbuffer, pscancfg->tlvbufferlen);
1580
1581 cmd->command = cpu_to_le16(CMD_802_11_SCAN);
1582
1583 /* size is equal to the sizeof(fixed portions) + the TLV len + header */
1584 cmd->size = cpu_to_le16(sizeof(pscan->bsstype) + ETH_ALEN
1585 + pscancfg->tlvbufferlen + S_DS_GEN);
1586
1587 lbs_deb_scan("SCAN_CMD: command=%x, size=%x, seqnum=%x\n",
1588 le16_to_cpu(cmd->command), le16_to_cpu(cmd->size),
1589 le16_to_cpu(cmd->seqnum));
1590
1591 lbs_deb_leave(LBS_DEB_ASSOC);
1592 return 0;
1593 }
1594
1595 static inline int is_same_network(struct bss_descriptor *src,
1596 struct bss_descriptor *dst)
1597 {
1598 /* A network is only a duplicate if the channel, BSSID, and ESSID
1599 * all match. We treat all <hidden> with the same BSSID and channel
1600 * as one network */
1601 return ((src->ssid_len == dst->ssid_len) &&
1602 (src->channel == dst->channel) &&
1603 !compare_ether_addr(src->bssid, dst->bssid) &&
1604 !memcmp(src->ssid, dst->ssid, src->ssid_len));
1605 }
1606
1607 /**
1608 * @brief This function handles the command response of scan
1609 *
1610 * The response buffer for the scan command has the following
1611 * memory layout:
1612 *
1613 * .-----------------------------------------------------------.
1614 * | header (4 * sizeof(u16)): Standard command response hdr |
1615 * .-----------------------------------------------------------.
1616 * | bufsize (u16) : sizeof the BSS Description data |
1617 * .-----------------------------------------------------------.
1618 * | NumOfSet (u8) : Number of BSS Descs returned |
1619 * .-----------------------------------------------------------.
1620 * | BSSDescription data (variable, size given in bufsize) |
1621 * .-----------------------------------------------------------.
1622 * | TLV data (variable, size calculated using header->size, |
1623 * | bufsize and sizeof the fixed fields above) |
1624 * .-----------------------------------------------------------.
1625 *
1626 * @param priv A pointer to wlan_private structure
1627 * @param resp A pointer to cmd_ds_command
1628 *
1629 * @return 0 or -1
1630 */
1631 int libertas_ret_80211_scan(wlan_private * priv, struct cmd_ds_command *resp)
1632 {
1633 wlan_adapter *adapter = priv->adapter;
1634 struct cmd_ds_802_11_scan_rsp *pscan;
1635 struct bss_descriptor * iter_bss;
1636 struct bss_descriptor * safe;
1637 u8 *pbssinfo;
1638 u16 scanrespsize;
1639 int bytesleft;
1640 int idx;
1641 int tlvbufsize;
1642 int ret;
1643
1644 lbs_deb_enter(LBS_DEB_ASSOC);
1645
1646 /* Prune old entries from scan table */
1647 list_for_each_entry_safe (iter_bss, safe, &adapter->network_list, list) {
1648 unsigned long stale_time = iter_bss->last_scanned + DEFAULT_MAX_SCAN_AGE;
1649 if (time_before(jiffies, stale_time))
1650 continue;
1651 list_move_tail (&iter_bss->list, &adapter->network_free_list);
1652 clear_bss_descriptor(iter_bss);
1653 }
1654
1655 pscan = &resp->params.scanresp;
1656
1657 if (pscan->nr_sets > MAX_NETWORK_COUNT) {
1658 lbs_deb_scan(
1659 "SCAN_RESP: too many scan results (%d, max %d)!!\n",
1660 pscan->nr_sets, MAX_NETWORK_COUNT);
1661 ret = -1;
1662 goto done;
1663 }
1664
1665 bytesleft = le16_to_cpu(pscan->bssdescriptsize);
1666 lbs_deb_scan("SCAN_RESP: bssdescriptsize %d\n", bytesleft);
1667
1668 scanrespsize = le16_to_cpu(resp->size);
1669 lbs_deb_scan("SCAN_RESP: returned %d AP before parsing\n",
1670 pscan->nr_sets);
1671
1672 pbssinfo = pscan->bssdesc_and_tlvbuffer;
1673
1674 /* The size of the TLV buffer is equal to the entire command response
1675 * size (scanrespsize) minus the fixed fields (sizeof()'s), the
1676 * BSS Descriptions (bssdescriptsize as bytesLef) and the command
1677 * response header (S_DS_GEN)
1678 */
1679 tlvbufsize = scanrespsize - (bytesleft + sizeof(pscan->bssdescriptsize)
1680 + sizeof(pscan->nr_sets)
1681 + S_DS_GEN);
1682
1683 /*
1684 * Process each scan response returned (pscan->nr_sets). Save
1685 * the information in the newbssentry and then insert into the
1686 * driver scan table either as an update to an existing entry
1687 * or as an addition at the end of the table
1688 */
1689 for (idx = 0; idx < pscan->nr_sets && bytesleft; idx++) {
1690 struct bss_descriptor new;
1691 struct bss_descriptor * found = NULL;
1692 struct bss_descriptor * oldest = NULL;
1693
1694 /* Process the data fields and IEs returned for this BSS */
1695 memset(&new, 0, sizeof (struct bss_descriptor));
1696 if (libertas_process_bss(&new, &pbssinfo, &bytesleft) != 0) {
1697 /* error parsing the scan response, skipped */
1698 lbs_deb_scan("SCAN_RESP: process_bss returned ERROR\n");
1699 continue;
1700 }
1701
1702 /* Try to find this bss in the scan table */
1703 list_for_each_entry (iter_bss, &adapter->network_list, list) {
1704 if (is_same_network(iter_bss, &new)) {
1705 found = iter_bss;
1706 break;
1707 }
1708
1709 if ((oldest == NULL) ||
1710 (iter_bss->last_scanned < oldest->last_scanned))
1711 oldest = iter_bss;
1712 }
1713
1714 if (found) {
1715 /* found, clear it */
1716 clear_bss_descriptor(found);
1717 } else if (!list_empty(&adapter->network_free_list)) {
1718 /* Pull one from the free list */
1719 found = list_entry(adapter->network_free_list.next,
1720 struct bss_descriptor, list);
1721 list_move_tail(&found->list, &adapter->network_list);
1722 } else if (oldest) {
1723 /* If there are no more slots, expire the oldest */
1724 found = oldest;
1725 clear_bss_descriptor(found);
1726 list_move_tail(&found->list, &adapter->network_list);
1727 } else {
1728 continue;
1729 }
1730
1731 lbs_deb_scan("SCAN_RESP: BSSID = " MAC_FMT "\n",
1732 new.bssid[0], new.bssid[1], new.bssid[2],
1733 new.bssid[3], new.bssid[4], new.bssid[5]);
1734
1735 /* Copy the locally created newbssentry to the scan table */
1736 memcpy(found, &new, offsetof(struct bss_descriptor, list));
1737 }
1738
1739 ret = 0;
1740
1741 done:
1742 lbs_deb_leave_args(LBS_DEB_SCAN, "ret %d", ret);
1743 return ret;
1744 }
Stable & featurefull patchset based on Linus's git branch