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)
350 down_read(&net_rwsem);
352 while ((skb = skb_dequeue(&net->wext_nlevents)))
353 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)
413 wireless_nlevent_flush();
416 static DECLARE_WORK(wireless_nlevent_work, wireless_nlevent_process);
418 static struct nlmsghdr *rtnetlink_ifinfo_prep(struct net_device *dev,
422 struct nlmsghdr *nlh;
424 nlh = nlmsg_put(skb, 0, 0, RTM_NEWLINK, sizeof(*r), 0);
429 r->ifi_family = AF_UNSPEC;
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 */
436 if (nla_put_string(skb, IFLA_IFNAME, dev->name))
437 goto nla_put_failure;
441 nlmsg_cancel(skb, nlh);
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.
451 void wireless_send_event(struct net_device * dev,
453 union iwreq_data * wrqu,
456 const struct iw_ioctl_description * descr = NULL;
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 */
465 struct nlmsghdr *nlh;
468 struct __compat_iw_event *compat_event;
469 struct compat_iw_point compat_wrqu;
470 struct sk_buff *compskb;
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
481 if (WARN_ON(cmd == SIOCGIWSCAN && extra))
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]);
490 cmd_index = IW_EVENT_IDX(cmd);
491 if (cmd_index < standard_event_num)
492 descr = &(standard_event[cmd_index]);
494 /* Don't accept unknown events */
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...
503 netdev_err(dev, "(WE) : Invalid/Unknown Wireless Event (0x%04X)\n",
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);
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);
521 /* Calculate extra_len - extra is NULL for restricted events */
523 extra_len = wrqu->data.length * descr->token_size;
524 /* Always at an offset in wrqu */
525 wrqu_off = IW_EV_POINT_OFF;
528 /* Total length of the event */
529 hdr_len = event_type_size[descr->header_type];
530 event_len = hdr_len + extra_len;
533 * The problem for 64/32 bit.
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) |
540 * This padding exists because we manipulate event->u,
541 * and 'event' is not packed.
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 |
549 * The second padding exists because struct iw_point is extended,
550 * but this depends on the platform...
552 * On 32-bit, all the padding shouldn't be there.
555 skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
559 /* Send via the RtNetlink event channel */
560 nlh = rtnetlink_ifinfo_prep(dev, skb);
566 /* Add the wireless events in the netlink packet */
567 nla = nla_reserve(skb, IFLA_WIRELESS, event_len);
572 event = nla_data(nla);
574 /* Fill event - first clear to avoid data leaking */
575 memset(event, 0, hdr_len);
576 event->len = event_len;
578 memcpy(&event->u, ((char *) wrqu) + wrqu_off, hdr_len - IW_EV_LCP_LEN);
580 memcpy(((char *) event) + hdr_len, extra, extra_len);
584 hdr_len = compat_event_type_size[descr->header_type];
585 event_len = hdr_len + extra_len;
587 compskb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
593 /* Send via the RtNetlink event channel */
594 nlh = rtnetlink_ifinfo_prep(dev, compskb);
601 /* Add the wireless events in the netlink packet */
602 nla = nla_reserve(compskb, IFLA_WIRELESS, event_len);
608 compat_event = nla_data(nla);
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);
619 memcpy(((char *) compat_event) + hdr_len,
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);
627 nlmsg_end(compskb, nlh);
629 skb_shinfo(skb)->frag_list = compskb;
631 skb_queue_tail(&dev_net(dev)->wext_nlevents, skb);
632 schedule_work(&wireless_nlevent_work);
634 EXPORT_SYMBOL(wireless_send_event);
640 struct iw_statistics *get_wireless_stats(struct net_device *dev)
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);
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);
660 static int iw_handler_get_iwstats(struct net_device * dev,
661 struct iw_request_info * info,
662 union iwreq_data * wrqu,
665 /* Get stats from the driver */
666 struct iw_statistics *stats;
668 stats = get_wireless_stats(dev);
670 /* Copy statistics to extra */
671 memcpy(extra, stats, sizeof(struct iw_statistics));
672 wrqu->data.length = sizeof(struct iw_statistics);
674 /* Check if we need to clear the updated flag */
675 if (wrqu->data.flags != 0)
676 stats->qual.updated &= ~IW_QUAL_ALL_UPDATED;
682 static iw_handler get_handler(struct net_device *dev, unsigned int cmd)
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;
688 #ifdef CONFIG_CFG80211_WEXT
689 if (dev->ieee80211_ptr && dev->ieee80211_ptr->wiphy)
690 handlers = dev->ieee80211_ptr->wiphy->wext;
692 #ifdef CONFIG_WIRELESS_EXT
693 if (dev->wireless_handlers)
694 handlers = dev->wireless_handlers;
700 /* Try as a standard command */
701 index = IW_IOCTL_IDX(cmd);
702 if (index < handlers->num_standard)
703 return handlers->standard[index];
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];
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)
721 int err, extra_size, user_length = 0, essid_compat = 0;
724 /* Calculate space needed by arguments. Always allocate
727 extra_size = descr->max_tokens * descr->token_size;
729 /* Check need for ESSID compatibility for WE < 21 */
735 if (iwp->length == descr->max_tokens + 1)
737 else if (IW_IS_SET(cmd) && (iwp->length != 0)) {
738 char essid[IW_ESSID_MAX_SIZE + 1];
740 len = iwp->length * descr->token_size;
742 if (len > IW_ESSID_MAX_SIZE)
745 err = copy_from_user(essid, iwp->pointer, len);
749 if (essid[iwp->length - 1] == '\0')
757 iwp->length -= essid_compat;
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)
764 /* Check if number of token fits within bounds */
765 if (iwp->length > descr->max_tokens)
767 if (iwp->length < descr->min_tokens)
770 /* Check NULL pointer */
773 /* Save user space buffer size for checking */
774 user_length = iwp->length;
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.
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.
788 extra_size = user_length * descr->token_size;
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
798 /* kzalloc() ensures NULL-termination for essid_compat. */
799 extra = kzalloc(extra_size, GFP_KERNEL);
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,
807 descr->token_size)) {
812 if (cmd == SIOCSIWENCODEEXT) {
813 struct iw_encode_ext *ee = (void *) extra;
815 if (iwp->length < sizeof(*ee) + ee->key_len) {
822 if (IW_IS_GET(cmd) && !(descr->flags & IW_DESCR_FLAG_NOMAX)) {
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
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.
835 iwp->length = descr->max_tokens;
838 err = handler(dev, info, (union iwreq_data *) iwp, extra);
840 iwp->length += essid_compat;
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) {
850 if (copy_to_user(iwp->pointer, extra,
852 descr->token_size)) {
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;
863 if (descr->flags & IW_DESCR_FLAG_RESTRICT)
864 /* If the event is restricted, don't
865 * export the payload.
867 wireless_send_event(dev, cmd, data, NULL);
869 wireless_send_event(dev, cmd, data, extra);
878 * Call the commit handler in the driver
879 * (if exist and if conditions are right)
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.
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()" ;-)
895 int call_commit_handler(struct net_device *dev)
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,
904 return 0; /* Command completed successfully */
906 /* cfg80211 has no commit */
912 * Main IOCTl dispatcher.
913 * Check the type of IOCTL and call the appropriate wrapper...
915 static int wireless_process_ioctl(struct net *net, struct iwreq *iwr,
917 struct iw_request_info *info,
918 wext_ioctl_func standard,
919 wext_ioctl_func private)
921 struct net_device *dev;
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 */
927 /* Make sure the device exist */
928 if ((dev = __dev_get_by_name(net, iwr->ifr_name)) == NULL)
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);
938 #ifdef CONFIG_WEXT_PRIV
939 if (cmd == SIOCGIWPRIV && dev->wireless_handlers)
940 return standard(dev, iwr, cmd, info,
941 iw_handler_get_private);
945 if (!netif_device_present(dev))
948 /* New driver API : try to find the handler */
949 handler = get_handler(dev, cmd);
951 /* Standard and private are not the same */
952 if (cmd < SIOCIWFIRSTPRIV)
953 return standard(dev, iwr, cmd, info, handler);
955 return private(dev, iwr, cmd, info, handler);
960 /* If command is `set a parameter', or `get the encoding parameters',
961 * check if the user has the right to do it.
963 static int wext_permission_check(unsigned int cmd)
965 if ((IW_IS_SET(cmd) || cmd == SIOCGIWENCODE ||
966 cmd == SIOCGIWENCODEEXT) &&
967 !capable(CAP_NET_ADMIN))
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)
979 int ret = wext_permission_check(cmd);
984 dev_load(net, iwr->ifr_name);
986 ret = wireless_process_ioctl(net, iwr, cmd, info, standard, private);
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.
997 static int ioctl_standard_call(struct net_device * dev,
1000 struct iw_request_info *info,
1003 const struct iw_ioctl_description * descr;
1006 /* Get the description of the IOCTL */
1007 if (IW_IOCTL_IDX(cmd) >= standard_ioctl_num)
1009 descr = &(standard_ioctl[IW_IOCTL_IDX(cmd)]);
1011 /* Check if we have a pointer to user space data or not */
1012 if (descr->header_type != IW_HEADER_TYPE_POINT) {
1014 /* No extra arguments. Trivial to handle */
1015 ret = handler(dev, info, &(iwr->u), NULL);
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);
1022 ret = ioctl_standard_iw_point(&iwr->u.data, cmd, descr,
1023 handler, dev, info);
1026 /* Call commit handler if needed and defined */
1027 if (ret == -EIWCOMMIT)
1028 ret = call_commit_handler(dev);
1030 /* Here, we will generate the appropriate event if needed */
1036 int wext_handle_ioctl(struct net *net, unsigned int cmd, void __user *arg)
1038 struct iw_request_info info = { .cmd = cmd, .flags = 0 };
1042 if (copy_from_user(&iwr, arg, sizeof(iwr)))
1045 iwr.ifr_name[sizeof(iwr.ifr_name) - 1] = 0;
1047 ret = wext_ioctl_dispatch(net, &iwr, cmd, &info,
1048 ioctl_standard_call,
1049 ioctl_private_call);
1052 copy_to_user(arg, &iwr, sizeof(struct iwreq)))
1058 #ifdef CONFIG_COMPAT
1059 static int compat_standard_call(struct net_device *dev,
1062 struct iw_request_info *info,
1065 const struct iw_ioctl_description *descr;
1066 struct compat_iw_point *iwp_compat;
1067 struct iw_point iwp;
1070 descr = standard_ioctl + IW_IOCTL_IDX(cmd);
1072 if (descr->header_type != IW_HEADER_TYPE_POINT)
1073 return ioctl_standard_call(dev, iwr, cmd, info, handler);
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;
1080 err = ioctl_standard_iw_point(&iwp, cmd, descr, handler, dev, info);
1082 iwp_compat->pointer = ptr_to_compat(iwp.pointer);
1083 iwp_compat->length = iwp.length;
1084 iwp_compat->flags = iwp.flags;
1089 int compat_wext_handle_ioctl(struct net *net, unsigned int cmd,
1092 void __user *argp = (void __user *)arg;
1093 struct iw_request_info info;
1098 if (copy_from_user(&iwr, argp, sizeof(struct iwreq)))
1101 iwr.ifr_name[IFNAMSIZ-1] = 0;
1102 colon = strchr(iwr.ifr_name, ':');
1107 info.flags = IW_REQUEST_FLAG_COMPAT;
1109 ret = wext_ioctl_dispatch(net, &iwr, cmd, &info,
1110 compat_standard_call,
1111 compat_private_call);
1115 copy_to_user(argp, &iwr, sizeof(struct iwreq)))
1122 char *iwe_stream_add_event(struct iw_request_info *info, char *stream,
1123 char *ends, struct iw_event *iwe, int event_len)
1125 int lcp_len = iwe_stream_lcp_len(info);
1127 event_len = iwe_stream_event_len_adjust(info, event_len);
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;
1141 EXPORT_SYMBOL(iwe_stream_add_event);
1143 char *iwe_stream_add_point(struct iw_request_info *info, char *stream,
1144 char *ends, struct iw_event *iwe, char *extra)
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);
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;
1164 EXPORT_SYMBOL(iwe_stream_add_point);
1166 char *iwe_stream_add_value(struct iw_request_info *info, char *event,
1167 char *value, char *ends, struct iw_event *iwe,
1170 int lcp_len = iwe_stream_lcp_len(info);
1172 /* Don't duplicate LCP */
1173 event_len -= IW_EV_LCP_LEN;
1175 /* Check if it's possible */
1176 if (likely((value + event_len) < ends)) {
1178 memcpy(value, &iwe->u, event_len);
1181 iwe->len = value - event;
1182 memcpy(event, (char *) iwe, lcp_len);
1187 EXPORT_SYMBOL(iwe_stream_add_value);