2 * This file implement the Wireless Extensions core API.
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>
8 * (As all part of the Linux kernel, this file is GPL)
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>
21 #include <net/net_namespace.h>
23 typedef int (*wext_ioctl_func)(struct net_device *, struct iwreq *,
24 unsigned int, struct iw_request_info *,
29 * Meta-data about all the standard Wireless Extension request we
32 static const struct iw_ioctl_description standard_ioctl[] = {
33 [IW_IOCTL_IDX(SIOCSIWCOMMIT)] = {
34 .header_type = IW_HEADER_TYPE_NULL,
36 [IW_IOCTL_IDX(SIOCGIWNAME)] = {
37 .header_type = IW_HEADER_TYPE_CHAR,
38 .flags = IW_DESCR_FLAG_DUMP,
40 [IW_IOCTL_IDX(SIOCSIWNWID)] = {
41 .header_type = IW_HEADER_TYPE_PARAM,
42 .flags = IW_DESCR_FLAG_EVENT,
44 [IW_IOCTL_IDX(SIOCGIWNWID)] = {
45 .header_type = IW_HEADER_TYPE_PARAM,
46 .flags = IW_DESCR_FLAG_DUMP,
48 [IW_IOCTL_IDX(SIOCSIWFREQ)] = {
49 .header_type = IW_HEADER_TYPE_FREQ,
50 .flags = IW_DESCR_FLAG_EVENT,
52 [IW_IOCTL_IDX(SIOCGIWFREQ)] = {
53 .header_type = IW_HEADER_TYPE_FREQ,
54 .flags = IW_DESCR_FLAG_DUMP,
56 [IW_IOCTL_IDX(SIOCSIWMODE)] = {
57 .header_type = IW_HEADER_TYPE_UINT,
58 .flags = IW_DESCR_FLAG_EVENT,
60 [IW_IOCTL_IDX(SIOCGIWMODE)] = {
61 .header_type = IW_HEADER_TYPE_UINT,
62 .flags = IW_DESCR_FLAG_DUMP,
64 [IW_IOCTL_IDX(SIOCSIWSENS)] = {
65 .header_type = IW_HEADER_TYPE_PARAM,
67 [IW_IOCTL_IDX(SIOCGIWSENS)] = {
68 .header_type = IW_HEADER_TYPE_PARAM,
70 [IW_IOCTL_IDX(SIOCSIWRANGE)] = {
71 .header_type = IW_HEADER_TYPE_NULL,
73 [IW_IOCTL_IDX(SIOCGIWRANGE)] = {
74 .header_type = IW_HEADER_TYPE_POINT,
76 .max_tokens = sizeof(struct iw_range),
77 .flags = IW_DESCR_FLAG_DUMP,
79 [IW_IOCTL_IDX(SIOCSIWPRIV)] = {
80 .header_type = IW_HEADER_TYPE_NULL,
82 [IW_IOCTL_IDX(SIOCGIWPRIV)] = { /* (handled directly by us) */
83 .header_type = IW_HEADER_TYPE_POINT,
84 .token_size = sizeof(struct iw_priv_args),
86 .flags = IW_DESCR_FLAG_NOMAX,
88 [IW_IOCTL_IDX(SIOCSIWSTATS)] = {
89 .header_type = IW_HEADER_TYPE_NULL,
91 [IW_IOCTL_IDX(SIOCGIWSTATS)] = { /* (handled directly by us) */
92 .header_type = IW_HEADER_TYPE_POINT,
94 .max_tokens = sizeof(struct iw_statistics),
95 .flags = IW_DESCR_FLAG_DUMP,
97 [IW_IOCTL_IDX(SIOCSIWSPY)] = {
98 .header_type = IW_HEADER_TYPE_POINT,
99 .token_size = sizeof(struct sockaddr),
100 .max_tokens = IW_MAX_SPY,
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,
108 [IW_IOCTL_IDX(SIOCSIWTHRSPY)] = {
109 .header_type = IW_HEADER_TYPE_POINT,
110 .token_size = sizeof(struct iw_thrspy),
114 [IW_IOCTL_IDX(SIOCGIWTHRSPY)] = {
115 .header_type = IW_HEADER_TYPE_POINT,
116 .token_size = sizeof(struct iw_thrspy),
120 [IW_IOCTL_IDX(SIOCSIWAP)] = {
121 .header_type = IW_HEADER_TYPE_ADDR,
123 [IW_IOCTL_IDX(SIOCGIWAP)] = {
124 .header_type = IW_HEADER_TYPE_ADDR,
125 .flags = IW_DESCR_FLAG_DUMP,
127 [IW_IOCTL_IDX(SIOCSIWMLME)] = {
128 .header_type = IW_HEADER_TYPE_POINT,
130 .min_tokens = sizeof(struct iw_mlme),
131 .max_tokens = sizeof(struct iw_mlme),
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,
140 [IW_IOCTL_IDX(SIOCSIWSCAN)] = {
141 .header_type = IW_HEADER_TYPE_POINT,
144 .max_tokens = sizeof(struct iw_scan_req),
146 [IW_IOCTL_IDX(SIOCGIWSCAN)] = {
147 .header_type = IW_HEADER_TYPE_POINT,
149 .max_tokens = IW_SCAN_MAX_DATA,
150 .flags = IW_DESCR_FLAG_NOMAX,
152 [IW_IOCTL_IDX(SIOCSIWESSID)] = {
153 .header_type = IW_HEADER_TYPE_POINT,
155 .max_tokens = IW_ESSID_MAX_SIZE,
156 .flags = IW_DESCR_FLAG_EVENT,
158 [IW_IOCTL_IDX(SIOCGIWESSID)] = {
159 .header_type = IW_HEADER_TYPE_POINT,
161 .max_tokens = IW_ESSID_MAX_SIZE,
162 .flags = IW_DESCR_FLAG_DUMP,
164 [IW_IOCTL_IDX(SIOCSIWNICKN)] = {
165 .header_type = IW_HEADER_TYPE_POINT,
167 .max_tokens = IW_ESSID_MAX_SIZE,
169 [IW_IOCTL_IDX(SIOCGIWNICKN)] = {
170 .header_type = IW_HEADER_TYPE_POINT,
172 .max_tokens = IW_ESSID_MAX_SIZE,
174 [IW_IOCTL_IDX(SIOCSIWRATE)] = {
175 .header_type = IW_HEADER_TYPE_PARAM,
177 [IW_IOCTL_IDX(SIOCGIWRATE)] = {
178 .header_type = IW_HEADER_TYPE_PARAM,
180 [IW_IOCTL_IDX(SIOCSIWRTS)] = {
181 .header_type = IW_HEADER_TYPE_PARAM,
183 [IW_IOCTL_IDX(SIOCGIWRTS)] = {
184 .header_type = IW_HEADER_TYPE_PARAM,
186 [IW_IOCTL_IDX(SIOCSIWFRAG)] = {
187 .header_type = IW_HEADER_TYPE_PARAM,
189 [IW_IOCTL_IDX(SIOCGIWFRAG)] = {
190 .header_type = IW_HEADER_TYPE_PARAM,
192 [IW_IOCTL_IDX(SIOCSIWTXPOW)] = {
193 .header_type = IW_HEADER_TYPE_PARAM,
195 [IW_IOCTL_IDX(SIOCGIWTXPOW)] = {
196 .header_type = IW_HEADER_TYPE_PARAM,
198 [IW_IOCTL_IDX(SIOCSIWRETRY)] = {
199 .header_type = IW_HEADER_TYPE_PARAM,
201 [IW_IOCTL_IDX(SIOCGIWRETRY)] = {
202 .header_type = IW_HEADER_TYPE_PARAM,
204 [IW_IOCTL_IDX(SIOCSIWENCODE)] = {
205 .header_type = IW_HEADER_TYPE_POINT,
207 .max_tokens = IW_ENCODING_TOKEN_MAX,
208 .flags = IW_DESCR_FLAG_EVENT | IW_DESCR_FLAG_RESTRICT,
210 [IW_IOCTL_IDX(SIOCGIWENCODE)] = {
211 .header_type = IW_HEADER_TYPE_POINT,
213 .max_tokens = IW_ENCODING_TOKEN_MAX,
214 .flags = IW_DESCR_FLAG_DUMP | IW_DESCR_FLAG_RESTRICT,
216 [IW_IOCTL_IDX(SIOCSIWPOWER)] = {
217 .header_type = IW_HEADER_TYPE_PARAM,
219 [IW_IOCTL_IDX(SIOCGIWPOWER)] = {
220 .header_type = IW_HEADER_TYPE_PARAM,
222 [IW_IOCTL_IDX(SIOCSIWGENIE)] = {
223 .header_type = IW_HEADER_TYPE_POINT,
225 .max_tokens = IW_GENERIC_IE_MAX,
227 [IW_IOCTL_IDX(SIOCGIWGENIE)] = {
228 .header_type = IW_HEADER_TYPE_POINT,
230 .max_tokens = IW_GENERIC_IE_MAX,
232 [IW_IOCTL_IDX(SIOCSIWAUTH)] = {
233 .header_type = IW_HEADER_TYPE_PARAM,
235 [IW_IOCTL_IDX(SIOCGIWAUTH)] = {
236 .header_type = IW_HEADER_TYPE_PARAM,
238 [IW_IOCTL_IDX(SIOCSIWENCODEEXT)] = {
239 .header_type = IW_HEADER_TYPE_POINT,
241 .min_tokens = sizeof(struct iw_encode_ext),
242 .max_tokens = sizeof(struct iw_encode_ext) +
243 IW_ENCODING_TOKEN_MAX,
245 [IW_IOCTL_IDX(SIOCGIWENCODEEXT)] = {
246 .header_type = IW_HEADER_TYPE_POINT,
248 .min_tokens = sizeof(struct iw_encode_ext),
249 .max_tokens = sizeof(struct iw_encode_ext) +
250 IW_ENCODING_TOKEN_MAX,
252 [IW_IOCTL_IDX(SIOCSIWPMKSA)] = {
253 .header_type = IW_HEADER_TYPE_POINT,
255 .min_tokens = sizeof(struct iw_pmksa),
256 .max_tokens = sizeof(struct iw_pmksa),
259 static const unsigned int standard_ioctl_num = ARRAY_SIZE(standard_ioctl);
262 * Meta-data about all the additional standard Wireless Extension events
265 static const struct iw_ioctl_description standard_event[] = {
266 [IW_EVENT_IDX(IWEVTXDROP)] = {
267 .header_type = IW_HEADER_TYPE_ADDR,
269 [IW_EVENT_IDX(IWEVQUAL)] = {
270 .header_type = IW_HEADER_TYPE_QUAL,
272 [IW_EVENT_IDX(IWEVCUSTOM)] = {
273 .header_type = IW_HEADER_TYPE_POINT,
275 .max_tokens = IW_CUSTOM_MAX,
277 [IW_EVENT_IDX(IWEVREGISTERED)] = {
278 .header_type = IW_HEADER_TYPE_ADDR,
280 [IW_EVENT_IDX(IWEVEXPIRED)] = {
281 .header_type = IW_HEADER_TYPE_ADDR,
283 [IW_EVENT_IDX(IWEVGENIE)] = {
284 .header_type = IW_HEADER_TYPE_POINT,
286 .max_tokens = IW_GENERIC_IE_MAX,
288 [IW_EVENT_IDX(IWEVMICHAELMICFAILURE)] = {
289 .header_type = IW_HEADER_TYPE_POINT,
291 .max_tokens = sizeof(struct iw_michaelmicfailure),
293 [IW_EVENT_IDX(IWEVASSOCREQIE)] = {
294 .header_type = IW_HEADER_TYPE_POINT,
296 .max_tokens = IW_GENERIC_IE_MAX,
298 [IW_EVENT_IDX(IWEVASSOCRESPIE)] = {
299 .header_type = IW_HEADER_TYPE_POINT,
301 .max_tokens = IW_GENERIC_IE_MAX,
303 [IW_EVENT_IDX(IWEVPMKIDCAND)] = {
304 .header_type = IW_HEADER_TYPE_POINT,
306 .max_tokens = sizeof(struct iw_pmkid_cand),
309 static const unsigned int standard_event_num = ARRAY_SIZE(standard_event);
311 /* Size (in bytes) of various events */
312 static const int event_type_size[] = {
313 IW_EV_LCP_LEN, /* IW_HEADER_TYPE_NULL */
315 IW_EV_CHAR_LEN, /* IW_HEADER_TYPE_CHAR */
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 */
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 */
327 static const int compat_event_type_size[] = {
328 IW_EV_COMPAT_LCP_LEN, /* IW_HEADER_TYPE_NULL */
330 IW_EV_COMPAT_CHAR_LEN, /* IW_HEADER_TYPE_CHAR */
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 */
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 */
345 static void wireless_nlevent_flush(void)
353 while ((skb = skb_dequeue(&net->wext_nlevents)))
354 rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL,
359 static int wext_netdev_notifier_call(struct notifier_block *nb,
360 unsigned long state, void *ptr)
363 * When a netdev changes state in any way, flush all pending messages
364 * to avoid them going out in a strange order, e.g. RTM_NEWLINK after
365 * RTM_DELLINK, or with IFF_UP after without IFF_UP during dev_close()
366 * or similar - all of which could otherwise happen due to delays from
369 wireless_nlevent_flush();
374 static struct notifier_block wext_netdev_notifier = {
375 .notifier_call = wext_netdev_notifier_call,
378 static int __net_init wext_pernet_init(struct net *net)
380 skb_queue_head_init(&net->wext_nlevents);
384 static void __net_exit wext_pernet_exit(struct net *net)
386 skb_queue_purge(&net->wext_nlevents);
389 static struct pernet_operations wext_pernet_ops = {
390 .init = wext_pernet_init,
391 .exit = wext_pernet_exit,
394 static int __init wireless_nlevent_init(void)
396 int err = register_pernet_subsys(&wext_pernet_ops);
401 return register_netdevice_notifier(&wext_netdev_notifier);
404 subsys_initcall(wireless_nlevent_init);
406 /* Process events generated by the wireless layer or the driver. */
407 static void wireless_nlevent_process(struct work_struct *work)
410 wireless_nlevent_flush();
414 static DECLARE_WORK(wireless_nlevent_work, wireless_nlevent_process);
416 static struct nlmsghdr *rtnetlink_ifinfo_prep(struct net_device *dev,
420 struct nlmsghdr *nlh;
422 nlh = nlmsg_put(skb, 0, 0, RTM_NEWLINK, sizeof(*r), 0);
427 r->ifi_family = AF_UNSPEC;
429 r->ifi_type = dev->type;
430 r->ifi_index = dev->ifindex;
431 r->ifi_flags = dev_get_flags(dev);
432 r->ifi_change = 0; /* Wireless changes don't affect those flags */
434 if (nla_put_string(skb, IFLA_IFNAME, dev->name))
435 goto nla_put_failure;
439 nlmsg_cancel(skb, nlh);
445 * Main event dispatcher. Called from other parts and drivers.
446 * Send the event on the appropriate channels.
447 * May be called from interrupt context.
449 void wireless_send_event(struct net_device * dev,
451 union iwreq_data * wrqu,
454 const struct iw_ioctl_description * descr = NULL;
456 struct iw_event *event; /* Mallocated whole event */
457 int event_len; /* Its size */
458 int hdr_len; /* Size of the event header */
459 int wrqu_off = 0; /* Offset in wrqu */
460 /* Don't "optimise" the following variable, it will crash */
461 unsigned int cmd_index; /* *MUST* be unsigned */
463 struct nlmsghdr *nlh;
466 struct __compat_iw_event *compat_event;
467 struct compat_iw_point compat_wrqu;
468 struct sk_buff *compskb;
472 * Nothing in the kernel sends scan events with data, be safe.
473 * This is necessary because we cannot fix up scan event data
474 * for compat, due to being contained in 'extra', but normally
475 * applications are required to retrieve the scan data anyway
476 * and no data is included in the event, this codifies that
479 if (WARN_ON(cmd == SIOCGIWSCAN && extra))
482 /* Get the description of the Event */
483 if (cmd <= SIOCIWLAST) {
484 cmd_index = IW_IOCTL_IDX(cmd);
485 if (cmd_index < standard_ioctl_num)
486 descr = &(standard_ioctl[cmd_index]);
488 cmd_index = IW_EVENT_IDX(cmd);
489 if (cmd_index < standard_event_num)
490 descr = &(standard_event[cmd_index]);
492 /* Don't accept unknown events */
494 /* Note : we don't return an error to the driver, because
495 * the driver would not know what to do about it. It can't
496 * return an error to the user, because the event is not
497 * initiated by a user request.
498 * The best the driver could do is to log an error message.
499 * We will do it ourselves instead...
501 netdev_err(dev, "(WE) : Invalid/Unknown Wireless Event (0x%04X)\n",
506 /* Check extra parameters and set extra_len */
507 if (descr->header_type == IW_HEADER_TYPE_POINT) {
508 /* Check if number of token fits within bounds */
509 if (wrqu->data.length > descr->max_tokens) {
510 netdev_err(dev, "(WE) : Wireless Event (cmd=0x%04X) too big (%d)\n",
511 cmd, wrqu->data.length);
514 if (wrqu->data.length < descr->min_tokens) {
515 netdev_err(dev, "(WE) : Wireless Event (cmd=0x%04X) too small (%d)\n",
516 cmd, wrqu->data.length);
519 /* Calculate extra_len - extra is NULL for restricted events */
521 extra_len = wrqu->data.length * descr->token_size;
522 /* Always at an offset in wrqu */
523 wrqu_off = IW_EV_POINT_OFF;
526 /* Total length of the event */
527 hdr_len = event_type_size[descr->header_type];
528 event_len = hdr_len + extra_len;
531 * The problem for 64/32 bit.
533 * On 64-bit, a regular event is laid out as follows:
534 * | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 |
535 * | event.len | event.cmd | p a d d i n g |
536 * | wrqu data ... (with the correct size) |
538 * This padding exists because we manipulate event->u,
539 * and 'event' is not packed.
541 * An iw_point event is laid out like this instead:
542 * | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 |
543 * | event.len | event.cmd | p a d d i n g |
544 * | iwpnt.len | iwpnt.flg | p a d d i n g |
547 * The second padding exists because struct iw_point is extended,
548 * but this depends on the platform...
550 * On 32-bit, all the padding shouldn't be there.
553 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
557 /* Send via the RtNetlink event channel */
558 nlh = rtnetlink_ifinfo_prep(dev, skb);
564 /* Add the wireless events in the netlink packet */
565 nla = nla_reserve(skb, IFLA_WIRELESS, event_len);
570 event = nla_data(nla);
572 /* Fill event - first clear to avoid data leaking */
573 memset(event, 0, hdr_len);
574 event->len = event_len;
576 memcpy(&event->u, ((char *) wrqu) + wrqu_off, hdr_len - IW_EV_LCP_LEN);
578 memcpy(((char *) event) + hdr_len, extra, extra_len);
582 hdr_len = compat_event_type_size[descr->header_type];
583 event_len = hdr_len + extra_len;
585 compskb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
591 /* Send via the RtNetlink event channel */
592 nlh = rtnetlink_ifinfo_prep(dev, compskb);
599 /* Add the wireless events in the netlink packet */
600 nla = nla_reserve(compskb, IFLA_WIRELESS, event_len);
606 compat_event = nla_data(nla);
608 compat_event->len = event_len;
609 compat_event->cmd = cmd;
610 if (descr->header_type == IW_HEADER_TYPE_POINT) {
611 compat_wrqu.length = wrqu->data.length;
612 compat_wrqu.flags = wrqu->data.flags;
613 memcpy(&compat_event->pointer,
614 ((char *) &compat_wrqu) + IW_EV_COMPAT_POINT_OFF,
615 hdr_len - IW_EV_COMPAT_LCP_LEN);
617 memcpy(((char *) compat_event) + hdr_len,
620 /* extra_len must be zero, so no if (extra) needed */
621 memcpy(&compat_event->pointer, wrqu,
622 hdr_len - IW_EV_COMPAT_LCP_LEN);
625 nlmsg_end(compskb, nlh);
627 skb_shinfo(skb)->frag_list = compskb;
629 skb_queue_tail(&dev_net(dev)->wext_nlevents, skb);
630 schedule_work(&wireless_nlevent_work);
632 EXPORT_SYMBOL(wireless_send_event);
638 struct iw_statistics *get_wireless_stats(struct net_device *dev)
640 #ifdef CONFIG_WIRELESS_EXT
641 if ((dev->wireless_handlers != NULL) &&
642 (dev->wireless_handlers->get_wireless_stats != NULL))
643 return dev->wireless_handlers->get_wireless_stats(dev);
646 #ifdef CONFIG_CFG80211_WEXT
647 if (dev->ieee80211_ptr &&
648 dev->ieee80211_ptr->wiphy &&
649 dev->ieee80211_ptr->wiphy->wext &&
650 dev->ieee80211_ptr->wiphy->wext->get_wireless_stats)
651 return dev->ieee80211_ptr->wiphy->wext->get_wireless_stats(dev);
658 static int iw_handler_get_iwstats(struct net_device * dev,
659 struct iw_request_info * info,
660 union iwreq_data * wrqu,
663 /* Get stats from the driver */
664 struct iw_statistics *stats;
666 stats = get_wireless_stats(dev);
668 /* Copy statistics to extra */
669 memcpy(extra, stats, sizeof(struct iw_statistics));
670 wrqu->data.length = sizeof(struct iw_statistics);
672 /* Check if we need to clear the updated flag */
673 if (wrqu->data.flags != 0)
674 stats->qual.updated &= ~IW_QUAL_ALL_UPDATED;
680 static iw_handler get_handler(struct net_device *dev, unsigned int cmd)
682 /* Don't "optimise" the following variable, it will crash */
683 unsigned int index; /* *MUST* be unsigned */
684 const struct iw_handler_def *handlers = NULL;
686 #ifdef CONFIG_CFG80211_WEXT
687 if (dev->ieee80211_ptr && dev->ieee80211_ptr->wiphy)
688 handlers = dev->ieee80211_ptr->wiphy->wext;
690 #ifdef CONFIG_WIRELESS_EXT
691 if (dev->wireless_handlers)
692 handlers = dev->wireless_handlers;
698 /* Try as a standard command */
699 index = IW_IOCTL_IDX(cmd);
700 if (index < handlers->num_standard)
701 return handlers->standard[index];
703 #ifdef CONFIG_WEXT_PRIV
704 /* Try as a private command */
705 index = cmd - SIOCIWFIRSTPRIV;
706 if (index < handlers->num_private)
707 return handlers->private[index];
714 static int ioctl_standard_iw_point(struct iw_point *iwp, unsigned int cmd,
715 const struct iw_ioctl_description *descr,
716 iw_handler handler, struct net_device *dev,
717 struct iw_request_info *info)
719 int err, extra_size, user_length = 0, essid_compat = 0;
722 /* Calculate space needed by arguments. Always allocate
725 extra_size = descr->max_tokens * descr->token_size;
727 /* Check need for ESSID compatibility for WE < 21 */
733 if (iwp->length == descr->max_tokens + 1)
735 else if (IW_IS_SET(cmd) && (iwp->length != 0)) {
736 char essid[IW_ESSID_MAX_SIZE + 1];
738 len = iwp->length * descr->token_size;
740 if (len > IW_ESSID_MAX_SIZE)
743 err = copy_from_user(essid, iwp->pointer, len);
747 if (essid[iwp->length - 1] == '\0')
755 iwp->length -= essid_compat;
757 /* Check what user space is giving us */
758 if (IW_IS_SET(cmd)) {
759 /* Check NULL pointer */
760 if (!iwp->pointer && iwp->length != 0)
762 /* Check if number of token fits within bounds */
763 if (iwp->length > descr->max_tokens)
765 if (iwp->length < descr->min_tokens)
768 /* Check NULL pointer */
771 /* Save user space buffer size for checking */
772 user_length = iwp->length;
774 /* Don't check if user_length > max to allow forward
775 * compatibility. The test user_length < min is
776 * implied by the test at the end.
779 /* Support for very large requests */
780 if ((descr->flags & IW_DESCR_FLAG_NOMAX) &&
781 (user_length > descr->max_tokens)) {
782 /* Allow userspace to GET more than max so
783 * we can support any size GET requests.
784 * There is still a limit : -ENOMEM.
786 extra_size = user_length * descr->token_size;
788 /* Note : user_length is originally a __u16,
789 * and token_size is controlled by us,
790 * so extra_size won't get negative and
796 /* kzalloc() ensures NULL-termination for essid_compat. */
797 extra = kzalloc(extra_size, GFP_KERNEL);
801 /* If it is a SET, get all the extra data in here */
802 if (IW_IS_SET(cmd) && (iwp->length != 0)) {
803 if (copy_from_user(extra, iwp->pointer,
805 descr->token_size)) {
810 if (cmd == SIOCSIWENCODEEXT) {
811 struct iw_encode_ext *ee = (void *) extra;
813 if (iwp->length < sizeof(*ee) + ee->key_len) {
820 if (IW_IS_GET(cmd) && !(descr->flags & IW_DESCR_FLAG_NOMAX)) {
822 * If this is a GET, but not NOMAX, it means that the extra
823 * data is not bounded by userspace, but by max_tokens. Thus
824 * set the length to max_tokens. This matches the extra data
826 * The driver should fill it with the number of tokens it
827 * provided, and it may check iwp->length rather than having
828 * knowledge of max_tokens. If the driver doesn't change the
829 * iwp->length, this ioctl just copies back max_token tokens
830 * filled with zeroes. Hopefully the driver isn't claiming
831 * them to be valid data.
833 iwp->length = descr->max_tokens;
836 err = handler(dev, info, (union iwreq_data *) iwp, extra);
838 iwp->length += essid_compat;
840 /* If we have something to return to the user */
841 if (!err && IW_IS_GET(cmd)) {
842 /* Check if there is enough buffer up there */
843 if (user_length < iwp->length) {
848 if (copy_to_user(iwp->pointer, extra,
850 descr->token_size)) {
856 /* Generate an event to notify listeners of the change */
857 if ((descr->flags & IW_DESCR_FLAG_EVENT) &&
858 ((err == 0) || (err == -EIWCOMMIT))) {
859 union iwreq_data *data = (union iwreq_data *) iwp;
861 if (descr->flags & IW_DESCR_FLAG_RESTRICT)
862 /* If the event is restricted, don't
863 * export the payload.
865 wireless_send_event(dev, cmd, data, NULL);
867 wireless_send_event(dev, cmd, data, extra);
876 * Call the commit handler in the driver
877 * (if exist and if conditions are right)
879 * Note : our current commit strategy is currently pretty dumb,
880 * but we will be able to improve on that...
881 * The goal is to try to agreagate as many changes as possible
882 * before doing the commit. Drivers that will define a commit handler
883 * are usually those that need a reset after changing parameters, so
884 * we want to minimise the number of reset.
885 * A cool idea is to use a timer : at each "set" command, we re-set the
886 * timer, when the timer eventually fires, we call the driver.
887 * Hopefully, more on that later.
889 * Also, I'm waiting to see how many people will complain about the
890 * netif_running(dev) test. I'm open on that one...
891 * Hopefully, the driver will remember to do a commit in "open()" ;-)
893 int call_commit_handler(struct net_device *dev)
895 #ifdef CONFIG_WIRELESS_EXT
896 if ((netif_running(dev)) &&
897 (dev->wireless_handlers->standard[0] != NULL))
898 /* Call the commit handler on the driver */
899 return dev->wireless_handlers->standard[0](dev, NULL,
902 return 0; /* Command completed successfully */
904 /* cfg80211 has no commit */
910 * Main IOCTl dispatcher.
911 * Check the type of IOCTL and call the appropriate wrapper...
913 static int wireless_process_ioctl(struct net *net, struct ifreq *ifr,
915 struct iw_request_info *info,
916 wext_ioctl_func standard,
917 wext_ioctl_func private)
919 struct iwreq *iwr = (struct iwreq *) ifr;
920 struct net_device *dev;
923 /* Permissions are already checked in dev_ioctl() before calling us.
924 * The copy_to/from_user() of ifr is also dealt with in there */
926 /* Make sure the device exist */
927 if ((dev = __dev_get_by_name(net, ifr->ifr_name)) == NULL)
930 /* A bunch of special cases, then the generic case...
931 * Note that 'cmd' is already filtered in dev_ioctl() with
932 * (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST) */
933 if (cmd == SIOCGIWSTATS)
934 return standard(dev, iwr, cmd, info,
935 &iw_handler_get_iwstats);
937 #ifdef CONFIG_WEXT_PRIV
938 if (cmd == SIOCGIWPRIV && dev->wireless_handlers)
939 return standard(dev, iwr, cmd, info,
940 iw_handler_get_private);
944 if (!netif_device_present(dev))
947 /* New driver API : try to find the handler */
948 handler = get_handler(dev, cmd);
950 /* Standard and private are not the same */
951 if (cmd < SIOCIWFIRSTPRIV)
952 return standard(dev, iwr, cmd, info, handler);
954 return private(dev, iwr, cmd, info, handler);
956 /* Old driver API : call driver ioctl handler */
957 if (dev->netdev_ops->ndo_do_ioctl)
958 return dev->netdev_ops->ndo_do_ioctl(dev, ifr, cmd);
962 /* If command is `set a parameter', or `get the encoding parameters',
963 * check if the user has the right to do it.
965 static int wext_permission_check(unsigned int cmd)
967 if ((IW_IS_SET(cmd) || cmd == SIOCGIWENCODE ||
968 cmd == SIOCGIWENCODEEXT) &&
969 !capable(CAP_NET_ADMIN))
975 /* entry point from dev ioctl */
976 static int wext_ioctl_dispatch(struct net *net, struct ifreq *ifr,
977 unsigned int cmd, struct iw_request_info *info,
978 wext_ioctl_func standard,
979 wext_ioctl_func private)
981 int ret = wext_permission_check(cmd);
986 dev_load(net, ifr->ifr_name);
988 ret = wireless_process_ioctl(net, ifr, cmd, info, standard, private);
995 * Wrapper to call a standard Wireless Extension handler.
996 * We do various checks and also take care of moving data between
997 * user space and kernel space.
999 static int ioctl_standard_call(struct net_device * dev,
1002 struct iw_request_info *info,
1005 const struct iw_ioctl_description * descr;
1008 /* Get the description of the IOCTL */
1009 if (IW_IOCTL_IDX(cmd) >= standard_ioctl_num)
1011 descr = &(standard_ioctl[IW_IOCTL_IDX(cmd)]);
1013 /* Check if we have a pointer to user space data or not */
1014 if (descr->header_type != IW_HEADER_TYPE_POINT) {
1016 /* No extra arguments. Trivial to handle */
1017 ret = handler(dev, info, &(iwr->u), NULL);
1019 /* Generate an event to notify listeners of the change */
1020 if ((descr->flags & IW_DESCR_FLAG_EVENT) &&
1021 ((ret == 0) || (ret == -EIWCOMMIT)))
1022 wireless_send_event(dev, cmd, &(iwr->u), NULL);
1024 ret = ioctl_standard_iw_point(&iwr->u.data, cmd, descr,
1025 handler, dev, info);
1028 /* Call commit handler if needed and defined */
1029 if (ret == -EIWCOMMIT)
1030 ret = call_commit_handler(dev);
1032 /* Here, we will generate the appropriate event if needed */
1038 int wext_handle_ioctl(struct net *net, struct ifreq *ifr, unsigned int cmd,
1041 struct iw_request_info info = { .cmd = cmd, .flags = 0 };
1044 ret = wext_ioctl_dispatch(net, ifr, cmd, &info,
1045 ioctl_standard_call,
1046 ioctl_private_call);
1049 copy_to_user(arg, ifr, sizeof(struct iwreq)))
1055 #ifdef CONFIG_COMPAT
1056 static int compat_standard_call(struct net_device *dev,
1059 struct iw_request_info *info,
1062 const struct iw_ioctl_description *descr;
1063 struct compat_iw_point *iwp_compat;
1064 struct iw_point iwp;
1067 descr = standard_ioctl + IW_IOCTL_IDX(cmd);
1069 if (descr->header_type != IW_HEADER_TYPE_POINT)
1070 return ioctl_standard_call(dev, iwr, cmd, info, handler);
1072 iwp_compat = (struct compat_iw_point *) &iwr->u.data;
1073 iwp.pointer = compat_ptr(iwp_compat->pointer);
1074 iwp.length = iwp_compat->length;
1075 iwp.flags = iwp_compat->flags;
1077 err = ioctl_standard_iw_point(&iwp, cmd, descr, handler, dev, info);
1079 iwp_compat->pointer = ptr_to_compat(iwp.pointer);
1080 iwp_compat->length = iwp.length;
1081 iwp_compat->flags = iwp.flags;
1086 int compat_wext_handle_ioctl(struct net *net, unsigned int cmd,
1089 void __user *argp = (void __user *)arg;
1090 struct iw_request_info info;
1095 if (copy_from_user(&iwr, argp, sizeof(struct iwreq)))
1098 iwr.ifr_name[IFNAMSIZ-1] = 0;
1099 colon = strchr(iwr.ifr_name, ':');
1104 info.flags = IW_REQUEST_FLAG_COMPAT;
1106 ret = wext_ioctl_dispatch(net, (struct ifreq *) &iwr, cmd, &info,
1107 compat_standard_call,
1108 compat_private_call);
1112 copy_to_user(argp, &iwr, sizeof(struct iwreq)))