/net/wireless/wext-core.c

   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
  23typedef 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 */
  32static 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};
 259static 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 */
 265static 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};
 309static const unsigned int standard_event_num = ARRAY_SIZE(standard_event);
 310
 311/* Size (in bytes) of various events */
 312static 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
 327static 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
 345void 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}
 358EXPORT_SYMBOL_GPL(wireless_nlevent_flush);
 359
 360static 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
 375static struct notifier_block wext_netdev_notifier = {
 376	.notifier_call = wext_netdev_notifier_call,
 377};
 378
 379static int __net_init wext_pernet_init(struct net *net)
 380{
 381	skb_queue_head_init(&net->wext_nlevents);
 382	return 0;
 383}
 384
 385static void __net_exit wext_pernet_exit(struct net *net)
 386{
 387	skb_queue_purge(&net->wext_nlevents);
 388}
 389
 390static struct pernet_operations wext_pernet_ops = {
 391	.init = wext_pernet_init,
 392	.exit = wext_pernet_exit,
 393};
 394
 395static 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
 408subsys_initcall(wireless_nlevent_init);
 409
 410/* Process events generated by the wireless layer or the driver. */
 411static void wireless_nlevent_process(struct work_struct *work)
 412{
 413	wireless_nlevent_flush();
 414}
 415
 416static DECLARE_WORK(wireless_nlevent_work, wireless_nlevent_process);
 417
 418static 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 */
 451void 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}
 634EXPORT_SYMBOL(wireless_send_event);
 635
 636
 637
 638/* IW handlers */
 639
 640struct 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/* noinline to avoid a bogus warning with -O3 */
 661static noinline int iw_handler_get_iwstats(struct net_device *	dev,
 662				  struct iw_request_info *	info,
 663				  union iwreq_data *		wrqu,
 664				  char *			extra)
 665{
 666	/* Get stats from the driver */
 667	struct iw_statistics *stats;
 668
 669	stats = get_wireless_stats(dev);
 670	if (stats) {
 671		/* Copy statistics to extra */
 672		memcpy(extra, stats, sizeof(struct iw_statistics));
 673		wrqu->data.length = sizeof(struct iw_statistics);
 674
 675		/* Check if we need to clear the updated flag */
 676		if (wrqu->data.flags != 0)
 677			stats->qual.updated &= ~IW_QUAL_ALL_UPDATED;
 678		return 0;
 679	} else
 680		return -EOPNOTSUPP;
 681}
 682
 683static iw_handler get_handler(struct net_device *dev, unsigned int cmd)
 684{
 685	/* Don't "optimise" the following variable, it will crash */
 686	unsigned int	index;		/* *MUST* be unsigned */
 687	const struct iw_handler_def *handlers = NULL;
 688
 689#ifdef CONFIG_CFG80211_WEXT
 690	if (dev->ieee80211_ptr && dev->ieee80211_ptr->wiphy)
 691		handlers = dev->ieee80211_ptr->wiphy->wext;
 692#endif
 693#ifdef CONFIG_WIRELESS_EXT
 694	if (dev->wireless_handlers)
 695		handlers = dev->wireless_handlers;
 696#endif
 697
 698	if (!handlers)
 699		return NULL;
 700
 701	/* Try as a standard command */
 702	index = IW_IOCTL_IDX(cmd);
 703	if (index < handlers->num_standard)
 704		return handlers->standard[index];
 705
 706#ifdef CONFIG_WEXT_PRIV
 707	/* Try as a private command */
 708	index = cmd - SIOCIWFIRSTPRIV;
 709	if (index < handlers->num_private)
 710		return handlers->private[index];
 711#endif
 712
 713	/* Not found */
 714	return NULL;
 715}
 716
 717static int ioctl_standard_iw_point(struct iw_point *iwp, unsigned int cmd,
 718				   const struct iw_ioctl_description *descr,
 719				   iw_handler handler, struct net_device *dev,
 720				   struct iw_request_info *info)
 721{
 722	int err, extra_size, user_length = 0, essid_compat = 0;
 723	char *extra;
 724
 725	/* Calculate space needed by arguments. Always allocate
 726	 * for max space.
 727	 */
 728	extra_size = descr->max_tokens * descr->token_size;
 729
 730	/* Check need for ESSID compatibility for WE < 21 */
 731	switch (cmd) {
 732	case SIOCSIWESSID:
 733	case SIOCGIWESSID:
 734	case SIOCSIWNICKN:
 735	case SIOCGIWNICKN:
 736		if (iwp->length == descr->max_tokens + 1)
 737			essid_compat = 1;
 738		else if (IW_IS_SET(cmd) && (iwp->length != 0)) {
 739			char essid[IW_ESSID_MAX_SIZE + 1];
 740			unsigned int len;
 741			len = iwp->length * descr->token_size;
 742
 743			if (len > IW_ESSID_MAX_SIZE)
 744				return -EFAULT;
 745
 746			err = copy_from_user(essid, iwp->pointer, len);
 747			if (err)
 748				return -EFAULT;
 749
 750			if (essid[iwp->length - 1] == '\0')
 751				essid_compat = 1;
 752		}
 753		break;
 754	default:
 755		break;
 756	}
 757
 758	iwp->length -= essid_compat;
 759
 760	/* Check what user space is giving us */
 761	if (IW_IS_SET(cmd)) {
 762		/* Check NULL pointer */
 763		if (!iwp->pointer && iwp->length != 0)
 764			return -EFAULT;
 765		/* Check if number of token fits within bounds */
 766		if (iwp->length > descr->max_tokens)
 767			return -E2BIG;
 768		if (iwp->length < descr->min_tokens)
 769			return -EINVAL;
 770	} else {
 771		/* Check NULL pointer */
 772		if (!iwp->pointer)
 773			return -EFAULT;
 774		/* Save user space buffer size for checking */
 775		user_length = iwp->length;
 776
 777		/* Don't check if user_length > max to allow forward
 778		 * compatibility. The test user_length < min is
 779		 * implied by the test at the end.
 780		 */
 781
 782		/* Support for very large requests */
 783		if ((descr->flags & IW_DESCR_FLAG_NOMAX) &&
 784		    (user_length > descr->max_tokens)) {
 785			/* Allow userspace to GET more than max so
 786			 * we can support any size GET requests.
 787			 * There is still a limit : -ENOMEM.
 788			 */
 789			extra_size = user_length * descr->token_size;
 790
 791			/* Note : user_length is originally a __u16,
 792			 * and token_size is controlled by us,
 793			 * so extra_size won't get negative and
 794			 * won't overflow...
 795			 */
 796		}
 797	}
 798
 799	/* kzalloc() ensures NULL-termination for essid_compat. */
 800	extra = kzalloc(extra_size, GFP_KERNEL);
 801	if (!extra)
 802		return -ENOMEM;
 803
 804	/* If it is a SET, get all the extra data in here */
 805	if (IW_IS_SET(cmd) && (iwp->length != 0)) {
 806		if (copy_from_user(extra, iwp->pointer,
 807				   iwp->length *
 808				   descr->token_size)) {
 809			err = -EFAULT;
 810			goto out;
 811		}
 812
 813		if (cmd == SIOCSIWENCODEEXT) {
 814			struct iw_encode_ext *ee = (void *) extra;
 815
 816			if (iwp->length < sizeof(*ee) + ee->key_len) {
 817				err = -EFAULT;
 818				goto out;
 819			}
 820		}
 821	}
 822
 823	if (IW_IS_GET(cmd) && !(descr->flags & IW_DESCR_FLAG_NOMAX)) {
 824		/*
 825		 * If this is a GET, but not NOMAX, it means that the extra
 826		 * data is not bounded by userspace, but by max_tokens. Thus
 827		 * set the length to max_tokens. This matches the extra data
 828		 * allocation.
 829		 * The driver should fill it with the number of tokens it
 830		 * provided, and it may check iwp->length rather than having
 831		 * knowledge of max_tokens. If the driver doesn't change the
 832		 * iwp->length, this ioctl just copies back max_token tokens
 833		 * filled with zeroes. Hopefully the driver isn't claiming
 834		 * them to be valid data.
 835		 */
 836		iwp->length = descr->max_tokens;
 837	}
 838
 839	err = handler(dev, info, (union iwreq_data *) iwp, extra);
 840
 841	iwp->length += essid_compat;
 842
 843	/* If we have something to return to the user */
 844	if (!err && IW_IS_GET(cmd)) {
 845		/* Check if there is enough buffer up there */
 846		if (user_length < iwp->length) {
 847			err = -E2BIG;
 848			goto out;
 849		}
 850
 851		if (copy_to_user(iwp->pointer, extra,
 852				 iwp->length *
 853				 descr->token_size)) {
 854			err = -EFAULT;
 855			goto out;
 856		}
 857	}
 858
 859	/* Generate an event to notify listeners of the change */
 860	if ((descr->flags & IW_DESCR_FLAG_EVENT) &&
 861	    ((err == 0) || (err == -EIWCOMMIT))) {
 862		union iwreq_data *data = (union iwreq_data *) iwp;
 863
 864		if (descr->flags & IW_DESCR_FLAG_RESTRICT)
 865			/* If the event is restricted, don't
 866			 * export the payload.
 867			 */
 868			wireless_send_event(dev, cmd, data, NULL);
 869		else
 870			wireless_send_event(dev, cmd, data, extra);
 871	}
 872
 873out:
 874	kfree(extra);
 875	return err;
 876}
 877
 878/*
 879 * Call the commit handler in the driver
 880 * (if exist and if conditions are right)
 881 *
 882 * Note : our current commit strategy is currently pretty dumb,
 883 * but we will be able to improve on that...
 884 * The goal is to try to agreagate as many changes as possible
 885 * before doing the commit. Drivers that will define a commit handler
 886 * are usually those that need a reset after changing parameters, so
 887 * we want to minimise the number of reset.
 888 * A cool idea is to use a timer : at each "set" command, we re-set the
 889 * timer, when the timer eventually fires, we call the driver.
 890 * Hopefully, more on that later.
 891 *
 892 * Also, I'm waiting to see how many people will complain about the
 893 * netif_running(dev) test. I'm open on that one...
 894 * Hopefully, the driver will remember to do a commit in "open()" ;-)
 895 */
 896int call_commit_handler(struct net_device *dev)
 897{
 898#ifdef CONFIG_WIRELESS_EXT
 899	if ((netif_running(dev)) &&
 900	   (dev->wireless_handlers->standard[0] != NULL))
 901		/* Call the commit handler on the driver */
 902		return dev->wireless_handlers->standard[0](dev, NULL,
 903							   NULL, NULL);
 904	else
 905		return 0;		/* Command completed successfully */
 906#else
 907	/* cfg80211 has no commit */
 908	return 0;
 909#endif
 910}
 911
 912/*
 913 * Main IOCTl dispatcher.
 914 * Check the type of IOCTL and call the appropriate wrapper...
 915 */
 916static int wireless_process_ioctl(struct net *net, struct iwreq *iwr,
 917				  unsigned int cmd,
 918				  struct iw_request_info *info,
 919				  wext_ioctl_func standard,
 920				  wext_ioctl_func private)
 921{
 922	struct net_device *dev;
 923	iw_handler	handler;
 924
 925	/* Permissions are already checked in dev_ioctl() before calling us.
 926	 * The copy_to/from_user() of ifr is also dealt with in there */
 927
 928	/* Make sure the device exist */
 929	if ((dev = __dev_get_by_name(net, iwr->ifr_name)) == NULL)
 930		return -ENODEV;
 931
 932	/* A bunch of special cases, then the generic case...
 933	 * Note that 'cmd' is already filtered in dev_ioctl() with
 934	 * (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST) */
 935	if (cmd == SIOCGIWSTATS)
 936		return standard(dev, iwr, cmd, info,
 937				&iw_handler_get_iwstats);
 938
 939#ifdef CONFIG_WEXT_PRIV
 940	if (cmd == SIOCGIWPRIV && dev->wireless_handlers)
 941		return standard(dev, iwr, cmd, info,
 942				iw_handler_get_private);
 943#endif
 944
 945	/* Basic check */
 946	if (!netif_device_present(dev))
 947		return -ENODEV;
 948
 949	/* New driver API : try to find the handler */
 950	handler = get_handler(dev, cmd);
 951	if (handler) {
 952		/* Standard and private are not the same */
 953		if (cmd < SIOCIWFIRSTPRIV)
 954			return standard(dev, iwr, cmd, info, handler);
 955		else if (private)
 956			return private(dev, iwr, cmd, info, handler);
 957	}
 958	return -EOPNOTSUPP;
 959}
 960
 961/* If command is `set a parameter', or `get the encoding parameters',
 962 * check if the user has the right to do it.
 963 */
 964static int wext_permission_check(unsigned int cmd)
 965{
 966	if ((IW_IS_SET(cmd) || cmd == SIOCGIWENCODE ||
 967	     cmd == SIOCGIWENCODEEXT) &&
 968	    !capable(CAP_NET_ADMIN))
 969		return -EPERM;
 970
 971	return 0;
 972}
 973
 974/* entry point from dev ioctl */
 975static int wext_ioctl_dispatch(struct net *net, struct iwreq *iwr,
 976			       unsigned int cmd, struct iw_request_info *info,
 977			       wext_ioctl_func standard,
 978			       wext_ioctl_func private)
 979{
 980	int ret = wext_permission_check(cmd);
 981
 982	if (ret)
 983		return ret;
 984
 985	dev_load(net, iwr->ifr_name);
 986	rtnl_lock();
 987	ret = wireless_process_ioctl(net, iwr, cmd, info, standard, private);
 988	rtnl_unlock();
 989
 990	return ret;
 991}
 992
 993/*
 994 * Wrapper to call a standard Wireless Extension handler.
 995 * We do various checks and also take care of moving data between
 996 * user space and kernel space.
 997 */
 998static int ioctl_standard_call(struct net_device *	dev,
 999			       struct iwreq		*iwr,
1000			       unsigned int		cmd,
1001			       struct iw_request_info	*info,
1002			       iw_handler		handler)
1003{
1004	const struct iw_ioctl_description *	descr;
1005	int					ret = -EINVAL;
1006
1007	/* Get the description of the IOCTL */
1008	if (IW_IOCTL_IDX(cmd) >= standard_ioctl_num)
1009		return -EOPNOTSUPP;
1010	descr = &(standard_ioctl[IW_IOCTL_IDX(cmd)]);
1011
1012	/* Check if we have a pointer to user space data or not */
1013	if (descr->header_type != IW_HEADER_TYPE_POINT) {
1014
1015		/* No extra arguments. Trivial to handle */
1016		ret = handler(dev, info, &(iwr->u), NULL);
1017
1018		/* Generate an event to notify listeners of the change */
1019		if ((descr->flags & IW_DESCR_FLAG_EVENT) &&
1020		   ((ret == 0) || (ret == -EIWCOMMIT)))
1021			wireless_send_event(dev, cmd, &(iwr->u), NULL);
1022	} else {
1023		ret = ioctl_standard_iw_point(&iwr->u.data, cmd, descr,
1024					      handler, dev, info);
1025	}
1026
1027	/* Call commit handler if needed and defined */
1028	if (ret == -EIWCOMMIT)
1029		ret = call_commit_handler(dev);
1030
1031	/* Here, we will generate the appropriate event if needed */
1032
1033	return ret;
1034}
1035
1036
1037int wext_handle_ioctl(struct net *net, unsigned int cmd, void __user *arg)
1038{
1039	struct iw_request_info info = { .cmd = cmd, .flags = 0 };
1040	struct iwreq iwr;
1041	int ret;
1042
1043	if (copy_from_user(&iwr, arg, sizeof(iwr)))
1044		return -EFAULT;
1045
1046	iwr.ifr_name[sizeof(iwr.ifr_name) - 1] = 0;
1047
1048	ret = wext_ioctl_dispatch(net, &iwr, cmd, &info,
1049				  ioctl_standard_call,
1050				  ioctl_private_call);
1051	if (ret >= 0 &&
1052	    IW_IS_GET(cmd) &&
1053	    copy_to_user(arg, &iwr, sizeof(struct iwreq)))
1054		return -EFAULT;
1055
1056	return ret;
1057}
1058
1059#ifdef CONFIG_COMPAT
1060static int compat_standard_call(struct net_device	*dev,
1061				struct iwreq		*iwr,
1062				unsigned int		cmd,
1063				struct iw_request_info	*info,
1064				iw_handler		handler)
1065{
1066	const struct iw_ioctl_description *descr;
1067	struct compat_iw_point *iwp_compat;
1068	struct iw_point iwp;
1069	int err;
1070
1071	descr = standard_ioctl + IW_IOCTL_IDX(cmd);
1072
1073	if (descr->header_type != IW_HEADER_TYPE_POINT)
1074		return ioctl_standard_call(dev, iwr, cmd, info, handler);
1075
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;
1080
1081	err = ioctl_standard_iw_point(&iwp, cmd, descr, handler, dev, info);
1082
1083	iwp_compat->pointer = ptr_to_compat(iwp.pointer);
1084	iwp_compat->length = iwp.length;
1085	iwp_compat->flags = iwp.flags;
1086
1087	return err;
1088}
1089
1090int compat_wext_handle_ioctl(struct net *net, unsigned int cmd,
1091			     unsigned long arg)
1092{
1093	void __user *argp = (void __user *)arg;
1094	struct iw_request_info info;
1095	struct iwreq iwr;
1096	char *colon;
1097	int ret;
1098
1099	if (copy_from_user(&iwr, argp, sizeof(struct iwreq)))
1100		return -EFAULT;
1101
1102	iwr.ifr_name[IFNAMSIZ-1] = 0;
1103	colon = strchr(iwr.ifr_name, ':');
1104	if (colon)
1105		*colon = 0;
1106
1107	info.cmd = cmd;
1108	info.flags = IW_REQUEST_FLAG_COMPAT;
1109
1110	ret = wext_ioctl_dispatch(net, &iwr, cmd, &info,
1111				  compat_standard_call,
1112				  compat_private_call);
1113
1114	if (ret >= 0 &&
1115	    IW_IS_GET(cmd) &&
1116	    copy_to_user(argp, &iwr, sizeof(struct iwreq)))
1117		return -EFAULT;
1118
1119	return ret;
1120}
1121#endif
1122
1123char *iwe_stream_add_event(struct iw_request_info *info, char *stream,
1124			   char *ends, struct iw_event *iwe, int event_len)
1125{
1126	int lcp_len = iwe_stream_lcp_len(info);
1127
1128	event_len = iwe_stream_event_len_adjust(info, event_len);
1129
1130	/* Check if it's possible */
1131	if (likely((stream + event_len) < ends)) {
1132		iwe->len = event_len;
1133		/* Beware of alignement issues on 64 bits */
1134		memcpy(stream, (char *) iwe, IW_EV_LCP_PK_LEN);
1135		memcpy(stream + lcp_len, &iwe->u,
1136		       event_len - lcp_len);
1137		stream += event_len;
1138	}
1139
1140	return stream;
1141}
1142EXPORT_SYMBOL(iwe_stream_add_event);
1143
1144char *iwe_stream_add_point(struct iw_request_info *info, char *stream,
1145			   char *ends, struct iw_event *iwe, char *extra)
1146{
1147	int event_len = iwe_stream_point_len(info) + iwe->u.data.length;
1148	int point_len = iwe_stream_point_len(info);
1149	int lcp_len   = iwe_stream_lcp_len(info);
1150
1151	/* Check if it's possible */
1152	if (likely((stream + event_len) < ends)) {
1153		iwe->len = event_len;
1154		memcpy(stream, (char *) iwe, IW_EV_LCP_PK_LEN);
1155		memcpy(stream + lcp_len,
1156		       ((char *) &iwe->u) + IW_EV_POINT_OFF,
1157		       IW_EV_POINT_PK_LEN - IW_EV_LCP_PK_LEN);
1158		if (iwe->u.data.length && extra)
1159			memcpy(stream + point_len, extra, iwe->u.data.length);
1160		stream += event_len;
1161	}
1162
1163	return stream;
1164}
1165EXPORT_SYMBOL(iwe_stream_add_point);
1166
1167char *iwe_stream_add_value(struct iw_request_info *info, char *event,
1168			   char *value, char *ends, struct iw_event *iwe,
1169			   int event_len)
1170{
1171	int lcp_len = iwe_stream_lcp_len(info);
1172
1173	/* Don't duplicate LCP */
1174	event_len -= IW_EV_LCP_LEN;
1175
1176	/* Check if it's possible */
1177	if (likely((value + event_len) < ends)) {
1178		/* Add new value */
1179		memcpy(value, &iwe->u, event_len);
1180		value += event_len;
1181		/* Patch LCP */
1182		iwe->len = value - event;
1183		memcpy(event, (char *) iwe, lcp_len);
1184	}
1185
1186	return value;
1187}
1188EXPORT_SYMBOL(iwe_stream_add_value);