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[ARM] pxa: Gumstix Verdex PCMCIA support
[linux-2.6/verdex.git] / drivers / net / wireless / libertas / scan.c
blob6c95af3023ccf366897726c5fa460a3d5933d72f
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/types.h>
8 #include <linux/kernel.h>
9 #include <linux/etherdevice.h>
10 #include <linux/if_arp.h>
11 #include <asm/unaligned.h>
12 #include <net/lib80211.h>
13
14 #include "host.h"
15 #include "decl.h"
16 #include "dev.h"
17 #include "scan.h"
18 #include "cmd.h"
19
20 //! Approximate amount of data needed to pass a scan result back to iwlist
21 #define MAX_SCAN_CELL_SIZE (IW_EV_ADDR_LEN \
22 + IW_ESSID_MAX_SIZE \
23 + IW_EV_UINT_LEN \
24 + IW_EV_FREQ_LEN \
25 + IW_EV_QUAL_LEN \
26 + IW_ESSID_MAX_SIZE \
27 + IW_EV_PARAM_LEN \
28 + 40) /* 40 for WPAIE */
29
30 //! Memory needed to store a max sized channel List TLV for a firmware scan
31 #define CHAN_TLV_MAX_SIZE (sizeof(struct mrvl_ie_header) \
32 + (MRVDRV_MAX_CHANNELS_PER_SCAN \
33 * sizeof(struct chanscanparamset)))
34
35 //! Memory needed to store a max number/size SSID TLV for a firmware scan
36 #define SSID_TLV_MAX_SIZE (1 * sizeof(struct mrvl_ie_ssid_param_set))
37
38 //! Maximum memory needed for a cmd_ds_802_11_scan with all TLVs at max
39 #define MAX_SCAN_CFG_ALLOC (sizeof(struct cmd_ds_802_11_scan) \
40 + CHAN_TLV_MAX_SIZE + SSID_TLV_MAX_SIZE)
41
42 //! The maximum number of channels the firmware can scan per command
43 #define MRVDRV_MAX_CHANNELS_PER_SCAN 14
44
45 /**
46 * @brief Number of channels to scan per firmware scan command issuance.
47 *
48 * Number restricted to prevent hitting the limit on the amount of scan data
49 * returned in a single firmware scan command.
50 */
51 #define MRVDRV_CHANNELS_PER_SCAN_CMD 4
52
53 //! Scan time specified in the channel TLV for each channel for passive scans
54 #define MRVDRV_PASSIVE_SCAN_CHAN_TIME 100
55
56 //! Scan time specified in the channel TLV for each channel for active scans
57 #define MRVDRV_ACTIVE_SCAN_CHAN_TIME 100
58
59 #define DEFAULT_MAX_SCAN_AGE (15 * HZ)
60
61 static int lbs_ret_80211_scan(struct lbs_private *priv, unsigned long dummy,
62 struct cmd_header *resp);
63
64 /*********************************************************************/
65 /* */
66 /* Misc helper functions */
67 /* */
68 /*********************************************************************/
69
70 /**
71 * @brief Unsets the MSB on basic rates
72 *
73 * Scan through an array and unset the MSB for basic data rates.
74 *
75 * @param rates buffer of data rates
76 * @param len size of buffer
77 */
78 static void lbs_unset_basic_rate_flags(u8 *rates, size_t len)
79 {
80 int i;
81
82 for (i = 0; i < len; i++)
83 rates[i] &= 0x7f;
84 }
85
86
87 static inline void clear_bss_descriptor(struct bss_descriptor *bss)
88 {
89 /* Don't blow away ->list, just BSS data */
90 memset(bss, 0, offsetof(struct bss_descriptor, list));
91 }
92
93 /**
94 * @brief Compare two SSIDs
95 *
96 * @param ssid1 A pointer to ssid to compare
97 * @param ssid2 A pointer to ssid to compare
98 *
99 * @return 0: ssid is same, otherwise is different
100 */
101 int lbs_ssid_cmp(uint8_t *ssid1, uint8_t ssid1_len, uint8_t *ssid2,
102 uint8_t ssid2_len)
103 {
104 if (ssid1_len != ssid2_len)
105 return -1;
106
107 return memcmp(ssid1, ssid2, ssid1_len);
108 }
109
110 static inline int is_same_network(struct bss_descriptor *src,
111 struct bss_descriptor *dst)
112 {
113 /* A network is only a duplicate if the channel, BSSID, and ESSID
114 * all match. We treat all <hidden> with the same BSSID and channel
115 * as one network */
116 return ((src->ssid_len == dst->ssid_len) &&
117 (src->channel == dst->channel) &&
118 !compare_ether_addr(src->bssid, dst->bssid) &&
119 !memcmp(src->ssid, dst->ssid, src->ssid_len));
120 }
121
122
123
124
125 /*********************************************************************/
126 /* */
127 /* Main scanning support */
128 /* */
129 /*********************************************************************/
130
131 /**
132 * @brief Create a channel list for the driver to scan based on region info
133 *
134 * Only used from lbs_scan_setup_scan_config()
135 *
136 * Use the driver region/band information to construct a comprehensive list
137 * of channels to scan. This routine is used for any scan that is not
138 * provided a specific channel list to scan.
139 *
140 * @param priv A pointer to struct lbs_private structure
141 * @param scanchanlist Output parameter: resulting channel list to scan
142 *
143 * @return void
144 */
145 static int lbs_scan_create_channel_list(struct lbs_private *priv,
146 struct chanscanparamset *scanchanlist)
147 {
148 struct region_channel *scanregion;
149 struct chan_freq_power *cfp;
150 int rgnidx;
151 int chanidx;
152 int nextchan;
153 uint8_t scantype;
154
155 chanidx = 0;
156
157 /* Set the default scan type to the user specified type, will later
158 * be changed to passive on a per channel basis if restricted by
159 * regulatory requirements (11d or 11h)
160 */
161 scantype = CMD_SCAN_TYPE_ACTIVE;
162
163 for (rgnidx = 0; rgnidx < ARRAY_SIZE(priv->region_channel); rgnidx++) {
164 if (priv->enable11d && (priv->connect_status != LBS_CONNECTED)
165 && (priv->mesh_connect_status != LBS_CONNECTED)) {
166 /* Scan all the supported chan for the first scan */
167 if (!priv->universal_channel[rgnidx].valid)
168 continue;
169 scanregion = &priv->universal_channel[rgnidx];
170
171 /* clear the parsed_region_chan for the first scan */
172 memset(&priv->parsed_region_chan, 0x00,
173 sizeof(priv->parsed_region_chan));
174 } else {
175 if (!priv->region_channel[rgnidx].valid)
176 continue;
177 scanregion = &priv->region_channel[rgnidx];
178 }
179
180 for (nextchan = 0; nextchan < scanregion->nrcfp; nextchan++, chanidx++) {
181 struct chanscanparamset *chan = &scanchanlist[chanidx];
182
183 cfp = scanregion->CFP + nextchan;
184
185 if (priv->enable11d)
186 scantype = lbs_get_scan_type_11d(cfp->channel,
187 &priv->parsed_region_chan);
188
189 if (scanregion->band == BAND_B || scanregion->band == BAND_G)
190 chan->radiotype = CMD_SCAN_RADIO_TYPE_BG;
191
192 if (scantype == CMD_SCAN_TYPE_PASSIVE) {
193 chan->maxscantime = cpu_to_le16(MRVDRV_PASSIVE_SCAN_CHAN_TIME);
194 chan->chanscanmode.passivescan = 1;
195 } else {
196 chan->maxscantime = cpu_to_le16(MRVDRV_ACTIVE_SCAN_CHAN_TIME);
197 chan->chanscanmode.passivescan = 0;
198 }
199
200 chan->channumber = cfp->channel;
201 }
202 }
203 return chanidx;
204 }
205
206 /*
207 * Add SSID TLV of the form:
208 *
209 * TLV-ID SSID 00 00
210 * length 06 00
211 * ssid 4d 4e 54 45 53 54
212 */
213 static int lbs_scan_add_ssid_tlv(struct lbs_private *priv, u8 *tlv)
214 {
215 struct mrvl_ie_ssid_param_set *ssid_tlv = (void *)tlv;
216
217 ssid_tlv->header.type = cpu_to_le16(TLV_TYPE_SSID);
218 ssid_tlv->header.len = cpu_to_le16(priv->scan_ssid_len);
219 memcpy(ssid_tlv->ssid, priv->scan_ssid, priv->scan_ssid_len);
220 return sizeof(ssid_tlv->header) + priv->scan_ssid_len;
221 }
222
223 /*
224 * Add CHANLIST TLV of the form
225 *
226 * TLV-ID CHANLIST 01 01
227 * length 5b 00
228 * channel 1 00 01 00 00 00 64 00
229 * radio type 00
230 * channel 01
231 * scan type 00
232 * min scan time 00 00
233 * max scan time 64 00
234 * channel 2 00 02 00 00 00 64 00
235 * channel 3 00 03 00 00 00 64 00
236 * channel 4 00 04 00 00 00 64 00
237 * channel 5 00 05 00 00 00 64 00
238 * channel 6 00 06 00 00 00 64 00
239 * channel 7 00 07 00 00 00 64 00
240 * channel 8 00 08 00 00 00 64 00
241 * channel 9 00 09 00 00 00 64 00
242 * channel 10 00 0a 00 00 00 64 00
243 * channel 11 00 0b 00 00 00 64 00
244 * channel 12 00 0c 00 00 00 64 00
245 * channel 13 00 0d 00 00 00 64 00
246 *
247 */
248 static int lbs_scan_add_chanlist_tlv(uint8_t *tlv,
249 struct chanscanparamset *chan_list,
250 int chan_count)
251 {
252 size_t size = sizeof(struct chanscanparamset) *chan_count;
253 struct mrvl_ie_chanlist_param_set *chan_tlv = (void *)tlv;
254
255 chan_tlv->header.type = cpu_to_le16(TLV_TYPE_CHANLIST);
256 memcpy(chan_tlv->chanscanparam, chan_list, size);
257 chan_tlv->header.len = cpu_to_le16(size);
258 return sizeof(chan_tlv->header) + size;
259 }
260
261 /*
262 * Add RATES TLV of the form
263 *
264 * TLV-ID RATES 01 00
265 * length 0e 00
266 * rates 82 84 8b 96 0c 12 18 24 30 48 60 6c
267 *
268 * The rates are in lbs_bg_rates[], but for the 802.11b
269 * rates the high bit isn't set.
270 */
271 static int lbs_scan_add_rates_tlv(uint8_t *tlv)
272 {
273 int i;
274 struct mrvl_ie_rates_param_set *rate_tlv = (void *)tlv;
275
276 rate_tlv->header.type = cpu_to_le16(TLV_TYPE_RATES);
277 tlv += sizeof(rate_tlv->header);
278 for (i = 0; i < MAX_RATES; i++) {
279 *tlv = lbs_bg_rates[i];
280 if (*tlv == 0)
281 break;
282 /* This code makes sure that the 802.11b rates (1 MBit/s, 2
283 MBit/s, 5.5 MBit/s and 11 MBit/s get's the high bit set.
284 Note that the values are MBit/s * 2, to mark them as
285 basic rates so that the firmware likes it better */
286 if (*tlv == 0x02 || *tlv == 0x04 ||
287 *tlv == 0x0b || *tlv == 0x16)
288 *tlv |= 0x80;
289 tlv++;
290 }
291 rate_tlv->header.len = cpu_to_le16(i);
292 return sizeof(rate_tlv->header) + i;
293 }
294
295 /*
296 * Generate the CMD_802_11_SCAN command with the proper tlv
297 * for a bunch of channels.
298 */
299 static int lbs_do_scan(struct lbs_private *priv, uint8_t bsstype,
300 struct chanscanparamset *chan_list, int chan_count)
301 {
302 int ret = -ENOMEM;
303 struct cmd_ds_802_11_scan *scan_cmd;
304 uint8_t *tlv; /* pointer into our current, growing TLV storage area */
305
306 lbs_deb_enter_args(LBS_DEB_SCAN, "bsstype %d, chanlist[].chan %d, chan_count %d",
307 bsstype, chan_list ? chan_list[0].channumber : -1,
308 chan_count);
309
310 /* create the fixed part for scan command */
311 scan_cmd = kzalloc(MAX_SCAN_CFG_ALLOC, GFP_KERNEL);
312 if (scan_cmd == NULL)
313 goto out;
314
315 tlv = scan_cmd->tlvbuffer;
316 /* TODO: do we need to scan for a specific BSSID?
317 memcpy(scan_cmd->bssid, priv->scan_bssid, ETH_ALEN); */
318 scan_cmd->bsstype = bsstype;
319
320 /* add TLVs */
321 if (priv->scan_ssid_len)
322 tlv += lbs_scan_add_ssid_tlv(priv, tlv);
323 if (chan_list && chan_count)
324 tlv += lbs_scan_add_chanlist_tlv(tlv, chan_list, chan_count);
325 tlv += lbs_scan_add_rates_tlv(tlv);
326
327 /* This is the final data we are about to send */
328 scan_cmd->hdr.size = cpu_to_le16(tlv - (uint8_t *)scan_cmd);
329 lbs_deb_hex(LBS_DEB_SCAN, "SCAN_CMD", (void *)scan_cmd,
330 sizeof(*scan_cmd));
331 lbs_deb_hex(LBS_DEB_SCAN, "SCAN_TLV", scan_cmd->tlvbuffer,
332 tlv - scan_cmd->tlvbuffer);
333
334 ret = __lbs_cmd(priv, CMD_802_11_SCAN, &scan_cmd->hdr,
335 le16_to_cpu(scan_cmd->hdr.size),
336 lbs_ret_80211_scan, 0);
337
338 out:
339 kfree(scan_cmd);
340 lbs_deb_leave_args(LBS_DEB_SCAN, "ret %d", ret);
341 return ret;
342 }
343
344 /**
345 * @brief Internal function used to start a scan based on an input config
346 *
347 * Use the input user scan configuration information when provided in
348 * order to send the appropriate scan commands to firmware to populate or
349 * update the internal driver scan table
350 *
351 * @param priv A pointer to struct lbs_private structure
352 * @param full_scan Do a full-scan (blocking)
353 *
354 * @return 0 or < 0 if error
355 */
356 int lbs_scan_networks(struct lbs_private *priv, int full_scan)
357 {
358 int ret = -ENOMEM;
359 struct chanscanparamset *chan_list;
360 struct chanscanparamset *curr_chans;
361 int chan_count;
362 uint8_t bsstype = CMD_BSS_TYPE_ANY;
363 int numchannels = MRVDRV_CHANNELS_PER_SCAN_CMD;
364 union iwreq_data wrqu;
365 #ifdef CONFIG_LIBERTAS_DEBUG
366 struct bss_descriptor *iter;
367 int i = 0;
368 DECLARE_SSID_BUF(ssid);
369 #endif
370
371 lbs_deb_enter_args(LBS_DEB_SCAN, "full_scan %d", full_scan);
372
373 /* Cancel any partial outstanding partial scans if this scan
374 * is a full scan.
375 */
376 if (full_scan && delayed_work_pending(&priv->scan_work))
377 cancel_delayed_work(&priv->scan_work);
378
379 /* User-specified bsstype or channel list
380 TODO: this can be implemented if some user-space application
381 need the feature. Formerly, it was accessible from debugfs,
382 but then nowhere used.
383 if (user_cfg) {
384 if (user_cfg->bsstype)
385 bsstype = user_cfg->bsstype;
386 } */
387
388 lbs_deb_scan("numchannels %d, bsstype %d\n", numchannels, bsstype);
389
390 /* Create list of channels to scan */
391 chan_list = kzalloc(sizeof(struct chanscanparamset) *
392 LBS_IOCTL_USER_SCAN_CHAN_MAX, GFP_KERNEL);
393 if (!chan_list) {
394 lbs_pr_alert("SCAN: chan_list empty\n");
395 goto out;
396 }
397
398 /* We want to scan all channels */
399 chan_count = lbs_scan_create_channel_list(priv, chan_list);
400
401 netif_stop_queue(priv->dev);
402 netif_carrier_off(priv->dev);
403 if (priv->mesh_dev) {
404 netif_stop_queue(priv->mesh_dev);
405 netif_carrier_off(priv->mesh_dev);
406 }
407
408 /* Prepare to continue an interrupted scan */
409 lbs_deb_scan("chan_count %d, scan_channel %d\n",
410 chan_count, priv->scan_channel);
411 curr_chans = chan_list;
412 /* advance channel list by already-scanned-channels */
413 if (priv->scan_channel > 0) {
414 curr_chans += priv->scan_channel;
415 chan_count -= priv->scan_channel;
416 }
417
418 /* Send scan command(s)
419 * numchannels contains the number of channels we should maximally scan
420 * chan_count is the total number of channels to scan
421 */
422
423 while (chan_count) {
424 int to_scan = min(numchannels, chan_count);
425 lbs_deb_scan("scanning %d of %d channels\n",
426 to_scan, chan_count);
427 ret = lbs_do_scan(priv, bsstype, curr_chans,
428 to_scan);
429 if (ret) {
430 lbs_pr_err("SCAN_CMD failed\n");
431 goto out2;
432 }
433 curr_chans += to_scan;
434 chan_count -= to_scan;
435
436 /* somehow schedule the next part of the scan */
437 if (chan_count && !full_scan &&
438 !priv->surpriseremoved) {
439 /* -1 marks just that we're currently scanning */
440 if (priv->scan_channel < 0)
441 priv->scan_channel = to_scan;
442 else
443 priv->scan_channel += to_scan;
444 cancel_delayed_work(&priv->scan_work);
445 queue_delayed_work(priv->work_thread, &priv->scan_work,
446 msecs_to_jiffies(300));
447 /* skip over GIWSCAN event */
448 goto out;
449 }
450
451 }
452 memset(&wrqu, 0, sizeof(union iwreq_data));
453 wireless_send_event(priv->dev, SIOCGIWSCAN, &wrqu, NULL);
454
455 #ifdef CONFIG_LIBERTAS_DEBUG
456 /* Dump the scan table */
457 mutex_lock(&priv->lock);
458 lbs_deb_scan("scan table:\n");
459 list_for_each_entry(iter, &priv->network_list, list)
460 lbs_deb_scan("%02d: BSSID %pM, RSSI %d, SSID '%s'\n",
461 i++, iter->bssid, iter->rssi,
462 print_ssid(ssid, iter->ssid, iter->ssid_len));
463 mutex_unlock(&priv->lock);
464 #endif
465
466 out2:
467 priv->scan_channel = 0;
468
469 out:
470 if (priv->connect_status == LBS_CONNECTED) {
471 netif_carrier_on(priv->dev);
472 if (!priv->tx_pending_len)
473 netif_wake_queue(priv->dev);
474 }
475 if (priv->mesh_dev && (priv->mesh_connect_status == LBS_CONNECTED)) {
476 netif_carrier_on(priv->mesh_dev);
477 if (!priv->tx_pending_len)
478 netif_wake_queue(priv->mesh_dev);
479 }
480 kfree(chan_list);
481
482 lbs_deb_leave_args(LBS_DEB_SCAN, "ret %d", ret);
483 return ret;
484 }
485
486 void lbs_scan_worker(struct work_struct *work)
487 {
488 struct lbs_private *priv =
489 container_of(work, struct lbs_private, scan_work.work);
490
491 lbs_deb_enter(LBS_DEB_SCAN);
492 lbs_scan_networks(priv, 0);
493 lbs_deb_leave(LBS_DEB_SCAN);
494 }
495
496
497 /*********************************************************************/
498 /* */
499 /* Result interpretation */
500 /* */
501 /*********************************************************************/
502
503 /**
504 * @brief Interpret a BSS scan response returned from the firmware
505 *
506 * Parse the various fixed fields and IEs passed back for a a BSS probe
507 * response or beacon from the scan command. Record information as needed
508 * in the scan table struct bss_descriptor for that entry.
509 *
510 * @param bss Output parameter: Pointer to the BSS Entry
511 *
512 * @return 0 or -1
513 */
514 static int lbs_process_bss(struct bss_descriptor *bss,
515 uint8_t **pbeaconinfo, int *bytesleft)
516 {
517 struct ieee_ie_fh_param_set *fh;
518 struct ieee_ie_ds_param_set *ds;
519 struct ieee_ie_cf_param_set *cf;
520 struct ieee_ie_ibss_param_set *ibss;
521 DECLARE_SSID_BUF(ssid);
522 struct ieee_ie_country_info_set *pcountryinfo;
523 uint8_t *pos, *end, *p;
524 uint8_t n_ex_rates = 0, got_basic_rates = 0, n_basic_rates = 0;
525 uint16_t beaconsize = 0;
526 int ret;
527
528 lbs_deb_enter(LBS_DEB_SCAN);
529
530 if (*bytesleft >= sizeof(beaconsize)) {
531 /* Extract & convert beacon size from the command buffer */
532 beaconsize = get_unaligned_le16(*pbeaconinfo);
533 *bytesleft -= sizeof(beaconsize);
534 *pbeaconinfo += sizeof(beaconsize);
535 }
536
537 if (beaconsize == 0 || beaconsize > *bytesleft) {
538 *pbeaconinfo += *bytesleft;
539 *bytesleft = 0;
540 ret = -1;
541 goto done;
542 }
543
544 /* Initialize the current working beacon pointer for this BSS iteration */
545 pos = *pbeaconinfo;
546 end = pos + beaconsize;
547
548 /* Advance the return beacon pointer past the current beacon */
549 *pbeaconinfo += beaconsize;
550 *bytesleft -= beaconsize;
551
552 memcpy(bss->bssid, pos, ETH_ALEN);
553 lbs_deb_scan("process_bss: BSSID %pM\n", bss->bssid);
554 pos += ETH_ALEN;
555
556 if ((end - pos) < 12) {
557 lbs_deb_scan("process_bss: Not enough bytes left\n");
558 ret = -1;
559 goto done;
560 }
561
562 /*
563 * next 4 fields are RSSI, time stamp, beacon interval,
564 * and capability information
565 */
566
567 /* RSSI is 1 byte long */
568 bss->rssi = *pos;
569 lbs_deb_scan("process_bss: RSSI %d\n", *pos);
570 pos++;
571
572 /* time stamp is 8 bytes long */
573 pos += 8;
574
575 /* beacon interval is 2 bytes long */
576 bss->beaconperiod = get_unaligned_le16(pos);
577 pos += 2;
578
579 /* capability information is 2 bytes long */
580 bss->capability = get_unaligned_le16(pos);
581 lbs_deb_scan("process_bss: capabilities 0x%04x\n", bss->capability);
582 pos += 2;
583
584 if (bss->capability & WLAN_CAPABILITY_PRIVACY)
585 lbs_deb_scan("process_bss: WEP enabled\n");
586 if (bss->capability & WLAN_CAPABILITY_IBSS)
587 bss->mode = IW_MODE_ADHOC;
588 else
589 bss->mode = IW_MODE_INFRA;
590
591 /* rest of the current buffer are IE's */
592 lbs_deb_scan("process_bss: IE len %zd\n", end - pos);
593 lbs_deb_hex(LBS_DEB_SCAN, "process_bss: IE info", pos, end - pos);
594
595 /* process variable IE */
596 while (pos <= end - 2) {
597 if (pos + pos[1] > end) {
598 lbs_deb_scan("process_bss: error in processing IE, "
599 "bytes left < IE length\n");
600 break;
601 }
602
603 switch (pos[0]) {
604 case WLAN_EID_SSID:
605 bss->ssid_len = min_t(int, IEEE80211_MAX_SSID_LEN, pos[1]);
606 memcpy(bss->ssid, pos + 2, bss->ssid_len);
607 lbs_deb_scan("got SSID IE: '%s', len %u\n",
608 print_ssid(ssid, bss->ssid, bss->ssid_len),
609 bss->ssid_len);
610 break;
611
612 case WLAN_EID_SUPP_RATES:
613 n_basic_rates = min_t(uint8_t, MAX_RATES, pos[1]);
614 memcpy(bss->rates, pos + 2, n_basic_rates);
615 got_basic_rates = 1;
616 lbs_deb_scan("got RATES IE\n");
617 break;
618
619 case WLAN_EID_FH_PARAMS:
620 fh = (struct ieee_ie_fh_param_set *) pos;
621 memcpy(&bss->phy.fh, fh, sizeof(*fh));
622 lbs_deb_scan("got FH IE\n");
623 break;
624
625 case WLAN_EID_DS_PARAMS:
626 ds = (struct ieee_ie_ds_param_set *) pos;
627 bss->channel = ds->channel;
628 memcpy(&bss->phy.ds, ds, sizeof(*ds));
629 lbs_deb_scan("got DS IE, channel %d\n", bss->channel);
630 break;
631
632 case WLAN_EID_CF_PARAMS:
633 cf = (struct ieee_ie_cf_param_set *) pos;
634 memcpy(&bss->ss.cf, cf, sizeof(*cf));
635 lbs_deb_scan("got CF IE\n");
636 break;
637
638 case WLAN_EID_IBSS_PARAMS:
639 ibss = (struct ieee_ie_ibss_param_set *) pos;
640 bss->atimwindow = ibss->atimwindow;
641 memcpy(&bss->ss.ibss, ibss, sizeof(*ibss));
642 lbs_deb_scan("got IBSS IE\n");
643 break;
644
645 case WLAN_EID_COUNTRY:
646 pcountryinfo = (struct ieee_ie_country_info_set *) pos;
647 lbs_deb_scan("got COUNTRY IE\n");
648 if (pcountryinfo->header.len < sizeof(pcountryinfo->countrycode)
649 || pcountryinfo->header.len > 254) {
650 lbs_deb_scan("%s: 11D- Err CountryInfo len %d, min %zd, max 254\n",
651 __func__,
652 pcountryinfo->header.len,
653 sizeof(pcountryinfo->countrycode));
654 ret = -1;
655 goto done;
656 }
657
658 memcpy(&bss->countryinfo, pcountryinfo,
659 pcountryinfo->header.len + 2);
660 lbs_deb_hex(LBS_DEB_SCAN, "process_bss: 11d countryinfo",
661 (uint8_t *) pcountryinfo,
662 (int) (pcountryinfo->header.len + 2));
663 break;
664
665 case WLAN_EID_EXT_SUPP_RATES:
666 /* only process extended supported rate if data rate is
667 * already found. Data rate IE should come before
668 * extended supported rate IE
669 */
670 lbs_deb_scan("got RATESEX IE\n");
671 if (!got_basic_rates) {
672 lbs_deb_scan("... but ignoring it\n");
673 break;
674 }
675
676 n_ex_rates = pos[1];
677 if (n_basic_rates + n_ex_rates > MAX_RATES)
678 n_ex_rates = MAX_RATES - n_basic_rates;
679
680 p = bss->rates + n_basic_rates;
681 memcpy(p, pos + 2, n_ex_rates);
682 break;
683
684 case WLAN_EID_GENERIC:
685 if (pos[1] >= 4 &&
686 pos[2] == 0x00 && pos[3] == 0x50 &&
687 pos[4] == 0xf2 && pos[5] == 0x01) {
688 bss->wpa_ie_len = min(pos[1] + 2, MAX_WPA_IE_LEN);
689 memcpy(bss->wpa_ie, pos, bss->wpa_ie_len);
690 lbs_deb_scan("got WPA IE\n");
691 lbs_deb_hex(LBS_DEB_SCAN, "WPA IE", bss->wpa_ie,
692 bss->wpa_ie_len);
693 } else if (pos[1] >= MARVELL_MESH_IE_LENGTH &&
694 pos[2] == 0x00 && pos[3] == 0x50 &&
695 pos[4] == 0x43 && pos[5] == 0x04) {
696 lbs_deb_scan("got mesh IE\n");
697 bss->mesh = 1;
698 } else {
699 lbs_deb_scan("got generic IE: %02x:%02x:%02x:%02x, len %d\n",
700 pos[2], pos[3],
701 pos[4], pos[5],
702 pos[1]);
703 }
704 break;
705
706 case WLAN_EID_RSN:
707 lbs_deb_scan("got RSN IE\n");
708 bss->rsn_ie_len = min(pos[1] + 2, MAX_WPA_IE_LEN);
709 memcpy(bss->rsn_ie, pos, bss->rsn_ie_len);
710 lbs_deb_hex(LBS_DEB_SCAN, "process_bss: RSN_IE",
711 bss->rsn_ie, bss->rsn_ie_len);
712 break;
713
714 default:
715 lbs_deb_scan("got IE 0x%04x, len %d\n",
716 pos[0], pos[1]);
717 break;
718 }
719
720 pos += pos[1] + 2;
721 }
722
723 /* Timestamp */
724 bss->last_scanned = jiffies;
725 lbs_unset_basic_rate_flags(bss->rates, sizeof(bss->rates));
726
727 ret = 0;
728
729 done:
730 lbs_deb_leave_args(LBS_DEB_SCAN, "ret %d", ret);
731 return ret;
732 }
733
734 /**
735 * @brief Send a scan command for all available channels filtered on a spec
736 *
737 * Used in association code and from debugfs
738 *
739 * @param priv A pointer to struct lbs_private structure
740 * @param ssid A pointer to the SSID to scan for
741 * @param ssid_len Length of the SSID
742 *
743 * @return 0-success, otherwise fail
744 */
745 int lbs_send_specific_ssid_scan(struct lbs_private *priv, uint8_t *ssid,
746 uint8_t ssid_len)
747 {
748 DECLARE_SSID_BUF(ssid_buf);
749 int ret = 0;
750
751 lbs_deb_enter_args(LBS_DEB_SCAN, "SSID '%s'\n",
752 print_ssid(ssid_buf, ssid, ssid_len));
753
754 if (!ssid_len)
755 goto out;
756
757 memcpy(priv->scan_ssid, ssid, ssid_len);
758 priv->scan_ssid_len = ssid_len;
759
760 lbs_scan_networks(priv, 1);
761 if (priv->surpriseremoved) {
762 ret = -1;
763 goto out;
764 }
765
766 out:
767 lbs_deb_leave_args(LBS_DEB_SCAN, "ret %d", ret);
768 return ret;
769 }
770
771
772
773
774 /*********************************************************************/
775 /* */
776 /* Support for Wireless Extensions */
777 /* */
778 /*********************************************************************/
779
780
781 #define MAX_CUSTOM_LEN 64
782
783 static inline char *lbs_translate_scan(struct lbs_private *priv,
784 struct iw_request_info *info,
785 char *start, char *stop,
786 struct bss_descriptor *bss)
787 {
788 struct chan_freq_power *cfp;
789 char *current_val; /* For rates */
790 struct iw_event iwe; /* Temporary buffer */
791 int j;
792 #define PERFECT_RSSI ((uint8_t)50)
793 #define WORST_RSSI ((uint8_t)0)
794 #define RSSI_DIFF ((uint8_t)(PERFECT_RSSI - WORST_RSSI))
795 uint8_t rssi;
796
797 lbs_deb_enter(LBS_DEB_SCAN);
798
799 cfp = lbs_find_cfp_by_band_and_channel(priv, 0, bss->channel);
800 if (!cfp) {
801 lbs_deb_scan("Invalid channel number %d\n", bss->channel);
802 start = NULL;
803 goto out;
804 }
805
806 /* First entry *MUST* be the BSSID */
807 iwe.cmd = SIOCGIWAP;
808 iwe.u.ap_addr.sa_family = ARPHRD_ETHER;
809 memcpy(iwe.u.ap_addr.sa_data, &bss->bssid, ETH_ALEN);
810 start = iwe_stream_add_event(info, start, stop, &iwe, IW_EV_ADDR_LEN);
811
812 /* SSID */
813 iwe.cmd = SIOCGIWESSID;
814 iwe.u.data.flags = 1;
815 iwe.u.data.length = min((uint32_t) bss->ssid_len, (uint32_t) IW_ESSID_MAX_SIZE);
816 start = iwe_stream_add_point(info, start, stop, &iwe, bss->ssid);
817
818 /* Mode */
819 iwe.cmd = SIOCGIWMODE;
820 iwe.u.mode = bss->mode;
821 start = iwe_stream_add_event(info, start, stop, &iwe, IW_EV_UINT_LEN);
822
823 /* Frequency */
824 iwe.cmd = SIOCGIWFREQ;
825 iwe.u.freq.m = (long)cfp->freq * 100000;
826 iwe.u.freq.e = 1;
827 start = iwe_stream_add_event(info, start, stop, &iwe, IW_EV_FREQ_LEN);
828
829 /* Add quality statistics */
830 iwe.cmd = IWEVQUAL;
831 iwe.u.qual.updated = IW_QUAL_ALL_UPDATED;
832 iwe.u.qual.level = SCAN_RSSI(bss->rssi);
833
834 rssi = iwe.u.qual.level - MRVDRV_NF_DEFAULT_SCAN_VALUE;
835 iwe.u.qual.qual =
836 (100 * RSSI_DIFF * RSSI_DIFF - (PERFECT_RSSI - rssi) *
837 (15 * (RSSI_DIFF) + 62 * (PERFECT_RSSI - rssi))) /
838 (RSSI_DIFF * RSSI_DIFF);
839 if (iwe.u.qual.qual > 100)
840 iwe.u.qual.qual = 100;
841
842 if (priv->NF[TYPE_BEACON][TYPE_NOAVG] == 0) {
843 iwe.u.qual.noise = MRVDRV_NF_DEFAULT_SCAN_VALUE;
844 } else {
845 iwe.u.qual.noise = CAL_NF(priv->NF[TYPE_BEACON][TYPE_NOAVG]);
846 }
847
848 /* Locally created ad-hoc BSSs won't have beacons if this is the
849 * only station in the adhoc network; so get signal strength
850 * from receive statistics.
851 */
852 if ((priv->mode == IW_MODE_ADHOC) && priv->adhoccreate
853 && !lbs_ssid_cmp(priv->curbssparams.ssid,
854 priv->curbssparams.ssid_len,
855 bss->ssid, bss->ssid_len)) {
856 int snr, nf;
857 snr = priv->SNR[TYPE_RXPD][TYPE_AVG] / AVG_SCALE;
858 nf = priv->NF[TYPE_RXPD][TYPE_AVG] / AVG_SCALE;
859 iwe.u.qual.level = CAL_RSSI(snr, nf);
860 }
861 start = iwe_stream_add_event(info, start, stop, &iwe, IW_EV_QUAL_LEN);
862
863 /* Add encryption capability */
864 iwe.cmd = SIOCGIWENCODE;
865 if (bss->capability & WLAN_CAPABILITY_PRIVACY) {
866 iwe.u.data.flags = IW_ENCODE_ENABLED | IW_ENCODE_NOKEY;
867 } else {
868 iwe.u.data.flags = IW_ENCODE_DISABLED;
869 }
870 iwe.u.data.length = 0;
871 start = iwe_stream_add_point(info, start, stop, &iwe, bss->ssid);
872
873 current_val = start + iwe_stream_lcp_len(info);
874
875 iwe.cmd = SIOCGIWRATE;
876 iwe.u.bitrate.fixed = 0;
877 iwe.u.bitrate.disabled = 0;
878 iwe.u.bitrate.value = 0;
879
880 for (j = 0; j < ARRAY_SIZE(bss->rates) && bss->rates[j]; j++) {
881 /* Bit rate given in 500 kb/s units */
882 iwe.u.bitrate.value = bss->rates[j] * 500000;
883 current_val = iwe_stream_add_value(info, start, current_val,
884 stop, &iwe, IW_EV_PARAM_LEN);
885 }
886 if ((bss->mode == IW_MODE_ADHOC) && priv->adhoccreate
887 && !lbs_ssid_cmp(priv->curbssparams.ssid,
888 priv->curbssparams.ssid_len,
889 bss->ssid, bss->ssid_len)) {
890 iwe.u.bitrate.value = 22 * 500000;
891 current_val = iwe_stream_add_value(info, start, current_val,
892 stop, &iwe, IW_EV_PARAM_LEN);
893 }
894 /* Check if we added any event */
895 if ((current_val - start) > iwe_stream_lcp_len(info))
896 start = current_val;
897
898 memset(&iwe, 0, sizeof(iwe));
899 if (bss->wpa_ie_len) {
900 char buf[MAX_WPA_IE_LEN];
901 memcpy(buf, bss->wpa_ie, bss->wpa_ie_len);
902 iwe.cmd = IWEVGENIE;
903 iwe.u.data.length = bss->wpa_ie_len;
904 start = iwe_stream_add_point(info, start, stop, &iwe, buf);
905 }
906
907 memset(&iwe, 0, sizeof(iwe));
908 if (bss->rsn_ie_len) {
909 char buf[MAX_WPA_IE_LEN];
910 memcpy(buf, bss->rsn_ie, bss->rsn_ie_len);
911 iwe.cmd = IWEVGENIE;
912 iwe.u.data.length = bss->rsn_ie_len;
913 start = iwe_stream_add_point(info, start, stop, &iwe, buf);
914 }
915
916 if (bss->mesh) {
917 char custom[MAX_CUSTOM_LEN];
918 char *p = custom;
919
920 iwe.cmd = IWEVCUSTOM;
921 p += snprintf(p, MAX_CUSTOM_LEN, "mesh-type: olpc");
922 iwe.u.data.length = p - custom;
923 if (iwe.u.data.length)
924 start = iwe_stream_add_point(info, start, stop,
925 &iwe, custom);
926 }
927
928 out:
929 lbs_deb_leave_args(LBS_DEB_SCAN, "start %p", start);
930 return start;
931 }
932
933
934 /**
935 * @brief Handle Scan Network ioctl
936 *
937 * @param dev A pointer to net_device structure
938 * @param info A pointer to iw_request_info structure
939 * @param vwrq A pointer to iw_param structure
940 * @param extra A pointer to extra data buf
941 *
942 * @return 0 --success, otherwise fail
943 */
944 int lbs_set_scan(struct net_device *dev, struct iw_request_info *info,
945 union iwreq_data *wrqu, char *extra)
946 {
947 DECLARE_SSID_BUF(ssid);
948 struct lbs_private *priv = dev->ml_priv;
949 int ret = 0;
950
951 lbs_deb_enter(LBS_DEB_WEXT);
952
953 if (!priv->radio_on) {
954 ret = -EINVAL;
955 goto out;
956 }
957
958 if (!netif_running(dev)) {
959 ret = -ENETDOWN;
960 goto out;
961 }
962
963 /* mac80211 does this:
964 struct ieee80211_sub_if_data *sdata = IEEE80211_DEV_TO_SUB_IF(dev);
965 if (sdata->type != IEEE80211_IF_TYPE_xxx) {
966 ret = -EOPNOTSUPP;
967 goto out;
968 }
969 */
970
971 if (wrqu->data.length == sizeof(struct iw_scan_req) &&
972 wrqu->data.flags & IW_SCAN_THIS_ESSID) {
973 struct iw_scan_req *req = (struct iw_scan_req *)extra;
974 priv->scan_ssid_len = req->essid_len;
975 memcpy(priv->scan_ssid, req->essid, priv->scan_ssid_len);
976 lbs_deb_wext("set_scan, essid '%s'\n",
977 print_ssid(ssid, priv->scan_ssid, priv->scan_ssid_len));
978 } else {
979 priv->scan_ssid_len = 0;
980 }
981
982 if (!delayed_work_pending(&priv->scan_work))
983 queue_delayed_work(priv->work_thread, &priv->scan_work,
984 msecs_to_jiffies(50));
985 /* set marker that currently a scan is taking place */
986 priv->scan_channel = -1;
987
988 if (priv->surpriseremoved)
989 ret = -EIO;
990
991 out:
992 lbs_deb_leave_args(LBS_DEB_WEXT, "ret %d", ret);
993 return ret;
994 }
995
996
997 /**
998 * @brief Handle Retrieve scan table ioctl
999 *
1000 * @param dev A pointer to net_device structure
1001 * @param info A pointer to iw_request_info structure
1002 * @param dwrq A pointer to iw_point structure
1003 * @param extra A pointer to extra data buf
1004 *
1005 * @return 0 --success, otherwise fail
1006 */
1007 int lbs_get_scan(struct net_device *dev, struct iw_request_info *info,
1008 struct iw_point *dwrq, char *extra)
1009 {
1010 #define SCAN_ITEM_SIZE 128
1011 struct lbs_private *priv = dev->ml_priv;
1012 int err = 0;
1013 char *ev = extra;
1014 char *stop = ev + dwrq->length;
1015 struct bss_descriptor *iter_bss;
1016 struct bss_descriptor *safe;
1017
1018 lbs_deb_enter(LBS_DEB_WEXT);
1019
1020 /* iwlist should wait until the current scan is finished */
1021 if (priv->scan_channel)
1022 return -EAGAIN;
1023
1024 /* Update RSSI if current BSS is a locally created ad-hoc BSS */
1025 if ((priv->mode == IW_MODE_ADHOC) && priv->adhoccreate)
1026 lbs_prepare_and_send_command(priv, CMD_802_11_RSSI, 0,
1027 CMD_OPTION_WAITFORRSP, 0, NULL);
1028
1029 mutex_lock(&priv->lock);
1030 list_for_each_entry_safe (iter_bss, safe, &priv->network_list, list) {
1031 char *next_ev;
1032 unsigned long stale_time;
1033
1034 if (stop - ev < SCAN_ITEM_SIZE) {
1035 err = -E2BIG;
1036 break;
1037 }
1038
1039 /* For mesh device, list only mesh networks */
1040 if (dev == priv->mesh_dev && !iter_bss->mesh)
1041 continue;
1042
1043 /* Prune old an old scan result */
1044 stale_time = iter_bss->last_scanned + DEFAULT_MAX_SCAN_AGE;
1045 if (time_after(jiffies, stale_time)) {
1046 list_move_tail(&iter_bss->list, &priv->network_free_list);
1047 clear_bss_descriptor(iter_bss);
1048 continue;
1049 }
1050
1051 /* Translate to WE format this entry */
1052 next_ev = lbs_translate_scan(priv, info, ev, stop, iter_bss);
1053 if (next_ev == NULL)
1054 continue;
1055 ev = next_ev;
1056 }
1057 mutex_unlock(&priv->lock);
1058
1059 dwrq->length = (ev - extra);
1060 dwrq->flags = 0;
1061
1062 lbs_deb_leave_args(LBS_DEB_WEXT, "ret %d", err);
1063 return err;
1064 }
1065
1066
1067
1068
1069 /*********************************************************************/
1070 /* */
1071 /* Command execution */
1072 /* */
1073 /*********************************************************************/
1074
1075
1076 /**
1077 * @brief This function handles the command response of scan
1078 *
1079 * Called from handle_cmd_response() in cmdrespc.
1080 *
1081 * The response buffer for the scan command has the following
1082 * memory layout:
1083 *
1084 * .-----------------------------------------------------------.
1085 * | header (4 * sizeof(u16)): Standard command response hdr |
1086 * .-----------------------------------------------------------.
1087 * | bufsize (u16) : sizeof the BSS Description data |
1088 * .-----------------------------------------------------------.
1089 * | NumOfSet (u8) : Number of BSS Descs returned |
1090 * .-----------------------------------------------------------.
1091 * | BSSDescription data (variable, size given in bufsize) |
1092 * .-----------------------------------------------------------.
1093 * | TLV data (variable, size calculated using header->size, |
1094 * | bufsize and sizeof the fixed fields above) |
1095 * .-----------------------------------------------------------.
1096 *
1097 * @param priv A pointer to struct lbs_private structure
1098 * @param resp A pointer to cmd_ds_command
1099 *
1100 * @return 0 or -1
1101 */
1102 static int lbs_ret_80211_scan(struct lbs_private *priv, unsigned long dummy,
1103 struct cmd_header *resp)
1104 {
1105 struct cmd_ds_802_11_scan_rsp *scanresp = (void *)resp;
1106 struct bss_descriptor *iter_bss;
1107 struct bss_descriptor *safe;
1108 uint8_t *bssinfo;
1109 uint16_t scanrespsize;
1110 int bytesleft;
1111 int idx;
1112 int tlvbufsize;
1113 int ret;
1114
1115 lbs_deb_enter(LBS_DEB_SCAN);
1116
1117 /* Prune old entries from scan table */
1118 list_for_each_entry_safe (iter_bss, safe, &priv->network_list, list) {
1119 unsigned long stale_time = iter_bss->last_scanned + DEFAULT_MAX_SCAN_AGE;
1120 if (time_before(jiffies, stale_time))
1121 continue;
1122 list_move_tail (&iter_bss->list, &priv->network_free_list);
1123 clear_bss_descriptor(iter_bss);
1124 }
1125
1126 if (scanresp->nr_sets > MAX_NETWORK_COUNT) {
1127 lbs_deb_scan("SCAN_RESP: too many scan results (%d, max %d)\n",
1128 scanresp->nr_sets, MAX_NETWORK_COUNT);
1129 ret = -1;
1130 goto done;
1131 }
1132
1133 bytesleft = get_unaligned_le16(&scanresp->bssdescriptsize);
1134 lbs_deb_scan("SCAN_RESP: bssdescriptsize %d\n", bytesleft);
1135
1136 scanrespsize = le16_to_cpu(resp->size);
1137 lbs_deb_scan("SCAN_RESP: scan results %d\n", scanresp->nr_sets);
1138
1139 bssinfo = scanresp->bssdesc_and_tlvbuffer;
1140
1141 /* The size of the TLV buffer is equal to the entire command response
1142 * size (scanrespsize) minus the fixed fields (sizeof()'s), the
1143 * BSS Descriptions (bssdescriptsize as bytesLef) and the command
1144 * response header (S_DS_GEN)
1145 */
1146 tlvbufsize = scanrespsize - (bytesleft + sizeof(scanresp->bssdescriptsize)
1147 + sizeof(scanresp->nr_sets)
1148 + S_DS_GEN);
1149
1150 /*
1151 * Process each scan response returned (scanresp->nr_sets). Save
1152 * the information in the newbssentry and then insert into the
1153 * driver scan table either as an update to an existing entry
1154 * or as an addition at the end of the table
1155 */
1156 for (idx = 0; idx < scanresp->nr_sets && bytesleft; idx++) {
1157 struct bss_descriptor new;
1158 struct bss_descriptor *found = NULL;
1159 struct bss_descriptor *oldest = NULL;
1160
1161 /* Process the data fields and IEs returned for this BSS */
1162 memset(&new, 0, sizeof (struct bss_descriptor));
1163 if (lbs_process_bss(&new, &bssinfo, &bytesleft) != 0) {
1164 /* error parsing the scan response, skipped */
1165 lbs_deb_scan("SCAN_RESP: process_bss returned ERROR\n");
1166 continue;
1167 }
1168
1169 /* Try to find this bss in the scan table */
1170 list_for_each_entry (iter_bss, &priv->network_list, list) {
1171 if (is_same_network(iter_bss, &new)) {
1172 found = iter_bss;
1173 break;
1174 }
1175
1176 if ((oldest == NULL) ||
1177 (iter_bss->last_scanned < oldest->last_scanned))
1178 oldest = iter_bss;
1179 }
1180
1181 if (found) {
1182 /* found, clear it */
1183 clear_bss_descriptor(found);
1184 } else if (!list_empty(&priv->network_free_list)) {
1185 /* Pull one from the free list */
1186 found = list_entry(priv->network_free_list.next,
1187 struct bss_descriptor, list);
1188 list_move_tail(&found->list, &priv->network_list);
1189 } else if (oldest) {
1190 /* If there are no more slots, expire the oldest */
1191 found = oldest;
1192 clear_bss_descriptor(found);
1193 list_move_tail(&found->list, &priv->network_list);
1194 } else {
1195 continue;
1196 }
1197
1198 lbs_deb_scan("SCAN_RESP: BSSID %pM\n", new.bssid);
1199
1200 /* Copy the locally created newbssentry to the scan table */
1201 memcpy(found, &new, offsetof(struct bss_descriptor, list));
1202 }
1203
1204 ret = 0;
1205
1206 done:
1207 lbs_deb_leave_args(LBS_DEB_SCAN, "ret %d", ret);
1208 return ret;
1209 }
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