nl80211.c 127 KB
Newer Older
1 2 3
/*
 * This is the new netlink-based wireless configuration interface.
 *
4
 * Copyright 2006-2009	Johannes Berg <johannes@sipsolutions.net>
5 6 7 8 9 10 11 12 13 14 15
 */

#include <linux/if.h>
#include <linux/module.h>
#include <linux/err.h>
#include <linux/list.h>
#include <linux/if_ether.h>
#include <linux/ieee80211.h>
#include <linux/nl80211.h>
#include <linux/rtnetlink.h>
#include <linux/netlink.h>
16
#include <linux/etherdevice.h>
17
#include <net/net_namespace.h>
18 19
#include <net/genetlink.h>
#include <net/cfg80211.h>
20
#include <net/sock.h>
21 22
#include "core.h"
#include "nl80211.h"
23
#include "reg.h"
24 25 26 27 28 29 30 31

/* the netlink family */
static struct genl_family nl80211_fam = {
	.id = GENL_ID_GENERATE,	/* don't bother with a hardcoded ID */
	.name = "nl80211",	/* have users key off the name instead */
	.hdrsize = 0,		/* no private header */
	.version = 1,		/* no particular meaning now */
	.maxattr = NL80211_ATTR_MAX,
32
	.netnsok = true,
33 34
};

35
/* internal helper: get rdev and dev */
36
static int get_rdev_dev_by_info_ifindex(struct genl_info *info,
37
				       struct cfg80211_registered_device **rdev,
38 39
				       struct net_device **dev)
{
40
	struct nlattr **attrs = info->attrs;
41 42
	int ifindex;

Johannes Berg's avatar
Johannes Berg committed
43
	if (!attrs[NL80211_ATTR_IFINDEX])
44 45
		return -EINVAL;

Johannes Berg's avatar
Johannes Berg committed
46
	ifindex = nla_get_u32(attrs[NL80211_ATTR_IFINDEX]);
47
	*dev = dev_get_by_index(genl_info_net(info), ifindex);
48 49 50
	if (!*dev)
		return -ENODEV;

51
	*rdev = cfg80211_get_dev_from_ifindex(genl_info_net(info), ifindex);
52
	if (IS_ERR(*rdev)) {
53
		dev_put(*dev);
54
		return PTR_ERR(*rdev);
55 56 57 58 59 60 61 62 63
	}

	return 0;
}

/* policy for the attributes */
static struct nla_policy nl80211_policy[NL80211_ATTR_MAX+1] __read_mostly = {
	[NL80211_ATTR_WIPHY] = { .type = NLA_U32 },
	[NL80211_ATTR_WIPHY_NAME] = { .type = NLA_NUL_STRING,
64
				      .len = 20-1 },
65
	[NL80211_ATTR_WIPHY_TXQ_PARAMS] = { .type = NLA_NESTED },
66
	[NL80211_ATTR_WIPHY_FREQ] = { .type = NLA_U32 },
Sujith's avatar
Sujith committed
67
	[NL80211_ATTR_WIPHY_CHANNEL_TYPE] = { .type = NLA_U32 },
68 69 70 71
	[NL80211_ATTR_WIPHY_RETRY_SHORT] = { .type = NLA_U8 },
	[NL80211_ATTR_WIPHY_RETRY_LONG] = { .type = NLA_U8 },
	[NL80211_ATTR_WIPHY_FRAG_THRESHOLD] = { .type = NLA_U32 },
	[NL80211_ATTR_WIPHY_RTS_THRESHOLD] = { .type = NLA_U32 },
72
	[NL80211_ATTR_WIPHY_COVERAGE_CLASS] = { .type = NLA_U8 },
73 74 75 76

	[NL80211_ATTR_IFTYPE] = { .type = NLA_U32 },
	[NL80211_ATTR_IFINDEX] = { .type = NLA_U32 },
	[NL80211_ATTR_IFNAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ-1 },
77 78

	[NL80211_ATTR_MAC] = { .type = NLA_BINARY, .len = ETH_ALEN },
79
	[NL80211_ATTR_PREV_BSSID] = { .type = NLA_BINARY, .len = ETH_ALEN },
80

81
	[NL80211_ATTR_KEY] = { .type = NLA_NESTED, },
82 83 84 85 86
	[NL80211_ATTR_KEY_DATA] = { .type = NLA_BINARY,
				    .len = WLAN_MAX_KEY_LEN },
	[NL80211_ATTR_KEY_IDX] = { .type = NLA_U8 },
	[NL80211_ATTR_KEY_CIPHER] = { .type = NLA_U32 },
	[NL80211_ATTR_KEY_DEFAULT] = { .type = NLA_FLAG },
87
	[NL80211_ATTR_KEY_SEQ] = { .type = NLA_BINARY, .len = 8 },
88 89 90 91 92 93 94

	[NL80211_ATTR_BEACON_INTERVAL] = { .type = NLA_U32 },
	[NL80211_ATTR_DTIM_PERIOD] = { .type = NLA_U32 },
	[NL80211_ATTR_BEACON_HEAD] = { .type = NLA_BINARY,
				       .len = IEEE80211_MAX_DATA_LEN },
	[NL80211_ATTR_BEACON_TAIL] = { .type = NLA_BINARY,
				       .len = IEEE80211_MAX_DATA_LEN },
95 96 97 98 99
	[NL80211_ATTR_STA_AID] = { .type = NLA_U16 },
	[NL80211_ATTR_STA_FLAGS] = { .type = NLA_NESTED },
	[NL80211_ATTR_STA_LISTEN_INTERVAL] = { .type = NLA_U16 },
	[NL80211_ATTR_STA_SUPPORTED_RATES] = { .type = NLA_BINARY,
					       .len = NL80211_MAX_SUPP_RATES },
100
	[NL80211_ATTR_STA_PLINK_ACTION] = { .type = NLA_U8 },
101
	[NL80211_ATTR_STA_VLAN] = { .type = NLA_U32 },
Johannes Berg's avatar
Johannes Berg committed
102
	[NL80211_ATTR_MNTR_FLAGS] = { /* NLA_NESTED can't be empty */ },
103 104 105
	[NL80211_ATTR_MESH_ID] = { .type = NLA_BINARY,
				.len = IEEE80211_MAX_MESH_ID_LEN },
	[NL80211_ATTR_MPATH_NEXT_HOP] = { .type = NLA_U32 },
106

107 108 109
	[NL80211_ATTR_REG_ALPHA2] = { .type = NLA_STRING, .len = 2 },
	[NL80211_ATTR_REG_RULES] = { .type = NLA_NESTED },

110 111 112
	[NL80211_ATTR_BSS_CTS_PROT] = { .type = NLA_U8 },
	[NL80211_ATTR_BSS_SHORT_PREAMBLE] = { .type = NLA_U8 },
	[NL80211_ATTR_BSS_SHORT_SLOT_TIME] = { .type = NLA_U8 },
113 114
	[NL80211_ATTR_BSS_BASIC_RATES] = { .type = NLA_BINARY,
					   .len = NL80211_MAX_SUPP_RATES },
115

116 117
	[NL80211_ATTR_MESH_PARAMS] = { .type = NLA_NESTED },

118 119
	[NL80211_ATTR_HT_CAPABILITY] = { .type = NLA_BINARY,
					 .len = NL80211_HT_CAPABILITY_LEN },
120 121 122 123

	[NL80211_ATTR_MGMT_SUBTYPE] = { .type = NLA_U8 },
	[NL80211_ATTR_IE] = { .type = NLA_BINARY,
			      .len = IEEE80211_MAX_DATA_LEN },
124 125
	[NL80211_ATTR_SCAN_FREQUENCIES] = { .type = NLA_NESTED },
	[NL80211_ATTR_SCAN_SSIDS] = { .type = NLA_NESTED },
126 127 128 129 130

	[NL80211_ATTR_SSID] = { .type = NLA_BINARY,
				.len = IEEE80211_MAX_SSID_LEN },
	[NL80211_ATTR_AUTH_TYPE] = { .type = NLA_U32 },
	[NL80211_ATTR_REASON_CODE] = { .type = NLA_U16 },
Johannes Berg's avatar
Johannes Berg committed
131
	[NL80211_ATTR_FREQ_FIXED] = { .type = NLA_FLAG },
132
	[NL80211_ATTR_TIMED_OUT] = { .type = NLA_FLAG },
133
	[NL80211_ATTR_USE_MFP] = { .type = NLA_U32 },
134 135 136
	[NL80211_ATTR_STA_FLAGS2] = {
		.len = sizeof(struct nl80211_sta_flag_update),
	},
137
	[NL80211_ATTR_CONTROL_PORT] = { .type = NLA_FLAG },
138 139 140
	[NL80211_ATTR_PRIVACY] = { .type = NLA_FLAG },
	[NL80211_ATTR_CIPHER_SUITE_GROUP] = { .type = NLA_U32 },
	[NL80211_ATTR_WPA_VERSIONS] = { .type = NLA_U32 },
141
	[NL80211_ATTR_PID] = { .type = NLA_U32 },
142
	[NL80211_ATTR_4ADDR] = { .type = NLA_U8 },
Samuel Ortiz's avatar
Samuel Ortiz committed
143 144
	[NL80211_ATTR_PMKID] = { .type = NLA_BINARY,
				 .len = WLAN_PMKID_LEN },
145 146
	[NL80211_ATTR_DURATION] = { .type = NLA_U32 },
	[NL80211_ATTR_COOKIE] = { .type = NLA_U64 },
147
	[NL80211_ATTR_TX_RATES] = { .type = NLA_NESTED },
148 149
};

150 151 152
/* policy for the attributes */
static struct nla_policy
nl80211_key_policy[NL80211_KEY_MAX + 1] __read_mostly = {
Johannes Berg's avatar
Johannes Berg committed
153
	[NL80211_KEY_DATA] = { .type = NLA_BINARY, .len = WLAN_MAX_KEY_LEN },
154 155 156 157 158 159 160
	[NL80211_KEY_IDX] = { .type = NLA_U8 },
	[NL80211_KEY_CIPHER] = { .type = NLA_U32 },
	[NL80211_KEY_SEQ] = { .type = NLA_BINARY, .len = 8 },
	[NL80211_KEY_DEFAULT] = { .type = NLA_FLAG },
	[NL80211_KEY_DEFAULT_MGMT] = { .type = NLA_FLAG },
};

161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180
/* ifidx get helper */
static int nl80211_get_ifidx(struct netlink_callback *cb)
{
	int res;

	res = nlmsg_parse(cb->nlh, GENL_HDRLEN + nl80211_fam.hdrsize,
			  nl80211_fam.attrbuf, nl80211_fam.maxattr,
			  nl80211_policy);
	if (res)
		return res;

	if (!nl80211_fam.attrbuf[NL80211_ATTR_IFINDEX])
		return -EINVAL;

	res = nla_get_u32(nl80211_fam.attrbuf[NL80211_ATTR_IFINDEX]);
	if (!res)
		return -EINVAL;
	return res;
}

181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210
/* IE validation */
static bool is_valid_ie_attr(const struct nlattr *attr)
{
	const u8 *pos;
	int len;

	if (!attr)
		return true;

	pos = nla_data(attr);
	len = nla_len(attr);

	while (len) {
		u8 elemlen;

		if (len < 2)
			return false;
		len -= 2;

		elemlen = pos[1];
		if (elemlen > len)
			return false;

		len -= elemlen;
		pos += 2 + elemlen;
	}

	return true;
}

211 212 213 214 215 216 217 218
/* message building helper */
static inline void *nl80211hdr_put(struct sk_buff *skb, u32 pid, u32 seq,
				   int flags, u8 cmd)
{
	/* since there is no private header just add the generic one */
	return genlmsg_put(skb, pid, seq, &nl80211_fam, flags, cmd);
}

219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242
static int nl80211_msg_put_channel(struct sk_buff *msg,
				   struct ieee80211_channel *chan)
{
	NLA_PUT_U32(msg, NL80211_FREQUENCY_ATTR_FREQ,
		    chan->center_freq);

	if (chan->flags & IEEE80211_CHAN_DISABLED)
		NLA_PUT_FLAG(msg, NL80211_FREQUENCY_ATTR_DISABLED);
	if (chan->flags & IEEE80211_CHAN_PASSIVE_SCAN)
		NLA_PUT_FLAG(msg, NL80211_FREQUENCY_ATTR_PASSIVE_SCAN);
	if (chan->flags & IEEE80211_CHAN_NO_IBSS)
		NLA_PUT_FLAG(msg, NL80211_FREQUENCY_ATTR_NO_IBSS);
	if (chan->flags & IEEE80211_CHAN_RADAR)
		NLA_PUT_FLAG(msg, NL80211_FREQUENCY_ATTR_RADAR);

	NLA_PUT_U32(msg, NL80211_FREQUENCY_ATTR_MAX_TX_POWER,
		    DBM_TO_MBM(chan->max_power));

	return 0;

 nla_put_failure:
	return -ENOBUFS;
}

243 244
/* netlink command implementations */

245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338
struct key_parse {
	struct key_params p;
	int idx;
	bool def, defmgmt;
};

static int nl80211_parse_key_new(struct nlattr *key, struct key_parse *k)
{
	struct nlattr *tb[NL80211_KEY_MAX + 1];
	int err = nla_parse_nested(tb, NL80211_KEY_MAX, key,
				   nl80211_key_policy);
	if (err)
		return err;

	k->def = !!tb[NL80211_KEY_DEFAULT];
	k->defmgmt = !!tb[NL80211_KEY_DEFAULT_MGMT];

	if (tb[NL80211_KEY_IDX])
		k->idx = nla_get_u8(tb[NL80211_KEY_IDX]);

	if (tb[NL80211_KEY_DATA]) {
		k->p.key = nla_data(tb[NL80211_KEY_DATA]);
		k->p.key_len = nla_len(tb[NL80211_KEY_DATA]);
	}

	if (tb[NL80211_KEY_SEQ]) {
		k->p.seq = nla_data(tb[NL80211_KEY_SEQ]);
		k->p.seq_len = nla_len(tb[NL80211_KEY_SEQ]);
	}

	if (tb[NL80211_KEY_CIPHER])
		k->p.cipher = nla_get_u32(tb[NL80211_KEY_CIPHER]);

	return 0;
}

static int nl80211_parse_key_old(struct genl_info *info, struct key_parse *k)
{
	if (info->attrs[NL80211_ATTR_KEY_DATA]) {
		k->p.key = nla_data(info->attrs[NL80211_ATTR_KEY_DATA]);
		k->p.key_len = nla_len(info->attrs[NL80211_ATTR_KEY_DATA]);
	}

	if (info->attrs[NL80211_ATTR_KEY_SEQ]) {
		k->p.seq = nla_data(info->attrs[NL80211_ATTR_KEY_SEQ]);
		k->p.seq_len = nla_len(info->attrs[NL80211_ATTR_KEY_SEQ]);
	}

	if (info->attrs[NL80211_ATTR_KEY_IDX])
		k->idx = nla_get_u8(info->attrs[NL80211_ATTR_KEY_IDX]);

	if (info->attrs[NL80211_ATTR_KEY_CIPHER])
		k->p.cipher = nla_get_u32(info->attrs[NL80211_ATTR_KEY_CIPHER]);

	k->def = !!info->attrs[NL80211_ATTR_KEY_DEFAULT];
	k->defmgmt = !!info->attrs[NL80211_ATTR_KEY_DEFAULT_MGMT];

	return 0;
}

static int nl80211_parse_key(struct genl_info *info, struct key_parse *k)
{
	int err;

	memset(k, 0, sizeof(*k));
	k->idx = -1;

	if (info->attrs[NL80211_ATTR_KEY])
		err = nl80211_parse_key_new(info->attrs[NL80211_ATTR_KEY], k);
	else
		err = nl80211_parse_key_old(info, k);

	if (err)
		return err;

	if (k->def && k->defmgmt)
		return -EINVAL;

	if (k->idx != -1) {
		if (k->defmgmt) {
			if (k->idx < 4 || k->idx > 5)
				return -EINVAL;
		} else if (k->def) {
			if (k->idx < 0 || k->idx > 3)
				return -EINVAL;
		} else {
			if (k->idx < 0 || k->idx > 5)
				return -EINVAL;
		}
	}

	return 0;
}

Johannes Berg's avatar
Johannes Berg committed
339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415
static struct cfg80211_cached_keys *
nl80211_parse_connkeys(struct cfg80211_registered_device *rdev,
		       struct nlattr *keys)
{
	struct key_parse parse;
	struct nlattr *key;
	struct cfg80211_cached_keys *result;
	int rem, err, def = 0;

	result = kzalloc(sizeof(*result), GFP_KERNEL);
	if (!result)
		return ERR_PTR(-ENOMEM);

	result->def = -1;
	result->defmgmt = -1;

	nla_for_each_nested(key, keys, rem) {
		memset(&parse, 0, sizeof(parse));
		parse.idx = -1;

		err = nl80211_parse_key_new(key, &parse);
		if (err)
			goto error;
		err = -EINVAL;
		if (!parse.p.key)
			goto error;
		if (parse.idx < 0 || parse.idx > 4)
			goto error;
		if (parse.def) {
			if (def)
				goto error;
			def = 1;
			result->def = parse.idx;
		} else if (parse.defmgmt)
			goto error;
		err = cfg80211_validate_key_settings(rdev, &parse.p,
						     parse.idx, NULL);
		if (err)
			goto error;
		result->params[parse.idx].cipher = parse.p.cipher;
		result->params[parse.idx].key_len = parse.p.key_len;
		result->params[parse.idx].key = result->data[parse.idx];
		memcpy(result->data[parse.idx], parse.p.key, parse.p.key_len);
	}

	return result;
 error:
	kfree(result);
	return ERR_PTR(err);
}

static int nl80211_key_allowed(struct wireless_dev *wdev)
{
	ASSERT_WDEV_LOCK(wdev);

	if (!netif_running(wdev->netdev))
		return -ENETDOWN;

	switch (wdev->iftype) {
	case NL80211_IFTYPE_AP:
	case NL80211_IFTYPE_AP_VLAN:
		break;
	case NL80211_IFTYPE_ADHOC:
		if (!wdev->current_bss)
			return -ENOLINK;
		break;
	case NL80211_IFTYPE_STATION:
		if (wdev->sme_state != CFG80211_SME_CONNECTED)
			return -ENOLINK;
		break;
	default:
		return -EINVAL;
	}

	return 0;
}

416 417 418 419
static int nl80211_send_wiphy(struct sk_buff *msg, u32 pid, u32 seq, int flags,
			      struct cfg80211_registered_device *dev)
{
	void *hdr;
420 421 422
	struct nlattr *nl_bands, *nl_band;
	struct nlattr *nl_freqs, *nl_freq;
	struct nlattr *nl_rates, *nl_rate;
423
	struct nlattr *nl_modes;
424
	struct nlattr *nl_cmds;
425 426 427 428
	enum ieee80211_band band;
	struct ieee80211_channel *chan;
	struct ieee80211_rate *rate;
	int i;
429
	u16 ifmodes = dev->wiphy.interface_modes;
430 431 432 433 434

	hdr = nl80211hdr_put(msg, pid, seq, flags, NL80211_CMD_NEW_WIPHY);
	if (!hdr)
		return -1;

435
	NLA_PUT_U32(msg, NL80211_ATTR_WIPHY, dev->wiphy_idx);
436
	NLA_PUT_STRING(msg, NL80211_ATTR_WIPHY_NAME, wiphy_name(&dev->wiphy));
437

438 439 440
	NLA_PUT_U32(msg, NL80211_ATTR_GENERATION,
		    cfg80211_rdev_list_generation);

441 442 443 444 445 446 447 448
	NLA_PUT_U8(msg, NL80211_ATTR_WIPHY_RETRY_SHORT,
		   dev->wiphy.retry_short);
	NLA_PUT_U8(msg, NL80211_ATTR_WIPHY_RETRY_LONG,
		   dev->wiphy.retry_long);
	NLA_PUT_U32(msg, NL80211_ATTR_WIPHY_FRAG_THRESHOLD,
		    dev->wiphy.frag_threshold);
	NLA_PUT_U32(msg, NL80211_ATTR_WIPHY_RTS_THRESHOLD,
		    dev->wiphy.rts_threshold);
449 450
	NLA_PUT_U8(msg, NL80211_ATTR_WIPHY_COVERAGE_CLASS,
		    dev->wiphy.coverage_class);
451

452 453
	NLA_PUT_U8(msg, NL80211_ATTR_MAX_NUM_SCAN_SSIDS,
		   dev->wiphy.max_scan_ssids);
454 455
	NLA_PUT_U16(msg, NL80211_ATTR_MAX_SCAN_IE_LEN,
		    dev->wiphy.max_scan_ie_len);
456

457 458 459 460
	NLA_PUT(msg, NL80211_ATTR_CIPHER_SUITES,
		sizeof(u32) * dev->wiphy.n_cipher_suites,
		dev->wiphy.cipher_suites);

Samuel Ortiz's avatar
Samuel Ortiz committed
461 462 463
	NLA_PUT_U8(msg, NL80211_ATTR_MAX_NUM_PMKIDS,
		   dev->wiphy.max_num_pmkids);

464 465 466 467 468 469 470 471 472 473 474 475 476 477
	nl_modes = nla_nest_start(msg, NL80211_ATTR_SUPPORTED_IFTYPES);
	if (!nl_modes)
		goto nla_put_failure;

	i = 0;
	while (ifmodes) {
		if (ifmodes & 1)
			NLA_PUT_FLAG(msg, i);
		ifmodes >>= 1;
		i++;
	}

	nla_nest_end(msg, nl_modes);

478 479 480 481 482 483 484 485 486 487 488 489
	nl_bands = nla_nest_start(msg, NL80211_ATTR_WIPHY_BANDS);
	if (!nl_bands)
		goto nla_put_failure;

	for (band = 0; band < IEEE80211_NUM_BANDS; band++) {
		if (!dev->wiphy.bands[band])
			continue;

		nl_band = nla_nest_start(msg, band);
		if (!nl_band)
			goto nla_put_failure;

490 491 492 493 494 495 496 497 498 499 500 501 502
		/* add HT info */
		if (dev->wiphy.bands[band]->ht_cap.ht_supported) {
			NLA_PUT(msg, NL80211_BAND_ATTR_HT_MCS_SET,
				sizeof(dev->wiphy.bands[band]->ht_cap.mcs),
				&dev->wiphy.bands[band]->ht_cap.mcs);
			NLA_PUT_U16(msg, NL80211_BAND_ATTR_HT_CAPA,
				dev->wiphy.bands[band]->ht_cap.cap);
			NLA_PUT_U8(msg, NL80211_BAND_ATTR_HT_AMPDU_FACTOR,
				dev->wiphy.bands[band]->ht_cap.ampdu_factor);
			NLA_PUT_U8(msg, NL80211_BAND_ATTR_HT_AMPDU_DENSITY,
				dev->wiphy.bands[band]->ht_cap.ampdu_density);
		}

503 504 505 506 507 508 509 510 511 512 513
		/* add frequencies */
		nl_freqs = nla_nest_start(msg, NL80211_BAND_ATTR_FREQS);
		if (!nl_freqs)
			goto nla_put_failure;

		for (i = 0; i < dev->wiphy.bands[band]->n_channels; i++) {
			nl_freq = nla_nest_start(msg, i);
			if (!nl_freq)
				goto nla_put_failure;

			chan = &dev->wiphy.bands[band]->channels[i];
514 515 516

			if (nl80211_msg_put_channel(msg, chan))
				goto nla_put_failure;
517

518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548
			nla_nest_end(msg, nl_freq);
		}

		nla_nest_end(msg, nl_freqs);

		/* add bitrates */
		nl_rates = nla_nest_start(msg, NL80211_BAND_ATTR_RATES);
		if (!nl_rates)
			goto nla_put_failure;

		for (i = 0; i < dev->wiphy.bands[band]->n_bitrates; i++) {
			nl_rate = nla_nest_start(msg, i);
			if (!nl_rate)
				goto nla_put_failure;

			rate = &dev->wiphy.bands[band]->bitrates[i];
			NLA_PUT_U32(msg, NL80211_BITRATE_ATTR_RATE,
				    rate->bitrate);
			if (rate->flags & IEEE80211_RATE_SHORT_PREAMBLE)
				NLA_PUT_FLAG(msg,
					NL80211_BITRATE_ATTR_2GHZ_SHORTPREAMBLE);

			nla_nest_end(msg, nl_rate);
		}

		nla_nest_end(msg, nl_rates);

		nla_nest_end(msg, nl_band);
	}
	nla_nest_end(msg, nl_bands);

549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569
	nl_cmds = nla_nest_start(msg, NL80211_ATTR_SUPPORTED_COMMANDS);
	if (!nl_cmds)
		goto nla_put_failure;

	i = 0;
#define CMD(op, n)						\
	 do {							\
		if (dev->ops->op) {				\
			i++;					\
			NLA_PUT_U32(msg, i, NL80211_CMD_ ## n);	\
		}						\
	} while (0)

	CMD(add_virtual_intf, NEW_INTERFACE);
	CMD(change_virtual_intf, SET_INTERFACE);
	CMD(add_key, NEW_KEY);
	CMD(add_beacon, NEW_BEACON);
	CMD(add_station, NEW_STATION);
	CMD(add_mpath, NEW_MPATH);
	CMD(set_mesh_params, SET_MESH_PARAMS);
	CMD(change_bss, SET_BSS);
570 571 572 573
	CMD(auth, AUTHENTICATE);
	CMD(assoc, ASSOCIATE);
	CMD(deauth, DEAUTHENTICATE);
	CMD(disassoc, DISASSOCIATE);
Johannes Berg's avatar
Johannes Berg committed
574
	CMD(join_ibss, JOIN_IBSS);
Samuel Ortiz's avatar
Samuel Ortiz committed
575 576 577
	CMD(set_pmksa, SET_PMKSA);
	CMD(del_pmksa, DEL_PMKSA);
	CMD(flush_pmksa, FLUSH_PMKSA);
578
	CMD(remain_on_channel, REMAIN_ON_CHANNEL);
579
	CMD(set_bitrate_mask, SET_TX_BITRATE_MASK);
580
	if (dev->wiphy.flags & WIPHY_FLAG_NETNS_OK) {
581 582 583
		i++;
		NLA_PUT_U32(msg, i, NL80211_CMD_SET_WIPHY_NETNS);
	}
584 585

#undef CMD
586

587
	if (dev->ops->connect || dev->ops->auth) {
588 589 590 591
		i++;
		NLA_PUT_U32(msg, i, NL80211_CMD_CONNECT);
	}

592
	if (dev->ops->disconnect || dev->ops->deauth) {
593 594 595 596
		i++;
		NLA_PUT_U32(msg, i, NL80211_CMD_DISCONNECT);
	}

597 598
	nla_nest_end(msg, nl_cmds);

599 600 601
	return genlmsg_end(msg, hdr);

 nla_put_failure:
602 603
	genlmsg_cancel(msg, hdr);
	return -EMSGSIZE;
604 605 606 607 608 609 610 611
}

static int nl80211_dump_wiphy(struct sk_buff *skb, struct netlink_callback *cb)
{
	int idx = 0;
	int start = cb->args[0];
	struct cfg80211_registered_device *dev;

612
	mutex_lock(&cfg80211_mutex);
613
	list_for_each_entry(dev, &cfg80211_rdev_list, list) {
614 615
		if (!net_eq(wiphy_net(&dev->wiphy), sock_net(skb->sk)))
			continue;
616
		if (++idx <= start)
617 618 619
			continue;
		if (nl80211_send_wiphy(skb, NETLINK_CB(cb->skb).pid,
				       cb->nlh->nlmsg_seq, NLM_F_MULTI,
620 621
				       dev) < 0) {
			idx--;
622
			break;
623
		}
624
	}
625
	mutex_unlock(&cfg80211_mutex);
626 627 628 629 630 631 632 633 634 635 636 637 638 639 640

	cb->args[0] = idx;

	return skb->len;
}

static int nl80211_get_wiphy(struct sk_buff *skb, struct genl_info *info)
{
	struct sk_buff *msg;
	struct cfg80211_registered_device *dev;

	dev = cfg80211_get_dev_from_info(info);
	if (IS_ERR(dev))
		return PTR_ERR(dev);

641
	msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
642 643 644 645 646 647
	if (!msg)
		goto out_err;

	if (nl80211_send_wiphy(msg, info->snd_pid, info->snd_seq, 0, dev) < 0)
		goto out_free;

648
	cfg80211_unlock_rdev(dev);
649

Johannes Berg's avatar
Johannes Berg committed
650
	return genlmsg_reply(msg, info);
651 652 653 654

 out_free:
	nlmsg_free(msg);
 out_err:
655
	cfg80211_unlock_rdev(dev);
656 657 658
	return -ENOBUFS;
}

659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683
static const struct nla_policy txq_params_policy[NL80211_TXQ_ATTR_MAX + 1] = {
	[NL80211_TXQ_ATTR_QUEUE]		= { .type = NLA_U8 },
	[NL80211_TXQ_ATTR_TXOP]			= { .type = NLA_U16 },
	[NL80211_TXQ_ATTR_CWMIN]		= { .type = NLA_U16 },
	[NL80211_TXQ_ATTR_CWMAX]		= { .type = NLA_U16 },
	[NL80211_TXQ_ATTR_AIFS]			= { .type = NLA_U8 },
};

static int parse_txq_params(struct nlattr *tb[],
			    struct ieee80211_txq_params *txq_params)
{
	if (!tb[NL80211_TXQ_ATTR_QUEUE] || !tb[NL80211_TXQ_ATTR_TXOP] ||
	    !tb[NL80211_TXQ_ATTR_CWMIN] || !tb[NL80211_TXQ_ATTR_CWMAX] ||
	    !tb[NL80211_TXQ_ATTR_AIFS])
		return -EINVAL;

	txq_params->queue = nla_get_u8(tb[NL80211_TXQ_ATTR_QUEUE]);
	txq_params->txop = nla_get_u16(tb[NL80211_TXQ_ATTR_TXOP]);
	txq_params->cwmin = nla_get_u16(tb[NL80211_TXQ_ATTR_CWMIN]);
	txq_params->cwmax = nla_get_u16(tb[NL80211_TXQ_ATTR_CWMAX]);
	txq_params->aifs = nla_get_u8(tb[NL80211_TXQ_ATTR_AIFS]);

	return 0;
}

684 685 686
static int nl80211_set_wiphy(struct sk_buff *skb, struct genl_info *info)
{
	struct cfg80211_registered_device *rdev;
687 688
	int result = 0, rem_txq_params = 0;
	struct nlattr *nl_txq_params;
689 690 691
	u32 changed;
	u8 retry_short = 0, retry_long = 0;
	u32 frag_threshold = 0, rts_threshold = 0;
692
	u8 coverage_class = 0;
693

694
	rtnl_lock();
695

696 697
	mutex_lock(&cfg80211_mutex);

698
	rdev = __cfg80211_rdev_from_info(info);
699
	if (IS_ERR(rdev)) {
700
		mutex_unlock(&cfg80211_mutex);
701 702 703 704 705 706 707
		result = PTR_ERR(rdev);
		goto unlock;
	}

	mutex_lock(&rdev->mtx);

	if (info->attrs[NL80211_ATTR_WIPHY_NAME])
708 709
		result = cfg80211_dev_rename(
			rdev, nla_data(info->attrs[NL80211_ATTR_WIPHY_NAME]));
710 711 712 713 714

	mutex_unlock(&cfg80211_mutex);

	if (result)
		goto bad_res;
715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741

	if (info->attrs[NL80211_ATTR_WIPHY_TXQ_PARAMS]) {
		struct ieee80211_txq_params txq_params;
		struct nlattr *tb[NL80211_TXQ_ATTR_MAX + 1];

		if (!rdev->ops->set_txq_params) {
			result = -EOPNOTSUPP;
			goto bad_res;
		}

		nla_for_each_nested(nl_txq_params,
				    info->attrs[NL80211_ATTR_WIPHY_TXQ_PARAMS],
				    rem_txq_params) {
			nla_parse(tb, NL80211_TXQ_ATTR_MAX,
				  nla_data(nl_txq_params),
				  nla_len(nl_txq_params),
				  txq_params_policy);
			result = parse_txq_params(tb, &txq_params);
			if (result)
				goto bad_res;

			result = rdev->ops->set_txq_params(&rdev->wiphy,
							   &txq_params);
			if (result)
				goto bad_res;
		}
	}
742

743
	if (info->attrs[NL80211_ATTR_WIPHY_FREQ]) {
Sujith's avatar
Sujith committed
744
		enum nl80211_channel_type channel_type = NL80211_CHAN_NO_HT;
745
		u32 freq;
746

747 748
		result = -EINVAL;

Sujith's avatar
Sujith committed
749 750 751 752 753 754 755
		if (info->attrs[NL80211_ATTR_WIPHY_CHANNEL_TYPE]) {
			channel_type = nla_get_u32(info->attrs[
					   NL80211_ATTR_WIPHY_CHANNEL_TYPE]);
			if (channel_type != NL80211_CHAN_NO_HT &&
			    channel_type != NL80211_CHAN_HT20 &&
			    channel_type != NL80211_CHAN_HT40PLUS &&
			    channel_type != NL80211_CHAN_HT40MINUS)
756 757 758 759
				goto bad_res;
		}

		freq = nla_get_u32(info->attrs[NL80211_ATTR_WIPHY_FREQ]);
760

761
		mutex_lock(&rdev->devlist_mtx);
762
		result = rdev_set_freq(rdev, NULL, freq, channel_type);
763
		mutex_unlock(&rdev->devlist_mtx);
764 765 766 767
		if (result)
			goto bad_res;
	}

768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814
	changed = 0;

	if (info->attrs[NL80211_ATTR_WIPHY_RETRY_SHORT]) {
		retry_short = nla_get_u8(
			info->attrs[NL80211_ATTR_WIPHY_RETRY_SHORT]);
		if (retry_short == 0) {
			result = -EINVAL;
			goto bad_res;
		}
		changed |= WIPHY_PARAM_RETRY_SHORT;
	}

	if (info->attrs[NL80211_ATTR_WIPHY_RETRY_LONG]) {
		retry_long = nla_get_u8(
			info->attrs[NL80211_ATTR_WIPHY_RETRY_LONG]);
		if (retry_long == 0) {
			result = -EINVAL;
			goto bad_res;
		}
		changed |= WIPHY_PARAM_RETRY_LONG;
	}

	if (info->attrs[NL80211_ATTR_WIPHY_FRAG_THRESHOLD]) {
		frag_threshold = nla_get_u32(
			info->attrs[NL80211_ATTR_WIPHY_FRAG_THRESHOLD]);
		if (frag_threshold < 256) {
			result = -EINVAL;
			goto bad_res;
		}
		if (frag_threshold != (u32) -1) {
			/*
			 * Fragments (apart from the last one) are required to
			 * have even length. Make the fragmentation code
			 * simpler by stripping LSB should someone try to use
			 * odd threshold value.
			 */
			frag_threshold &= ~0x1;
		}
		changed |= WIPHY_PARAM_FRAG_THRESHOLD;
	}

	if (info->attrs[NL80211_ATTR_WIPHY_RTS_THRESHOLD]) {
		rts_threshold = nla_get_u32(
			info->attrs[NL80211_ATTR_WIPHY_RTS_THRESHOLD]);
		changed |= WIPHY_PARAM_RTS_THRESHOLD;
	}

815 816 817 818 819 820
	if (info->attrs[NL80211_ATTR_WIPHY_COVERAGE_CLASS]) {
		coverage_class = nla_get_u8(
			info->attrs[NL80211_ATTR_WIPHY_COVERAGE_CLASS]);
		changed |= WIPHY_PARAM_COVERAGE_CLASS;
	}

821 822 823
	if (changed) {
		u8 old_retry_short, old_retry_long;
		u32 old_frag_threshold, old_rts_threshold;
824
		u8 old_coverage_class;
825 826 827 828 829 830 831 832 833 834

		if (!rdev->ops->set_wiphy_params) {
			result = -EOPNOTSUPP;
			goto bad_res;
		}

		old_retry_short = rdev->wiphy.retry_short;
		old_retry_long = rdev->wiphy.retry_long;
		old_frag_threshold = rdev->wiphy.frag_threshold;
		old_rts_threshold = rdev->wiphy.rts_threshold;
835
		old_coverage_class = rdev->wiphy.coverage_class;
836 837 838 839 840 841 842 843 844

		if (changed & WIPHY_PARAM_RETRY_SHORT)
			rdev->wiphy.retry_short = retry_short;
		if (changed & WIPHY_PARAM_RETRY_LONG)
			rdev->wiphy.retry_long = retry_long;
		if (changed & WIPHY_PARAM_FRAG_THRESHOLD)
			rdev->wiphy.frag_threshold = frag_threshold;
		if (changed & WIPHY_PARAM_RTS_THRESHOLD)
			rdev->wiphy.rts_threshold = rts_threshold;
845 846
		if (changed & WIPHY_PARAM_COVERAGE_CLASS)
			rdev->wiphy.coverage_class = coverage_class;
847 848 849 850 851 852 853

		result = rdev->ops->set_wiphy_params(&rdev->wiphy, changed);
		if (result) {
			rdev->wiphy.retry_short = old_retry_short;
			rdev->wiphy.retry_long = old_retry_long;
			rdev->wiphy.frag_threshold = old_frag_threshold;
			rdev->wiphy.rts_threshold = old_rts_threshold;
854
			rdev->wiphy.coverage_class = old_coverage_class;
855 856
		}
	}
857

858
 bad_res:
859 860 861
	mutex_unlock(&rdev->mtx);
 unlock:
	rtnl_unlock();
862 863 864 865 866
	return result;
}


static int nl80211_send_iface(struct sk_buff *msg, u32 pid, u32 seq, int flags,
867
			      struct cfg80211_registered_device *rdev,
868 869 870 871 872 873 874 875 876
			      struct net_device *dev)
{
	void *hdr;

	hdr = nl80211hdr_put(msg, pid, seq, flags, NL80211_CMD_NEW_INTERFACE);
	if (!hdr)
		return -1;

	NLA_PUT_U32(msg, NL80211_ATTR_IFINDEX, dev->ifindex);
877
	NLA_PUT_U32(msg, NL80211_ATTR_WIPHY, rdev->wiphy_idx);
878
	NLA_PUT_STRING(msg, NL80211_ATTR_IFNAME, dev->name);
Johannes Berg's avatar
Johannes Berg committed
879
	NLA_PUT_U32(msg, NL80211_ATTR_IFTYPE, dev->ieee80211_ptr->iftype);
880 881 882 883 884

	NLA_PUT_U32(msg, NL80211_ATTR_GENERATION,
		    rdev->devlist_generation ^
			(cfg80211_rdev_list_generation << 2));

885 886 887
	return genlmsg_end(msg, hdr);

 nla_put_failure:
888 889
	genlmsg_cancel(msg, hdr);
	return -EMSGSIZE;
890 891 892 893 894 895 896 897
}

static int nl80211_dump_interface(struct sk_buff *skb, struct netlink_callback *cb)
{
	int wp_idx = 0;
	int if_idx = 0;
	int wp_start = cb->args[0];
	int if_start = cb->args[1];
898
	struct cfg80211_registered_device *rdev;
899 900
	struct wireless_dev *wdev;

901
	mutex_lock(&cfg80211_mutex);
902 903
	list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
		if (!net_eq(wiphy_net(&rdev->wiphy), sock_net(skb->sk)))
904
			continue;
Johannes Berg's avatar
Johannes Berg committed
905 906
		if (wp_idx < wp_start) {
			wp_idx++;
907
			continue;
Johannes Berg's avatar
Johannes Berg committed
908
		}
909 910
		if_idx = 0;

911 912
		mutex_lock(&rdev->devlist_mtx);
		list_for_each_entry(wdev, &rdev->netdev_list, list) {
Johannes Berg's avatar
Johannes Berg committed
913 914
			if (if_idx < if_start) {
				if_idx++;
915
				continue;
Johannes Berg's avatar
Johannes Berg committed
916
			}
917 918
			if (nl80211_send_iface(skb, NETLINK_CB(cb->skb).pid,
					       cb->nlh->nlmsg_seq, NLM_F_MULTI,
919 920
					       rdev, wdev->netdev) < 0) {
				mutex_unlock(&rdev->devlist_mtx);
Johannes Berg's avatar
Johannes Berg committed
921 922 923
				goto out;
			}
			if_idx++;
924
		}
925
		mutex_unlock(&rdev->devlist_mtx);
Johannes Berg's avatar
Johannes Berg committed
926 927

		wp_idx++;
928
	}
Johannes Berg's avatar
Johannes Berg committed
929
 out:
930
	mutex_unlock(&cfg80211_mutex);
931 932 933 934 935 936 937 938 939 940 941 942 943 944

	cb->args[0] = wp_idx;
	cb->args[1] = if_idx;

	return skb->len;
}

static int nl80211_get_interface(struct sk_buff *skb, struct genl_info *info)
{
	struct sk_buff *msg;
	struct cfg80211_registered_device *dev;
	struct net_device *netdev;
	int err;

945
	err = get_rdev_dev_by_info_ifindex(info, &dev, &netdev);
946 947 948
	if (err)
		return err;

949
	msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
950 951 952
	if (!msg)
		goto out_err;

953 954
	if (nl80211_send_iface(msg, info->snd_pid, info->snd_seq, 0,
			       dev, netdev) < 0)
955 956 957
		goto out_free;

	dev_put(netdev);
958
	cfg80211_unlock_rdev(dev);
959

Johannes Berg's avatar
Johannes Berg committed
960
	return genlmsg_reply(msg, info);
961 962 963 964 965

 out_free:
	nlmsg_free(msg);
 out_err:
	dev_put(netdev);
966
	cfg80211_unlock_rdev(dev);
967 968 969
	return -ENOBUFS;
}

970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995 996 997 998
static const struct nla_policy mntr_flags_policy[NL80211_MNTR_FLAG_MAX + 1] = {
	[NL80211_MNTR_FLAG_FCSFAIL] = { .type = NLA_FLAG },
	[NL80211_MNTR_FLAG_PLCPFAIL] = { .type = NLA_FLAG },
	[NL80211_MNTR_FLAG_CONTROL] = { .type = NLA_FLAG },
	[NL80211_MNTR_FLAG_OTHER_BSS] = { .type = NLA_FLAG },
	[NL80211_MNTR_FLAG_COOK_FRAMES] = { .type = NLA_FLAG },
};

static int parse_monitor_flags(struct nlattr *nla, u32 *mntrflags)
{
	struct nlattr *flags[NL80211_MNTR_FLAG_MAX + 1];
	int flag;

	*mntrflags = 0;

	if (!nla)
		return -EINVAL;

	if (nla_parse_nested(flags, NL80211_MNTR_FLAG_MAX,
			     nla, mntr_flags_policy))
		return -EINVAL;

	for (flag = 1; flag <= NL80211_MNTR_FLAG_MAX; flag++)
		if (flags[flag])
			*mntrflags |= (1<<flag);

	return 0;
}

999
static int nl80211_valid_4addr(struct cfg80211_registered_device *rdev,
1000 1001
			       struct net_device *netdev, u8 use_4addr,
			       enum nl80211_iftype iftype)
1002
{
1003 1004 1005
	if (!use_4addr) {
		if (netdev && netdev->br_port)
			return -EBUSY;
1006
		return 0;
1007
	}
1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024

	switch (iftype) {
	case NL80211_IFTYPE_AP_VLAN:
		if (rdev->wiphy.flags & WIPHY_FLAG_4ADDR_AP)
			return 0;
		break;
	case NL80211_IFTYPE_STATION:
		if (rdev->wiphy.flags & WIPHY_FLAG_4ADDR_STATION)
			return 0;
		break;
	default:
		break;
	}

	return -EOPNOTSUPP;
}

1025 1026
static int nl80211_set_interface(struct sk_buff *skb, struct genl_info *info)
{
1027
	struct cfg80211_registered_device *rdev;
1028
	struct vif_params params;
1029
	int err;
Johannes Berg's avatar
Johannes Berg committed
1030
	enum nl80211_iftype otype, ntype;
1031
	struct net_device *dev;
1032
	u32 _flags, *flags = NULL;
1033
	bool change = false;
1034

1035 1036
	memset(&params, 0, sizeof(params));

Johannes Berg's avatar
Johannes Berg committed
1037 1038
	rtnl_lock();

1039
	err = get_rdev_dev_by_info_ifindex(info, &rdev, &dev);
1040
	if (err)
Johannes Berg's avatar
Johannes Berg committed
1041 1042
		goto unlock_rtnl;

Johannes Berg's avatar
Johannes Berg committed
1043
	otype = ntype = dev->ieee80211_ptr->iftype;
1044

1045
	if (info->attrs[NL80211_ATTR_IFTYPE]) {
1046
		ntype = nla_get_u32(info->attrs[NL80211_ATTR_IFTYPE]);
Johannes Berg's avatar
Johannes Berg committed
1047
		if (otype != ntype)
1048
			change = true;
Johannes Berg's avatar
Johannes Berg committed
1049
		if (ntype > NL80211_IFTYPE_MAX) {
1050
			err = -EINVAL;
1051
			goto unlock;
1052
		}
1053 1054
	}

1055
	if (info->attrs[NL80211_ATTR_MESH_ID]) {
Johannes Berg's avatar
Johannes Berg committed
1056
		if (ntype != NL80211_IFTYPE_MESH_POINT) {
1057 1058 1059
			err = -EINVAL;
			goto unlock;
		}
1060 1061
		params.mesh_id = nla_data(info->attrs[NL80211_ATTR_MESH_ID]);
		params.mesh_id_len = nla_len(info->attrs[NL80211_ATTR_MESH_ID]);
1062
		change = true;
1063 1064
	}

1065 1066 1067
	if (info->attrs[NL80211_ATTR_4ADDR]) {
		params.use_4addr = !!nla_get_u8(info->attrs[NL80211_ATTR_4ADDR]);
		change = true;
1068
		err = nl80211_valid_4addr(rdev, dev, params.use_4addr, ntype);
1069 1070
		if (err)
			goto unlock;
1071 1072 1073 1074
	} else {
		params.use_4addr = -1;
	}

1075
	if (info->attrs[NL80211_ATTR_MNTR_FLAGS]) {
Johannes Berg's avatar
Johannes Berg committed
1076
		if (ntype != NL80211_IFTYPE_MONITOR) {
1077 1078 1079 1080 1081
			err = -EINVAL;
			goto unlock;
		}
		err = parse_monitor_flags(info->attrs[NL80211_ATTR_MNTR_FLAGS],
					  &_flags);
1082 1083 1084 1085 1086
		if (err)
			goto unlock;

		flags = &_flags;
		change = true;
1087
	}
Johannes Berg's avatar
Johannes Berg committed
1088

1089
	if (change)
1090
		err = cfg80211_change_iface(rdev, dev, ntype, flags, &params);
1091 1092
	else
		err = 0;
Johannes Berg's avatar
Johannes Berg committed
1093

1094 1095 1096
	if (!err && params.use_4addr != -1)
		dev->ieee80211_ptr->use_4addr = params.use_4addr;

1097
 unlock:
1098
	dev_put(dev);
1099
	cfg80211_unlock_rdev(rdev);
Johannes Berg's avatar
Johannes Berg committed
1100 1101
 unlock_rtnl:
	rtnl_unlock();
1102 1103 1104 1105 1106
	return err;
}

static int nl80211_new_interface(struct sk_buff *skb, struct genl_info *info)
{
1107
	struct cfg80211_registered_device *rdev;
1108
	struct vif_params params;
1109 1110
	int err;
	enum nl80211_iftype type = NL80211_IFTYPE_UNSPECIFIED;
1111
	u32 flags;
1112

1113 1114
	memset(&params, 0, sizeof(params));

1115 1116 1117 1118 1119 1120 1121 1122 1123
	if (!info->attrs[NL80211_ATTR_IFNAME])
		return -EINVAL;

	if (info->attrs[NL80211_ATTR_IFTYPE]) {
		type = nla_get_u32(info->attrs[NL80211_ATTR_IFTYPE]);
		if (type > NL80211_IFTYPE_MAX)
			return -EINVAL;
	}

Johannes Berg's avatar
Johannes Berg committed
1124 1125
	rtnl_lock();

1126 1127 1128
	rdev = cfg80211_get_dev_from_info(info);
	if (IS_ERR(rdev)) {
		err = PTR_ERR(rdev);
Johannes Berg's avatar
Johannes Berg committed
1129 1130
		goto unlock_rtnl;
	}
1131

1132 1133
	if (!rdev->ops->add_virtual_intf ||
	    !(rdev->wiphy.interface_modes & (