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Linux/net/wireless/wext-core.c

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  1 /*
  2  * This file implement the Wireless Extensions core API.
  3  *
  4  * Authors :    Jean Tourrilhes - HPL - <jt@hpl.hp.com>
  5  * Copyright (c) 1997-2007 Jean Tourrilhes, All Rights Reserved.
  6  * Copyright    2009 Johannes Berg <johannes@sipsolutions.net>
  7  *
  8  * (As all part of the Linux kernel, this file is GPL)
  9  */
 10 #include <linux/kernel.h>
 11 #include <linux/netdevice.h>
 12 #include <linux/rtnetlink.h>
 13 #include <linux/slab.h>
 14 #include <linux/wireless.h>
 15 #include <linux/uaccess.h>
 16 #include <linux/export.h>
 17 #include <net/cfg80211.h>
 18 #include <net/iw_handler.h>
 19 #include <net/netlink.h>
 20 #include <net/wext.h>
 21 #include <net/net_namespace.h>
 22 
 23 typedef int (*wext_ioctl_func)(struct net_device *, struct iwreq *,
 24                                unsigned int, struct iw_request_info *,
 25                                iw_handler);
 26 
 27 
 28 /*
 29  * Meta-data about all the standard Wireless Extension request we
 30  * know about.
 31  */
 32 static const struct iw_ioctl_description standard_ioctl[] = {
 33         [IW_IOCTL_IDX(SIOCSIWCOMMIT)] = {
 34                 .header_type    = IW_HEADER_TYPE_NULL,
 35         },
 36         [IW_IOCTL_IDX(SIOCGIWNAME)] = {
 37                 .header_type    = IW_HEADER_TYPE_CHAR,
 38                 .flags          = IW_DESCR_FLAG_DUMP,
 39         },
 40         [IW_IOCTL_IDX(SIOCSIWNWID)] = {
 41                 .header_type    = IW_HEADER_TYPE_PARAM,
 42                 .flags          = IW_DESCR_FLAG_EVENT,
 43         },
 44         [IW_IOCTL_IDX(SIOCGIWNWID)] = {
 45                 .header_type    = IW_HEADER_TYPE_PARAM,
 46                 .flags          = IW_DESCR_FLAG_DUMP,
 47         },
 48         [IW_IOCTL_IDX(SIOCSIWFREQ)] = {
 49                 .header_type    = IW_HEADER_TYPE_FREQ,
 50                 .flags          = IW_DESCR_FLAG_EVENT,
 51         },
 52         [IW_IOCTL_IDX(SIOCGIWFREQ)] = {
 53                 .header_type    = IW_HEADER_TYPE_FREQ,
 54                 .flags          = IW_DESCR_FLAG_DUMP,
 55         },
 56         [IW_IOCTL_IDX(SIOCSIWMODE)] = {
 57                 .header_type    = IW_HEADER_TYPE_UINT,
 58                 .flags          = IW_DESCR_FLAG_EVENT,
 59         },
 60         [IW_IOCTL_IDX(SIOCGIWMODE)] = {
 61                 .header_type    = IW_HEADER_TYPE_UINT,
 62                 .flags          = IW_DESCR_FLAG_DUMP,
 63         },
 64         [IW_IOCTL_IDX(SIOCSIWSENS)] = {
 65                 .header_type    = IW_HEADER_TYPE_PARAM,
 66         },
 67         [IW_IOCTL_IDX(SIOCGIWSENS)] = {
 68                 .header_type    = IW_HEADER_TYPE_PARAM,
 69         },
 70         [IW_IOCTL_IDX(SIOCSIWRANGE)] = {
 71                 .header_type    = IW_HEADER_TYPE_NULL,
 72         },
 73         [IW_IOCTL_IDX(SIOCGIWRANGE)] = {
 74                 .header_type    = IW_HEADER_TYPE_POINT,
 75                 .token_size     = 1,
 76                 .max_tokens     = sizeof(struct iw_range),
 77                 .flags          = IW_DESCR_FLAG_DUMP,
 78         },
 79         [IW_IOCTL_IDX(SIOCSIWPRIV)] = {
 80                 .header_type    = IW_HEADER_TYPE_NULL,
 81         },
 82         [IW_IOCTL_IDX(SIOCGIWPRIV)] = { /* (handled directly by us) */
 83                 .header_type    = IW_HEADER_TYPE_POINT,
 84                 .token_size     = sizeof(struct iw_priv_args),
 85                 .max_tokens     = 16,
 86                 .flags          = IW_DESCR_FLAG_NOMAX,
 87         },
 88         [IW_IOCTL_IDX(SIOCSIWSTATS)] = {
 89                 .header_type    = IW_HEADER_TYPE_NULL,
 90         },
 91         [IW_IOCTL_IDX(SIOCGIWSTATS)] = { /* (handled directly by us) */
 92                 .header_type    = IW_HEADER_TYPE_POINT,
 93                 .token_size     = 1,
 94                 .max_tokens     = sizeof(struct iw_statistics),
 95                 .flags          = IW_DESCR_FLAG_DUMP,
 96         },
 97         [IW_IOCTL_IDX(SIOCSIWSPY)] = {
 98                 .header_type    = IW_HEADER_TYPE_POINT,
 99                 .token_size     = sizeof(struct sockaddr),
100                 .max_tokens     = IW_MAX_SPY,
101         },
102         [IW_IOCTL_IDX(SIOCGIWSPY)] = {
103                 .header_type    = IW_HEADER_TYPE_POINT,
104                 .token_size     = sizeof(struct sockaddr) +
105                                   sizeof(struct iw_quality),
106                 .max_tokens     = IW_MAX_SPY,
107         },
108         [IW_IOCTL_IDX(SIOCSIWTHRSPY)] = {
109                 .header_type    = IW_HEADER_TYPE_POINT,
110                 .token_size     = sizeof(struct iw_thrspy),
111                 .min_tokens     = 1,
112                 .max_tokens     = 1,
113         },
114         [IW_IOCTL_IDX(SIOCGIWTHRSPY)] = {
115                 .header_type    = IW_HEADER_TYPE_POINT,
116                 .token_size     = sizeof(struct iw_thrspy),
117                 .min_tokens     = 1,
118                 .max_tokens     = 1,
119         },
120         [IW_IOCTL_IDX(SIOCSIWAP)] = {
121                 .header_type    = IW_HEADER_TYPE_ADDR,
122         },
123         [IW_IOCTL_IDX(SIOCGIWAP)] = {
124                 .header_type    = IW_HEADER_TYPE_ADDR,
125                 .flags          = IW_DESCR_FLAG_DUMP,
126         },
127         [IW_IOCTL_IDX(SIOCSIWMLME)] = {
128                 .header_type    = IW_HEADER_TYPE_POINT,
129                 .token_size     = 1,
130                 .min_tokens     = sizeof(struct iw_mlme),
131                 .max_tokens     = sizeof(struct iw_mlme),
132         },
133         [IW_IOCTL_IDX(SIOCGIWAPLIST)] = {
134                 .header_type    = IW_HEADER_TYPE_POINT,
135                 .token_size     = sizeof(struct sockaddr) +
136                                   sizeof(struct iw_quality),
137                 .max_tokens     = IW_MAX_AP,
138                 .flags          = IW_DESCR_FLAG_NOMAX,
139         },
140         [IW_IOCTL_IDX(SIOCSIWSCAN)] = {
141                 .header_type    = IW_HEADER_TYPE_POINT,
142                 .token_size     = 1,
143                 .min_tokens     = 0,
144                 .max_tokens     = sizeof(struct iw_scan_req),
145         },
146         [IW_IOCTL_IDX(SIOCGIWSCAN)] = {
147                 .header_type    = IW_HEADER_TYPE_POINT,
148                 .token_size     = 1,
149                 .max_tokens     = IW_SCAN_MAX_DATA,
150                 .flags          = IW_DESCR_FLAG_NOMAX,
151         },
152         [IW_IOCTL_IDX(SIOCSIWESSID)] = {
153                 .header_type    = IW_HEADER_TYPE_POINT,
154                 .token_size     = 1,
155                 .max_tokens     = IW_ESSID_MAX_SIZE,
156                 .flags          = IW_DESCR_FLAG_EVENT,
157         },
158         [IW_IOCTL_IDX(SIOCGIWESSID)] = {
159                 .header_type    = IW_HEADER_TYPE_POINT,
160                 .token_size     = 1,
161                 .max_tokens     = IW_ESSID_MAX_SIZE,
162                 .flags          = IW_DESCR_FLAG_DUMP,
163         },
164         [IW_IOCTL_IDX(SIOCSIWNICKN)] = {
165                 .header_type    = IW_HEADER_TYPE_POINT,
166                 .token_size     = 1,
167                 .max_tokens     = IW_ESSID_MAX_SIZE,
168         },
169         [IW_IOCTL_IDX(SIOCGIWNICKN)] = {
170                 .header_type    = IW_HEADER_TYPE_POINT,
171                 .token_size     = 1,
172                 .max_tokens     = IW_ESSID_MAX_SIZE,
173         },
174         [IW_IOCTL_IDX(SIOCSIWRATE)] = {
175                 .header_type    = IW_HEADER_TYPE_PARAM,
176         },
177         [IW_IOCTL_IDX(SIOCGIWRATE)] = {
178                 .header_type    = IW_HEADER_TYPE_PARAM,
179         },
180         [IW_IOCTL_IDX(SIOCSIWRTS)] = {
181                 .header_type    = IW_HEADER_TYPE_PARAM,
182         },
183         [IW_IOCTL_IDX(SIOCGIWRTS)] = {
184                 .header_type    = IW_HEADER_TYPE_PARAM,
185         },
186         [IW_IOCTL_IDX(SIOCSIWFRAG)] = {
187                 .header_type    = IW_HEADER_TYPE_PARAM,
188         },
189         [IW_IOCTL_IDX(SIOCGIWFRAG)] = {
190                 .header_type    = IW_HEADER_TYPE_PARAM,
191         },
192         [IW_IOCTL_IDX(SIOCSIWTXPOW)] = {
193                 .header_type    = IW_HEADER_TYPE_PARAM,
194         },
195         [IW_IOCTL_IDX(SIOCGIWTXPOW)] = {
196                 .header_type    = IW_HEADER_TYPE_PARAM,
197         },
198         [IW_IOCTL_IDX(SIOCSIWRETRY)] = {
199                 .header_type    = IW_HEADER_TYPE_PARAM,
200         },
201         [IW_IOCTL_IDX(SIOCGIWRETRY)] = {
202                 .header_type    = IW_HEADER_TYPE_PARAM,
203         },
204         [IW_IOCTL_IDX(SIOCSIWENCODE)] = {
205                 .header_type    = IW_HEADER_TYPE_POINT,
206                 .token_size     = 1,
207                 .max_tokens     = IW_ENCODING_TOKEN_MAX,
208                 .flags          = IW_DESCR_FLAG_EVENT | IW_DESCR_FLAG_RESTRICT,
209         },
210         [IW_IOCTL_IDX(SIOCGIWENCODE)] = {
211                 .header_type    = IW_HEADER_TYPE_POINT,
212                 .token_size     = 1,
213                 .max_tokens     = IW_ENCODING_TOKEN_MAX,
214                 .flags          = IW_DESCR_FLAG_DUMP | IW_DESCR_FLAG_RESTRICT,
215         },
216         [IW_IOCTL_IDX(SIOCSIWPOWER)] = {
217                 .header_type    = IW_HEADER_TYPE_PARAM,
218         },
219         [IW_IOCTL_IDX(SIOCGIWPOWER)] = {
220                 .header_type    = IW_HEADER_TYPE_PARAM,
221         },
222         [IW_IOCTL_IDX(SIOCSIWGENIE)] = {
223                 .header_type    = IW_HEADER_TYPE_POINT,
224                 .token_size     = 1,
225                 .max_tokens     = IW_GENERIC_IE_MAX,
226         },
227         [IW_IOCTL_IDX(SIOCGIWGENIE)] = {
228                 .header_type    = IW_HEADER_TYPE_POINT,
229                 .token_size     = 1,
230                 .max_tokens     = IW_GENERIC_IE_MAX,
231         },
232         [IW_IOCTL_IDX(SIOCSIWAUTH)] = {
233                 .header_type    = IW_HEADER_TYPE_PARAM,
234         },
235         [IW_IOCTL_IDX(SIOCGIWAUTH)] = {
236                 .header_type    = IW_HEADER_TYPE_PARAM,
237         },
238         [IW_IOCTL_IDX(SIOCSIWENCODEEXT)] = {
239                 .header_type    = IW_HEADER_TYPE_POINT,
240                 .token_size     = 1,
241                 .min_tokens     = sizeof(struct iw_encode_ext),
242                 .max_tokens     = sizeof(struct iw_encode_ext) +
243                                   IW_ENCODING_TOKEN_MAX,
244         },
245         [IW_IOCTL_IDX(SIOCGIWENCODEEXT)] = {
246                 .header_type    = IW_HEADER_TYPE_POINT,
247                 .token_size     = 1,
248                 .min_tokens     = sizeof(struct iw_encode_ext),
249                 .max_tokens     = sizeof(struct iw_encode_ext) +
250                                   IW_ENCODING_TOKEN_MAX,
251         },
252         [IW_IOCTL_IDX(SIOCSIWPMKSA)] = {
253                 .header_type    = IW_HEADER_TYPE_POINT,
254                 .token_size     = 1,
255                 .min_tokens     = sizeof(struct iw_pmksa),
256                 .max_tokens     = sizeof(struct iw_pmksa),
257         },
258 };
259 static const unsigned int standard_ioctl_num = ARRAY_SIZE(standard_ioctl);
260 
261 /*
262  * Meta-data about all the additional standard Wireless Extension events
263  * we know about.
264  */
265 static const struct iw_ioctl_description standard_event[] = {
266         [IW_EVENT_IDX(IWEVTXDROP)] = {
267                 .header_type    = IW_HEADER_TYPE_ADDR,
268         },
269         [IW_EVENT_IDX(IWEVQUAL)] = {
270                 .header_type    = IW_HEADER_TYPE_QUAL,
271         },
272         [IW_EVENT_IDX(IWEVCUSTOM)] = {
273                 .header_type    = IW_HEADER_TYPE_POINT,
274                 .token_size     = 1,
275                 .max_tokens     = IW_CUSTOM_MAX,
276         },
277         [IW_EVENT_IDX(IWEVREGISTERED)] = {
278                 .header_type    = IW_HEADER_TYPE_ADDR,
279         },
280         [IW_EVENT_IDX(IWEVEXPIRED)] = {
281                 .header_type    = IW_HEADER_TYPE_ADDR,
282         },
283         [IW_EVENT_IDX(IWEVGENIE)] = {
284                 .header_type    = IW_HEADER_TYPE_POINT,
285                 .token_size     = 1,
286                 .max_tokens     = IW_GENERIC_IE_MAX,
287         },
288         [IW_EVENT_IDX(IWEVMICHAELMICFAILURE)] = {
289                 .header_type    = IW_HEADER_TYPE_POINT,
290                 .token_size     = 1,
291                 .max_tokens     = sizeof(struct iw_michaelmicfailure),
292         },
293         [IW_EVENT_IDX(IWEVASSOCREQIE)] = {
294                 .header_type    = IW_HEADER_TYPE_POINT,
295                 .token_size     = 1,
296                 .max_tokens     = IW_GENERIC_IE_MAX,
297         },
298         [IW_EVENT_IDX(IWEVASSOCRESPIE)] = {
299                 .header_type    = IW_HEADER_TYPE_POINT,
300                 .token_size     = 1,
301                 .max_tokens     = IW_GENERIC_IE_MAX,
302         },
303         [IW_EVENT_IDX(IWEVPMKIDCAND)] = {
304                 .header_type    = IW_HEADER_TYPE_POINT,
305                 .token_size     = 1,
306                 .max_tokens     = sizeof(struct iw_pmkid_cand),
307         },
308 };
309 static const unsigned int standard_event_num = ARRAY_SIZE(standard_event);
310 
311 /* Size (in bytes) of various events */
312 static const int event_type_size[] = {
313         IW_EV_LCP_LEN,                  /* IW_HEADER_TYPE_NULL */
314         0,
315         IW_EV_CHAR_LEN,                 /* IW_HEADER_TYPE_CHAR */
316         0,
317         IW_EV_UINT_LEN,                 /* IW_HEADER_TYPE_UINT */
318         IW_EV_FREQ_LEN,                 /* IW_HEADER_TYPE_FREQ */
319         IW_EV_ADDR_LEN,                 /* IW_HEADER_TYPE_ADDR */
320         0,
321         IW_EV_POINT_LEN,                /* Without variable payload */
322         IW_EV_PARAM_LEN,                /* IW_HEADER_TYPE_PARAM */
323         IW_EV_QUAL_LEN,                 /* IW_HEADER_TYPE_QUAL */
324 };
325 
326 #ifdef CONFIG_COMPAT
327 static const int compat_event_type_size[] = {
328         IW_EV_COMPAT_LCP_LEN,           /* IW_HEADER_TYPE_NULL */
329         0,
330         IW_EV_COMPAT_CHAR_LEN,          /* IW_HEADER_TYPE_CHAR */
331         0,
332         IW_EV_COMPAT_UINT_LEN,          /* IW_HEADER_TYPE_UINT */
333         IW_EV_COMPAT_FREQ_LEN,          /* IW_HEADER_TYPE_FREQ */
334         IW_EV_COMPAT_ADDR_LEN,          /* IW_HEADER_TYPE_ADDR */
335         0,
336         IW_EV_COMPAT_POINT_LEN,         /* Without variable payload */
337         IW_EV_COMPAT_PARAM_LEN,         /* IW_HEADER_TYPE_PARAM */
338         IW_EV_COMPAT_QUAL_LEN,          /* IW_HEADER_TYPE_QUAL */
339 };
340 #endif
341 
342 
343 /* IW event code */
344 
345 void wireless_nlevent_flush(void)
346 {
347         struct sk_buff *skb;
348         struct net *net;
349 
350         down_read(&net_rwsem);
351         for_each_net(net) {
352                 while ((skb = skb_dequeue(&net->wext_nlevents)))
353                         rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL,
354                                     GFP_KERNEL);
355         }
356         up_read(&net_rwsem);
357 }
358 EXPORT_SYMBOL_GPL(wireless_nlevent_flush);
359 
360 static int wext_netdev_notifier_call(struct notifier_block *nb,
361                                      unsigned long state, void *ptr)
362 {
363         /*
364          * When a netdev changes state in any way, flush all pending messages
365          * to avoid them going out in a strange order, e.g. RTM_NEWLINK after
366          * RTM_DELLINK, or with IFF_UP after without IFF_UP during dev_close()
367          * or similar - all of which could otherwise happen due to delays from
368          * schedule_work().
369          */
370         wireless_nlevent_flush();
371 
372         return NOTIFY_OK;
373 }
374 
375 static struct notifier_block wext_netdev_notifier = {
376         .notifier_call = wext_netdev_notifier_call,
377 };
378 
379 static int __net_init wext_pernet_init(struct net *net)
380 {
381         skb_queue_head_init(&net->wext_nlevents);
382         return 0;
383 }
384 
385 static void __net_exit wext_pernet_exit(struct net *net)
386 {
387         skb_queue_purge(&net->wext_nlevents);
388 }
389 
390 static struct pernet_operations wext_pernet_ops = {
391         .init = wext_pernet_init,
392         .exit = wext_pernet_exit,
393 };
394 
395 static int __init wireless_nlevent_init(void)
396 {
397         int err = register_pernet_subsys(&wext_pernet_ops);
398 
399         if (err)
400                 return err;
401 
402         err = register_netdevice_notifier(&wext_netdev_notifier);
403         if (err)
404                 unregister_pernet_subsys(&wext_pernet_ops);
405         return err;
406 }
407 
408 subsys_initcall(wireless_nlevent_init);
409 
410 /* Process events generated by the wireless layer or the driver. */
411 static void wireless_nlevent_process(struct work_struct *work)
412 {
413         wireless_nlevent_flush();
414 }
415 
416 static DECLARE_WORK(wireless_nlevent_work, wireless_nlevent_process);
417 
418 static struct nlmsghdr *rtnetlink_ifinfo_prep(struct net_device *dev,
419                                               struct sk_buff *skb)
420 {
421         struct ifinfomsg *r;
422         struct nlmsghdr  *nlh;
423 
424         nlh = nlmsg_put(skb, 0, 0, RTM_NEWLINK, sizeof(*r), 0);
425         if (!nlh)
426                 return NULL;
427 
428         r = nlmsg_data(nlh);
429         r->ifi_family = AF_UNSPEC;
430         r->__ifi_pad = 0;
431         r->ifi_type = dev->type;
432         r->ifi_index = dev->ifindex;
433         r->ifi_flags = dev_get_flags(dev);
434         r->ifi_change = 0;      /* Wireless changes don't affect those flags */
435 
436         if (nla_put_string(skb, IFLA_IFNAME, dev->name))
437                 goto nla_put_failure;
438 
439         return nlh;
440  nla_put_failure:
441         nlmsg_cancel(skb, nlh);
442         return NULL;
443 }
444 
445 
446 /*
447  * Main event dispatcher. Called from other parts and drivers.
448  * Send the event on the appropriate channels.
449  * May be called from interrupt context.
450  */
451 void wireless_send_event(struct net_device *    dev,
452                          unsigned int           cmd,
453                          union iwreq_data *     wrqu,
454                          const char *           extra)
455 {
456         const struct iw_ioctl_description *     descr = NULL;
457         int extra_len = 0;
458         struct iw_event  *event;                /* Mallocated whole event */
459         int event_len;                          /* Its size */
460         int hdr_len;                            /* Size of the event header */
461         int wrqu_off = 0;                       /* Offset in wrqu */
462         /* Don't "optimise" the following variable, it will crash */
463         unsigned int    cmd_index;              /* *MUST* be unsigned */
464         struct sk_buff *skb;
465         struct nlmsghdr *nlh;
466         struct nlattr *nla;
467 #ifdef CONFIG_COMPAT
468         struct __compat_iw_event *compat_event;
469         struct compat_iw_point compat_wrqu;
470         struct sk_buff *compskb;
471 #endif
472 
473         /*
474          * Nothing in the kernel sends scan events with data, be safe.
475          * This is necessary because we cannot fix up scan event data
476          * for compat, due to being contained in 'extra', but normally
477          * applications are required to retrieve the scan data anyway
478          * and no data is included in the event, this codifies that
479          * practice.
480          */
481         if (WARN_ON(cmd == SIOCGIWSCAN && extra))
482                 extra = NULL;
483 
484         /* Get the description of the Event */
485         if (cmd <= SIOCIWLAST) {
486                 cmd_index = IW_IOCTL_IDX(cmd);
487                 if (cmd_index < standard_ioctl_num)
488                         descr = &(standard_ioctl[cmd_index]);
489         } else {
490                 cmd_index = IW_EVENT_IDX(cmd);
491                 if (cmd_index < standard_event_num)
492                         descr = &(standard_event[cmd_index]);
493         }
494         /* Don't accept unknown events */
495         if (descr == NULL) {
496                 /* Note : we don't return an error to the driver, because
497                  * the driver would not know what to do about it. It can't
498                  * return an error to the user, because the event is not
499                  * initiated by a user request.
500                  * The best the driver could do is to log an error message.
501                  * We will do it ourselves instead...
502                  */
503                 netdev_err(dev, "(WE) : Invalid/Unknown Wireless Event (0x%04X)\n",
504                            cmd);
505                 return;
506         }
507 
508         /* Check extra parameters and set extra_len */
509         if (descr->header_type == IW_HEADER_TYPE_POINT) {
510                 /* Check if number of token fits within bounds */
511                 if (wrqu->data.length > descr->max_tokens) {
512                         netdev_err(dev, "(WE) : Wireless Event (cmd=0x%04X) too big (%d)\n",
513                                    cmd, wrqu->data.length);
514                         return;
515                 }
516                 if (wrqu->data.length < descr->min_tokens) {
517                         netdev_err(dev, "(WE) : Wireless Event (cmd=0x%04X) too small (%d)\n",
518                                    cmd, wrqu->data.length);
519                         return;
520                 }
521                 /* Calculate extra_len - extra is NULL for restricted events */
522                 if (extra != NULL)
523                         extra_len = wrqu->data.length * descr->token_size;
524                 /* Always at an offset in wrqu */
525                 wrqu_off = IW_EV_POINT_OFF;
526         }
527 
528         /* Total length of the event */
529         hdr_len = event_type_size[descr->header_type];
530         event_len = hdr_len + extra_len;
531 
532         /*
533          * The problem for 64/32 bit.
534          *
535          * On 64-bit, a regular event is laid out as follows:
536          *      |  0  |  1  |  2  |  3  |  4  |  5  |  6  |  7  |
537          *      | event.len | event.cmd |     p a d d i n g     |
538          *      | wrqu data ... (with the correct size)         |
539          *
540          * This padding exists because we manipulate event->u,
541          * and 'event' is not packed.
542          *
543          * An iw_point event is laid out like this instead:
544          *      |  0  |  1  |  2  |  3  |  4  |  5  |  6  |  7  |
545          *      | event.len | event.cmd |     p a d d i n g     |
546          *      | iwpnt.len | iwpnt.flg |     p a d d i n g     |
547          *      | extra data  ...
548          *
549          * The second padding exists because struct iw_point is extended,
550          * but this depends on the platform...
551          *
552          * On 32-bit, all the padding shouldn't be there.
553          */
554 
555         skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
556         if (!skb)
557                 return;
558 
559         /* Send via the RtNetlink event channel */
560         nlh = rtnetlink_ifinfo_prep(dev, skb);
561         if (WARN_ON(!nlh)) {
562                 kfree_skb(skb);
563                 return;
564         }
565 
566         /* Add the wireless events in the netlink packet */
567         nla = nla_reserve(skb, IFLA_WIRELESS, event_len);
568         if (!nla) {
569                 kfree_skb(skb);
570                 return;
571         }
572         event = nla_data(nla);
573 
574         /* Fill event - first clear to avoid data leaking */
575         memset(event, 0, hdr_len);
576         event->len = event_len;
577         event->cmd = cmd;
578         memcpy(&event->u, ((char *) wrqu) + wrqu_off, hdr_len - IW_EV_LCP_LEN);
579         if (extra_len)
580                 memcpy(((char *) event) + hdr_len, extra, extra_len);
581 
582         nlmsg_end(skb, nlh);
583 #ifdef CONFIG_COMPAT
584         hdr_len = compat_event_type_size[descr->header_type];
585         event_len = hdr_len + extra_len;
586 
587         compskb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
588         if (!compskb) {
589                 kfree_skb(skb);
590                 return;
591         }
592 
593         /* Send via the RtNetlink event channel */
594         nlh = rtnetlink_ifinfo_prep(dev, compskb);
595         if (WARN_ON(!nlh)) {
596                 kfree_skb(skb);
597                 kfree_skb(compskb);
598                 return;
599         }
600 
601         /* Add the wireless events in the netlink packet */
602         nla = nla_reserve(compskb, IFLA_WIRELESS, event_len);
603         if (!nla) {
604                 kfree_skb(skb);
605                 kfree_skb(compskb);
606                 return;
607         }
608         compat_event = nla_data(nla);
609 
610         compat_event->len = event_len;
611         compat_event->cmd = cmd;
612         if (descr->header_type == IW_HEADER_TYPE_POINT) {
613                 compat_wrqu.length = wrqu->data.length;
614                 compat_wrqu.flags = wrqu->data.flags;
615                 memcpy(&compat_event->pointer,
616                         ((char *) &compat_wrqu) + IW_EV_COMPAT_POINT_OFF,
617                         hdr_len - IW_EV_COMPAT_LCP_LEN);
618                 if (extra_len)
619                         memcpy(((char *) compat_event) + hdr_len,
620                                 extra, extra_len);
621         } else {
622                 /* extra_len must be zero, so no if (extra) needed */
623                 memcpy(&compat_event->pointer, wrqu,
624                         hdr_len - IW_EV_COMPAT_LCP_LEN);
625         }
626 
627         nlmsg_end(compskb, nlh);
628 
629         skb_shinfo(skb)->frag_list = compskb;
630 #endif
631         skb_queue_tail(&dev_net(dev)->wext_nlevents, skb);
632         schedule_work(&wireless_nlevent_work);
633 }
634 EXPORT_SYMBOL(wireless_send_event);
635 
636 
637 
638 /* IW handlers */
639 
640 struct iw_statistics *get_wireless_stats(struct net_device *dev)
641 {
642 #ifdef CONFIG_WIRELESS_EXT
643         if ((dev->wireless_handlers != NULL) &&
644            (dev->wireless_handlers->get_wireless_stats != NULL))
645                 return dev->wireless_handlers->get_wireless_stats(dev);
646 #endif
647 
648 #ifdef CONFIG_CFG80211_WEXT
649         if (dev->ieee80211_ptr &&
650             dev->ieee80211_ptr->wiphy &&
651             dev->ieee80211_ptr->wiphy->wext &&
652             dev->ieee80211_ptr->wiphy->wext->get_wireless_stats)
653                 return dev->ieee80211_ptr->wiphy->wext->get_wireless_stats(dev);
654 #endif
655 
656         /* not found */
657         return NULL;
658 }
659 
660 static int iw_handler_get_iwstats(struct net_device *           dev,
661                                   struct iw_request_info *      info,
662                                   union iwreq_data *            wrqu,
663                                   char *                        extra)
664 {
665         /* Get stats from the driver */
666         struct iw_statistics *stats;
667 
668         stats = get_wireless_stats(dev);
669         if (stats) {
670                 /* Copy statistics to extra */
671                 memcpy(extra, stats, sizeof(struct iw_statistics));
672                 wrqu->data.length = sizeof(struct iw_statistics);
673 
674                 /* Check if we need to clear the updated flag */
675                 if (wrqu->data.flags != 0)
676                         stats->qual.updated &= ~IW_QUAL_ALL_UPDATED;
677                 return 0;
678         } else
679                 return -EOPNOTSUPP;
680 }
681 
682 static iw_handler get_handler(struct net_device *dev, unsigned int cmd)
683 {
684         /* Don't "optimise" the following variable, it will crash */
685         unsigned int    index;          /* *MUST* be unsigned */
686         const struct iw_handler_def *handlers = NULL;
687 
688 #ifdef CONFIG_CFG80211_WEXT
689         if (dev->ieee80211_ptr && dev->ieee80211_ptr->wiphy)
690                 handlers = dev->ieee80211_ptr->wiphy->wext;
691 #endif
692 #ifdef CONFIG_WIRELESS_EXT
693         if (dev->wireless_handlers)
694                 handlers = dev->wireless_handlers;
695 #endif
696 
697         if (!handlers)
698                 return NULL;
699 
700         /* Try as a standard command */
701         index = IW_IOCTL_IDX(cmd);
702         if (index < handlers->num_standard)
703                 return handlers->standard[index];
704 
705 #ifdef CONFIG_WEXT_PRIV
706         /* Try as a private command */
707         index = cmd - SIOCIWFIRSTPRIV;
708         if (index < handlers->num_private)
709                 return handlers->private[index];
710 #endif
711 
712         /* Not found */
713         return NULL;
714 }
715 
716 static int ioctl_standard_iw_point(struct iw_point *iwp, unsigned int cmd,
717                                    const struct iw_ioctl_description *descr,
718                                    iw_handler handler, struct net_device *dev,
719                                    struct iw_request_info *info)
720 {
721         int err, extra_size, user_length = 0, essid_compat = 0;
722         char *extra;
723 
724         /* Calculate space needed by arguments. Always allocate
725          * for max space.
726          */
727         extra_size = descr->max_tokens * descr->token_size;
728 
729         /* Check need for ESSID compatibility for WE < 21 */
730         switch (cmd) {
731         case SIOCSIWESSID:
732         case SIOCGIWESSID:
733         case SIOCSIWNICKN:
734         case SIOCGIWNICKN:
735                 if (iwp->length == descr->max_tokens + 1)
736                         essid_compat = 1;
737                 else if (IW_IS_SET(cmd) && (iwp->length != 0)) {
738                         char essid[IW_ESSID_MAX_SIZE + 1];
739                         unsigned int len;
740                         len = iwp->length * descr->token_size;
741 
742                         if (len > IW_ESSID_MAX_SIZE)
743                                 return -EFAULT;
744 
745                         err = copy_from_user(essid, iwp->pointer, len);
746                         if (err)
747                                 return -EFAULT;
748 
749                         if (essid[iwp->length - 1] == '\0')
750                                 essid_compat = 1;
751                 }
752                 break;
753         default:
754                 break;
755         }
756 
757         iwp->length -= essid_compat;
758 
759         /* Check what user space is giving us */
760         if (IW_IS_SET(cmd)) {
761                 /* Check NULL pointer */
762                 if (!iwp->pointer && iwp->length != 0)
763                         return -EFAULT;
764                 /* Check if number of token fits within bounds */
765                 if (iwp->length > descr->max_tokens)
766                         return -E2BIG;
767                 if (iwp->length < descr->min_tokens)
768                         return -EINVAL;
769         } else {
770                 /* Check NULL pointer */
771                 if (!iwp->pointer)
772                         return -EFAULT;
773                 /* Save user space buffer size for checking */
774                 user_length = iwp->length;
775 
776                 /* Don't check if user_length > max to allow forward
777                  * compatibility. The test user_length < min is
778                  * implied by the test at the end.
779                  */
780 
781                 /* Support for very large requests */
782                 if ((descr->flags & IW_DESCR_FLAG_NOMAX) &&
783                     (user_length > descr->max_tokens)) {
784                         /* Allow userspace to GET more than max so
785                          * we can support any size GET requests.
786                          * There is still a limit : -ENOMEM.
787                          */
788                         extra_size = user_length * descr->token_size;
789 
790                         /* Note : user_length is originally a __u16,
791                          * and token_size is controlled by us,
792                          * so extra_size won't get negative and
793                          * won't overflow...
794                          */
795                 }
796         }
797 
798         /* kzalloc() ensures NULL-termination for essid_compat. */
799         extra = kzalloc(extra_size, GFP_KERNEL);
800         if (!extra)
801                 return -ENOMEM;
802 
803         /* If it is a SET, get all the extra data in here */
804         if (IW_IS_SET(cmd) && (iwp->length != 0)) {
805                 if (copy_from_user(extra, iwp->pointer,
806                                    iwp->length *
807                                    descr->token_size)) {
808                         err = -EFAULT;
809                         goto out;
810                 }
811 
812                 if (cmd == SIOCSIWENCODEEXT) {
813                         struct iw_encode_ext *ee = (void *) extra;
814 
815                         if (iwp->length < sizeof(*ee) + ee->key_len) {
816                                 err = -EFAULT;
817                                 goto out;
818                         }
819                 }
820         }
821 
822         if (IW_IS_GET(cmd) && !(descr->flags & IW_DESCR_FLAG_NOMAX)) {
823                 /*
824                  * If this is a GET, but not NOMAX, it means that the extra
825                  * data is not bounded by userspace, but by max_tokens. Thus
826                  * set the length to max_tokens. This matches the extra data
827                  * allocation.
828                  * The driver should fill it with the number of tokens it
829                  * provided, and it may check iwp->length rather than having
830                  * knowledge of max_tokens. If the driver doesn't change the
831                  * iwp->length, this ioctl just copies back max_token tokens
832                  * filled with zeroes. Hopefully the driver isn't claiming
833                  * them to be valid data.
834                  */
835                 iwp->length = descr->max_tokens;
836         }
837 
838         err = handler(dev, info, (union iwreq_data *) iwp, extra);
839 
840         iwp->length += essid_compat;
841 
842         /* If we have something to return to the user */
843         if (!err && IW_IS_GET(cmd)) {
844                 /* Check if there is enough buffer up there */
845                 if (user_length < iwp->length) {
846                         err = -E2BIG;
847                         goto out;
848                 }
849 
850                 if (copy_to_user(iwp->pointer, extra,
851                                  iwp->length *
852                                  descr->token_size)) {
853                         err = -EFAULT;
854                         goto out;
855                 }
856         }
857 
858         /* Generate an event to notify listeners of the change */
859         if ((descr->flags & IW_DESCR_FLAG_EVENT) &&
860             ((err == 0) || (err == -EIWCOMMIT))) {
861                 union iwreq_data *data = (union iwreq_data *) iwp;
862 
863                 if (descr->flags & IW_DESCR_FLAG_RESTRICT)
864                         /* If the event is restricted, don't
865                          * export the payload.
866                          */
867                         wireless_send_event(dev, cmd, data, NULL);
868                 else
869                         wireless_send_event(dev, cmd, data, extra);
870         }
871 
872 out:
873         kfree(extra);
874         return err;
875 }
876 
877 /*
878  * Call the commit handler in the driver
879  * (if exist and if conditions are right)
880  *
881  * Note : our current commit strategy is currently pretty dumb,
882  * but we will be able to improve on that...
883  * The goal is to try to agreagate as many changes as possible
884  * before doing the commit. Drivers that will define a commit handler
885  * are usually those that need a reset after changing parameters, so
886  * we want to minimise the number of reset.
887  * A cool idea is to use a timer : at each "set" command, we re-set the
888  * timer, when the timer eventually fires, we call the driver.
889  * Hopefully, more on that later.
890  *
891  * Also, I'm waiting to see how many people will complain about the
892  * netif_running(dev) test. I'm open on that one...
893  * Hopefully, the driver will remember to do a commit in "open()" ;-)
894  */
895 int call_commit_handler(struct net_device *dev)
896 {
897 #ifdef CONFIG_WIRELESS_EXT
898         if ((netif_running(dev)) &&
899            (dev->wireless_handlers->standard[0] != NULL))
900                 /* Call the commit handler on the driver */
901                 return dev->wireless_handlers->standard[0](dev, NULL,
902                                                            NULL, NULL);
903         else
904                 return 0;               /* Command completed successfully */
905 #else
906         /* cfg80211 has no commit */
907         return 0;
908 #endif
909 }
910 
911 /*
912  * Main IOCTl dispatcher.
913  * Check the type of IOCTL and call the appropriate wrapper...
914  */
915 static int wireless_process_ioctl(struct net *net, struct iwreq *iwr,
916                                   unsigned int cmd,
917                                   struct iw_request_info *info,
918                                   wext_ioctl_func standard,
919                                   wext_ioctl_func private)
920 {
921         struct net_device *dev;
922         iw_handler      handler;
923 
924         /* Permissions are already checked in dev_ioctl() before calling us.
925          * The copy_to/from_user() of ifr is also dealt with in there */
926 
927         /* Make sure the device exist */
928         if ((dev = __dev_get_by_name(net, iwr->ifr_name)) == NULL)
929                 return -ENODEV;
930 
931         /* A bunch of special cases, then the generic case...
932          * Note that 'cmd' is already filtered in dev_ioctl() with
933          * (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST) */
934         if (cmd == SIOCGIWSTATS)
935                 return standard(dev, iwr, cmd, info,
936                                 &iw_handler_get_iwstats);
937 
938 #ifdef CONFIG_WEXT_PRIV
939         if (cmd == SIOCGIWPRIV && dev->wireless_handlers)
940                 return standard(dev, iwr, cmd, info,
941                                 iw_handler_get_private);
942 #endif
943 
944         /* Basic check */
945         if (!netif_device_present(dev))
946                 return -ENODEV;
947 
948         /* New driver API : try to find the handler */
949         handler = get_handler(dev, cmd);
950         if (handler) {
951                 /* Standard and private are not the same */
952                 if (cmd < SIOCIWFIRSTPRIV)
953                         return standard(dev, iwr, cmd, info, handler);
954                 else if (private)
955                         return private(dev, iwr, cmd, info, handler);
956         }
957         return -EOPNOTSUPP;
958 }
959 
960 /* If command is `set a parameter', or `get the encoding parameters',
961  * check if the user has the right to do it.
962  */
963 static int wext_permission_check(unsigned int cmd)
964 {
965         if ((IW_IS_SET(cmd) || cmd == SIOCGIWENCODE ||
966              cmd == SIOCGIWENCODEEXT) &&
967             !capable(CAP_NET_ADMIN))
968                 return -EPERM;
969 
970         return 0;
971 }
972 
973 /* entry point from dev ioctl */
974 static int wext_ioctl_dispatch(struct net *net, struct iwreq *iwr,
975                                unsigned int cmd, struct iw_request_info *info,
976                                wext_ioctl_func standard,
977                                wext_ioctl_func private)
978 {
979         int ret = wext_permission_check(cmd);
980 
981         if (ret)
982                 return ret;
983 
984         dev_load(net, iwr->ifr_name);
985         rtnl_lock();
986         ret = wireless_process_ioctl(net, iwr, cmd, info, standard, private);
987         rtnl_unlock();
988 
989         return ret;
990 }
991 
992 /*
993  * Wrapper to call a standard Wireless Extension handler.
994  * We do various checks and also take care of moving data between
995  * user space and kernel space.
996  */
997 static int ioctl_standard_call(struct net_device *      dev,
998                                struct iwreq             *iwr,
999                                unsigned int             cmd,
1000                                struct iw_request_info   *info,
1001                                iw_handler               handler)
1002 {
1003         const struct iw_ioctl_description *     descr;
1004         int                                     ret = -EINVAL;
1005 
1006         /* Get the description of the IOCTL */
1007         if (IW_IOCTL_IDX(cmd) >= standard_ioctl_num)
1008                 return -EOPNOTSUPP;
1009         descr = &(standard_ioctl[IW_IOCTL_IDX(cmd)]);
1010 
1011         /* Check if we have a pointer to user space data or not */
1012         if (descr->header_type != IW_HEADER_TYPE_POINT) {
1013 
1014                 /* No extra arguments. Trivial to handle */
1015                 ret = handler(dev, info, &(iwr->u), NULL);
1016 
1017                 /* Generate an event to notify listeners of the change */
1018                 if ((descr->flags & IW_DESCR_FLAG_EVENT) &&
1019                    ((ret == 0) || (ret == -EIWCOMMIT)))
1020                         wireless_send_event(dev, cmd, &(iwr->u), NULL);
1021         } else {
1022                 ret = ioctl_standard_iw_point(&iwr->u.data, cmd, descr,
1023                                               handler, dev, info);
1024         }
1025 
1026         /* Call commit handler if needed and defined */
1027         if (ret == -EIWCOMMIT)
1028                 ret = call_commit_handler(dev);
1029 
1030         /* Here, we will generate the appropriate event if needed */
1031 
1032         return ret;
1033 }
1034 
1035 
1036 int wext_handle_ioctl(struct net *net, unsigned int cmd, void __user *arg)
1037 {
1038         struct iw_request_info info = { .cmd = cmd, .flags = 0 };
1039         struct iwreq iwr;
1040         int ret;
1041 
1042         if (copy_from_user(&iwr, arg, sizeof(iwr)))
1043                 return -EFAULT;
1044 
1045         iwr.ifr_name[sizeof(iwr.ifr_name) - 1] = 0;
1046 
1047         ret = wext_ioctl_dispatch(net, &iwr, cmd, &info,
1048                                   ioctl_standard_call,
1049                                   ioctl_private_call);
1050         if (ret >= 0 &&
1051             IW_IS_GET(cmd) &&
1052             copy_to_user(arg, &iwr, sizeof(struct iwreq)))
1053                 return -EFAULT;
1054 
1055         return ret;
1056 }
1057 
1058 #ifdef CONFIG_COMPAT
1059 static int compat_standard_call(struct net_device       *dev,
1060                                 struct iwreq            *iwr,
1061                                 unsigned int            cmd,
1062                                 struct iw_request_info  *info,
1063                                 iw_handler              handler)
1064 {
1065         const struct iw_ioctl_description *descr;
1066         struct compat_iw_point *iwp_compat;
1067         struct iw_point iwp;
1068         int err;
1069 
1070         descr = standard_ioctl + IW_IOCTL_IDX(cmd);
1071 
1072         if (descr->header_type != IW_HEADER_TYPE_POINT)
1073                 return ioctl_standard_call(dev, iwr, cmd, info, handler);
1074 
1075         iwp_compat = (struct compat_iw_point *) &iwr->u.data;
1076         iwp.pointer = compat_ptr(iwp_compat->pointer);
1077         iwp.length = iwp_compat->length;
1078         iwp.flags = iwp_compat->flags;
1079 
1080         err = ioctl_standard_iw_point(&iwp, cmd, descr, handler, dev, info);
1081 
1082         iwp_compat->pointer = ptr_to_compat(iwp.pointer);
1083         iwp_compat->length = iwp.length;
1084         iwp_compat->flags = iwp.flags;
1085 
1086         return err;
1087 }
1088 
1089 int compat_wext_handle_ioctl(struct net *net, unsigned int cmd,
1090                              unsigned long arg)
1091 {
1092         void __user *argp = (void __user *)arg;
1093         struct iw_request_info info;
1094         struct iwreq iwr;
1095         char *colon;
1096         int ret;
1097 
1098         if (copy_from_user(&iwr, argp, sizeof(struct iwreq)))
1099                 return -EFAULT;
1100 
1101         iwr.ifr_name[IFNAMSIZ-1] = 0;
1102         colon = strchr(iwr.ifr_name, ':');
1103         if (colon)
1104                 *colon = 0;
1105 
1106         info.cmd = cmd;
1107         info.flags = IW_REQUEST_FLAG_COMPAT;
1108 
1109         ret = wext_ioctl_dispatch(net, &iwr, cmd, &info,
1110                                   compat_standard_call,
1111                                   compat_private_call);
1112 
1113         if (ret >= 0 &&
1114             IW_IS_GET(cmd) &&
1115             copy_to_user(argp, &iwr, sizeof(struct iwreq)))
1116                 return -EFAULT;
1117 
1118         return ret;
1119 }
1120 #endif
1121 
1122 char *iwe_stream_add_event(struct iw_request_info *info, char *stream,
1123                            char *ends, struct iw_event *iwe, int event_len)
1124 {
1125         int lcp_len = iwe_stream_lcp_len(info);
1126 
1127         event_len = iwe_stream_event_len_adjust(info, event_len);
1128 
1129         /* Check if it's possible */
1130         if (likely((stream + event_len) < ends)) {
1131                 iwe->len = event_len;
1132                 /* Beware of alignement issues on 64 bits */
1133                 memcpy(stream, (char *) iwe, IW_EV_LCP_PK_LEN);
1134                 memcpy(stream + lcp_len, &iwe->u,
1135                        event_len - lcp_len);
1136                 stream += event_len;
1137         }
1138 
1139         return stream;
1140 }
1141 EXPORT_SYMBOL(iwe_stream_add_event);
1142 
1143 char *iwe_stream_add_point(struct iw_request_info *info, char *stream,
1144                            char *ends, struct iw_event *iwe, char *extra)
1145 {
1146         int event_len = iwe_stream_point_len(info) + iwe->u.data.length;
1147         int point_len = iwe_stream_point_len(info);
1148         int lcp_len   = iwe_stream_lcp_len(info);
1149 
1150         /* Check if it's possible */
1151         if (likely((stream + event_len) < ends)) {
1152                 iwe->len = event_len;
1153                 memcpy(stream, (char *) iwe, IW_EV_LCP_PK_LEN);
1154                 memcpy(stream + lcp_len,
1155                        ((char *) &iwe->u) + IW_EV_POINT_OFF,
1156                        IW_EV_POINT_PK_LEN - IW_EV_LCP_PK_LEN);
1157                 if (iwe->u.data.length && extra)
1158                         memcpy(stream + point_len, extra, iwe->u.data.length);
1159                 stream += event_len;
1160         }
1161 
1162         return stream;
1163 }
1164 EXPORT_SYMBOL(iwe_stream_add_point);
1165 
1166 char *iwe_stream_add_value(struct iw_request_info *info, char *event,
1167                            char *value, char *ends, struct iw_event *iwe,
1168                            int event_len)
1169 {
1170         int lcp_len = iwe_stream_lcp_len(info);
1171 
1172         /* Don't duplicate LCP */
1173         event_len -= IW_EV_LCP_LEN;
1174 
1175         /* Check if it's possible */
1176         if (likely((value + event_len) < ends)) {
1177                 /* Add new value */
1178                 memcpy(value, &iwe->u, event_len);
1179                 value += event_len;
1180                 /* Patch LCP */
1181                 iwe->len = value - event;
1182                 memcpy(event, (char *) iwe, lcp_len);
1183         }
1184 
1185         return value;
1186 }
1187 EXPORT_SYMBOL(iwe_stream_add_value);
1188 

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