nl80211.c 360 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
 * Copyright 2013-2014  Intel Mobile Communications GmbH
Beni Lev's avatar
Beni Lev committed
6
 * Copyright 2015-2016	Intel Deutschland GmbH
7 8 9 10 11
 */

#include <linux/if.h>
#include <linux/module.h>
#include <linux/err.h>
12
#include <linux/slab.h>
13 14 15 16 17 18
#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>
19
#include <linux/etherdevice.h>
20
#include <net/net_namespace.h>
21 22
#include <net/genetlink.h>
#include <net/cfg80211.h>
23
#include <net/sock.h>
24
#include <net/inet_connection_sock.h>
25 26
#include "core.h"
#include "nl80211.h"
27
#include "reg.h"
28
#include "rdev-ops.h"
29

30 31 32 33 34
static int nl80211_crypto_settings(struct cfg80211_registered_device *rdev,
				   struct genl_info *info,
				   struct cfg80211_crypto_settings *settings,
				   int cipher_limit);

35
static int nl80211_pre_doit(const struct genl_ops *ops, struct sk_buff *skb,
36
			    struct genl_info *info);
37
static void nl80211_post_doit(const struct genl_ops *ops, struct sk_buff *skb,
38 39
			      struct genl_info *info);

40 41
/* the netlink family */
static struct genl_family nl80211_fam = {
42 43 44 45
	.id = GENL_ID_GENERATE,		/* don't bother with a hardcoded ID */
	.name = NL80211_GENL_NAME,	/* have users key off the name instead */
	.hdrsize = 0,			/* no private header */
	.version = 1,			/* no particular meaning now */
46
	.maxattr = NL80211_ATTR_MAX,
47
	.netnsok = true,
48 49
	.pre_doit = nl80211_pre_doit,
	.post_doit = nl80211_post_doit,
50 51
};

52 53 54 55 56 57
/* multicast groups */
enum nl80211_multicast_groups {
	NL80211_MCGRP_CONFIG,
	NL80211_MCGRP_SCAN,
	NL80211_MCGRP_REGULATORY,
	NL80211_MCGRP_MLME,
58
	NL80211_MCGRP_VENDOR,
59 60 61 62
	NL80211_MCGRP_TESTMODE /* keep last - ifdef! */
};

static const struct genl_multicast_group nl80211_mcgrps[] = {
63 64 65 66 67
	[NL80211_MCGRP_CONFIG] = { .name = NL80211_MULTICAST_GROUP_CONFIG },
	[NL80211_MCGRP_SCAN] = { .name = NL80211_MULTICAST_GROUP_SCAN },
	[NL80211_MCGRP_REGULATORY] = { .name = NL80211_MULTICAST_GROUP_REG },
	[NL80211_MCGRP_MLME] = { .name = NL80211_MULTICAST_GROUP_MLME },
	[NL80211_MCGRP_VENDOR] = { .name = NL80211_MULTICAST_GROUP_VENDOR },
68
#ifdef CONFIG_NL80211_TESTMODE
69
	[NL80211_MCGRP_TESTMODE] = { .name = NL80211_MULTICAST_GROUP_TESTMODE }
70 71 72
#endif
};

73 74 75
/* returns ERR_PTR values */
static struct wireless_dev *
__cfg80211_wdev_from_attrs(struct net *netns, struct nlattr **attrs)
76
{
77 78 79 80 81 82 83
	struct cfg80211_registered_device *rdev;
	struct wireless_dev *result = NULL;
	bool have_ifidx = attrs[NL80211_ATTR_IFINDEX];
	bool have_wdev_id = attrs[NL80211_ATTR_WDEV];
	u64 wdev_id;
	int wiphy_idx = -1;
	int ifidx = -1;
84

85
	ASSERT_RTNL();
86

87 88
	if (!have_ifidx && !have_wdev_id)
		return ERR_PTR(-EINVAL);
89

90 91 92 93 94
	if (have_ifidx)
		ifidx = nla_get_u32(attrs[NL80211_ATTR_IFINDEX]);
	if (have_wdev_id) {
		wdev_id = nla_get_u64(attrs[NL80211_ATTR_WDEV]);
		wiphy_idx = wdev_id >> 32;
95 96
	}

97 98 99 100 101 102 103 104 105
	list_for_each_entry(rdev, &cfg80211_rdev_list, list) {
		struct wireless_dev *wdev;

		if (wiphy_net(&rdev->wiphy) != netns)
			continue;

		if (have_wdev_id && rdev->wiphy_idx != wiphy_idx)
			continue;

106
		list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) {
107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124
			if (have_ifidx && wdev->netdev &&
			    wdev->netdev->ifindex == ifidx) {
				result = wdev;
				break;
			}
			if (have_wdev_id && wdev->identifier == (u32)wdev_id) {
				result = wdev;
				break;
			}
		}

		if (result)
			break;
	}

	if (result)
		return result;
	return ERR_PTR(-ENODEV);
125 126
}

127
static struct cfg80211_registered_device *
128
__cfg80211_rdev_from_attrs(struct net *netns, struct nlattr **attrs)
129
{
130 131
	struct cfg80211_registered_device *rdev = NULL, *tmp;
	struct net_device *netdev;
132

133
	ASSERT_RTNL();
134

135
	if (!attrs[NL80211_ATTR_WIPHY] &&
136 137
	    !attrs[NL80211_ATTR_IFINDEX] &&
	    !attrs[NL80211_ATTR_WDEV])
138 139
		return ERR_PTR(-EINVAL);

140
	if (attrs[NL80211_ATTR_WIPHY])
141
		rdev = cfg80211_rdev_by_wiphy_idx(
142
				nla_get_u32(attrs[NL80211_ATTR_WIPHY]));
143

144 145 146 147 148 149 150 151
	if (attrs[NL80211_ATTR_WDEV]) {
		u64 wdev_id = nla_get_u64(attrs[NL80211_ATTR_WDEV]);
		struct wireless_dev *wdev;
		bool found = false;

		tmp = cfg80211_rdev_by_wiphy_idx(wdev_id >> 32);
		if (tmp) {
			/* make sure wdev exists */
152
			list_for_each_entry(wdev, &tmp->wiphy.wdev_list, list) {
153 154 155 156 157 158 159 160 161 162 163 164 165 166 167
				if (wdev->identifier != (u32)wdev_id)
					continue;
				found = true;
				break;
			}

			if (!found)
				tmp = NULL;

			if (rdev && tmp != rdev)
				return ERR_PTR(-EINVAL);
			rdev = tmp;
		}
	}

168 169
	if (attrs[NL80211_ATTR_IFINDEX]) {
		int ifindex = nla_get_u32(attrs[NL80211_ATTR_IFINDEX]);
170

171
		netdev = __dev_get_by_index(netns, ifindex);
172 173
		if (netdev) {
			if (netdev->ieee80211_ptr)
174 175
				tmp = wiphy_to_rdev(
					netdev->ieee80211_ptr->wiphy);
176 177 178 179 180 181 182 183 184 185 186 187
			else
				tmp = NULL;

			/* not wireless device -- return error */
			if (!tmp)
				return ERR_PTR(-EINVAL);

			/* mismatch -- return error */
			if (rdev && tmp != rdev)
				return ERR_PTR(-EINVAL);

			rdev = tmp;
188 189 190
		}
	}

Johannes Berg's avatar
Johannes Berg committed
191 192
	if (!rdev)
		return ERR_PTR(-ENODEV);
193

Johannes Berg's avatar
Johannes Berg committed
194 195 196 197
	if (netns != wiphy_net(&rdev->wiphy))
		return ERR_PTR(-ENODEV);

	return rdev;
198 199 200 201 202 203 204 205 206 207
}

/*
 * This function returns a pointer to the driver
 * that the genl_info item that is passed refers to.
 *
 * The result of this can be a PTR_ERR and hence must
 * be checked with IS_ERR() for errors.
 */
static struct cfg80211_registered_device *
Johannes Berg's avatar
Johannes Berg committed
208
cfg80211_get_dev_from_info(struct net *netns, struct genl_info *info)
209
{
210
	return __cfg80211_rdev_from_attrs(netns, info->attrs);
211 212
}

213
/* policy for the attributes */
214
static const struct nla_policy nl80211_policy[NUM_NL80211_ATTR] = {
215 216
	[NL80211_ATTR_WIPHY] = { .type = NLA_U32 },
	[NL80211_ATTR_WIPHY_NAME] = { .type = NLA_NUL_STRING,
217
				      .len = 20-1 },
218
	[NL80211_ATTR_WIPHY_TXQ_PARAMS] = { .type = NLA_NESTED },
219

220
	[NL80211_ATTR_WIPHY_FREQ] = { .type = NLA_U32 },
Sujith's avatar
Sujith committed
221
	[NL80211_ATTR_WIPHY_CHANNEL_TYPE] = { .type = NLA_U32 },
222 223 224 225
	[NL80211_ATTR_CHANNEL_WIDTH] = { .type = NLA_U32 },
	[NL80211_ATTR_CENTER_FREQ1] = { .type = NLA_U32 },
	[NL80211_ATTR_CENTER_FREQ2] = { .type = NLA_U32 },

226 227 228 229
	[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 },
230
	[NL80211_ATTR_WIPHY_COVERAGE_CLASS] = { .type = NLA_U8 },
231
	[NL80211_ATTR_WIPHY_DYN_ACK] = { .type = NLA_FLAG },
232 233 234 235

	[NL80211_ATTR_IFTYPE] = { .type = NLA_U32 },
	[NL80211_ATTR_IFINDEX] = { .type = NLA_U32 },
	[NL80211_ATTR_IFNAME] = { .type = NLA_NUL_STRING, .len = IFNAMSIZ-1 },
236

237 238
	[NL80211_ATTR_MAC] = { .len = ETH_ALEN },
	[NL80211_ATTR_PREV_BSSID] = { .len = ETH_ALEN },
239

240
	[NL80211_ATTR_KEY] = { .type = NLA_NESTED, },
241 242 243 244 245
	[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 },
246
	[NL80211_ATTR_KEY_SEQ] = { .type = NLA_BINARY, .len = 16 },
247
	[NL80211_ATTR_KEY_TYPE] = { .type = NLA_U32 },
248 249 250 251 252 253 254

	[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 },
255 256 257 258 259
	[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 },
260
	[NL80211_ATTR_STA_PLINK_ACTION] = { .type = NLA_U8 },
261
	[NL80211_ATTR_STA_VLAN] = { .type = NLA_U32 },
Johannes Berg's avatar
Johannes Berg committed
262
	[NL80211_ATTR_MNTR_FLAGS] = { /* NLA_NESTED can't be empty */ },
263
	[NL80211_ATTR_MESH_ID] = { .type = NLA_BINARY,
264
				   .len = IEEE80211_MAX_MESH_ID_LEN },
265
	[NL80211_ATTR_MPATH_NEXT_HOP] = { .type = NLA_U32 },
266

267 268 269
	[NL80211_ATTR_REG_ALPHA2] = { .type = NLA_STRING, .len = 2 },
	[NL80211_ATTR_REG_RULES] = { .type = NLA_NESTED },

270 271 272
	[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 },
273 274
	[NL80211_ATTR_BSS_BASIC_RATES] = { .type = NLA_BINARY,
					   .len = NL80211_MAX_SUPP_RATES },
275
	[NL80211_ATTR_BSS_HT_OPMODE] = { .type = NLA_U16 },
276

277
	[NL80211_ATTR_MESH_CONFIG] = { .type = NLA_NESTED },
278
	[NL80211_ATTR_SUPPORT_MESH_AUTH] = { .type = NLA_FLAG },
279

280
	[NL80211_ATTR_HT_CAPABILITY] = { .len = NL80211_HT_CAPABILITY_LEN },
281 282 283 284

	[NL80211_ATTR_MGMT_SUBTYPE] = { .type = NLA_U8 },
	[NL80211_ATTR_IE] = { .type = NLA_BINARY,
			      .len = IEEE80211_MAX_DATA_LEN },
285 286
	[NL80211_ATTR_SCAN_FREQUENCIES] = { .type = NLA_NESTED },
	[NL80211_ATTR_SCAN_SSIDS] = { .type = NLA_NESTED },
287 288 289 290 291

	[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
292
	[NL80211_ATTR_FREQ_FIXED] = { .type = NLA_FLAG },
293
	[NL80211_ATTR_TIMED_OUT] = { .type = NLA_FLAG },
294
	[NL80211_ATTR_USE_MFP] = { .type = NLA_U32 },
295 296 297
	[NL80211_ATTR_STA_FLAGS2] = {
		.len = sizeof(struct nl80211_sta_flag_update),
	},
298
	[NL80211_ATTR_CONTROL_PORT] = { .type = NLA_FLAG },
299 300
	[NL80211_ATTR_CONTROL_PORT_ETHERTYPE] = { .type = NLA_U16 },
	[NL80211_ATTR_CONTROL_PORT_NO_ENCRYPT] = { .type = NLA_FLAG },
301 302 303
	[NL80211_ATTR_PRIVACY] = { .type = NLA_FLAG },
	[NL80211_ATTR_CIPHER_SUITE_GROUP] = { .type = NLA_U32 },
	[NL80211_ATTR_WPA_VERSIONS] = { .type = NLA_U32 },
304
	[NL80211_ATTR_PID] = { .type = NLA_U32 },
305
	[NL80211_ATTR_4ADDR] = { .type = NLA_U8 },
Samuel Ortiz's avatar
Samuel Ortiz committed
306 307
	[NL80211_ATTR_PMKID] = { .type = NLA_BINARY,
				 .len = WLAN_PMKID_LEN },
308 309
	[NL80211_ATTR_DURATION] = { .type = NLA_U32 },
	[NL80211_ATTR_COOKIE] = { .type = NLA_U64 },
310
	[NL80211_ATTR_TX_RATES] = { .type = NLA_NESTED },
311 312 313
	[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
314
	[NL80211_ATTR_PS_STATE] = { .type = NLA_U32 },
315
	[NL80211_ATTR_CQM] = { .type = NLA_NESTED, },
316
	[NL80211_ATTR_LOCAL_STATE_CHANGE] = { .type = NLA_FLAG },
317
	[NL80211_ATTR_AP_ISOLATE] = { .type = NLA_U8 },
318 319
	[NL80211_ATTR_WIPHY_TX_POWER_SETTING] = { .type = NLA_U32 },
	[NL80211_ATTR_WIPHY_TX_POWER_LEVEL] = { .type = NLA_U32 },
320
	[NL80211_ATTR_FRAME_TYPE] = { .type = NLA_U16 },
321 322
	[NL80211_ATTR_WIPHY_ANTENNA_TX] = { .type = NLA_U32 },
	[NL80211_ATTR_WIPHY_ANTENNA_RX] = { .type = NLA_U32 },
323
	[NL80211_ATTR_MCAST_RATE] = { .type = NLA_U32 },
324
	[NL80211_ATTR_OFFCHANNEL_TX_OK] = { .type = NLA_FLAG },
325
	[NL80211_ATTR_KEY_DEFAULT_TYPES] = { .type = NLA_NESTED },
326
	[NL80211_ATTR_WOWLAN_TRIGGERS] = { .type = NLA_NESTED },
327
	[NL80211_ATTR_STA_PLINK_STATE] = { .type = NLA_U8 },
328
	[NL80211_ATTR_SCHED_SCAN_INTERVAL] = { .type = NLA_U32 },
329
	[NL80211_ATTR_REKEY_DATA] = { .type = NLA_NESTED },
330
	[NL80211_ATTR_SCAN_SUPP_RATES] = { .type = NLA_NESTED },
331
	[NL80211_ATTR_HIDDEN_SSID] = { .type = NLA_U32 },
332 333 334 335
	[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 },
336
	[NL80211_ATTR_ROAM_SUPPORT] = { .type = NLA_FLAG },
337
	[NL80211_ATTR_SCHED_SCAN_MATCH] = { .type = NLA_NESTED },
338
	[NL80211_ATTR_TX_NO_CCK_RATE] = { .type = NLA_FLAG },
339 340 341 342 343
	[NL80211_ATTR_TDLS_ACTION] = { .type = NLA_U8 },
	[NL80211_ATTR_TDLS_DIALOG_TOKEN] = { .type = NLA_U8 },
	[NL80211_ATTR_TDLS_OPERATION] = { .type = NLA_U8 },
	[NL80211_ATTR_TDLS_SUPPORT] = { .type = NLA_FLAG },
	[NL80211_ATTR_TDLS_EXTERNAL_SETUP] = { .type = NLA_FLAG },
344
	[NL80211_ATTR_TDLS_INITIATOR] = { .type = NLA_FLAG },
345
	[NL80211_ATTR_DONT_WAIT_FOR_ACK] = { .type = NLA_FLAG },
346 347
	[NL80211_ATTR_PROBE_RESP] = { .type = NLA_BINARY,
				      .len = IEEE80211_MAX_DATA_LEN },
348
	[NL80211_ATTR_DFS_REGION] = { .type = NLA_U8 },
349 350 351 352
	[NL80211_ATTR_DISABLE_HT] = { .type = NLA_FLAG },
	[NL80211_ATTR_HT_CAPABILITY_MASK] = {
		.len = NL80211_HT_CAPABILITY_LEN
	},
353
	[NL80211_ATTR_NOACK_MAP] = { .type = NLA_U16 },
354
	[NL80211_ATTR_INACTIVITY_TIMEOUT] = { .type = NLA_U16 },
355
	[NL80211_ATTR_BG_SCAN_PERIOD] = { .type = NLA_U16 },
356
	[NL80211_ATTR_WDEV] = { .type = NLA_U64 },
357
	[NL80211_ATTR_USER_REG_HINT_TYPE] = { .type = NLA_U32 },
358
	[NL80211_ATTR_SAE_DATA] = { .type = NLA_BINARY, },
359
	[NL80211_ATTR_VHT_CAPABILITY] = { .len = NL80211_VHT_CAPABILITY_LEN },
360
	[NL80211_ATTR_SCAN_FLAGS] = { .type = NLA_U32 },
361 362
	[NL80211_ATTR_P2P_CTWINDOW] = { .type = NLA_U8 },
	[NL80211_ATTR_P2P_OPPPS] = { .type = NLA_U8 },
363 364
	[NL80211_ATTR_ACL_POLICY] = {. type = NLA_U32 },
	[NL80211_ATTR_MAC_ADDRS] = { .type = NLA_NESTED },
365 366
	[NL80211_ATTR_STA_CAPABILITY] = { .type = NLA_U16 },
	[NL80211_ATTR_STA_EXT_CAPABILITY] = { .type = NLA_BINARY, },
367
	[NL80211_ATTR_SPLIT_WIPHY_DUMP] = { .type = NLA_FLAG, },
368 369 370 371
	[NL80211_ATTR_DISABLE_VHT] = { .type = NLA_FLAG },
	[NL80211_ATTR_VHT_CAPABILITY_MASK] = {
		.len = NL80211_VHT_CAPABILITY_LEN,
	},
372 373 374
	[NL80211_ATTR_MDID] = { .type = NLA_U16 },
	[NL80211_ATTR_IE_RIC] = { .type = NLA_BINARY,
				  .len = IEEE80211_MAX_DATA_LEN },
375
	[NL80211_ATTR_PEER_AID] = { .type = NLA_U16 },
376 377 378
	[NL80211_ATTR_CH_SWITCH_COUNT] = { .type = NLA_U32 },
	[NL80211_ATTR_CH_SWITCH_BLOCK_TX] = { .type = NLA_FLAG },
	[NL80211_ATTR_CSA_IES] = { .type = NLA_NESTED },
379 380
	[NL80211_ATTR_CSA_C_OFF_BEACON] = { .type = NLA_BINARY },
	[NL80211_ATTR_CSA_C_OFF_PRESP] = { .type = NLA_BINARY },
381 382
	[NL80211_ATTR_STA_SUPPORTED_CHANNELS] = { .type = NLA_BINARY },
	[NL80211_ATTR_STA_SUPPORTED_OPER_CLASSES] = { .type = NLA_BINARY },
383
	[NL80211_ATTR_HANDLE_DFS] = { .type = NLA_FLAG },
384
	[NL80211_ATTR_OPMODE_NOTIF] = { .type = NLA_U8 },
385 386 387
	[NL80211_ATTR_VENDOR_ID] = { .type = NLA_U32 },
	[NL80211_ATTR_VENDOR_SUBCMD] = { .type = NLA_U32 },
	[NL80211_ATTR_VENDOR_DATA] = { .type = NLA_BINARY },
388 389
	[NL80211_ATTR_QOS_MAP] = { .type = NLA_BINARY,
				   .len = IEEE80211_QOS_MAP_LEN_MAX },
390 391
	[NL80211_ATTR_MAC_HINT] = { .len = ETH_ALEN },
	[NL80211_ATTR_WIPHY_FREQ_HINT] = { .type = NLA_U32 },
392
	[NL80211_ATTR_TDLS_PEER_CAPABILITY] = { .type = NLA_U32 },
393
	[NL80211_ATTR_SOCKET_OWNER] = { .type = NLA_FLAG },
394
	[NL80211_ATTR_CSA_C_OFFSETS_TX] = { .type = NLA_BINARY },
395
	[NL80211_ATTR_USE_RRM] = { .type = NLA_FLAG },
396 397 398
	[NL80211_ATTR_TSID] = { .type = NLA_U8 },
	[NL80211_ATTR_USER_PRIO] = { .type = NLA_U8 },
	[NL80211_ATTR_ADMITTED_TIME] = { .type = NLA_U16 },
399
	[NL80211_ATTR_SMPS_MODE] = { .type = NLA_U8 },
400
	[NL80211_ATTR_MAC_MASK] = { .len = ETH_ALEN },
401
	[NL80211_ATTR_WIPHY_SELF_MANAGED_REG] = { .type = NLA_FLAG },
402
	[NL80211_ATTR_NETNS_FD] = { .type = NLA_U32 },
403
	[NL80211_ATTR_SCHED_SCAN_DELAY] = { .type = NLA_U32 },
404
	[NL80211_ATTR_REG_INDOOR] = { .type = NLA_FLAG },
405
	[NL80211_ATTR_PBSS] = { .type = NLA_FLAG },
406
	[NL80211_ATTR_BSS_SELECT] = { .type = NLA_NESTED },
407
	[NL80211_ATTR_STA_SUPPORT_P2P_PS] = { .type = NLA_U8 },
408 409
};

410
/* policy for the key attributes */
Alexey Dobriyan's avatar
Alexey Dobriyan committed
411
static const struct nla_policy nl80211_key_policy[NL80211_KEY_MAX + 1] = {
Johannes Berg's avatar
Johannes Berg committed
412
	[NL80211_KEY_DATA] = { .type = NLA_BINARY, .len = WLAN_MAX_KEY_LEN },
413 414
	[NL80211_KEY_IDX] = { .type = NLA_U8 },
	[NL80211_KEY_CIPHER] = { .type = NLA_U32 },
415
	[NL80211_KEY_SEQ] = { .type = NLA_BINARY, .len = 16 },
416 417
	[NL80211_KEY_DEFAULT] = { .type = NLA_FLAG },
	[NL80211_KEY_DEFAULT_MGMT] = { .type = NLA_FLAG },
418
	[NL80211_KEY_TYPE] = { .type = NLA_U32 },
419 420 421 422 423 424 425 426
	[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 },
427 428
};

429 430 431 432 433 434 435
/* 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 },
436 437 438 439
	[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 },
440
	[NL80211_WOWLAN_TRIG_TCP_CONNECTION] = { .type = NLA_NESTED },
441
	[NL80211_WOWLAN_TRIG_NET_DETECT] = { .type = NLA_NESTED },
442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460
};

static const struct nla_policy
nl80211_wowlan_tcp_policy[NUM_NL80211_WOWLAN_TCP] = {
	[NL80211_WOWLAN_TCP_SRC_IPV4] = { .type = NLA_U32 },
	[NL80211_WOWLAN_TCP_DST_IPV4] = { .type = NLA_U32 },
	[NL80211_WOWLAN_TCP_DST_MAC] = { .len = ETH_ALEN },
	[NL80211_WOWLAN_TCP_SRC_PORT] = { .type = NLA_U16 },
	[NL80211_WOWLAN_TCP_DST_PORT] = { .type = NLA_U16 },
	[NL80211_WOWLAN_TCP_DATA_PAYLOAD] = { .len = 1 },
	[NL80211_WOWLAN_TCP_DATA_PAYLOAD_SEQ] = {
		.len = sizeof(struct nl80211_wowlan_tcp_data_seq)
	},
	[NL80211_WOWLAN_TCP_DATA_PAYLOAD_TOKEN] = {
		.len = sizeof(struct nl80211_wowlan_tcp_data_token)
	},
	[NL80211_WOWLAN_TCP_DATA_INTERVAL] = { .type = NLA_U32 },
	[NL80211_WOWLAN_TCP_WAKE_PAYLOAD] = { .len = 1 },
	[NL80211_WOWLAN_TCP_WAKE_MASK] = { .len = 1 },
461 462
};

463 464 465 466 467 468 469 470
/* policy for coalesce rule attributes */
static const struct nla_policy
nl80211_coalesce_policy[NUM_NL80211_ATTR_COALESCE_RULE] = {
	[NL80211_ATTR_COALESCE_RULE_DELAY] = { .type = NLA_U32 },
	[NL80211_ATTR_COALESCE_RULE_CONDITION] = { .type = NLA_U32 },
	[NL80211_ATTR_COALESCE_RULE_PKT_PATTERN] = { .type = NLA_NESTED },
};

471 472 473 474 475 476 477 478
/* 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 },
};

479 480
static const struct nla_policy
nl80211_match_policy[NL80211_SCHED_SCAN_MATCH_ATTR_MAX + 1] = {
481
	[NL80211_SCHED_SCAN_MATCH_ATTR_SSID] = { .type = NLA_BINARY,
482
						 .len = IEEE80211_MAX_SSID_LEN },
483
	[NL80211_SCHED_SCAN_MATCH_ATTR_RSSI] = { .type = NLA_U32 },
484 485
};

486 487 488 489 490 491
static const struct nla_policy
nl80211_plan_policy[NL80211_SCHED_SCAN_PLAN_MAX + 1] = {
	[NL80211_SCHED_SCAN_PLAN_INTERVAL] = { .type = NLA_U32 },
	[NL80211_SCHED_SCAN_PLAN_ITERATIONS] = { .type = NLA_U32 },
};

492 493 494 495 496 497 498 499 500
static const struct nla_policy
nl80211_bss_select_policy[NL80211_BSS_SELECT_ATTR_MAX + 1] = {
	[NL80211_BSS_SELECT_ATTR_RSSI] = { .type = NLA_FLAG },
	[NL80211_BSS_SELECT_ATTR_BAND_PREF] = { .type = NLA_U32 },
	[NL80211_BSS_SELECT_ATTR_RSSI_ADJUST] = {
		.len = sizeof(struct nl80211_bss_select_rssi_adjust)
	},
};

501 502 503 504
static int nl80211_prepare_wdev_dump(struct sk_buff *skb,
				     struct netlink_callback *cb,
				     struct cfg80211_registered_device **rdev,
				     struct wireless_dev **wdev)
505
{
506
	int err;
507

508
	rtnl_lock();
509

510 511 512 513 514 515
	if (!cb->args[0]) {
		err = nlmsg_parse(cb->nlh, GENL_HDRLEN + nl80211_fam.hdrsize,
				  nl80211_fam.attrbuf, nl80211_fam.maxattr,
				  nl80211_policy);
		if (err)
			goto out_unlock;
516

517 518 519 520 521 522
		*wdev = __cfg80211_wdev_from_attrs(sock_net(skb->sk),
						   nl80211_fam.attrbuf);
		if (IS_ERR(*wdev)) {
			err = PTR_ERR(*wdev);
			goto out_unlock;
		}
523
		*rdev = wiphy_to_rdev((*wdev)->wiphy);
524 525
		/* 0 is the first index - add 1 to parse only once */
		cb->args[0] = (*rdev)->wiphy_idx + 1;
526 527
		cb->args[1] = (*wdev)->identifier;
	} else {
528 529
		/* subtract the 1 again here */
		struct wiphy *wiphy = wiphy_idx_to_wiphy(cb->args[0] - 1);
530
		struct wireless_dev *tmp;
531

532 533 534 535
		if (!wiphy) {
			err = -ENODEV;
			goto out_unlock;
		}
536
		*rdev = wiphy_to_rdev(wiphy);
537
		*wdev = NULL;
538

539
		list_for_each_entry(tmp, &(*rdev)->wiphy.wdev_list, list) {
540 541 542 543 544
			if (tmp->identifier == cb->args[1]) {
				*wdev = tmp;
				break;
			}
		}
545

546 547 548 549
		if (!*wdev) {
			err = -ENODEV;
			goto out_unlock;
		}
550 551 552
	}

	return 0;
553
 out_unlock:
554 555 556 557
	rtnl_unlock();
	return err;
}

558
static void nl80211_finish_wdev_dump(struct cfg80211_registered_device *rdev)
559 560 561 562
{
	rtnl_unlock();
}

563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592
/* 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;
}

593
/* message building helper */
594
static inline void *nl80211hdr_put(struct sk_buff *skb, u32 portid, u32 seq,
595 596 597
				   int flags, u8 cmd)
{
	/* since there is no private header just add the generic one */
598
	return genlmsg_put(skb, portid, seq, &nl80211_fam, flags, cmd);
599 600
}

601
static int nl80211_msg_put_channel(struct sk_buff *msg,
602 603
				   struct ieee80211_channel *chan,
				   bool large)
604
{
605 606 607 608 609 610 611
	/* Some channels must be completely excluded from the
	 * list to protect old user-space tools from breaking
	 */
	if (!large && chan->flags &
	    (IEEE80211_CHAN_NO_10MHZ | IEEE80211_CHAN_NO_20MHZ))
		return 0;

612 613 614
	if (nla_put_u32(msg, NL80211_FREQUENCY_ATTR_FREQ,
			chan->center_freq))
		goto nla_put_failure;
615

616 617 618
	if ((chan->flags & IEEE80211_CHAN_DISABLED) &&
	    nla_put_flag(msg, NL80211_FREQUENCY_ATTR_DISABLED))
		goto nla_put_failure;
619 620 621 622 623 624
	if (chan->flags & IEEE80211_CHAN_NO_IR) {
		if (nla_put_flag(msg, NL80211_FREQUENCY_ATTR_NO_IR))
			goto nla_put_failure;
		if (nla_put_flag(msg, __NL80211_FREQUENCY_ATTR_NO_IBSS))
			goto nla_put_failure;
	}
625 626 627 628 629 630 631 632 633 634 635 636 637 638
	if (chan->flags & IEEE80211_CHAN_RADAR) {
		if (nla_put_flag(msg, NL80211_FREQUENCY_ATTR_RADAR))
			goto nla_put_failure;
		if (large) {
			u32 time;

			time = elapsed_jiffies_msecs(chan->dfs_state_entered);

			if (nla_put_u32(msg, NL80211_FREQUENCY_ATTR_DFS_STATE,
					chan->dfs_state))
				goto nla_put_failure;
			if (nla_put_u32(msg, NL80211_FREQUENCY_ATTR_DFS_TIME,
					time))
				goto nla_put_failure;
639 640 641 642
			if (nla_put_u32(msg,
					NL80211_FREQUENCY_ATTR_DFS_CAC_TIME,
					chan->dfs_cac_ms))
				goto nla_put_failure;
643 644
		}
	}
645

646 647 648 649 650 651 652 653 654 655 656 657 658
	if (large) {
		if ((chan->flags & IEEE80211_CHAN_NO_HT40MINUS) &&
		    nla_put_flag(msg, NL80211_FREQUENCY_ATTR_NO_HT40_MINUS))
			goto nla_put_failure;
		if ((chan->flags & IEEE80211_CHAN_NO_HT40PLUS) &&
		    nla_put_flag(msg, NL80211_FREQUENCY_ATTR_NO_HT40_PLUS))
			goto nla_put_failure;
		if ((chan->flags & IEEE80211_CHAN_NO_80MHZ) &&
		    nla_put_flag(msg, NL80211_FREQUENCY_ATTR_NO_80MHZ))
			goto nla_put_failure;
		if ((chan->flags & IEEE80211_CHAN_NO_160MHZ) &&
		    nla_put_flag(msg, NL80211_FREQUENCY_ATTR_NO_160MHZ))
			goto nla_put_failure;
659 660 661
		if ((chan->flags & IEEE80211_CHAN_INDOOR_ONLY) &&
		    nla_put_flag(msg, NL80211_FREQUENCY_ATTR_INDOOR_ONLY))
			goto nla_put_failure;
662 663
		if ((chan->flags & IEEE80211_CHAN_IR_CONCURRENT) &&
		    nla_put_flag(msg, NL80211_FREQUENCY_ATTR_IR_CONCURRENT))
664
			goto nla_put_failure;
665 666 667 668 669 670
		if ((chan->flags & IEEE80211_CHAN_NO_20MHZ) &&
		    nla_put_flag(msg, NL80211_FREQUENCY_ATTR_NO_20MHZ))
			goto nla_put_failure;
		if ((chan->flags & IEEE80211_CHAN_NO_10MHZ) &&
		    nla_put_flag(msg, NL80211_FREQUENCY_ATTR_NO_10MHZ))
			goto nla_put_failure;
671 672
	}

673 674 675
	if (nla_put_u32(msg, NL80211_FREQUENCY_ATTR_MAX_TX_POWER,
			DBM_TO_MBM(chan->max_power)))
		goto nla_put_failure;
676 677 678 679 680 681 682

	return 0;

 nla_put_failure:
	return -ENOBUFS;
}

683 684
/* netlink command implementations */

685 686 687
struct key_parse {
	struct key_params p;
	int idx;
688
	int type;
689
	bool def, defmgmt;
690
	bool def_uni, def_multi;
691 692 693 694 695 696 697 698 699 700 701 702 703
};

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];

704 705 706 707 708 709 710
	if (k->def) {
		k->def_uni = true;
		k->def_multi = true;
	}
	if (k->defmgmt)
		k->def_multi = true;

711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726
	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]);

727 728 729 730 731 732
	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;
	}

733 734
	if (tb[NL80211_KEY_DEFAULT_TYPES]) {
		struct nlattr *kdt[NUM_NL80211_KEY_DEFAULT_TYPES];
735

736 737 738
		err = nla_parse_nested(kdt, NUM_NL80211_KEY_DEFAULT_TYPES - 1,
				       tb[NL80211_KEY_DEFAULT_TYPES],
				       nl80211_key_default_policy);
739 740 741 742 743 744 745
		if (err)
			return err;

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

746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769
	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];

770 771 772 773 774 775 776
	if (k->def) {
		k->def_uni = true;
		k->def_multi = true;
	}
	if (k->defmgmt)
		k->def_multi = true;

777 778 779 780 781 782
	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;
	}

783 784 785 786 787 788 789 790 791 792 793 794 795
	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];
	}

796 797 798 799 800 801 802 803 804
	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;
805
	k->type = -1;
806 807 808 809 810 811 812 813 814 815 816 817

	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;

818 819 820 821 822
	if (k->defmgmt) {
		if (k->def_uni || !k->def_multi)
			return -EINVAL;
	}

823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838
	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
839 840
static struct cfg80211_cached_keys *
nl80211_parse_connkeys(struct cfg80211_registered_device *rdev,
841
		       struct nlattr *keys, bool *no_ht)
Johannes Berg's avatar
Johannes Berg committed
842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871
{
	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;
872 873
			if (!parse.def_uni || !parse.def_multi)
				goto error;
Johannes Berg's avatar
Johannes Berg committed
874 875 876
		} else if (parse.defmgmt)
			goto error;
		err = cfg80211_validate_key_settings(rdev, &parse.p,
877
						     parse.idx, false, NULL);
Johannes Berg's avatar
Johannes Berg committed
878 879 880 881 882 883
		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);
884 885 886 887 888 889

		if (parse.p.cipher == WLAN_CIPHER_SUITE_WEP40 ||
		    parse.p.cipher == WLAN_CIPHER_SUITE_WEP104) {
			if (no_ht)
				*no_ht = true;
		}
Johannes Berg's avatar
Johannes Berg committed
890 891 892 893 894 895 896 897 898 899 900 901 902 903 904
	}

	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:
905
	case NL80211_IFTYPE_P2P_GO:
906
	case NL80211_IFTYPE_MESH_POINT:
Johannes Berg's avatar
Johannes Berg committed
907 908 909
		break;
	case NL80211_IFTYPE_ADHOC:
	case NL80211_IFTYPE_STATION:
910
	case NL80211_IFTYPE_P2P_CLIENT:
911
		if (!wdev->current_bss)
Johannes Berg's avatar
Johannes Berg committed
912 913
			return -ENOLINK;
		break;
914
	case NL80211_IFTYPE_UNSPECIFIED:
915
	case NL80211_IFTYPE_OCB:
916 917 918 919
	case NL80211_IFTYPE_MONITOR:
	case NL80211_IFTYPE_P2P_DEVICE:
	case NL80211_IFTYPE_WDS:
	case NUM_NL80211_IFTYPES:
Johannes Berg's avatar
Johannes Berg committed
920 921 922 923 924 925
		return -EINVAL;
	}

	return 0;
}

926 927 928 929 930 931 932 933 934 935 936 937 938
static struct ieee80211_channel *nl80211_get_valid_chan(struct wiphy *wiphy,
							struct nlattr *tb)
{
	struct ieee80211_channel *chan;

	if (tb == NULL)
		return NULL;
	chan = ieee80211_get_channel(wiphy, nla_get_u32(tb));
	if (!chan || chan->flags & IEEE80211_CHAN_DISABLED)
		return NULL;
	return chan;
}

939 940 941 942 943 944 945 946 947 948
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) {
949 950
		if ((ifmodes & 1) && nla_put_flag(msg, i))
			goto nla_put_failure;
951 952 953 954 955 956 957 958 959 960 961 962
		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,
963 964
					  struct sk_buff *msg,
					  bool large)
965 966 967 968 969 970 971 972 973 974 975 976 977 978 979 980 981 982 983 984 985 986 987 988 989 990 991 992 993
{
	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;
994 995 996
			if (nla_put_u32(msg, NL80211_IFACE_LIMIT_MAX,
					c->limits[j].max))
				goto nla_put_failure;
997 998 999 1000 1001 1002 1003 1004
			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);

1005 1006 1007 1008 1009 1010 1011 1012
		if (c->beacon_int_infra_match &&
		    nla_put_flag(msg, NL80211_IFACE_COMB_STA_AP_BI_MATCH))
			goto nla_put_failure;
		if (nla_put_u32(msg, NL80211_IFACE_COMB_NUM_CHANNELS,
				c->num_different_channels) ||
		    nla_put_u32(msg, NL80211_IFACE_COMB_MAXNUM,
				c->max_interfaces))
			goto nla_put_failure;