nl80211.c 181 KB
Newer Older
1 2 3
/*
 * This is the new netlink-based wireless configuration interface.
 *
4
 * Copyright 2006-2010	Johannes Berg <johannes@sipsolutions.net>
5 6 7 8 9
 */

#include <linux/if.h>
#include <linux/module.h>
#include <linux/err.h>
10
#include <linux/slab.h>
11 12 13 14 15 16
#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>
17
#include <linux/etherdevice.h>
18
#include <net/net_namespace.h>
19 20
#include <net/genetlink.h>
#include <net/cfg80211.h>
21
#include <net/sock.h>
22 23
#include "core.h"
#include "nl80211.h"
24
#include "reg.h"
25

26 27 28 29 30
static int nl80211_pre_doit(struct genl_ops *ops, struct sk_buff *skb,
			    struct genl_info *info);
static void nl80211_post_doit(struct genl_ops *ops, struct sk_buff *skb,
			      struct genl_info *info);

31 32 33 34 35 36 37
/* 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,
38
	.netnsok = true,
39 40
	.pre_doit = nl80211_pre_doit,
	.post_doit = nl80211_post_doit,
41 42
};

43
/* internal helper: get rdev and dev */
44
static int get_rdev_dev_by_info_ifindex(struct genl_info *info,
45
				       struct cfg80211_registered_device **rdev,
46 47
				       struct net_device **dev)
{
48
	struct nlattr **attrs = info->attrs;
49 50
	int ifindex;

Johannes Berg's avatar
Johannes Berg committed
51
	if (!attrs[NL80211_ATTR_IFINDEX])
52 53
		return -EINVAL;

Johannes Berg's avatar
Johannes Berg committed
54
	ifindex = nla_get_u32(attrs[NL80211_ATTR_IFINDEX]);
55
	*dev = dev_get_by_index(genl_info_net(info), ifindex);
56 57 58
	if (!*dev)
		return -ENODEV;

59
	*rdev = cfg80211_get_dev_from_ifindex(genl_info_net(info), ifindex);
60
	if (IS_ERR(*rdev)) {
61
		dev_put(*dev);
62
		return PTR_ERR(*rdev);
63 64 65 66 67 68
	}

	return 0;
}

/* policy for the attributes */
Alexey Dobriyan's avatar
Alexey Dobriyan committed
69
static const struct nla_policy nl80211_policy[NL80211_ATTR_MAX+1] = {
70 71
	[NL80211_ATTR_WIPHY] = { .type = NLA_U32 },
	[NL80211_ATTR_WIPHY_NAME] = { .type = NLA_NUL_STRING,
72
				      .len = 20-1 },
73
	[NL80211_ATTR_WIPHY_TXQ_PARAMS] = { .type = NLA_NESTED },
74
	[NL80211_ATTR_WIPHY_FREQ] = { .type = NLA_U32 },
Sujith's avatar
Sujith committed
75
	[NL80211_ATTR_WIPHY_CHANNEL_TYPE] = { .type = NLA_U32 },
76 77 78 79
	[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 },
80
	[NL80211_ATTR_WIPHY_COVERAGE_CLASS] = { .type = NLA_U8 },
81 82 83 84

	[NL80211_ATTR_IFTYPE] = { .type = NLA_U32 },
	[NL80211_ATTR_IFINDEX] = { .type = NLA_U32 },
	[NL80211_ATTR_IFNAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ-1 },
85 86

	[NL80211_ATTR_MAC] = { .type = NLA_BINARY, .len = ETH_ALEN },
87
	[NL80211_ATTR_PREV_BSSID] = { .type = NLA_BINARY, .len = ETH_ALEN },
88

89
	[NL80211_ATTR_KEY] = { .type = NLA_NESTED, },
90 91 92 93 94
	[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 },
95
	[NL80211_ATTR_KEY_SEQ] = { .type = NLA_BINARY, .len = 8 },
96
	[NL80211_ATTR_KEY_TYPE] = { .type = NLA_U32 },
97 98 99 100 101 102 103

	[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 },
104 105 106 107 108
	[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 },
109
	[NL80211_ATTR_STA_PLINK_ACTION] = { .type = NLA_U8 },
110
	[NL80211_ATTR_STA_VLAN] = { .type = NLA_U32 },
Johannes Berg's avatar
Johannes Berg committed
111
	[NL80211_ATTR_MNTR_FLAGS] = { /* NLA_NESTED can't be empty */ },
112 113 114
	[NL80211_ATTR_MESH_ID] = { .type = NLA_BINARY,
				.len = IEEE80211_MAX_MESH_ID_LEN },
	[NL80211_ATTR_MPATH_NEXT_HOP] = { .type = NLA_U32 },
115

116 117 118
	[NL80211_ATTR_REG_ALPHA2] = { .type = NLA_STRING, .len = 2 },
	[NL80211_ATTR_REG_RULES] = { .type = NLA_NESTED },

119 120 121
	[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 },
122 123
	[NL80211_ATTR_BSS_BASIC_RATES] = { .type = NLA_BINARY,
					   .len = NL80211_MAX_SUPP_RATES },
124
	[NL80211_ATTR_BSS_HT_OPMODE] = { .type = NLA_U16 },
125

126
	[NL80211_ATTR_MESH_CONFIG] = { .type = NLA_NESTED },
127
	[NL80211_ATTR_SUPPORT_MESH_AUTH] = { .type = NLA_FLAG },
128

129 130
	[NL80211_ATTR_HT_CAPABILITY] = { .type = NLA_BINARY,
					 .len = NL80211_HT_CAPABILITY_LEN },
131 132 133 134

	[NL80211_ATTR_MGMT_SUBTYPE] = { .type = NLA_U8 },
	[NL80211_ATTR_IE] = { .type = NLA_BINARY,
			      .len = IEEE80211_MAX_DATA_LEN },
135 136
	[NL80211_ATTR_SCAN_FREQUENCIES] = { .type = NLA_NESTED },
	[NL80211_ATTR_SCAN_SSIDS] = { .type = NLA_NESTED },
137 138 139 140 141

	[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
142
	[NL80211_ATTR_FREQ_FIXED] = { .type = NLA_FLAG },
143
	[NL80211_ATTR_TIMED_OUT] = { .type = NLA_FLAG },
144
	[NL80211_ATTR_USE_MFP] = { .type = NLA_U32 },
145 146 147
	[NL80211_ATTR_STA_FLAGS2] = {
		.len = sizeof(struct nl80211_sta_flag_update),
	},
148
	[NL80211_ATTR_CONTROL_PORT] = { .type = NLA_FLAG },
149 150
	[NL80211_ATTR_CONTROL_PORT_ETHERTYPE] = { .type = NLA_U16 },
	[NL80211_ATTR_CONTROL_PORT_NO_ENCRYPT] = { .type = NLA_FLAG },
151 152 153
	[NL80211_ATTR_PRIVACY] = { .type = NLA_FLAG },
	[NL80211_ATTR_CIPHER_SUITE_GROUP] = { .type = NLA_U32 },
	[NL80211_ATTR_WPA_VERSIONS] = { .type = NLA_U32 },
154
	[NL80211_ATTR_PID] = { .type = NLA_U32 },
155
	[NL80211_ATTR_4ADDR] = { .type = NLA_U8 },
Samuel Ortiz's avatar
Samuel Ortiz committed
156 157
	[NL80211_ATTR_PMKID] = { .type = NLA_BINARY,
				 .len = WLAN_PMKID_LEN },
158 159
	[NL80211_ATTR_DURATION] = { .type = NLA_U32 },
	[NL80211_ATTR_COOKIE] = { .type = NLA_U64 },
160
	[NL80211_ATTR_TX_RATES] = { .type = NLA_NESTED },
161 162 163
	[NL80211_ATTR_FRAME] = { .type = NLA_BINARY,
				 .len = IEEE80211_MAX_DATA_LEN },
	[NL80211_ATTR_FRAME_MATCH] = { .type = NLA_BINARY, },
Kalle Valo's avatar
Kalle Valo committed
164
	[NL80211_ATTR_PS_STATE] = { .type = NLA_U32 },
165
	[NL80211_ATTR_CQM] = { .type = NLA_NESTED, },
166
	[NL80211_ATTR_LOCAL_STATE_CHANGE] = { .type = NLA_FLAG },
167
	[NL80211_ATTR_AP_ISOLATE] = { .type = NLA_U8 },
168 169
	[NL80211_ATTR_WIPHY_TX_POWER_SETTING] = { .type = NLA_U32 },
	[NL80211_ATTR_WIPHY_TX_POWER_LEVEL] = { .type = NLA_U32 },
170
	[NL80211_ATTR_FRAME_TYPE] = { .type = NLA_U16 },
171 172
	[NL80211_ATTR_WIPHY_ANTENNA_TX] = { .type = NLA_U32 },
	[NL80211_ATTR_WIPHY_ANTENNA_RX] = { .type = NLA_U32 },
173
	[NL80211_ATTR_MCAST_RATE] = { .type = NLA_U32 },
174
	[NL80211_ATTR_OFFCHANNEL_TX_OK] = { .type = NLA_FLAG },
175
	[NL80211_ATTR_KEY_DEFAULT_TYPES] = { .type = NLA_NESTED },
176
	[NL80211_ATTR_WOWLAN_TRIGGERS] = { .type = NLA_NESTED },
177
	[NL80211_ATTR_STA_PLINK_STATE] = { .type = NLA_U8 },
178
	[NL80211_ATTR_SCHED_SCAN_INTERVAL] = { .type = NLA_U32 },
179
	[NL80211_ATTR_REKEY_DATA] = { .type = NLA_NESTED },
180 181
};

182
/* policy for the key attributes */
Alexey Dobriyan's avatar
Alexey Dobriyan committed
183
static const struct nla_policy nl80211_key_policy[NL80211_KEY_MAX + 1] = {
Johannes Berg's avatar
Johannes Berg committed
184
	[NL80211_KEY_DATA] = { .type = NLA_BINARY, .len = WLAN_MAX_KEY_LEN },
185 186 187 188 189
	[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 },
190
	[NL80211_KEY_TYPE] = { .type = NLA_U32 },
191 192 193 194 195 196 197 198
	[NL80211_KEY_DEFAULT_TYPES] = { .type = NLA_NESTED },
};

/* policy for the key default flags */
static const struct nla_policy
nl80211_key_default_policy[NUM_NL80211_KEY_DEFAULT_TYPES] = {
	[NL80211_KEY_DEFAULT_TYPE_UNICAST] = { .type = NLA_FLAG },
	[NL80211_KEY_DEFAULT_TYPE_MULTICAST] = { .type = NLA_FLAG },
199 200
};

201 202 203 204 205 206 207 208 209
/* policy for WoWLAN attributes */
static const struct nla_policy
nl80211_wowlan_policy[NUM_NL80211_WOWLAN_TRIG] = {
	[NL80211_WOWLAN_TRIG_ANY] = { .type = NLA_FLAG },
	[NL80211_WOWLAN_TRIG_DISCONNECT] = { .type = NLA_FLAG },
	[NL80211_WOWLAN_TRIG_MAGIC_PKT] = { .type = NLA_FLAG },
	[NL80211_WOWLAN_TRIG_PKT_PATTERN] = { .type = NLA_NESTED },
};

210 211 212 213 214 215 216 217
/* policy for GTK rekey offload attributes */
static const struct nla_policy
nl80211_rekey_policy[NUM_NL80211_REKEY_DATA] = {
	[NL80211_REKEY_DATA_KEK] = { .len = NL80211_KEK_LEN },
	[NL80211_REKEY_DATA_KCK] = { .len = NL80211_KCK_LEN },
	[NL80211_REKEY_DATA_REPLAY_CTR] = { .len = NL80211_REPLAY_CTR_LEN },
};

218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237
/* 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;
}

238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261
static int nl80211_prepare_netdev_dump(struct sk_buff *skb,
				       struct netlink_callback *cb,
				       struct cfg80211_registered_device **rdev,
				       struct net_device **dev)
{
	int ifidx = cb->args[0];
	int err;

	if (!ifidx)
		ifidx = nl80211_get_ifidx(cb);
	if (ifidx < 0)
		return ifidx;

	cb->args[0] = ifidx;

	rtnl_lock();

	*dev = __dev_get_by_index(sock_net(skb->sk), ifidx);
	if (!*dev) {
		err = -ENODEV;
		goto out_rtnl;
	}

	*rdev = cfg80211_get_dev_from_ifindex(sock_net(skb->sk), ifidx);
262 263
	if (IS_ERR(*rdev)) {
		err = PTR_ERR(*rdev);
264 265 266 267 268 269 270 271 272 273 274 275 276 277 278
		goto out_rtnl;
	}

	return 0;
 out_rtnl:
	rtnl_unlock();
	return err;
}

static void nl80211_finish_netdev_dump(struct cfg80211_registered_device *rdev)
{
	cfg80211_unlock_rdev(rdev);
	rtnl_unlock();
}

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
/* 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;
}

309 310 311 312 313 314 315 316
/* 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);
}

317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340
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;
}

341 342
/* netlink command implementations */

343 344 345
struct key_parse {
	struct key_params p;
	int idx;
346
	int type;
347
	bool def, defmgmt;
348
	bool def_uni, def_multi;
349 350 351 352 353 354 355 356 357 358 359 360 361
};

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];

362 363 364 365 366 367 368
	if (k->def) {
		k->def_uni = true;
		k->def_multi = true;
	}
	if (k->defmgmt)
		k->def_multi = true;

369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384
	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]);

385 386 387 388 389 390
	if (tb[NL80211_KEY_TYPE]) {
		k->type = nla_get_u32(tb[NL80211_KEY_TYPE]);
		if (k->type < 0 || k->type >= NUM_NL80211_KEYTYPES)
			return -EINVAL;
	}

391 392 393 394 395 396 397 398 399 400 401 402 403
	if (tb[NL80211_KEY_DEFAULT_TYPES]) {
		struct nlattr *kdt[NUM_NL80211_KEY_DEFAULT_TYPES];
		int err = nla_parse_nested(kdt,
					   NUM_NL80211_KEY_DEFAULT_TYPES - 1,
					   tb[NL80211_KEY_DEFAULT_TYPES],
					   nl80211_key_default_policy);
		if (err)
			return err;

		k->def_uni = kdt[NL80211_KEY_DEFAULT_TYPE_UNICAST];
		k->def_multi = kdt[NL80211_KEY_DEFAULT_TYPE_MULTICAST];
	}

404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427
	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];

428 429 430 431 432 433 434
	if (k->def) {
		k->def_uni = true;
		k->def_multi = true;
	}
	if (k->defmgmt)
		k->def_multi = true;

435 436 437 438 439 440
	if (info->attrs[NL80211_ATTR_KEY_TYPE]) {
		k->type = nla_get_u32(info->attrs[NL80211_ATTR_KEY_TYPE]);
		if (k->type < 0 || k->type >= NUM_NL80211_KEYTYPES)
			return -EINVAL;
	}

441 442 443 444 445 446 447 448 449 450 451 452 453
	if (info->attrs[NL80211_ATTR_KEY_DEFAULT_TYPES]) {
		struct nlattr *kdt[NUM_NL80211_KEY_DEFAULT_TYPES];
		int err = nla_parse_nested(
				kdt, NUM_NL80211_KEY_DEFAULT_TYPES - 1,
				info->attrs[NL80211_ATTR_KEY_DEFAULT_TYPES],
				nl80211_key_default_policy);
		if (err)
			return err;

		k->def_uni = kdt[NL80211_KEY_DEFAULT_TYPE_UNICAST];
		k->def_multi = kdt[NL80211_KEY_DEFAULT_TYPE_MULTICAST];
	}

454 455 456 457 458 459 460 461 462
	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;
463
	k->type = -1;
464 465 466 467 468 469 470 471 472 473 474 475

	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;

476 477 478 479 480
	if (k->defmgmt) {
		if (k->def_uni || !k->def_multi)
			return -EINVAL;
	}

481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496
	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
497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529
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;
530 531
			if (!parse.def_uni || !parse.def_multi)
				goto error;
Johannes Berg's avatar
Johannes Berg committed
532 533 534
		} else if (parse.defmgmt)
			goto error;
		err = cfg80211_validate_key_settings(rdev, &parse.p,
535
						     parse.idx, false, NULL);
Johannes Berg's avatar
Johannes Berg committed
536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556
		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);

	switch (wdev->iftype) {
	case NL80211_IFTYPE_AP:
	case NL80211_IFTYPE_AP_VLAN:
557
	case NL80211_IFTYPE_P2P_GO:
558
	case NL80211_IFTYPE_MESH_POINT:
Johannes Berg's avatar
Johannes Berg committed
559 560 561 562 563 564
		break;
	case NL80211_IFTYPE_ADHOC:
		if (!wdev->current_bss)
			return -ENOLINK;
		break;
	case NL80211_IFTYPE_STATION:
565
	case NL80211_IFTYPE_P2P_CLIENT:
Johannes Berg's avatar
Johannes Berg committed
566 567 568 569 570 571 572 573 574 575
		if (wdev->sme_state != CFG80211_SME_CONNECTED)
			return -ENOLINK;
		break;
	default:
		return -EINVAL;
	}

	return 0;
}

576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657
static int nl80211_put_iftypes(struct sk_buff *msg, u32 attr, u16 ifmodes)
{
	struct nlattr *nl_modes = nla_nest_start(msg, attr);
	int i;

	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);
	return 0;

nla_put_failure:
	return -ENOBUFS;
}

static int nl80211_put_iface_combinations(struct wiphy *wiphy,
					  struct sk_buff *msg)
{
	struct nlattr *nl_combis;
	int i, j;

	nl_combis = nla_nest_start(msg,
				NL80211_ATTR_INTERFACE_COMBINATIONS);
	if (!nl_combis)
		goto nla_put_failure;

	for (i = 0; i < wiphy->n_iface_combinations; i++) {
		const struct ieee80211_iface_combination *c;
		struct nlattr *nl_combi, *nl_limits;

		c = &wiphy->iface_combinations[i];

		nl_combi = nla_nest_start(msg, i + 1);
		if (!nl_combi)
			goto nla_put_failure;

		nl_limits = nla_nest_start(msg, NL80211_IFACE_COMB_LIMITS);
		if (!nl_limits)
			goto nla_put_failure;

		for (j = 0; j < c->n_limits; j++) {
			struct nlattr *nl_limit;

			nl_limit = nla_nest_start(msg, j + 1);
			if (!nl_limit)
				goto nla_put_failure;
			NLA_PUT_U32(msg, NL80211_IFACE_LIMIT_MAX,
				    c->limits[j].max);
			if (nl80211_put_iftypes(msg, NL80211_IFACE_LIMIT_TYPES,
						c->limits[j].types))
				goto nla_put_failure;
			nla_nest_end(msg, nl_limit);
		}

		nla_nest_end(msg, nl_limits);

		if (c->beacon_int_infra_match)
			NLA_PUT_FLAG(msg,
				NL80211_IFACE_COMB_STA_AP_BI_MATCH);
		NLA_PUT_U32(msg, NL80211_IFACE_COMB_NUM_CHANNELS,
			    c->num_different_channels);
		NLA_PUT_U32(msg, NL80211_IFACE_COMB_MAXNUM,
			    c->max_interfaces);

		nla_nest_end(msg, nl_combi);
	}

	nla_nest_end(msg, nl_combis);

	return 0;
nla_put_failure:
	return -ENOBUFS;
}

658 659 660 661
static int nl80211_send_wiphy(struct sk_buff *msg, u32 pid, u32 seq, int flags,
			      struct cfg80211_registered_device *dev)
{
	void *hdr;
662 663 664
	struct nlattr *nl_bands, *nl_band;
	struct nlattr *nl_freqs, *nl_freq;
	struct nlattr *nl_rates, *nl_rate;
665
	struct nlattr *nl_cmds;
666 667 668 669
	enum ieee80211_band band;
	struct ieee80211_channel *chan;
	struct ieee80211_rate *rate;
	int i;
670 671
	const struct ieee80211_txrx_stypes *mgmt_stypes =
				dev->wiphy.mgmt_stypes;
672 673 674 675 676

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

677
	NLA_PUT_U32(msg, NL80211_ATTR_WIPHY, dev->wiphy_idx);
678
	NLA_PUT_STRING(msg, NL80211_ATTR_WIPHY_NAME, wiphy_name(&dev->wiphy));
679

680 681 682
	NLA_PUT_U32(msg, NL80211_ATTR_GENERATION,
		    cfg80211_rdev_list_generation);

683 684 685 686 687 688 689 690
	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);
691 692
	NLA_PUT_U8(msg, NL80211_ATTR_WIPHY_COVERAGE_CLASS,
		    dev->wiphy.coverage_class);
693 694
	NLA_PUT_U8(msg, NL80211_ATTR_MAX_NUM_SCAN_SSIDS,
		   dev->wiphy.max_scan_ssids);
695 696
	NLA_PUT_U16(msg, NL80211_ATTR_MAX_SCAN_IE_LEN,
		    dev->wiphy.max_scan_ie_len);
697

698 699
	if (dev->wiphy.flags & WIPHY_FLAG_IBSS_RSN)
		NLA_PUT_FLAG(msg, NL80211_ATTR_SUPPORT_IBSS_RSN);
700 701
	if (dev->wiphy.flags & WIPHY_FLAG_MESH_AUTH)
		NLA_PUT_FLAG(msg, NL80211_ATTR_SUPPORT_MESH_AUTH);
702

703 704 705 706
	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
707 708 709
	NLA_PUT_U8(msg, NL80211_ATTR_MAX_NUM_PMKIDS,
		   dev->wiphy.max_num_pmkids);

710 711 712
	if (dev->wiphy.flags & WIPHY_FLAG_CONTROL_PORT_PROTOCOL)
		NLA_PUT_FLAG(msg, NL80211_ATTR_CONTROL_PORT_ETHERTYPE);

713 714 715 716 717
	NLA_PUT_U32(msg, NL80211_ATTR_WIPHY_ANTENNA_AVAIL_TX,
		    dev->wiphy.available_antennas_tx);
	NLA_PUT_U32(msg, NL80211_ATTR_WIPHY_ANTENNA_AVAIL_RX,
		    dev->wiphy.available_antennas_rx);

718 719
	if ((dev->wiphy.available_antennas_tx ||
	     dev->wiphy.available_antennas_rx) && dev->ops->get_antenna) {
720 721 722 723 724 725 726 727 728
		u32 tx_ant = 0, rx_ant = 0;
		int res;
		res = dev->ops->get_antenna(&dev->wiphy, &tx_ant, &rx_ant);
		if (!res) {
			NLA_PUT_U32(msg, NL80211_ATTR_WIPHY_ANTENNA_TX, tx_ant);
			NLA_PUT_U32(msg, NL80211_ATTR_WIPHY_ANTENNA_RX, rx_ant);
		}
	}

729 730
	if (nl80211_put_iftypes(msg, NL80211_ATTR_SUPPORTED_IFTYPES,
				dev->wiphy.interface_modes))
731 732
		goto nla_put_failure;

733 734 735 736 737 738 739 740 741 742 743 744
	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;

745 746 747 748 749 750 751 752 753 754 755 756 757
		/* 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);
		}

758 759 760 761 762 763 764 765 766 767 768
		/* 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];
769 770 771

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

804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822
	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);
823
	CMD(update_mesh_config, SET_MESH_CONFIG);
824
	CMD(change_bss, SET_BSS);
825 826 827 828
	CMD(auth, AUTHENTICATE);
	CMD(assoc, ASSOCIATE);
	CMD(deauth, DEAUTHENTICATE);
	CMD(disassoc, DISASSOCIATE);
Johannes Berg's avatar
Johannes Berg committed
829
	CMD(join_ibss, JOIN_IBSS);
830
	CMD(join_mesh, JOIN_MESH);
Samuel Ortiz's avatar
Samuel Ortiz committed
831 832 833
	CMD(set_pmksa, SET_PMKSA);
	CMD(del_pmksa, DEL_PMKSA);
	CMD(flush_pmksa, FLUSH_PMKSA);
834
	CMD(remain_on_channel, REMAIN_ON_CHANNEL);
835
	CMD(set_bitrate_mask, SET_TX_BITRATE_MASK);
836
	CMD(mgmt_tx, FRAME);
837
	CMD(mgmt_tx_cancel_wait, FRAME_WAIT_CANCEL);
838
	if (dev->wiphy.flags & WIPHY_FLAG_NETNS_OK) {
839 840 841
		i++;
		NLA_PUT_U32(msg, i, NL80211_CMD_SET_WIPHY_NETNS);
	}
842
	CMD(set_channel, SET_CHANNEL);
843
	CMD(set_wds_peer, SET_WDS_PEER);
844 845
	if (dev->wiphy.flags & WIPHY_FLAG_SUPPORTS_SCHED_SCAN)
		CMD(sched_scan_start, START_SCHED_SCAN);
846 847

#undef CMD
848

849
	if (dev->ops->connect || dev->ops->auth) {
850 851 852 853
		i++;
		NLA_PUT_U32(msg, i, NL80211_CMD_CONNECT);
	}

854
	if (dev->ops->disconnect || dev->ops->deauth) {
855 856 857 858
		i++;
		NLA_PUT_U32(msg, i, NL80211_CMD_DISCONNECT);
	}

859 860
	nla_nest_end(msg, nl_cmds);

861 862 863 864
	if (dev->ops->remain_on_channel)
		NLA_PUT_U32(msg, NL80211_ATTR_MAX_REMAIN_ON_CHANNEL_DURATION,
			    dev->wiphy.max_remain_on_channel_duration);

865 866 867 868
	/* for now at least assume all drivers have it */
	if (dev->ops->mgmt_tx)
		NLA_PUT_FLAG(msg, NL80211_ATTR_OFFCHANNEL_TX_OK);

869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893
	if (mgmt_stypes) {
		u16 stypes;
		struct nlattr *nl_ftypes, *nl_ifs;
		enum nl80211_iftype ift;

		nl_ifs = nla_nest_start(msg, NL80211_ATTR_TX_FRAME_TYPES);
		if (!nl_ifs)
			goto nla_put_failure;

		for (ift = 0; ift < NUM_NL80211_IFTYPES; ift++) {
			nl_ftypes = nla_nest_start(msg, ift);
			if (!nl_ftypes)
				goto nla_put_failure;
			i = 0;
			stypes = mgmt_stypes[ift].tx;
			while (stypes) {
				if (stypes & 1)
					NLA_PUT_U16(msg, NL80211_ATTR_FRAME_TYPE,
						    (i << 4) | IEEE80211_FTYPE_MGMT);
				stypes >>= 1;
				i++;
			}
			nla_nest_end(msg, nl_ftypes);
		}

Johannes Berg's avatar
Johannes Berg committed
894 895
		nla_nest_end(msg, nl_ifs);

896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917
		nl_ifs = nla_nest_start(msg, NL80211_ATTR_RX_FRAME_TYPES);
		if (!nl_ifs)
			goto nla_put_failure;

		for (ift = 0; ift < NUM_NL80211_IFTYPES; ift++) {
			nl_ftypes = nla_nest_start(msg, ift);
			if (!nl_ftypes)
				goto nla_put_failure;
			i = 0;
			stypes = mgmt_stypes[ift].rx;
			while (stypes) {
				if (stypes & 1)
					NLA_PUT_U16(msg, NL80211_ATTR_FRAME_TYPE,
						    (i << 4) | IEEE80211_FTYPE_MGMT);
				stypes >>= 1;
				i++;
			}
			nla_nest_end(msg, nl_ftypes);
		}
		nla_nest_end(msg, nl_ifs);
	}

918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942 943 944 945 946
	if (dev->wiphy.wowlan.flags || dev->wiphy.wowlan.n_patterns) {
		struct nlattr *nl_wowlan;

		nl_wowlan = nla_nest_start(msg,
				NL80211_ATTR_WOWLAN_TRIGGERS_SUPPORTED);
		if (!nl_wowlan)
			goto nla_put_failure;

		if (dev->wiphy.wowlan.flags & WIPHY_WOWLAN_ANY)
			NLA_PUT_FLAG(msg, NL80211_WOWLAN_TRIG_ANY);
		if (dev->wiphy.wowlan.flags & WIPHY_WOWLAN_DISCONNECT)
			NLA_PUT_FLAG(msg, NL80211_WOWLAN_TRIG_DISCONNECT);
		if (dev->wiphy.wowlan.flags & WIPHY_WOWLAN_MAGIC_PKT)
			NLA_PUT_FLAG(msg, NL80211_WOWLAN_TRIG_MAGIC_PKT);
		if (dev->wiphy.wowlan.n_patterns) {
			struct nl80211_wowlan_pattern_support pat = {
				.max_patterns = dev->wiphy.wowlan.n_patterns,
				.min_pattern_len =
					dev->wiphy.wowlan.pattern_min_len,
				.max_pattern_len =
					dev->wiphy.wowlan.pattern_max_len,
			};
			NLA_PUT(msg, NL80211_WOWLAN_TRIG_PKT_PATTERN,
				sizeof(pat), &pat);
		}

		nla_nest_end(msg, nl_wowlan);
	}

947 948 949 950 951 952 953
	if (nl80211_put_iftypes(msg, NL80211_ATTR_SOFTWARE_IFTYPES,
				dev->wiphy.software_iftypes))
		goto nla_put_failure;

	if (nl80211_put_iface_combinations(&dev->wiphy, msg))
		goto nla_put_failure;

954 955 956
	return genlmsg_end(msg, hdr);

 nla_put_failure:
957 958
	genlmsg_cancel(msg, hdr);
	return -EMSGSIZE;
959 960 961 962 963 964 965 966
}

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;

967
	mutex_lock(&cfg80211_mutex);
968
	list_for_each_entry(dev, &cfg80211_rdev_list, list) {
969 970
		if (!net_eq(wiphy_net(&dev->wiphy), sock_net(skb->sk)))
			continue;
971
		if (++idx <= start)
972 973 974
			continue;
		if (nl80211_send_wiphy(skb, NETLINK_CB(cb->skb).pid,
				       cb->nlh->nlmsg_seq, NLM_F_MULTI,
975 976
				       dev) < 0) {
			idx--;
977
			break;
978
		}
979
	}
980
	mutex_unlock(&cfg80211_mutex);
981 982 983 984 985 986 987 988 989

	cb->args[0] = idx;

	return skb->len;
}

static int nl80211_get_wiphy(struct sk_buff *skb, struct genl_info *info)
{
	struct sk_buff *msg;
990
	struct cfg80211_registered_device *dev = info->user_ptr[0];
991

992
	msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
993
	if (!msg)
994
		return -ENOMEM;
995

996 997 998 999
	if (nl80211_send_wiphy(msg, info->snd_pid, info->snd_seq, 0, dev) < 0) {
		nlmsg_free(msg);
		return -ENOBUFS;
	}
1000

Johannes Berg's avatar
Johannes Berg committed
1001
	return genlmsg_reply(msg, info);
1002 1003
}

1004 1005 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028
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;
}

1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 1040 1041 1042 1043 1044
static bool nl80211_can_set_dev_channel(struct wireless_dev *wdev)
{
	/*
	 * You can only set the channel explicitly for AP, mesh
	 * and WDS type interfaces; all others have their channel
	 * managed via their respective "establish a connection"
	 * command (connect, join, ...)
	 *
	 * Monitors are special as they are normally slaved to
	 * whatever else is going on, so they behave as though
	 * you tried setting the wiphy channel itself.
	 */
	return !wdev ||
		wdev->iftype == NL80211_IFTYPE_AP ||
		wdev->iftype == NL80211_IFTYPE_WDS ||
		wdev->iftype == NL80211_IFTYPE_MESH_POINT ||
1045 1046
		wdev->iftype == NL80211_IFTYPE_MONITOR ||
		wdev->iftype == NL80211_IFTYPE_P2P_GO;
1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089
}

static int __nl80211_set_channel(struct cfg80211_registered_device *rdev,
				 struct wireless_dev *wdev,
				 struct genl_info *info)
{
	enum nl80211_channel_type channel_type = NL80211_CHAN_NO_HT;
	u32 freq;
	int result;

	if (!info->attrs[NL80211_ATTR_WIPHY_FREQ])
		return -EINVAL;

	if (!nl80211_can_set_dev_channel(wdev))
		return -EOPNOTSUPP;

	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)
			return -EINVAL;
	}

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

	mutex_lock(&rdev->devlist_mtx);
	if (wdev) {
		wdev_lock(wdev);
		result = cfg80211_set_freq(rdev, wdev, freq, channel_type);
		wdev_unlock(wdev);
	} else {
		result = cfg80211_set_freq(rdev, NULL, freq, channel_type);
	}
	mutex_unlock(&rdev->devlist_mtx);

	return result;
}

static int nl80211_set_channel(struct sk_buff *skb, struct genl_info *info)
{
1090 1091
	struct cfg80211_registered_device *rdev = info->user_ptr[0];
	struct net_device *netdev = info->user_ptr[1];
1092

1093
	return __nl80211_set_channel(rdev, netdev->ieee80211_ptr, info);
1094 1095
}

1096 1097
static int nl80211_set_wds_peer(struct sk_buff *skb, struct genl_info *info)
{
1098 1099 1100
	struct cfg80211_registered_device *rdev = info->user_ptr[0];
	struct net_device *dev = info->user_ptr[1];
	struct wireless_dev *wdev = dev->ieee80211_ptr;
Johannes Berg's avatar
Johannes Berg committed
1101
	const u8 *bssid;
1102 1103 1104 1105

	if (!info->attrs[NL80211_ATTR_MAC])
		return -EINVAL;

1106 1107
	if (netif_running(dev))
		return -EBUSY;
1108

1109 1110
	if (!rdev->ops->set_wds_peer)
		return -EOPNOTSUPP;
1111

1112 1113
	if (wdev->iftype != NL80211_IFTYPE_WDS)
		return -EOPNOTSUPP;
1114 1115

	bssid = nla_data(info->attrs[NL80211_ATTR_MAC]);
1116
	return rdev->ops->set_wds_peer(wdev->wiphy, dev, bssid);
1117 1118 1119
}


1120 1121 1122
static int nl80211_set_wiphy(struct sk_buff *skb, struct genl_info *info)
{
	struct cfg80211_registered_device *rdev;
1123 1124
	struct net_device *netdev = NULL;
	struct wireless_dev *wdev;
Bill Jordan's avatar
Bill Jordan committed
1125
	int result = 0, rem_txq_params = 0;
1126
	struct nlattr *nl_txq_params;
1127 1128 1129
	u32 changed;
	u8 retry_short = 0, retry_long = 0;
	u32 frag_threshold = 0, rts_threshold = 0;
1130
	u8 coverage_class = 0;
1131

1132 1133 1134 1135 1136 1137 1138 1139 1140
	/*
	 * Try to find the wiphy and netdev. Normally this
	 * function shouldn't need the netdev, but this is
	 * done for backward compatibility -- previously
	 * setting the channel was done per wiphy, but now
	 * it is per netdev. Previous userland like hostapd
	 * also passed a netdev to set_wiphy, so that it is
	 * possible to let that go to the right netdev!
	 */
1141 1142
	mutex_lock(&cfg80211_mutex);

1143 1144 1145 1146 1147 1148 1149 1150 1151
	if (info->attrs[NL80211_ATTR_IFINDEX]) {
		int ifindex = nla_get_u32(info->attrs[NL80211_ATTR_IFINDEX]);

		netdev = dev_get_by_index(genl_info_net(info), ifindex);
		if (netdev && netdev->ieee80211_ptr) {
			rdev = wiphy_to_dev(netdev->ieee80211_ptr->wiphy);
			mutex_lock(&rdev->mtx);
		} else
			netdev = NULL;
1152 1153
	}

1154 1155 1156 1157
	if (!netdev) {
		rdev = __cfg80211_rdev_from_info(info);
		if (IS_ERR(rdev)) {
			mutex_unlock(&cfg80211_mutex);
1158
			return PTR_ERR(rdev);
1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174
		}
		wdev = NULL;
		netdev = NULL;
		result = 0;

		mutex_lock(&rdev->mtx);
	} else if (netif_running(netdev) &&
		   nl80211_can_set_dev_channel(netdev->ieee80211_ptr))
		wdev = netdev->ieee80211_ptr;
	else
		wdev = NULL;

	/*
	 * end workaround code, by now the rdev is available
	 * and locked, and wdev may or may not be NULL.
	 */
1175 1176

	if (info->attrs[NL80211_ATTR_WIPHY_NAME])
1177 1178
		result = cfg80211_dev_rename(
			rdev, nla_data(info->attrs[NL80211_ATTR_WIPHY_NAME]));
1179 1180 1181 1182 1183

	mutex_unlock(&cfg80211_mutex);

	if (result)
		goto bad_res;
1184 1185 1186 1187 1188 1189 1190 1191 1192 1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210

	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;
		}
	}
1211

1212
	if (info->attrs[NL80211_ATTR_WIPHY_FREQ]) {
1213
		result = __nl80211_set_channel(rdev, wdev, info);
1214 1215 1216 1217