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 void wireless_nlevent_flush(void)
353 while ((skb = skb_dequeue(&net->wext_nlevents)))
354 rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL,
358 EXPORT_SYMBOL_GPL(wireless_nlevent_flush);
360 static int wext_netdev_notifier_call(struct notifier_block *nb,
361 unsigned long state, void *ptr)
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
370 wireless_nlevent_flush();
375 static struct notifier_block wext_netdev_notifier = {
376 .notifier_call = wext_netdev_notifier_call,
379 static int __net_init wext_pernet_init(struct net *net)
381 skb_queue_head_init(&net->wext_nlevents);
385 static void __net_exit wext_pernet_exit(struct net *net)
387 skb_queue_purge(&net->wext_nlevents);
390 static struct pernet_operations wext_pernet_ops = {
391 .init = wext_pernet_init,
392 .exit = wext_pernet_exit,
395 static int __init wireless_nlevent_init(void)
397 int err = register_pernet_subsys(&wext_pernet_ops);
402 err = register_netdevice_notifier(&wext_netdev_notifier);
404 unregister_pernet_subsys(&wext_pernet_ops);
408 subsys_initcall(wireless_nlevent_init);
410 /* Process events generated by the wireless layer or the driver. */
411 static void wireless_nlevent_process(struct work_struct *work)
414 wireless_nlevent_flush();
418 static DECLARE_WORK(wireless_nlevent_work, wireless_nlevent_process);
420 static struct nlmsghdr *rtnetlink_ifinfo_prep(struct net_device *dev,
424 struct nlmsghdr *nlh;
426 nlh = nlmsg_put(skb, 0, 0, RTM_NEWLINK, sizeof(*r), 0);
431 r->ifi_family = AF_UNSPEC;
433 r->ifi_type = dev->type;
434 r->ifi_index = dev->ifindex;
435 r->ifi_flags = dev_get_flags(dev);
436 r->ifi_change = 0; /* Wireless changes don't affect those flags */
438 if (nla_put_string(skb, IFLA_IFNAME, dev->name))
439 goto nla_put_failure;
443 nlmsg_cancel(skb, nlh);
449 * Main event dispatcher. Called from other parts and drivers.
450 * Send the event on the appropriate channels.
451 * May be called from interrupt context.
453 void wireless_send_event(struct net_device * dev,
455 union iwreq_data * wrqu,
458 const struct iw_ioctl_description * descr = NULL;
460 struct iw_event *event; /* Mallocated whole event */
461 int event_len; /* Its size */
462 int hdr_len; /* Size of the event header */
463 int wrqu_off = 0; /* Offset in wrqu */
464 /* Don't "optimise" the following variable, it will crash */
465 unsigned int cmd_index; /* *MUST* be unsigned */
467 struct nlmsghdr *nlh;
470 struct __compat_iw_event *compat_event;
471 struct compat_iw_point compat_wrqu;
472 struct sk_buff *compskb;
476 * Nothing in the kernel sends scan events with data, be safe.
477 * This is necessary because we cannot fix up scan event data
478 * for compat, due to being contained in 'extra', but normally
479 * applications are required to retrieve the scan data anyway
480 * and no data is included in the event, this codifies that
483 if (WARN_ON(cmd == SIOCGIWSCAN && extra))
486 /* Get the description of the Event */
487 if (cmd <= SIOCIWLAST) {
488 cmd_index = IW_IOCTL_IDX(cmd);
489 if (cmd_index < standard_ioctl_num)
490 descr = &(standard_ioctl[cmd_index]);
492 cmd_index = IW_EVENT_IDX(cmd);
493 if (cmd_index < standard_event_num)
494 descr = &(standard_event[cmd_index]);
496 /* Don't accept unknown events */
498 /* Note : we don't return an error to the driver, because
499 * the driver would not know what to do about it. It can't
500 * return an error to the user, because the event is not
501 * initiated by a user request.
502 * The best the driver could do is to log an error message.
503 * We will do it ourselves instead...
505 netdev_err(dev, "(WE) : Invalid/Unknown Wireless Event (0x%04X)\n",
510 /* Check extra parameters and set extra_len */
511 if (descr->header_type == IW_HEADER_TYPE_POINT) {
512 /* Check if number of token fits within bounds */
513 if (wrqu->data.length > descr->max_tokens) {
514 netdev_err(dev, "(WE) : Wireless Event (cmd=0x%04X) too big (%d)\n",
515 cmd, wrqu->data.length);
518 if (wrqu->data.length < descr->min_tokens) {
519 netdev_err(dev, "(WE) : Wireless Event (cmd=0x%04X) too small (%d)\n",
520 cmd, wrqu->data.length);
523 /* Calculate extra_len - extra is NULL for restricted events */
525 extra_len = wrqu->data.length * descr->token_size;
526 /* Always at an offset in wrqu */
527 wrqu_off = IW_EV_POINT_OFF;
530 /* Total length of the event */
531 hdr_len = event_type_size[descr->header_type];
532 event_len = hdr_len + extra_len;
535 * The problem for 64/32 bit.
537 * On 64-bit, a regular event is laid out as follows:
538 * | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 |
539 * | event.len | event.cmd | p a d d i n g |
540 * | wrqu data ... (with the correct size) |
542 * This padding exists because we manipulate event->u,
543 * and 'event' is not packed.
545 * An iw_point event is laid out like this instead:
546 * | 0 | 1 | 2 | 3 | 4 | 5 | 6 | 7 |
547 * | event.len | event.cmd | p a d d i n g |
548 * | iwpnt.len | iwpnt.flg | p a d d i n g |
551 * The second padding exists because struct iw_point is extended,
552 * but this depends on the platform...
554 * On 32-bit, all the padding shouldn't be there.
557 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
561 /* Send via the RtNetlink event channel */
562 nlh = rtnetlink_ifinfo_prep(dev, skb);
568 /* Add the wireless events in the netlink packet */
569 nla = nla_reserve(skb, IFLA_WIRELESS, event_len);
574 event = nla_data(nla);
576 /* Fill event - first clear to avoid data leaking */
577 memset(event, 0, hdr_len);
578 event->len = event_len;
580 memcpy(&event->u, ((char *) wrqu) + wrqu_off, hdr_len - IW_EV_LCP_LEN);
582 memcpy(((char *) event) + hdr_len, extra, extra_len);
586 hdr_len = compat_event_type_size[descr->header_type];
587 event_len = hdr_len + extra_len;
589 compskb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
595 /* Send via the RtNetlink event channel */
596 nlh = rtnetlink_ifinfo_prep(dev, compskb);
603 /* Add the wireless events in the netlink packet */
604 nla = nla_reserve(compskb, IFLA_WIRELESS, event_len);
610 compat_event = nla_data(nla);
612 compat_event->len = event_len;
613 compat_event->cmd = cmd;
614 if (descr->header_type == IW_HEADER_TYPE_POINT) {
615 compat_wrqu.length = wrqu->data.length;
616 compat_wrqu.flags = wrqu->data.flags;
617 memcpy(&compat_event->pointer,
618 ((char *) &compat_wrqu) + IW_EV_COMPAT_POINT_OFF,
619 hdr_len - IW_EV_COMPAT_LCP_LEN);
621 memcpy(((char *) compat_event) + hdr_len,
624 /* extra_len must be zero, so no if (extra) needed */
625 memcpy(&compat_event->pointer, wrqu,
626 hdr_len - IW_EV_COMPAT_LCP_LEN);
629 nlmsg_end(compskb, nlh);
631 skb_shinfo(skb)->frag_list = compskb;
633 skb_queue_tail(&dev_net(dev)->wext_nlevents, skb);
634 schedule_work(&wireless_nlevent_work);
636 EXPORT_SYMBOL(wireless_send_event);
642 struct iw_statistics *get_wireless_stats(struct net_device *dev)
644 #ifdef CONFIG_WIRELESS_EXT
645 if ((dev->wireless_handlers != NULL) &&
646 (dev->wireless_handlers->get_wireless_stats != NULL))
647 return dev->wireless_handlers->get_wireless_stats(dev);
650 #ifdef CONFIG_CFG80211_WEXT
651 if (dev->ieee80211_ptr &&
652 dev->ieee80211_ptr->wiphy &&
653 dev->ieee80211_ptr->wiphy->wext &&
654 dev->ieee80211_ptr->wiphy->wext->get_wireless_stats)
655 return dev->ieee80211_ptr->wiphy->wext->get_wireless_stats(dev);
662 static int iw_handler_get_iwstats(struct net_device * dev,
663 struct iw_request_info * info,
664 union iwreq_data * wrqu,
667 /* Get stats from the driver */
668 struct iw_statistics *stats;
670 stats = get_wireless_stats(dev);
672 /* Copy statistics to extra */
673 memcpy(extra, stats, sizeof(struct iw_statistics));
674 wrqu->data.length = sizeof(struct iw_statistics);
676 /* Check if we need to clear the updated flag */
677 if (wrqu->data.flags != 0)
678 stats->qual.updated &= ~IW_QUAL_ALL_UPDATED;
684 static iw_handler get_handler(struct net_device *dev, unsigned int cmd)
686 /* Don't "optimise" the following variable, it will crash */
687 unsigned int index; /* *MUST* be unsigned */
688 const struct iw_handler_def *handlers = NULL;
690 #ifdef CONFIG_CFG80211_WEXT
691 if (dev->ieee80211_ptr && dev->ieee80211_ptr->wiphy)
692 handlers = dev->ieee80211_ptr->wiphy->wext;
694 #ifdef CONFIG_WIRELESS_EXT
695 if (dev->wireless_handlers)
696 handlers = dev->wireless_handlers;
702 /* Try as a standard command */
703 index = IW_IOCTL_IDX(cmd);
704 if (index < handlers->num_standard)
705 return handlers->standard[index];
707 #ifdef CONFIG_WEXT_PRIV
708 /* Try as a private command */
709 index = cmd - SIOCIWFIRSTPRIV;
710 if (index < handlers->num_private)
711 return handlers->private[index];
718 static int ioctl_standard_iw_point(struct iw_point *iwp, unsigned int cmd,
719 const struct iw_ioctl_description *descr,
720 iw_handler handler, struct net_device *dev,
721 struct iw_request_info *info)
723 int err, extra_size, user_length = 0, essid_compat = 0;
726 /* Calculate space needed by arguments. Always allocate
729 extra_size = descr->max_tokens * descr->token_size;
731 /* Check need for ESSID compatibility for WE < 21 */
737 if (iwp->length == descr->max_tokens + 1)
739 else if (IW_IS_SET(cmd) && (iwp->length != 0)) {
740 char essid[IW_ESSID_MAX_SIZE + 1];
742 len = iwp->length * descr->token_size;
744 if (len > IW_ESSID_MAX_SIZE)
747 err = copy_from_user(essid, iwp->pointer, len);
751 if (essid[iwp->length - 1] == '\0')
759 iwp->length -= essid_compat;
761 /* Check what user space is giving us */
762 if (IW_IS_SET(cmd)) {
763 /* Check NULL pointer */
764 if (!iwp->pointer && iwp->length != 0)
766 /* Check if number of token fits within bounds */
767 if (iwp->length > descr->max_tokens)
769 if (iwp->length < descr->min_tokens)
772 /* Check NULL pointer */
775 /* Save user space buffer size for checking */
776 user_length = iwp->length;
778 /* Don't check if user_length > max to allow forward
779 * compatibility. The test user_length < min is
780 * implied by the test at the end.
783 /* Support for very large requests */
784 if ((descr->flags & IW_DESCR_FLAG_NOMAX) &&
785 (user_length > descr->max_tokens)) {
786 /* Allow userspace to GET more than max so
787 * we can support any size GET requests.
788 * There is still a limit : -ENOMEM.
790 extra_size = user_length * descr->token_size;
792 /* Note : user_length is originally a __u16,
793 * and token_size is controlled by us,
794 * so extra_size won't get negative and
800 /* kzalloc() ensures NULL-termination for essid_compat. */
801 extra = kzalloc(extra_size, GFP_KERNEL);
805 /* If it is a SET, get all the extra data in here */
806 if (IW_IS_SET(cmd) && (iwp->length != 0)) {
807 if (copy_from_user(extra, iwp->pointer,
809 descr->token_size)) {
814 if (cmd == SIOCSIWENCODEEXT) {
815 struct iw_encode_ext *ee = (void *) extra;
817 if (iwp->length < sizeof(*ee) + ee->key_len) {
824 if (IW_IS_GET(cmd) && !(descr->flags & IW_DESCR_FLAG_NOMAX)) {
826 * If this is a GET, but not NOMAX, it means that the extra
827 * data is not bounded by userspace, but by max_tokens. Thus
828 * set the length to max_tokens. This matches the extra data
830 * The driver should fill it with the number of tokens it
831 * provided, and it may check iwp->length rather than having
832 * knowledge of max_tokens. If the driver doesn't change the
833 * iwp->length, this ioctl just copies back max_token tokens
834 * filled with zeroes. Hopefully the driver isn't claiming
835 * them to be valid data.
837 iwp->length = descr->max_tokens;
840 err = handler(dev, info, (union iwreq_data *) iwp, extra);
842 iwp->length += essid_compat;
844 /* If we have something to return to the user */
845 if (!err && IW_IS_GET(cmd)) {
846 /* Check if there is enough buffer up there */
847 if (user_length < iwp->length) {
852 if (copy_to_user(iwp->pointer, extra,
854 descr->token_size)) {
860 /* Generate an event to notify listeners of the change */
861 if ((descr->flags & IW_DESCR_FLAG_EVENT) &&
862 ((err == 0) || (err == -EIWCOMMIT))) {
863 union iwreq_data *data = (union iwreq_data *) iwp;
865 if (descr->flags & IW_DESCR_FLAG_RESTRICT)
866 /* If the event is restricted, don't
867 * export the payload.
869 wireless_send_event(dev, cmd, data, NULL);
871 wireless_send_event(dev, cmd, data, extra);
880 * Call the commit handler in the driver
881 * (if exist and if conditions are right)
883 * Note : our current commit strategy is currently pretty dumb,
884 * but we will be able to improve on that...
885 * The goal is to try to agreagate as many changes as possible
886 * before doing the commit. Drivers that will define a commit handler
887 * are usually those that need a reset after changing parameters, so
888 * we want to minimise the number of reset.
889 * A cool idea is to use a timer : at each "set" command, we re-set the
890 * timer, when the timer eventually fires, we call the driver.
891 * Hopefully, more on that later.
893 * Also, I'm waiting to see how many people will complain about the
894 * netif_running(dev) test. I'm open on that one...
895 * Hopefully, the driver will remember to do a commit in "open()" ;-)
897 int call_commit_handler(struct net_device *dev)
899 #ifdef CONFIG_WIRELESS_EXT
900 if ((netif_running(dev)) &&
901 (dev->wireless_handlers->standard[0] != NULL))
902 /* Call the commit handler on the driver */
903 return dev->wireless_handlers->standard[0](dev, NULL,
906 return 0; /* Command completed successfully */
908 /* cfg80211 has no commit */
914 * Main IOCTl dispatcher.
915 * Check the type of IOCTL and call the appropriate wrapper...
917 static int wireless_process_ioctl(struct net *net, struct ifreq *ifr,
919 struct iw_request_info *info,
920 wext_ioctl_func standard,
921 wext_ioctl_func private)
923 struct iwreq *iwr = (struct iwreq *) ifr;
924 struct net_device *dev;
927 /* Permissions are already checked in dev_ioctl() before calling us.
928 * The copy_to/from_user() of ifr is also dealt with in there */
930 /* Make sure the device exist */
931 if ((dev = __dev_get_by_name(net, ifr->ifr_name)) == NULL)
934 /* A bunch of special cases, then the generic case...
935 * Note that 'cmd' is already filtered in dev_ioctl() with
936 * (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST) */
937 if (cmd == SIOCGIWSTATS)
938 return standard(dev, iwr, cmd, info,
939 &iw_handler_get_iwstats);
941 #ifdef CONFIG_WEXT_PRIV
942 if (cmd == SIOCGIWPRIV && dev->wireless_handlers)
943 return standard(dev, iwr, cmd, info,
944 iw_handler_get_private);
948 if (!netif_device_present(dev))
951 /* New driver API : try to find the handler */
952 handler = get_handler(dev, cmd);
954 /* Standard and private are not the same */
955 if (cmd < SIOCIWFIRSTPRIV)
956 return standard(dev, iwr, cmd, info, handler);
958 return private(dev, iwr, cmd, info, handler);
960 /* Old driver API : call driver ioctl handler */
961 if (dev->netdev_ops->ndo_do_ioctl)
962 return dev->netdev_ops->ndo_do_ioctl(dev, ifr, cmd);
966 /* If command is `set a parameter', or `get the encoding parameters',
967 * check if the user has the right to do it.
969 static int wext_permission_check(unsigned int cmd)
971 if ((IW_IS_SET(cmd) || cmd == SIOCGIWENCODE ||
972 cmd == SIOCGIWENCODEEXT) &&
973 !capable(CAP_NET_ADMIN))
979 /* entry point from dev ioctl */
980 static int wext_ioctl_dispatch(struct net *net, struct ifreq *ifr,
981 unsigned int cmd, struct iw_request_info *info,
982 wext_ioctl_func standard,
983 wext_ioctl_func private)
985 int ret = wext_permission_check(cmd);
990 dev_load(net, ifr->ifr_name);
992 ret = wireless_process_ioctl(net, ifr, cmd, info, standard, private);
999 * Wrapper to call a standard Wireless Extension handler.
1000 * We do various checks and also take care of moving data between
1001 * user space and kernel space.
1003 static int ioctl_standard_call(struct net_device * dev,
1006 struct iw_request_info *info,
1009 const struct iw_ioctl_description * descr;
1012 /* Get the description of the IOCTL */
1013 if (IW_IOCTL_IDX(cmd) >= standard_ioctl_num)
1015 descr = &(standard_ioctl[IW_IOCTL_IDX(cmd)]);
1017 /* Check if we have a pointer to user space data or not */
1018 if (descr->header_type != IW_HEADER_TYPE_POINT) {
1020 /* No extra arguments. Trivial to handle */
1021 ret = handler(dev, info, &(iwr->u), NULL);
1023 /* Generate an event to notify listeners of the change */
1024 if ((descr->flags & IW_DESCR_FLAG_EVENT) &&
1025 ((ret == 0) || (ret == -EIWCOMMIT)))
1026 wireless_send_event(dev, cmd, &(iwr->u), NULL);
1028 ret = ioctl_standard_iw_point(&iwr->u.data, cmd, descr,
1029 handler, dev, info);
1032 /* Call commit handler if needed and defined */
1033 if (ret == -EIWCOMMIT)
1034 ret = call_commit_handler(dev);
1036 /* Here, we will generate the appropriate event if needed */
1042 int wext_handle_ioctl(struct net *net, struct ifreq *ifr, unsigned int cmd,
1045 struct iw_request_info info = { .cmd = cmd, .flags = 0 };
1048 ret = wext_ioctl_dispatch(net, ifr, cmd, &info,
1049 ioctl_standard_call,
1050 ioctl_private_call);
1053 copy_to_user(arg, ifr, sizeof(struct iwreq)))
1059 #ifdef CONFIG_COMPAT
1060 static int compat_standard_call(struct net_device *dev,
1063 struct iw_request_info *info,
1066 const struct iw_ioctl_description *descr;
1067 struct compat_iw_point *iwp_compat;
1068 struct iw_point iwp;
1071 descr = standard_ioctl + IW_IOCTL_IDX(cmd);
1073 if (descr->header_type != IW_HEADER_TYPE_POINT)
1074 return ioctl_standard_call(dev, iwr, cmd, info, handler);
1076 iwp_compat = (struct compat_iw_point *) &iwr->u.data;
1077 iwp.pointer = compat_ptr(iwp_compat->pointer);
1078 iwp.length = iwp_compat->length;
1079 iwp.flags = iwp_compat->flags;
1081 err = ioctl_standard_iw_point(&iwp, cmd, descr, handler, dev, info);
1083 iwp_compat->pointer = ptr_to_compat(iwp.pointer);
1084 iwp_compat->length = iwp.length;
1085 iwp_compat->flags = iwp.flags;
1090 int compat_wext_handle_ioctl(struct net *net, unsigned int cmd,
1093 void __user *argp = (void __user *)arg;
1094 struct iw_request_info info;
1099 if (copy_from_user(&iwr, argp, sizeof(struct iwreq)))
1102 iwr.ifr_name[IFNAMSIZ-1] = 0;
1103 colon = strchr(iwr.ifr_name, ':');
1108 info.flags = IW_REQUEST_FLAG_COMPAT;
1110 ret = wext_ioctl_dispatch(net, (struct ifreq *) &iwr, cmd, &info,
1111 compat_standard_call,
1112 compat_private_call);
1116 copy_to_user(argp, &iwr, sizeof(struct iwreq)))