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 * Copyright (C) 2024 Intel Corporation
   8 *
   9 * (As all part of the Linux kernel, this file is GPL)
  10 */
  11#include <linux/kernel.h>
  12#include <linux/netdevice.h>
  13#include <linux/rtnetlink.h>
  14#include <linux/slab.h>
  15#include <linux/wireless.h>
  16#include <linux/uaccess.h>
  17#include <linux/export.h>
  18#include <net/cfg80211.h>
  19#include <net/iw_handler.h>
  20#include <net/netlink.h>
  21#include <net/wext.h>
  22#include <net/net_namespace.h>
  23
  24typedef int (*wext_ioctl_func)(struct net_device *, struct iwreq *,
  25			       unsigned int, struct iw_request_info *,
  26			       iw_handler);
  27
  28
  29/*
  30 * Meta-data about all the standard Wireless Extension request we
  31 * know about.
  32 */
  33static const struct iw_ioctl_description standard_ioctl[] = {
  34	[IW_IOCTL_IDX(SIOCSIWCOMMIT)] = {
  35		.header_type	= IW_HEADER_TYPE_NULL,
  36	},
  37	[IW_IOCTL_IDX(SIOCGIWNAME)] = {
  38		.header_type	= IW_HEADER_TYPE_CHAR,
  39		.flags		= IW_DESCR_FLAG_DUMP,
  40	},
  41	[IW_IOCTL_IDX(SIOCSIWNWID)] = {
  42		.header_type	= IW_HEADER_TYPE_PARAM,
  43		.flags		= IW_DESCR_FLAG_EVENT,
  44	},
  45	[IW_IOCTL_IDX(SIOCGIWNWID)] = {
  46		.header_type	= IW_HEADER_TYPE_PARAM,
  47		.flags		= IW_DESCR_FLAG_DUMP,
  48	},
  49	[IW_IOCTL_IDX(SIOCSIWFREQ)] = {
  50		.header_type	= IW_HEADER_TYPE_FREQ,
  51		.flags		= IW_DESCR_FLAG_EVENT,
  52	},
  53	[IW_IOCTL_IDX(SIOCGIWFREQ)] = {
  54		.header_type	= IW_HEADER_TYPE_FREQ,
  55		.flags		= IW_DESCR_FLAG_DUMP,
  56	},
  57	[IW_IOCTL_IDX(SIOCSIWMODE)] = {
  58		.header_type	= IW_HEADER_TYPE_UINT,
  59		.flags		= IW_DESCR_FLAG_EVENT,
  60	},
  61	[IW_IOCTL_IDX(SIOCGIWMODE)] = {
  62		.header_type	= IW_HEADER_TYPE_UINT,
  63		.flags		= IW_DESCR_FLAG_DUMP,
  64	},
  65	[IW_IOCTL_IDX(SIOCSIWSENS)] = {
  66		.header_type	= IW_HEADER_TYPE_PARAM,
  67	},
  68	[IW_IOCTL_IDX(SIOCGIWSENS)] = {
  69		.header_type	= IW_HEADER_TYPE_PARAM,
  70	},
  71	[IW_IOCTL_IDX(SIOCSIWRANGE)] = {
  72		.header_type	= IW_HEADER_TYPE_NULL,
  73	},
  74	[IW_IOCTL_IDX(SIOCGIWRANGE)] = {
  75		.header_type	= IW_HEADER_TYPE_POINT,
  76		.token_size	= 1,
  77		.max_tokens	= sizeof(struct iw_range),
  78		.flags		= IW_DESCR_FLAG_DUMP,
  79	},
  80	[IW_IOCTL_IDX(SIOCSIWPRIV)] = {
  81		.header_type	= IW_HEADER_TYPE_NULL,
  82	},
  83	[IW_IOCTL_IDX(SIOCGIWPRIV)] = { /* (handled directly by us) */
  84		.header_type	= IW_HEADER_TYPE_POINT,
  85		.token_size	= sizeof(struct iw_priv_args),
  86		.max_tokens	= 16,
  87		.flags		= IW_DESCR_FLAG_NOMAX,
  88	},
  89	[IW_IOCTL_IDX(SIOCSIWSTATS)] = {
  90		.header_type	= IW_HEADER_TYPE_NULL,
  91	},
  92	[IW_IOCTL_IDX(SIOCGIWSTATS)] = { /* (handled directly by us) */
  93		.header_type	= IW_HEADER_TYPE_POINT,
  94		.token_size	= 1,
  95		.max_tokens	= sizeof(struct iw_statistics),
  96		.flags		= IW_DESCR_FLAG_DUMP,
  97	},
  98	[IW_IOCTL_IDX(SIOCSIWSPY)] = {
  99		.header_type	= IW_HEADER_TYPE_POINT,
 100		.token_size	= sizeof(struct sockaddr),
 101		.max_tokens	= IW_MAX_SPY,
 102	},
 103	[IW_IOCTL_IDX(SIOCGIWSPY)] = {
 104		.header_type	= IW_HEADER_TYPE_POINT,
 105		.token_size	= sizeof(struct sockaddr) +
 106				  sizeof(struct iw_quality),
 107		.max_tokens	= IW_MAX_SPY,
 108	},
 109	[IW_IOCTL_IDX(SIOCSIWTHRSPY)] = {
 110		.header_type	= IW_HEADER_TYPE_POINT,
 111		.token_size	= sizeof(struct iw_thrspy),
 112		.min_tokens	= 1,
 113		.max_tokens	= 1,
 114	},
 115	[IW_IOCTL_IDX(SIOCGIWTHRSPY)] = {
 116		.header_type	= IW_HEADER_TYPE_POINT,
 117		.token_size	= sizeof(struct iw_thrspy),
 118		.min_tokens	= 1,
 119		.max_tokens	= 1,
 120	},
 121	[IW_IOCTL_IDX(SIOCSIWAP)] = {
 122		.header_type	= IW_HEADER_TYPE_ADDR,
 123	},
 124	[IW_IOCTL_IDX(SIOCGIWAP)] = {
 125		.header_type	= IW_HEADER_TYPE_ADDR,
 126		.flags		= IW_DESCR_FLAG_DUMP,
 127	},
 128	[IW_IOCTL_IDX(SIOCSIWMLME)] = {
 129		.header_type	= IW_HEADER_TYPE_POINT,
 130		.token_size	= 1,
 131		.min_tokens	= sizeof(struct iw_mlme),
 132		.max_tokens	= sizeof(struct iw_mlme),
 133	},
 134	[IW_IOCTL_IDX(SIOCGIWAPLIST)] = {
 135		.header_type	= IW_HEADER_TYPE_POINT,
 136		.token_size	= sizeof(struct sockaddr) +
 137				  sizeof(struct iw_quality),
 138		.max_tokens	= IW_MAX_AP,
 139		.flags		= IW_DESCR_FLAG_NOMAX,
 140	},
 141	[IW_IOCTL_IDX(SIOCSIWSCAN)] = {
 142		.header_type	= IW_HEADER_TYPE_POINT,
 143		.token_size	= 1,
 144		.min_tokens	= 0,
 145		.max_tokens	= sizeof(struct iw_scan_req),
 146	},
 147	[IW_IOCTL_IDX(SIOCGIWSCAN)] = {
 148		.header_type	= IW_HEADER_TYPE_POINT,
 149		.token_size	= 1,
 150		.max_tokens	= IW_SCAN_MAX_DATA,
 151		.flags		= IW_DESCR_FLAG_NOMAX,
 152	},
 153	[IW_IOCTL_IDX(SIOCSIWESSID)] = {
 154		.header_type	= IW_HEADER_TYPE_POINT,
 155		.token_size	= 1,
 156		.max_tokens	= IW_ESSID_MAX_SIZE,
 157		.flags		= IW_DESCR_FLAG_EVENT,
 158	},
 159	[IW_IOCTL_IDX(SIOCGIWESSID)] = {
 160		.header_type	= IW_HEADER_TYPE_POINT,
 161		.token_size	= 1,
 162		.max_tokens	= IW_ESSID_MAX_SIZE,
 163		.flags		= IW_DESCR_FLAG_DUMP,
 164	},
 165	[IW_IOCTL_IDX(SIOCSIWNICKN)] = {
 166		.header_type	= IW_HEADER_TYPE_POINT,
 167		.token_size	= 1,
 168		.max_tokens	= IW_ESSID_MAX_SIZE,
 169	},
 170	[IW_IOCTL_IDX(SIOCGIWNICKN)] = {
 171		.header_type	= IW_HEADER_TYPE_POINT,
 172		.token_size	= 1,
 173		.max_tokens	= IW_ESSID_MAX_SIZE,
 174	},
 175	[IW_IOCTL_IDX(SIOCSIWRATE)] = {
 176		.header_type	= IW_HEADER_TYPE_PARAM,
 177	},
 178	[IW_IOCTL_IDX(SIOCGIWRATE)] = {
 179		.header_type	= IW_HEADER_TYPE_PARAM,
 180	},
 181	[IW_IOCTL_IDX(SIOCSIWRTS)] = {
 182		.header_type	= IW_HEADER_TYPE_PARAM,
 183	},
 184	[IW_IOCTL_IDX(SIOCGIWRTS)] = {
 185		.header_type	= IW_HEADER_TYPE_PARAM,
 186	},
 187	[IW_IOCTL_IDX(SIOCSIWFRAG)] = {
 188		.header_type	= IW_HEADER_TYPE_PARAM,
 189	},
 190	[IW_IOCTL_IDX(SIOCGIWFRAG)] = {
 191		.header_type	= IW_HEADER_TYPE_PARAM,
 192	},
 193	[IW_IOCTL_IDX(SIOCSIWTXPOW)] = {
 194		.header_type	= IW_HEADER_TYPE_PARAM,
 195	},
 196	[IW_IOCTL_IDX(SIOCGIWTXPOW)] = {
 197		.header_type	= IW_HEADER_TYPE_PARAM,
 198	},
 199	[IW_IOCTL_IDX(SIOCSIWRETRY)] = {
 200		.header_type	= IW_HEADER_TYPE_PARAM,
 201	},
 202	[IW_IOCTL_IDX(SIOCGIWRETRY)] = {
 203		.header_type	= IW_HEADER_TYPE_PARAM,
 204	},
 205	[IW_IOCTL_IDX(SIOCSIWENCODE)] = {
 206		.header_type	= IW_HEADER_TYPE_POINT,
 207		.token_size	= 1,
 208		.max_tokens	= IW_ENCODING_TOKEN_MAX,
 209		.flags		= IW_DESCR_FLAG_EVENT | IW_DESCR_FLAG_RESTRICT,
 210	},
 211	[IW_IOCTL_IDX(SIOCGIWENCODE)] = {
 212		.header_type	= IW_HEADER_TYPE_POINT,
 213		.token_size	= 1,
 214		.max_tokens	= IW_ENCODING_TOKEN_MAX,
 215		.flags		= IW_DESCR_FLAG_DUMP | IW_DESCR_FLAG_RESTRICT,
 216	},
 217	[IW_IOCTL_IDX(SIOCSIWPOWER)] = {
 218		.header_type	= IW_HEADER_TYPE_PARAM,
 219	},
 220	[IW_IOCTL_IDX(SIOCGIWPOWER)] = {
 221		.header_type	= IW_HEADER_TYPE_PARAM,
 222	},
 223	[IW_IOCTL_IDX(SIOCSIWGENIE)] = {
 224		.header_type	= IW_HEADER_TYPE_POINT,
 225		.token_size	= 1,
 226		.max_tokens	= IW_GENERIC_IE_MAX,
 227	},
 228	[IW_IOCTL_IDX(SIOCGIWGENIE)] = {
 229		.header_type	= IW_HEADER_TYPE_POINT,
 230		.token_size	= 1,
 231		.max_tokens	= IW_GENERIC_IE_MAX,
 232	},
 233	[IW_IOCTL_IDX(SIOCSIWAUTH)] = {
 234		.header_type	= IW_HEADER_TYPE_PARAM,
 235	},
 236	[IW_IOCTL_IDX(SIOCGIWAUTH)] = {
 237		.header_type	= IW_HEADER_TYPE_PARAM,
 238	},
 239	[IW_IOCTL_IDX(SIOCSIWENCODEEXT)] = {
 240		.header_type	= IW_HEADER_TYPE_POINT,
 241		.token_size	= 1,
 242		.min_tokens	= sizeof(struct iw_encode_ext),
 243		.max_tokens	= sizeof(struct iw_encode_ext) +
 244				  IW_ENCODING_TOKEN_MAX,
 245	},
 246	[IW_IOCTL_IDX(SIOCGIWENCODEEXT)] = {
 247		.header_type	= IW_HEADER_TYPE_POINT,
 248		.token_size	= 1,
 249		.min_tokens	= sizeof(struct iw_encode_ext),
 250		.max_tokens	= sizeof(struct iw_encode_ext) +
 251				  IW_ENCODING_TOKEN_MAX,
 252	},
 253	[IW_IOCTL_IDX(SIOCSIWPMKSA)] = {
 254		.header_type	= IW_HEADER_TYPE_POINT,
 255		.token_size	= 1,
 256		.min_tokens	= sizeof(struct iw_pmksa),
 257		.max_tokens	= sizeof(struct iw_pmksa),
 258	},
 259};
 260static const unsigned int standard_ioctl_num = ARRAY_SIZE(standard_ioctl);
 261
 262/*
 263 * Meta-data about all the additional standard Wireless Extension events
 264 * we know about.
 265 */
 266static const struct iw_ioctl_description standard_event[] = {
 267	[IW_EVENT_IDX(IWEVTXDROP)] = {
 268		.header_type	= IW_HEADER_TYPE_ADDR,
 269	},
 270	[IW_EVENT_IDX(IWEVQUAL)] = {
 271		.header_type	= IW_HEADER_TYPE_QUAL,
 272	},
 273	[IW_EVENT_IDX(IWEVCUSTOM)] = {
 274		.header_type	= IW_HEADER_TYPE_POINT,
 275		.token_size	= 1,
 276		.max_tokens	= IW_CUSTOM_MAX,
 277	},
 278	[IW_EVENT_IDX(IWEVREGISTERED)] = {
 279		.header_type	= IW_HEADER_TYPE_ADDR,
 280	},
 281	[IW_EVENT_IDX(IWEVEXPIRED)] = {
 282		.header_type	= IW_HEADER_TYPE_ADDR,
 283	},
 284	[IW_EVENT_IDX(IWEVGENIE)] = {
 285		.header_type	= IW_HEADER_TYPE_POINT,
 286		.token_size	= 1,
 287		.max_tokens	= IW_GENERIC_IE_MAX,
 288	},
 289	[IW_EVENT_IDX(IWEVMICHAELMICFAILURE)] = {
 290		.header_type	= IW_HEADER_TYPE_POINT,
 291		.token_size	= 1,
 292		.max_tokens	= sizeof(struct iw_michaelmicfailure),
 293	},
 294	[IW_EVENT_IDX(IWEVASSOCREQIE)] = {
 295		.header_type	= IW_HEADER_TYPE_POINT,
 296		.token_size	= 1,
 297		.max_tokens	= IW_GENERIC_IE_MAX,
 298	},
 299	[IW_EVENT_IDX(IWEVASSOCRESPIE)] = {
 300		.header_type	= IW_HEADER_TYPE_POINT,
 301		.token_size	= 1,
 302		.max_tokens	= IW_GENERIC_IE_MAX,
 303	},
 304	[IW_EVENT_IDX(IWEVPMKIDCAND)] = {
 305		.header_type	= IW_HEADER_TYPE_POINT,
 306		.token_size	= 1,
 307		.max_tokens	= sizeof(struct iw_pmkid_cand),
 308	},
 309};
 310static const unsigned int standard_event_num = ARRAY_SIZE(standard_event);
 311
 312/* Size (in bytes) of various events */
 313static const int event_type_size[] = {
 314	IW_EV_LCP_LEN,			/* IW_HEADER_TYPE_NULL */
 315	0,
 316	IW_EV_CHAR_LEN,			/* IW_HEADER_TYPE_CHAR */
 317	0,
 318	IW_EV_UINT_LEN,			/* IW_HEADER_TYPE_UINT */
 319	IW_EV_FREQ_LEN,			/* IW_HEADER_TYPE_FREQ */
 320	IW_EV_ADDR_LEN,			/* IW_HEADER_TYPE_ADDR */
 321	0,
 322	IW_EV_POINT_LEN,		/* Without variable payload */
 323	IW_EV_PARAM_LEN,		/* IW_HEADER_TYPE_PARAM */
 324	IW_EV_QUAL_LEN,			/* IW_HEADER_TYPE_QUAL */
 325};
 326
 327#ifdef CONFIG_COMPAT
 328static const int compat_event_type_size[] = {
 329	IW_EV_COMPAT_LCP_LEN,		/* IW_HEADER_TYPE_NULL */
 330	0,
 331	IW_EV_COMPAT_CHAR_LEN,		/* IW_HEADER_TYPE_CHAR */
 332	0,
 333	IW_EV_COMPAT_UINT_LEN,		/* IW_HEADER_TYPE_UINT */
 334	IW_EV_COMPAT_FREQ_LEN,		/* IW_HEADER_TYPE_FREQ */
 335	IW_EV_COMPAT_ADDR_LEN,		/* IW_HEADER_TYPE_ADDR */
 336	0,
 337	IW_EV_COMPAT_POINT_LEN,		/* Without variable payload */
 338	IW_EV_COMPAT_PARAM_LEN,		/* IW_HEADER_TYPE_PARAM */
 339	IW_EV_COMPAT_QUAL_LEN,		/* IW_HEADER_TYPE_QUAL */
 340};
 341#endif
 342
 343
 344/* IW event code */
 345
 346void wireless_nlevent_flush(void)
 347{
 348	struct sk_buff *skb;
 349	struct net *net;
 350
 351	down_read(&net_rwsem);
 352	for_each_net(net) {
 353		while ((skb = skb_dequeue(&net->wext_nlevents)))
 354			rtnl_notify(skb, net, 0, RTNLGRP_LINK, NULL,
 355				    GFP_KERNEL);
 356	}
 357	up_read(&net_rwsem);
 358}
 359EXPORT_SYMBOL_GPL(wireless_nlevent_flush);
 360
 361static int wext_netdev_notifier_call(struct notifier_block *nb,
 362				     unsigned long state, void *ptr)
 363{
 364	/*
 365	 * When a netdev changes state in any way, flush all pending messages
 366	 * to avoid them going out in a strange order, e.g. RTM_NEWLINK after
 367	 * RTM_DELLINK, or with IFF_UP after without IFF_UP during dev_close()
 368	 * or similar - all of which could otherwise happen due to delays from
 369	 * schedule_work().
 370	 */
 371	wireless_nlevent_flush();
 372
 373	return NOTIFY_OK;
 374}
 375
 376static struct notifier_block wext_netdev_notifier = {
 377	.notifier_call = wext_netdev_notifier_call,
 378};
 379
 380static int __net_init wext_pernet_init(struct net *net)
 381{
 382	skb_queue_head_init(&net->wext_nlevents);
 383	return 0;
 384}
 385
 386static void __net_exit wext_pernet_exit(struct net *net)
 387{
 388	skb_queue_purge(&net->wext_nlevents);
 389}
 390
 391static struct pernet_operations wext_pernet_ops = {
 392	.init = wext_pernet_init,
 393	.exit = wext_pernet_exit,
 394};
 395
 396static int __init wireless_nlevent_init(void)
 397{
 398	int err = register_pernet_subsys(&wext_pernet_ops);
 399
 400	if (err)
 401		return err;
 402
 403	err = register_netdevice_notifier(&wext_netdev_notifier);
 404	if (err)
 405		unregister_pernet_subsys(&wext_pernet_ops);
 406	return err;
 407}
 408
 409subsys_initcall(wireless_nlevent_init);
 410
 411/* Process events generated by the wireless layer or the driver. */
 412static void wireless_nlevent_process(struct work_struct *work)
 413{
 414	wireless_nlevent_flush();
 415}
 416
 417static DECLARE_WORK(wireless_nlevent_work, wireless_nlevent_process);
 418
 419static struct nlmsghdr *rtnetlink_ifinfo_prep(struct net_device *dev,
 420					      struct sk_buff *skb)
 421{
 422	struct ifinfomsg *r;
 423	struct nlmsghdr  *nlh;
 424
 425	nlh = nlmsg_put(skb, 0, 0, RTM_NEWLINK, sizeof(*r), 0);
 426	if (!nlh)
 427		return NULL;
 428
 429	r = nlmsg_data(nlh);
 430	r->ifi_family = AF_UNSPEC;
 431	r->__ifi_pad = 0;
 432	r->ifi_type = dev->type;
 433	r->ifi_index = dev->ifindex;
 434	r->ifi_flags = netif_get_flags(dev);
 435	r->ifi_change = 0;	/* Wireless changes don't affect those flags */
 436
 437	if (nla_put_string(skb, IFLA_IFNAME, dev->name))
 438		goto nla_put_failure;
 439
 440	return nlh;
 441 nla_put_failure:
 442	nlmsg_cancel(skb, nlh);
 443	return NULL;
 444}
 445
 446
 447/*
 448 * Main event dispatcher. Called from other parts and drivers.
 449 * Send the event on the appropriate channels.
 450 * May be called from interrupt context.
 451 */
 452void wireless_send_event(struct net_device *	dev,
 453			 unsigned int		cmd,
 454			 union iwreq_data *	wrqu,
 455			 const char *		extra)
 456{
 457	const struct iw_ioctl_description *	descr = NULL;
 458	int extra_len = 0;
 459	struct iw_event  *event;		/* Mallocated whole event */
 460	int event_len;				/* Its size */
 461	int hdr_len;				/* Size of the event header */
 462	int wrqu_off = 0;			/* Offset in wrqu */
 463	/* Don't "optimise" the following variable, it will crash */
 464	unsigned int	cmd_index;		/* *MUST* be unsigned */
 465	struct sk_buff *skb;
 466	struct nlmsghdr *nlh;
 467	struct nlattr *nla;
 468#ifdef CONFIG_COMPAT
 469	struct __compat_iw_event *compat_event;
 470	struct compat_iw_point compat_wrqu;
 471	struct sk_buff *compskb;
 472	int ptr_len;
 473#endif
 474
 475	/*
 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
 481	 * practice.
 482	 */
 483	if (WARN_ON(cmd == SIOCGIWSCAN && extra))
 484		extra = NULL;
 485
 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]);
 491	} else {
 492		cmd_index = IW_EVENT_IDX(cmd);
 493		if (cmd_index < standard_event_num)
 494			descr = &(standard_event[cmd_index]);
 495	}
 496	/* Don't accept unknown events */
 497	if (descr == NULL) {
 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...
 504		 */
 505		netdev_err(dev, "(WE) : Invalid/Unknown Wireless Event (0x%04X)\n",
 506			   cmd);
 507		return;
 508	}
 509
 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);
 516			return;
 517		}
 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);
 521			return;
 522		}
 523		/* Calculate extra_len - extra is NULL for restricted events */
 524		if (extra != NULL)
 525			extra_len = wrqu->data.length * descr->token_size;
 526		/* Always at an offset in wrqu */
 527		wrqu_off = IW_EV_POINT_OFF;
 528	}
 529
 530	/* Total length of the event */
 531	hdr_len = event_type_size[descr->header_type];
 532	event_len = hdr_len + extra_len;
 533
 534	/*
 535	 * The problem for 64/32 bit.
 536	 *
 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)         |
 541	 *
 542	 * This padding exists because we manipulate event->u,
 543	 * and 'event' is not packed.
 544	 *
 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     |
 549	 *      | extra data  ...
 550	 *
 551	 * The second padding exists because struct iw_point is extended,
 552	 * but this depends on the platform...
 553	 *
 554	 * On 32-bit, all the padding shouldn't be there.
 555	 */
 556
 557	skb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
 558	if (!skb)
 559		return;
 560
 561	/* Send via the RtNetlink event channel */
 562	nlh = rtnetlink_ifinfo_prep(dev, skb);
 563	if (WARN_ON(!nlh)) {
 564		kfree_skb(skb);
 565		return;
 566	}
 567
 568	/* Add the wireless events in the netlink packet */
 569	nla = nla_reserve(skb, IFLA_WIRELESS, event_len);
 570	if (!nla) {
 571		kfree_skb(skb);
 572		return;
 573	}
 574	event = nla_data(nla);
 575
 576	/* Fill event - first clear to avoid data leaking */
 577	memset(event, 0, hdr_len);
 578	event->len = event_len;
 579	event->cmd = cmd;
 580	memcpy(&event->u, ((char *) wrqu) + wrqu_off, hdr_len - IW_EV_LCP_LEN);
 581	if (extra_len)
 582		memcpy(((char *) event) + hdr_len, extra, extra_len);
 583
 584	nlmsg_end(skb, nlh);
 585#ifdef CONFIG_COMPAT
 586	hdr_len = compat_event_type_size[descr->header_type];
 587
 588	/* ptr_len is remaining size in event header apart from LCP */
 589	ptr_len = hdr_len - IW_EV_COMPAT_LCP_LEN;
 590	event_len = hdr_len + extra_len;
 591
 592	compskb = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_ATOMIC);
 593	if (!compskb) {
 594		kfree_skb(skb);
 595		return;
 596	}
 597
 598	/* Send via the RtNetlink event channel */
 599	nlh = rtnetlink_ifinfo_prep(dev, compskb);
 600	if (WARN_ON(!nlh)) {
 601		kfree_skb(skb);
 602		kfree_skb(compskb);
 603		return;
 604	}
 605
 606	/* Add the wireless events in the netlink packet */
 607	nla = nla_reserve(compskb, IFLA_WIRELESS, event_len);
 608	if (!nla) {
 609		kfree_skb(skb);
 610		kfree_skb(compskb);
 611		return;
 612	}
 613	compat_event = nla_data(nla);
 614
 615	compat_event->len = event_len;
 616	compat_event->cmd = cmd;
 617	if (descr->header_type == IW_HEADER_TYPE_POINT) {
 618		compat_wrqu.length = wrqu->data.length;
 619		compat_wrqu.flags = wrqu->data.flags;
 620		memcpy(compat_event->ptr_bytes,
 621		       ((char *)&compat_wrqu) + IW_EV_COMPAT_POINT_OFF,
 622			ptr_len);
 623		if (extra_len)
 624			memcpy(&compat_event->ptr_bytes[ptr_len],
 625			       extra, extra_len);
 626	} else {
 627		/* extra_len must be zero, so no if (extra) needed */
 628		memcpy(compat_event->ptr_bytes, wrqu, ptr_len);
 629	}
 630
 631	nlmsg_end(compskb, nlh);
 632
 633	skb_shinfo(skb)->frag_list = compskb;
 634#endif
 635	skb_queue_tail(&dev_net(dev)->wext_nlevents, skb);
 636	schedule_work(&wireless_nlevent_work);
 637}
 638EXPORT_SYMBOL(wireless_send_event);
 639
 640#ifdef CONFIG_CFG80211_WEXT
 641static void wireless_warn_cfg80211_wext(void)
 642{
 643	pr_warn_once("warning: `%s' uses wireless extensions which will stop working for Wi-Fi 7 hardware; use nl80211\n",
 644		     current->comm);
 645}
 646#endif
 647
 648/* IW handlers */
 649
 650struct iw_statistics *get_wireless_stats(struct net_device *dev)
 651{
 652#ifdef CONFIG_WIRELESS_EXT
 653	if ((dev->wireless_handlers != NULL) &&
 654	   (dev->wireless_handlers->get_wireless_stats != NULL))
 655		return dev->wireless_handlers->get_wireless_stats(dev);
 656#endif
 657
 658#ifdef CONFIG_CFG80211_WEXT
 659	if (dev->ieee80211_ptr &&
 660	    dev->ieee80211_ptr->wiphy &&
 661	    dev->ieee80211_ptr->wiphy->wext &&
 662	    dev->ieee80211_ptr->wiphy->wext->get_wireless_stats) {
 663		wireless_warn_cfg80211_wext();
 664		if (dev->ieee80211_ptr->wiphy->flags & (WIPHY_FLAG_SUPPORTS_MLO |
 665							WIPHY_FLAG_DISABLE_WEXT))
 666			return NULL;
 667		return dev->ieee80211_ptr->wiphy->wext->get_wireless_stats(dev);
 668	}
 669#endif
 670
 671	/* not found */
 672	return NULL;
 673}
 674
 675/* noinline to avoid a bogus warning with -O3 */
 676static noinline int iw_handler_get_iwstats(struct net_device *	dev,
 677				  struct iw_request_info *	info,
 678				  union iwreq_data *		wrqu,
 679				  char *			extra)
 680{
 681	/* Get stats from the driver */
 682	struct iw_statistics *stats;
 683
 684	stats = get_wireless_stats(dev);
 685	if (stats) {
 686		/* Copy statistics to extra */
 687		memcpy(extra, stats, sizeof(struct iw_statistics));
 688		wrqu->data.length = sizeof(struct iw_statistics);
 689
 690		/* Check if we need to clear the updated flag */
 691		if (wrqu->data.flags != 0)
 692			stats->qual.updated &= ~IW_QUAL_ALL_UPDATED;
 693		return 0;
 694	} else
 695		return -EOPNOTSUPP;
 696}
 697
 698static iw_handler get_handler(struct net_device *dev, unsigned int cmd)
 699{
 700	/* Don't "optimise" the following variable, it will crash */
 701	unsigned int	index;		/* *MUST* be unsigned */
 702	const struct iw_handler_def *handlers = NULL;
 703
 704#ifdef CONFIG_CFG80211_WEXT
 705	if (dev->ieee80211_ptr && dev->ieee80211_ptr->wiphy) {
 706		wireless_warn_cfg80211_wext();
 707		if (dev->ieee80211_ptr->wiphy->flags & (WIPHY_FLAG_SUPPORTS_MLO |
 708							WIPHY_FLAG_DISABLE_WEXT))
 709			return NULL;
 710		handlers = dev->ieee80211_ptr->wiphy->wext;
 711	}
 712#endif
 713#ifdef CONFIG_WIRELESS_EXT
 714	if (dev->wireless_handlers)
 715		handlers = dev->wireless_handlers;
 716#endif
 717
 718	if (!handlers)
 719		return NULL;
 720
 721	/* Try as a standard command */
 722	index = IW_IOCTL_IDX(cmd);
 723	if (index < handlers->num_standard)
 724		return handlers->standard[index];
 725
 726#ifdef CONFIG_WEXT_PRIV
 727	/* Try as a private command */
 728	index = cmd - SIOCIWFIRSTPRIV;
 729	if (index < handlers->num_private)
 730		return handlers->private[index];
 731#endif
 732
 733	/* Not found */
 734	return NULL;
 735}
 736
 737static int ioctl_standard_iw_point(struct iw_point *iwp, unsigned int cmd,
 738				   const struct iw_ioctl_description *descr,
 739				   iw_handler handler, struct net_device *dev,
 740				   struct iw_request_info *info)
 741{
 742	int err, extra_size, user_length = 0, essid_compat = 0;
 743	char *extra;
 744
 745	/* Calculate space needed by arguments. Always allocate
 746	 * for max space.
 747	 */
 748	extra_size = descr->max_tokens * descr->token_size;
 749
 750	/* Check need for ESSID compatibility for WE < 21 */
 751	switch (cmd) {
 752	case SIOCSIWESSID:
 753	case SIOCGIWESSID:
 754	case SIOCSIWNICKN:
 755	case SIOCGIWNICKN:
 756		if (iwp->length == descr->max_tokens + 1)
 757			essid_compat = 1;
 758		else if (IW_IS_SET(cmd) && (iwp->length != 0)) {
 759			char essid[IW_ESSID_MAX_SIZE + 1];
 760			unsigned int len;
 761			len = iwp->length * descr->token_size;
 762
 763			if (len > IW_ESSID_MAX_SIZE)
 764				return -EFAULT;
 765
 766			err = copy_from_user(essid, iwp->pointer, len);
 767			if (err)
 768				return -EFAULT;
 769
 770			if (essid[iwp->length - 1] == '\0')
 771				essid_compat = 1;
 772		}
 773		break;
 774	default:
 775		break;
 776	}
 777
 778	iwp->length -= essid_compat;
 779
 780	/* Check what user space is giving us */
 781	if (IW_IS_SET(cmd)) {
 782		/* Check NULL pointer */
 783		if (!iwp->pointer && iwp->length != 0)
 784			return -EFAULT;
 785		/* Check if number of token fits within bounds */
 786		if (iwp->length > descr->max_tokens)
 787			return -E2BIG;
 788		if (iwp->length < descr->min_tokens)
 789			return -EINVAL;
 790	} else {
 791		/* Check NULL pointer */
 792		if (!iwp->pointer)
 793			return -EFAULT;
 794		/* Save user space buffer size for checking */
 795		user_length = iwp->length;
 796
 797		/* Don't check if user_length > max to allow forward
 798		 * compatibility. The test user_length < min is
 799		 * implied by the test at the end.
 800		 */
 801
 802		/* Support for very large requests */
 803		if ((descr->flags & IW_DESCR_FLAG_NOMAX) &&
 804		    (user_length > descr->max_tokens)) {
 805			/* Allow userspace to GET more than max so
 806			 * we can support any size GET requests.
 807			 * There is still a limit : -ENOMEM.
 808			 */
 809			extra_size = user_length * descr->token_size;
 810
 811			/* Note : user_length is originally a __u16,
 812			 * and token_size is controlled by us,
 813			 * so extra_size won't get negative and
 814			 * won't overflow...
 815			 */
 816		}
 817	}
 818
 819	/* Sanity-check to ensure we never end up _allocating_ zero
 820	 * bytes of data for extra.
 821	 */
 822	if (extra_size <= 0)
 823		return -EFAULT;
 824
 825	/* kzalloc() ensures NULL-termination for essid_compat. */
 826	extra = kzalloc(extra_size, GFP_KERNEL);
 827	if (!extra)
 828		return -ENOMEM;
 829
 830	/* If it is a SET, get all the extra data in here */
 831	if (IW_IS_SET(cmd) && (iwp->length != 0)) {
 832		if (copy_from_user(extra, iwp->pointer,
 833				   iwp->length *
 834				   descr->token_size)) {
 835			err = -EFAULT;
 836			goto out;
 837		}
 838
 839		if (cmd == SIOCSIWENCODEEXT) {
 840			struct iw_encode_ext *ee = (void *) extra;
 841
 842			if (iwp->length < sizeof(*ee) + ee->key_len) {
 843				err = -EFAULT;
 844				goto out;
 845			}
 846		}
 847	}
 848
 849	if (IW_IS_GET(cmd) && !(descr->flags & IW_DESCR_FLAG_NOMAX)) {
 850		/*
 851		 * If this is a GET, but not NOMAX, it means that the extra
 852		 * data is not bounded by userspace, but by max_tokens. Thus
 853		 * set the length to max_tokens. This matches the extra data
 854		 * allocation.
 855		 * The driver should fill it with the number of tokens it
 856		 * provided, and it may check iwp->length rather than having
 857		 * knowledge of max_tokens. If the driver doesn't change the
 858		 * iwp->length, this ioctl just copies back max_token tokens
 859		 * filled with zeroes. Hopefully the driver isn't claiming
 860		 * them to be valid data.
 861		 */
 862		iwp->length = descr->max_tokens;
 863	}
 864
 865	err = handler(dev, info, (union iwreq_data *) iwp, extra);
 866
 867	iwp->length += essid_compat;
 868
 869	/* If we have something to return to the user */
 870	if (!err && IW_IS_GET(cmd)) {
 871		/* Check if there is enough buffer up there */
 872		if (user_length < iwp->length) {
 873			err = -E2BIG;
 874			goto out;
 875		}
 876
 877		if (copy_to_user(iwp->pointer, extra,
 878				 iwp->length *
 879				 descr->token_size)) {
 880			err = -EFAULT;
 881			goto out;
 882		}
 883	}
 884
 885	/* Generate an event to notify listeners of the change */
 886	if ((descr->flags & IW_DESCR_FLAG_EVENT) &&
 887	    ((err == 0) || (err == -EIWCOMMIT))) {
 888		union iwreq_data *data = (union iwreq_data *) iwp;
 889
 890		if (descr->flags & IW_DESCR_FLAG_RESTRICT)
 891			/* If the event is restricted, don't
 892			 * export the payload.
 893			 */
 894			wireless_send_event(dev, cmd, data, NULL);
 895		else
 896			wireless_send_event(dev, cmd, data, extra);
 897	}
 898
 899out:
 900	kfree(extra);
 901	return err;
 902}
 903
 904/*
 905 * Call the commit handler in the driver
 906 * (if exist and if conditions are right)
 907 *
 908 * Note : our current commit strategy is currently pretty dumb,
 909 * but we will be able to improve on that...
 910 * The goal is to try to agreagate as many changes as possible
 911 * before doing the commit. Drivers that will define a commit handler
 912 * are usually those that need a reset after changing parameters, so
 913 * we want to minimise the number of reset.
 914 * A cool idea is to use a timer : at each "set" command, we re-set the
 915 * timer, when the timer eventually fires, we call the driver.
 916 * Hopefully, more on that later.
 917 *
 918 * Also, I'm waiting to see how many people will complain about the
 919 * netif_running(dev) test. I'm open on that one...
 920 * Hopefully, the driver will remember to do a commit in "open()" ;-)
 921 */
 922int call_commit_handler(struct net_device *dev)
 923{
 924#ifdef CONFIG_WIRELESS_EXT
 925	if (netif_running(dev) &&
 926	    dev->wireless_handlers &&
 927	    dev->wireless_handlers->standard[0])
 928		/* Call the commit handler on the driver */
 929		return dev->wireless_handlers->standard[0](dev, NULL,
 930							   NULL, NULL);
 931	else
 932		return 0;		/* Command completed successfully */
 933#else
 934	/* cfg80211 has no commit */
 935	return 0;
 936#endif
 937}
 938
 939/*
 940 * Main IOCTl dispatcher.
 941 * Check the type of IOCTL and call the appropriate wrapper...
 942 */
 943static int wireless_process_ioctl(struct net *net, struct iwreq *iwr,
 944				  unsigned int cmd,
 945				  struct iw_request_info *info,
 946				  wext_ioctl_func standard,
 947				  wext_ioctl_func private)
 948{
 949	struct net_device *dev;
 950	iw_handler	handler;
 951
 952	/* Permissions are already checked in dev_ioctl() before calling us.
 953	 * The copy_to/from_user() of ifr is also dealt with in there */
 954
 955	/* Make sure the device exist */
 956	if ((dev = __dev_get_by_name(net, iwr->ifr_name)) == NULL)
 957		return -ENODEV;
 958
 959	/* A bunch of special cases, then the generic case...
 960	 * Note that 'cmd' is already filtered in dev_ioctl() with
 961	 * (cmd >= SIOCIWFIRST && cmd <= SIOCIWLAST) */
 962	if (cmd == SIOCGIWSTATS)
 963		return standard(dev, iwr, cmd, info,
 964				&iw_handler_get_iwstats);
 965
 966#ifdef CONFIG_WEXT_PRIV
 967	if (cmd == SIOCGIWPRIV && dev->wireless_handlers)
 968		return standard(dev, iwr, cmd, info,
 969				iw_handler_get_private);
 970#endif
 971
 972	/* Basic check */
 973	if (!netif_device_present(dev))
 974		return -ENODEV;
 975
 976	/* New driver API : try to find the handler */
 977	handler = get_handler(dev, cmd);
 978	if (handler) {
 979		/* Standard and private are not the same */
 980		if (cmd < SIOCIWFIRSTPRIV)
 981			return standard(dev, iwr, cmd, info, handler);
 982		else if (private)
 983			return private(dev, iwr, cmd, info, handler);
 984	}
 985	return -EOPNOTSUPP;
 986}
 987
 988/* If command is `set a parameter', or `get the encoding parameters',
 989 * check if the user has the right to do it.
 990 */
 991static int wext_permission_check(unsigned int cmd)
 992{
 993	if ((IW_IS_SET(cmd) || cmd == SIOCGIWENCODE ||
 994	     cmd == SIOCGIWENCODEEXT) &&
 995	    !capable(CAP_NET_ADMIN))
 996		return -EPERM;
 997
 998	return 0;
 999}
1000
1001/* entry point from dev ioctl */
1002static int wext_ioctl_dispatch(struct net *net, struct iwreq *iwr,
1003			       unsigned int cmd, struct iw_request_info *info,
1004			       wext_ioctl_func standard,
1005			       wext_ioctl_func private)
1006{
1007	int ret = wext_permission_check(cmd);
1008
1009	if (ret)
1010		return ret;
1011
1012	dev_load(net, iwr->ifr_name);
1013	rtnl_lock();
1014	ret = wireless_process_ioctl(net, iwr, cmd, info, standard, private);
1015	rtnl_unlock();
1016
1017	return ret;
1018}
1019
1020/*
1021 * Wrapper to call a standard Wireless Extension handler.
1022 * We do various checks and also take care of moving data between
1023 * user space and kernel space.
1024 */
1025static int ioctl_standard_call(struct net_device *	dev,
1026			       struct iwreq		*iwr,
1027			       unsigned int		cmd,
1028			       struct iw_request_info	*info,
1029			       iw_handler		handler)
1030{
1031	const struct iw_ioctl_description *	descr;
1032	int					ret = -EINVAL;
1033
1034	/* Get the description of the IOCTL */
1035	if (IW_IOCTL_IDX(cmd) >= standard_ioctl_num)
1036		return -EOPNOTSUPP;
1037	descr = &(standard_ioctl[IW_IOCTL_IDX(cmd)]);
1038
1039	/* Check if we have a pointer to user space data or not */
1040	if (descr->header_type != IW_HEADER_TYPE_POINT) {
1041
1042		/* No extra arguments. Trivial to handle */
1043		ret = handler(dev, info, &(iwr->u), NULL);
1044
1045		/* Generate an event to notify listeners of the change */
1046		if ((descr->flags & IW_DESCR_FLAG_EVENT) &&
1047		   ((ret == 0) || (ret == -EIWCOMMIT)))
1048			wireless_send_event(dev, cmd, &(iwr->u), NULL);
1049	} else {
1050		ret = ioctl_standard_iw_point(&iwr->u.data, cmd, descr,
1051					      handler, dev, info);
1052	}
1053
1054	/* Call commit handler if needed and defined */
1055	if (ret == -EIWCOMMIT)
1056		ret = call_commit_handler(dev);
1057
1058	/* Here, we will generate the appropriate event if needed */
1059
1060	return ret;
1061}
1062
1063
1064int wext_handle_ioctl(struct net *net, unsigned int cmd, void __user *arg)
1065{
1066	struct iw_request_info info = { .cmd = cmd, .flags = 0 };
1067	struct iwreq iwr;
1068	int ret;
1069
1070	if (copy_from_user(&iwr, arg, sizeof(iwr)))
1071		return -EFAULT;
1072
1073	iwr.ifr_name[sizeof(iwr.ifr_name) - 1] = 0;
1074
1075	ret = wext_ioctl_dispatch(net, &iwr, cmd, &info,
1076				  ioctl_standard_call,
1077				  ioctl_private_call);
1078	if (ret >= 0 &&
1079	    IW_IS_GET(cmd) &&
1080	    copy_to_user(arg, &iwr, sizeof(struct iwreq)))
1081		return -EFAULT;
1082
1083	return ret;
1084}
1085
1086#ifdef CONFIG_COMPAT
1087static int compat_standard_call(struct net_device	*dev,
1088				struct iwreq		*iwr,
1089				unsigned int		cmd,
1090				struct iw_request_info	*info,
1091				iw_handler		handler)
1092{
1093	const struct iw_ioctl_description *descr;
1094	struct compat_iw_point *iwp_compat;
1095	struct iw_point iwp;
1096	int err;
1097
1098	descr = standard_ioctl + IW_IOCTL_IDX(cmd);
1099
1100	if (descr->header_type != IW_HEADER_TYPE_POINT)
1101		return ioctl_standard_call(dev, iwr, cmd, info, handler);
1102
1103	iwp_compat = (struct compat_iw_point *) &iwr->u.data;
1104
1105	/* struct iw_point has a 32bit hole on 64bit arches. */
1106	memset(&iwp, 0, sizeof(iwp));
1107
1108	iwp.pointer = compat_ptr(iwp_compat->pointer);
1109	iwp.length = iwp_compat->length;
1110	iwp.flags = iwp_compat->flags;
1111
1112	err = ioctl_standard_iw_point(&iwp, cmd, descr, handler, dev, info);
1113
1114	iwp_compat->pointer = ptr_to_compat(iwp.pointer);
1115	iwp_compat->length = iwp.length;
1116	iwp_compat->flags = iwp.flags;
1117
1118	return err;
1119}
1120
1121int compat_wext_handle_ioctl(struct net *net, unsigned int cmd,
1122			     unsigned long arg)
1123{
1124	void __user *argp = (void __user *)arg;
1125	struct iw_request_info info;
1126	struct iwreq iwr;
1127	char *colon;
1128	int ret;
1129
1130	if (copy_from_user(&iwr, argp, sizeof(struct iwreq)))
1131		return -EFAULT;
1132
1133	iwr.ifr_name[IFNAMSIZ-1] = 0;
1134	colon = strchr(iwr.ifr_name, ':');
1135	if (colon)
1136		*colon = 0;
1137
1138	info.cmd = cmd;
1139	info.flags = IW_REQUEST_FLAG_COMPAT;
1140
1141	ret = wext_ioctl_dispatch(net, &iwr, cmd, &info,
1142				  compat_standard_call,
1143				  compat_private_call);
1144
1145	if (ret >= 0 &&
1146	    IW_IS_GET(cmd) &&
1147	    copy_to_user(argp, &iwr, sizeof(struct iwreq)))
1148		return -EFAULT;
1149
1150	return ret;
1151}
1152#endif
1153
1154char *iwe_stream_add_event(struct iw_request_info *info, char *stream,
1155			   char *ends, struct iw_event *iwe, int event_len)
1156{
1157	int lcp_len = iwe_stream_lcp_len(info);
1158
1159	event_len = iwe_stream_event_len_adjust(info, event_len);
1160
1161	/* Check if it's possible */
1162	if (likely((stream + event_len) < ends)) {
1163		iwe->len = event_len;
1164		/* Beware of alignment issues on 64 bits */
1165		memcpy(stream, (char *) iwe, IW_EV_LCP_PK_LEN);
1166		memcpy(stream + lcp_len, &iwe->u,
1167		       event_len - lcp_len);
1168		stream += event_len;
1169	}
1170
1171	return stream;
1172}
1173EXPORT_SYMBOL(iwe_stream_add_event);
1174
1175char *iwe_stream_add_point(struct iw_request_info *info, char *stream,
1176			   char *ends, struct iw_event *iwe, char *extra)
1177{
1178	int event_len = iwe_stream_point_len(info) + iwe->u.data.length;
1179	int point_len = iwe_stream_point_len(info);
1180	int lcp_len   = iwe_stream_lcp_len(info);
1181
1182	/* Check if it's possible */
1183	if (likely((stream + event_len) < ends)) {
1184		iwe->len = event_len;
1185		memcpy(stream, (char *) iwe, IW_EV_LCP_PK_LEN);
1186		memcpy(stream + lcp_len,
1187		       ((char *) &iwe->u) + IW_EV_POINT_OFF,
1188		       IW_EV_POINT_PK_LEN - IW_EV_LCP_PK_LEN);
1189		if (iwe->u.data.length && extra)
1190			memcpy(stream + point_len, extra, iwe->u.data.length);
1191		stream += event_len;
1192	}
1193
1194	return stream;
1195}
1196EXPORT_SYMBOL(iwe_stream_add_point);
1197
1198char *iwe_stream_add_value(struct iw_request_info *info, char *event,
1199			   char *value, char *ends, struct iw_event *iwe,
1200			   int event_len)
1201{
1202	int lcp_len = iwe_stream_lcp_len(info);
1203
1204	/* Don't duplicate LCP */
1205	event_len -= IW_EV_LCP_LEN;
1206
1207	/* Check if it's possible */
1208	if (likely((value + event_len) < ends)) {
1209		/* Add new value */
1210		memcpy(value, &iwe->u, event_len);
1211		value += event_len;
1212		/* Patch LCP */
1213		iwe->len = value - event;
1214		memcpy(event, (char *) iwe, lcp_len);
1215	}
1216
1217	return value;
1218}
1219EXPORT_SYMBOL(iwe_stream_add_value);