nl80211.c 188 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 31
static bool nl80211_valid_auth_type(enum nl80211_auth_type auth_type);
static int nl80211_crypto_settings(struct cfg80211_registered_device *rdev,
				   struct genl_info *info,
				   struct cfg80211_crypto_settings *settings,
				   int cipher_limit);

32 33 34 35 36
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);

37 38 39 40 41 42 43
/* 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,
44
	.netnsok = true,
45 46
	.pre_doit = nl80211_pre_doit,
	.post_doit = nl80211_post_doit,
47 48
};

49
/* internal helper: get rdev and dev */
50
static int get_rdev_dev_by_info_ifindex(struct genl_info *info,
51
				       struct cfg80211_registered_device **rdev,
52 53
				       struct net_device **dev)
{
54
	struct nlattr **attrs = info->attrs;
55 56
	int ifindex;

Johannes Berg's avatar
Johannes Berg committed
57
	if (!attrs[NL80211_ATTR_IFINDEX])
58 59
		return -EINVAL;

Johannes Berg's avatar
Johannes Berg committed
60
	ifindex = nla_get_u32(attrs[NL80211_ATTR_IFINDEX]);
61
	*dev = dev_get_by_index(genl_info_net(info), ifindex);
62 63 64
	if (!*dev)
		return -ENODEV;

65
	*rdev = cfg80211_get_dev_from_ifindex(genl_info_net(info), ifindex);
66
	if (IS_ERR(*rdev)) {
67
		dev_put(*dev);
68
		return PTR_ERR(*rdev);
69 70 71 72 73 74
	}

	return 0;
}

/* policy for the attributes */
Alexey Dobriyan's avatar
Alexey Dobriyan committed
75
static const struct nla_policy nl80211_policy[NL80211_ATTR_MAX+1] = {
76 77
	[NL80211_ATTR_WIPHY] = { .type = NLA_U32 },
	[NL80211_ATTR_WIPHY_NAME] = { .type = NLA_NUL_STRING,
78
				      .len = 20-1 },
79
	[NL80211_ATTR_WIPHY_TXQ_PARAMS] = { .type = NLA_NESTED },
80
	[NL80211_ATTR_WIPHY_FREQ] = { .type = NLA_U32 },
Sujith's avatar
Sujith committed
81
	[NL80211_ATTR_WIPHY_CHANNEL_TYPE] = { .type = NLA_U32 },
82 83 84 85
	[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 },
86
	[NL80211_ATTR_WIPHY_COVERAGE_CLASS] = { .type = NLA_U8 },
87 88 89 90

	[NL80211_ATTR_IFTYPE] = { .type = NLA_U32 },
	[NL80211_ATTR_IFINDEX] = { .type = NLA_U32 },
	[NL80211_ATTR_IFNAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ-1 },
91 92

	[NL80211_ATTR_MAC] = { .type = NLA_BINARY, .len = ETH_ALEN },
93
	[NL80211_ATTR_PREV_BSSID] = { .type = NLA_BINARY, .len = ETH_ALEN },
94

95
	[NL80211_ATTR_KEY] = { .type = NLA_NESTED, },
96 97 98 99 100
	[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 },
101
	[NL80211_ATTR_KEY_SEQ] = { .type = NLA_BINARY, .len = 8 },
102
	[NL80211_ATTR_KEY_TYPE] = { .type = NLA_U32 },
103 104 105 106 107 108 109

	[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 },
110 111 112 113 114
	[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 },
115
	[NL80211_ATTR_STA_PLINK_ACTION] = { .type = NLA_U8 },
116
	[NL80211_ATTR_STA_VLAN] = { .type = NLA_U32 },
Johannes Berg's avatar
Johannes Berg committed
117
	[NL80211_ATTR_MNTR_FLAGS] = { /* NLA_NESTED can't be empty */ },
118 119 120
	[NL80211_ATTR_MESH_ID] = { .type = NLA_BINARY,
				.len = IEEE80211_MAX_MESH_ID_LEN },
	[NL80211_ATTR_MPATH_NEXT_HOP] = { .type = NLA_U32 },
121

122 123 124
	[NL80211_ATTR_REG_ALPHA2] = { .type = NLA_STRING, .len = 2 },
	[NL80211_ATTR_REG_RULES] = { .type = NLA_NESTED },

125 126 127
	[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 },
128 129
	[NL80211_ATTR_BSS_BASIC_RATES] = { .type = NLA_BINARY,
					   .len = NL80211_MAX_SUPP_RATES },
130
	[NL80211_ATTR_BSS_HT_OPMODE] = { .type = NLA_U16 },
131

132
	[NL80211_ATTR_MESH_CONFIG] = { .type = NLA_NESTED },
133
	[NL80211_ATTR_SUPPORT_MESH_AUTH] = { .type = NLA_FLAG },
134

135 136
	[NL80211_ATTR_HT_CAPABILITY] = { .type = NLA_BINARY,
					 .len = NL80211_HT_CAPABILITY_LEN },
137 138 139 140

	[NL80211_ATTR_MGMT_SUBTYPE] = { .type = NLA_U8 },
	[NL80211_ATTR_IE] = { .type = NLA_BINARY,
			      .len = IEEE80211_MAX_DATA_LEN },
141 142
	[NL80211_ATTR_SCAN_FREQUENCIES] = { .type = NLA_NESTED },
	[NL80211_ATTR_SCAN_SSIDS] = { .type = NLA_NESTED },
143 144 145 146 147

	[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
148
	[NL80211_ATTR_FREQ_FIXED] = { .type = NLA_FLAG },
149
	[NL80211_ATTR_TIMED_OUT] = { .type = NLA_FLAG },
150
	[NL80211_ATTR_USE_MFP] = { .type = NLA_U32 },
151 152 153
	[NL80211_ATTR_STA_FLAGS2] = {
		.len = sizeof(struct nl80211_sta_flag_update),
	},
154
	[NL80211_ATTR_CONTROL_PORT] = { .type = NLA_FLAG },
155 156
	[NL80211_ATTR_CONTROL_PORT_ETHERTYPE] = { .type = NLA_U16 },
	[NL80211_ATTR_CONTROL_PORT_NO_ENCRYPT] = { .type = NLA_FLAG },
157 158 159
	[NL80211_ATTR_PRIVACY] = { .type = NLA_FLAG },
	[NL80211_ATTR_CIPHER_SUITE_GROUP] = { .type = NLA_U32 },
	[NL80211_ATTR_WPA_VERSIONS] = { .type = NLA_U32 },
160
	[NL80211_ATTR_PID] = { .type = NLA_U32 },
161
	[NL80211_ATTR_4ADDR] = { .type = NLA_U8 },
Samuel Ortiz's avatar
Samuel Ortiz committed
162 163
	[NL80211_ATTR_PMKID] = { .type = NLA_BINARY,
				 .len = WLAN_PMKID_LEN },
164 165
	[NL80211_ATTR_DURATION] = { .type = NLA_U32 },
	[NL80211_ATTR_COOKIE] = { .type = NLA_U64 },
166
	[NL80211_ATTR_TX_RATES] = { .type = NLA_NESTED },
167 168 169
	[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
170
	[NL80211_ATTR_PS_STATE] = { .type = NLA_U32 },
171
	[NL80211_ATTR_CQM] = { .type = NLA_NESTED, },
172
	[NL80211_ATTR_LOCAL_STATE_CHANGE] = { .type = NLA_FLAG },
173
	[NL80211_ATTR_AP_ISOLATE] = { .type = NLA_U8 },
174 175
	[NL80211_ATTR_WIPHY_TX_POWER_SETTING] = { .type = NLA_U32 },
	[NL80211_ATTR_WIPHY_TX_POWER_LEVEL] = { .type = NLA_U32 },
176
	[NL80211_ATTR_FRAME_TYPE] = { .type = NLA_U16 },
177 178
	[NL80211_ATTR_WIPHY_ANTENNA_TX] = { .type = NLA_U32 },
	[NL80211_ATTR_WIPHY_ANTENNA_RX] = { .type = NLA_U32 },
179
	[NL80211_ATTR_MCAST_RATE] = { .type = NLA_U32 },
180
	[NL80211_ATTR_OFFCHANNEL_TX_OK] = { .type = NLA_FLAG },
181
	[NL80211_ATTR_KEY_DEFAULT_TYPES] = { .type = NLA_NESTED },
182
	[NL80211_ATTR_WOWLAN_TRIGGERS] = { .type = NLA_NESTED },
183
	[NL80211_ATTR_STA_PLINK_STATE] = { .type = NLA_U8 },
184
	[NL80211_ATTR_SCHED_SCAN_INTERVAL] = { .type = NLA_U32 },
185
	[NL80211_ATTR_REKEY_DATA] = { .type = NLA_NESTED },
186
	[NL80211_ATTR_SCAN_SUPP_RATES] = { .type = NLA_NESTED },
187
	[NL80211_ATTR_HIDDEN_SSID] = { .type = NLA_U32 },
188 189 190 191
	[NL80211_ATTR_IE_PROBE_RESP] = { .type = NLA_BINARY,
					 .len = IEEE80211_MAX_DATA_LEN },
	[NL80211_ATTR_IE_ASSOC_RESP] = { .type = NLA_BINARY,
					 .len = IEEE80211_MAX_DATA_LEN },
192
	[NL80211_ATTR_ROAM_SUPPORT] = { .type = NLA_FLAG },
193 194
};

195
/* policy for the key attributes */
Alexey Dobriyan's avatar
Alexey Dobriyan committed
196
static const struct nla_policy nl80211_key_policy[NL80211_KEY_MAX + 1] = {
Johannes Berg's avatar
Johannes Berg committed
197
	[NL80211_KEY_DATA] = { .type = NLA_BINARY, .len = WLAN_MAX_KEY_LEN },
198 199 200 201 202
	[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 },
203
	[NL80211_KEY_TYPE] = { .type = NLA_U32 },
204 205 206 207 208 209 210 211
	[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 },
212 213
};

214 215 216 217 218 219 220
/* 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 },
221 222 223 224
	[NL80211_WOWLAN_TRIG_GTK_REKEY_FAILURE] = { .type = NLA_FLAG },
	[NL80211_WOWLAN_TRIG_EAP_IDENT_REQUEST] = { .type = NLA_FLAG },
	[NL80211_WOWLAN_TRIG_4WAY_HANDSHAKE] = { .type = NLA_FLAG },
	[NL80211_WOWLAN_TRIG_RFKILL_RELEASE] = { .type = NLA_FLAG },
225 226
};

227 228 229 230 231 232 233 234
/* 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 },
};

235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254
/* 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;
}

255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278
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);
279 280
	if (IS_ERR(*rdev)) {
		err = PTR_ERR(*rdev);
281 282 283 284 285 286 287 288 289 290 291 292 293 294 295
		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();
}

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
/* 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;
}

326 327 328 329 330 331 332 333
/* 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);
}

334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357
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;
}

358 359
/* netlink command implementations */

360 361 362
struct key_parse {
	struct key_params p;
	int idx;
363
	int type;
364
	bool def, defmgmt;
365
	bool def_uni, def_multi;
366 367 368 369 370 371 372 373 374 375 376 377 378
};

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];

379 380 381 382 383 384 385
	if (k->def) {
		k->def_uni = true;
		k->def_multi = true;
	}
	if (k->defmgmt)
		k->def_multi = true;

386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401
	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]);

402 403 404 405 406 407
	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;
	}

408 409 410 411 412 413 414 415 416 417 418 419 420
	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];
	}

421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444
	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];

445 446 447 448 449 450 451
	if (k->def) {
		k->def_uni = true;
		k->def_multi = true;
	}
	if (k->defmgmt)
		k->def_multi = true;

452 453 454 455 456 457
	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;
	}

458 459 460 461 462 463 464 465 466 467 468 469 470
	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];
	}

471 472 473 474 475 476 477 478 479
	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;
480
	k->type = -1;
481 482 483 484 485 486 487 488 489 490 491 492

	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;

493 494 495 496 497
	if (k->defmgmt) {
		if (k->def_uni || !k->def_multi)
			return -EINVAL;
	}

498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513
	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
514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546
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;
547 548
			if (!parse.def_uni || !parse.def_multi)
				goto error;
Johannes Berg's avatar
Johannes Berg committed
549 550 551
		} else if (parse.defmgmt)
			goto error;
		err = cfg80211_validate_key_settings(rdev, &parse.p,
552
						     parse.idx, false, NULL);
Johannes Berg's avatar
Johannes Berg committed
553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573
		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:
574
	case NL80211_IFTYPE_P2P_GO:
575
	case NL80211_IFTYPE_MESH_POINT:
Johannes Berg's avatar
Johannes Berg committed
576 577 578 579 580 581
		break;
	case NL80211_IFTYPE_ADHOC:
		if (!wdev->current_bss)
			return -ENOLINK;
		break;
	case NL80211_IFTYPE_STATION:
582
	case NL80211_IFTYPE_P2P_CLIENT:
Johannes Berg's avatar
Johannes Berg committed
583 584 585 586 587 588 589 590 591 592
		if (wdev->sme_state != CFG80211_SME_CONNECTED)
			return -ENOLINK;
		break;
	default:
		return -EINVAL;
	}

	return 0;
}

593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674
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;
}

675 676 677 678
static int nl80211_send_wiphy(struct sk_buff *msg, u32 pid, u32 seq, int flags,
			      struct cfg80211_registered_device *dev)
{
	void *hdr;
679 680 681
	struct nlattr *nl_bands, *nl_band;
	struct nlattr *nl_freqs, *nl_freq;
	struct nlattr *nl_rates, *nl_rate;
682
	struct nlattr *nl_cmds;
683 684 685 686
	enum ieee80211_band band;
	struct ieee80211_channel *chan;
	struct ieee80211_rate *rate;
	int i;
687 688
	const struct ieee80211_txrx_stypes *mgmt_stypes =
				dev->wiphy.mgmt_stypes;
689 690 691 692 693

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

694
	NLA_PUT_U32(msg, NL80211_ATTR_WIPHY, dev->wiphy_idx);
695
	NLA_PUT_STRING(msg, NL80211_ATTR_WIPHY_NAME, wiphy_name(&dev->wiphy));
696

697 698 699
	NLA_PUT_U32(msg, NL80211_ATTR_GENERATION,
		    cfg80211_rdev_list_generation);

700 701 702 703 704 705 706 707
	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);
708 709
	NLA_PUT_U8(msg, NL80211_ATTR_WIPHY_COVERAGE_CLASS,
		    dev->wiphy.coverage_class);
710 711
	NLA_PUT_U8(msg, NL80211_ATTR_MAX_NUM_SCAN_SSIDS,
		   dev->wiphy.max_scan_ssids);
712 713
	NLA_PUT_U8(msg, NL80211_ATTR_MAX_NUM_SCHED_SCAN_SSIDS,
		   dev->wiphy.max_sched_scan_ssids);
714 715
	NLA_PUT_U16(msg, NL80211_ATTR_MAX_SCAN_IE_LEN,
		    dev->wiphy.max_scan_ie_len);
716 717
	NLA_PUT_U16(msg, NL80211_ATTR_MAX_SCHED_SCAN_IE_LEN,
		    dev->wiphy.max_sched_scan_ie_len);
718

719 720
	if (dev->wiphy.flags & WIPHY_FLAG_IBSS_RSN)
		NLA_PUT_FLAG(msg, NL80211_ATTR_SUPPORT_IBSS_RSN);
721 722
	if (dev->wiphy.flags & WIPHY_FLAG_MESH_AUTH)
		NLA_PUT_FLAG(msg, NL80211_ATTR_SUPPORT_MESH_AUTH);
723 724
	if (dev->wiphy.flags & WIPHY_FLAG_AP_UAPSD)
		NLA_PUT_FLAG(msg, NL80211_ATTR_SUPPORT_AP_UAPSD);
725

726 727 728
	if (dev->wiphy.flags & WIPHY_FLAG_SUPPORTS_FW_ROAM)
		NLA_PUT_FLAG(msg, NL80211_ATTR_ROAM_SUPPORT);

729 730 731 732
	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
733 734 735
	NLA_PUT_U8(msg, NL80211_ATTR_MAX_NUM_PMKIDS,
		   dev->wiphy.max_num_pmkids);

736 737 738
	if (dev->wiphy.flags & WIPHY_FLAG_CONTROL_PORT_PROTOCOL)
		NLA_PUT_FLAG(msg, NL80211_ATTR_CONTROL_PORT_ETHERTYPE);

739 740 741 742 743
	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);

744 745
	if ((dev->wiphy.available_antennas_tx ||
	     dev->wiphy.available_antennas_rx) && dev->ops->get_antenna) {
746 747 748 749 750 751 752 753 754
		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);
		}
	}

755 756
	if (nl80211_put_iftypes(msg, NL80211_ATTR_SUPPORTED_IFTYPES,
				dev->wiphy.interface_modes))
757 758
		goto nla_put_failure;

759 760 761 762 763 764 765 766 767 768 769 770
	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;

771 772 773 774 775 776 777 778 779 780 781 782 783
		/* 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);
		}

784 785 786 787 788 789 790 791 792 793 794
		/* 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];
795 796 797

			if (nl80211_msg_put_channel(msg, chan))
				goto nla_put_failure;
798

799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829
			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);

830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848
	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);
849
	CMD(update_mesh_config, SET_MESH_CONFIG);
850
	CMD(change_bss, SET_BSS);
851 852 853 854
	CMD(auth, AUTHENTICATE);
	CMD(assoc, ASSOCIATE);
	CMD(deauth, DEAUTHENTICATE);
	CMD(disassoc, DISASSOCIATE);
Johannes Berg's avatar
Johannes Berg committed
855
	CMD(join_ibss, JOIN_IBSS);
856
	CMD(join_mesh, JOIN_MESH);
Samuel Ortiz's avatar
Samuel Ortiz committed
857 858 859
	CMD(set_pmksa, SET_PMKSA);
	CMD(del_pmksa, DEL_PMKSA);
	CMD(flush_pmksa, FLUSH_PMKSA);
860
	CMD(remain_on_channel, REMAIN_ON_CHANNEL);
861
	CMD(set_bitrate_mask, SET_TX_BITRATE_MASK);
862
	CMD(mgmt_tx, FRAME);
863
	CMD(mgmt_tx_cancel_wait, FRAME_WAIT_CANCEL);
864
	if (dev->wiphy.flags & WIPHY_FLAG_NETNS_OK) {
865 866 867
		i++;
		NLA_PUT_U32(msg, i, NL80211_CMD_SET_WIPHY_NETNS);
	}
868
	CMD(set_channel, SET_CHANNEL);
869
	CMD(set_wds_peer, SET_WDS_PEER);
870 871
	if (dev->wiphy.flags & WIPHY_FLAG_SUPPORTS_SCHED_SCAN)
		CMD(sched_scan_start, START_SCHED_SCAN);
872 873

#undef CMD
874

875
	if (dev->ops->connect || dev->ops->auth) {
876 877 878 879
		i++;
		NLA_PUT_U32(msg, i, NL80211_CMD_CONNECT);
	}

880
	if (dev->ops->disconnect || dev->ops->deauth) {
881 882 883 884
		i++;
		NLA_PUT_U32(msg, i, NL80211_CMD_DISCONNECT);
	}

885 886
	nla_nest_end(msg, nl_cmds);

887 888 889 890
	if (dev->ops->remain_on_channel)
		NLA_PUT_U32(msg, NL80211_ATTR_MAX_REMAIN_ON_CHANNEL_DURATION,
			    dev->wiphy.max_remain_on_channel_duration);

891
	if (dev->ops->mgmt_tx_cancel_wait)
892 893
		NLA_PUT_FLAG(msg, NL80211_ATTR_OFFCHANNEL_TX_OK);

894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918
	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
919 920
		nla_nest_end(msg, nl_ifs);

921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 942
		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);
	}

943 944 945 946 947 948 949 950 951 952 953 954 955 956
	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);
957 958 959 960 961 962 963 964 965 966
		if (dev->wiphy.wowlan.flags & WIPHY_WOWLAN_SUPPORTS_GTK_REKEY)
			NLA_PUT_FLAG(msg, NL80211_WOWLAN_TRIG_GTK_REKEY_SUPPORTED);
		if (dev->wiphy.wowlan.flags & WIPHY_WOWLAN_GTK_REKEY_FAILURE)
			NLA_PUT_FLAG(msg, NL80211_WOWLAN_TRIG_GTK_REKEY_FAILURE);
		if (dev->wiphy.wowlan.flags & WIPHY_WOWLAN_EAP_IDENTITY_REQ)
			NLA_PUT_FLAG(msg, NL80211_WOWLAN_TRIG_EAP_IDENT_REQUEST);
		if (dev->wiphy.wowlan.flags & WIPHY_WOWLAN_4WAY_HANDSHAKE)
			NLA_PUT_FLAG(msg, NL80211_WOWLAN_TRIG_4WAY_HANDSHAKE);
		if (dev->wiphy.wowlan.flags & WIPHY_WOWLAN_RFKILL_RELEASE)
			NLA_PUT_FLAG(msg, NL80211_WOWLAN_TRIG_RFKILL_RELEASE);
967 968 969 970 971 972 973 974 975 976 977 978 979 980 981
		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);
	}

982 983 984 985 986 987 988
	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;

989 990 991
	return genlmsg_end(msg, hdr);

 nla_put_failure:
992 993
	genlmsg_cancel(msg, hdr);
	return -EMSGSIZE;
994 995 996 997 998 999 1000 1001
}

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;

1002
	mutex_lock(&cfg80211_mutex);
1003
	list_for_each_entry(dev, &cfg80211_rdev_list, list) {
1004 1005
		if (!net_eq(wiphy_net(&dev->wiphy), sock_net(skb->sk)))
			continue;
1006
		if (++idx <= start)
1007 1008 1009
			continue;
		if (nl80211_send_wiphy(skb, NETLINK_CB(cb->skb).pid,
				       cb->nlh->nlmsg_seq, NLM_F_MULTI,
1010 1011
				       dev) < 0) {
			idx--;
1012
			break;
1013
		}
1014
	}
1015
	mutex_unlock(&cfg80211_mutex);
1016 1017 1018 1019 1020 1021 1022 1023 1024

	cb->args[0] = idx;

	return skb->len;
}

static int nl80211_get_wiphy(struct sk_buff *skb, struct genl_info *info)
{
	struct sk_buff *msg;
1025
	struct cfg80211_registered_device *dev = info->user_ptr[0];
1026

1027
	msg = nlmsg_new(NLMSG_DEFAULT_SIZE, GFP_KERNEL);
1028
	if (!msg)
1029
		return -ENOMEM;
1030

1031 1032 1033 1034
	if (nl80211_send_wiphy(msg, info->snd_pid, info->snd_seq, 0, dev) < 0) {
		nlmsg_free(msg);
		return -ENOBUFS;
	}
1035

Johannes Berg's avatar
Johannes Berg committed
1036
	return genlmsg_reply(msg, info);
1037 1038
}

1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063
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;
}

1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079
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 ||
1080 1081
		wdev->iftype == NL80211_IFTYPE_MONITOR ||
		wdev->iftype == NL80211_IFTYPE_P2P_GO;
1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124
}

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)
{
1125 1126
	struct cfg80211_registered_device *rdev = info->user_ptr[0];
	struct net_device *netdev = info->user_ptr[1];
1127

1128
	return __nl80211_set_channel(rdev, netdev->ieee80211_ptr, info);
1129 1130
}

1131 1132
static int nl80211_set_wds_peer(struct sk_buff *skb, struct genl_info *info)
{
1133 1134 1135
	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
1136
	const u8 *bssid;
1137 1138 1139 1140

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

1141 1142
	if (netif_running(dev))
		return -EBUSY;
1143

1144 1145
	if (!rdev->ops->set_wds_peer)
		return -EOPNOTSUPP;
1146

1147 1148
	if (wdev->iftype != NL80211_IFTYPE_WDS)
		return -EOPNOTSUPP;
1149 1150

	bssid = nla_data(info->attrs[NL80211_ATTR_MAC]);
1151
	return rdev->ops->set_wds_peer(wdev->wiphy, dev, bssid);
1152 1153 1154
}


1155 1156 1157
static int nl80211_set_wiphy(struct sk_buff *skb, struct genl_info *info)
{
	struct cfg80211_registered_device *rdev;
1158 1159
	struct net_device *netdev = NULL;
	struct wireless_dev *wdev;
Bill Jordan's avatar
Bill Jordan committed
1160
	int result = 0, rem_txq_params = 0;
1161
	struct nlattr *nl_txq_params;
1162 1163 1164
	u32 changed;
	u8 retry_short = 0, retry_long = 0;
	u32 frag_threshold = 0, rts_threshold = 0;
1165
	u8 coverage_class = 0;
1166

1167 1168 1169 1170 1171 1172 1173 1174 1175
	/*
	 * 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!
	 */
1176 1177
	mutex_lock(&cfg80211_mutex);

1178 1179 1180 1181 1182 1183 1184 1185 1186
	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;
1187 1188
	}

1189 1190 1191 1192
	if (!netdev) {
		rdev = __cfg80211_rdev_from_info(info);
		if (IS_ERR(rdev)) {
			mutex_unlock(&cfg80211_mutex);