Adding upstream version 4.19.249.upstream/4.19.249upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 2010 insertions, 0 deletions

diff --git a/net/wireless/util.c b/net/wireless/util.c
new file mode 100644
index 000000000..82bf1339c
--- /dev/null
+++ b/net/wireless/util.c
@@ -0,0 +1,2010 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Wireless utility functions
+ *
+ * Copyright 2007-2009	Johannes Berg <johannes@sipsolutions.net>
+ * Copyright 2013-2014  Intel Mobile Communications GmbH
+ * Copyright 2017	Intel Deutschland GmbH
+ */
+#include <linux/export.h>
+#include <linux/bitops.h>
+#include <linux/etherdevice.h>
+#include <linux/slab.h>
+#include <net/cfg80211.h>
+#include <net/ip.h>
+#include <net/dsfield.h>
+#include <linux/if_vlan.h>
+#include <linux/mpls.h>
+#include <linux/gcd.h>
+#include "core.h"
+#include "rdev-ops.h"
+
+
+struct ieee80211_rate *
+ieee80211_get_response_rate(struct ieee80211_supported_band *sband,
+			    u32 basic_rates, int bitrate)
+{
+	struct ieee80211_rate *result = &sband->bitrates[0];
+	int i;
+
+	for (i = 0; i < sband->n_bitrates; i++) {
+		if (!(basic_rates & BIT(i)))
+			continue;
+		if (sband->bitrates[i].bitrate > bitrate)
+			continue;
+		result = &sband->bitrates[i];
+	}
+
+	return result;
+}
+EXPORT_SYMBOL(ieee80211_get_response_rate);
+
+u32 ieee80211_mandatory_rates(struct ieee80211_supported_band *sband,
+			      enum nl80211_bss_scan_width scan_width)
+{
+	struct ieee80211_rate *bitrates;
+	u32 mandatory_rates = 0;
+	enum ieee80211_rate_flags mandatory_flag;
+	int i;
+
+	if (WARN_ON(!sband))
+		return 1;
+
+	if (sband->band == NL80211_BAND_2GHZ) {
+		if (scan_width == NL80211_BSS_CHAN_WIDTH_5 ||
+		    scan_width == NL80211_BSS_CHAN_WIDTH_10)
+			mandatory_flag = IEEE80211_RATE_MANDATORY_G;
+		else
+			mandatory_flag = IEEE80211_RATE_MANDATORY_B;
+	} else {
+		mandatory_flag = IEEE80211_RATE_MANDATORY_A;
+	}
+
+	bitrates = sband->bitrates;
+	for (i = 0; i < sband->n_bitrates; i++)
+		if (bitrates[i].flags & mandatory_flag)
+			mandatory_rates |= BIT(i);
+	return mandatory_rates;
+}
+EXPORT_SYMBOL(ieee80211_mandatory_rates);
+
+int ieee80211_channel_to_frequency(int chan, enum nl80211_band band)
+{
+	/* see 802.11 17.3.8.3.2 and Annex J
+	 * there are overlapping channel numbers in 5GHz and 2GHz bands */
+	if (chan <= 0)
+		return 0; /* not supported */
+	switch (band) {
+	case NL80211_BAND_2GHZ:
+		if (chan == 14)
+			return 2484;
+		else if (chan < 14)
+			return 2407 + chan * 5;
+		break;
+	case NL80211_BAND_5GHZ:
+		if (chan >= 182 && chan <= 196)
+			return 4000 + chan * 5;
+		else
+			return 5000 + chan * 5;
+		break;
+	case NL80211_BAND_60GHZ:
+		if (chan < 5)
+			return 56160 + chan * 2160;
+		break;
+	default:
+		;
+	}
+	return 0; /* not supported */
+}
+EXPORT_SYMBOL(ieee80211_channel_to_frequency);
+
+int ieee80211_frequency_to_channel(int freq)
+{
+	/* see 802.11 17.3.8.3.2 and Annex J */
+	if (freq == 2484)
+		return 14;
+	else if (freq < 2484)
+		return (freq - 2407) / 5;
+	else if (freq >= 4910 && freq <= 4980)
+		return (freq - 4000) / 5;
+	else if (freq <= 45000) /* DMG band lower limit */
+		return (freq - 5000) / 5;
+	else if (freq >= 58320 && freq <= 64800)
+		return (freq - 56160) / 2160;
+	else
+		return 0;
+}
+EXPORT_SYMBOL(ieee80211_frequency_to_channel);
+
+struct ieee80211_channel *ieee80211_get_channel(struct wiphy *wiphy, int freq)
+{
+	enum nl80211_band band;
+	struct ieee80211_supported_band *sband;
+	int i;
+
+	for (band = 0; band < NUM_NL80211_BANDS; band++) {
+		sband = wiphy->bands[band];
+
+		if (!sband)
+			continue;
+
+		for (i = 0; i < sband->n_channels; i++) {
+			if (sband->channels[i].center_freq == freq)
+				return &sband->channels[i];
+		}
+	}
+
+	return NULL;
+}
+EXPORT_SYMBOL(ieee80211_get_channel);
+
+static void set_mandatory_flags_band(struct ieee80211_supported_band *sband)
+{
+	int i, want;
+
+	switch (sband->band) {
+	case NL80211_BAND_5GHZ:
+		want = 3;
+		for (i = 0; i < sband->n_bitrates; i++) {
+			if (sband->bitrates[i].bitrate == 60 ||
+			    sband->bitrates[i].bitrate == 120 ||
+			    sband->bitrates[i].bitrate == 240) {
+				sband->bitrates[i].flags |=
+					IEEE80211_RATE_MANDATORY_A;
+				want--;
+			}
+		}
+		WARN_ON(want);
+		break;
+	case NL80211_BAND_2GHZ:
+		want = 7;
+		for (i = 0; i < sband->n_bitrates; i++) {
+			switch (sband->bitrates[i].bitrate) {
+			case 10:
+			case 20:
+			case 55:
+			case 110:
+				sband->bitrates[i].flags |=
+					IEEE80211_RATE_MANDATORY_B |
+					IEEE80211_RATE_MANDATORY_G;
+				want--;
+				break;
+			case 60:
+			case 120:
+			case 240:
+				sband->bitrates[i].flags |=
+					IEEE80211_RATE_MANDATORY_G;
+				want--;
+				/* fall through */
+			default:
+				sband->bitrates[i].flags |=
+					IEEE80211_RATE_ERP_G;
+				break;
+			}
+		}
+		WARN_ON(want != 0 && want != 3);
+		break;
+	case NL80211_BAND_60GHZ:
+		/* check for mandatory HT MCS 1..4 */
+		WARN_ON(!sband->ht_cap.ht_supported);
+		WARN_ON((sband->ht_cap.mcs.rx_mask[0] & 0x1e) != 0x1e);
+		break;
+	case NUM_NL80211_BANDS:
+	default:
+		WARN_ON(1);
+		break;
+	}
+}
+
+void ieee80211_set_bitrate_flags(struct wiphy *wiphy)
+{
+	enum nl80211_band band;
+
+	for (band = 0; band < NUM_NL80211_BANDS; band++)
+		if (wiphy->bands[band])
+			set_mandatory_flags_band(wiphy->bands[band]);
+}
+
+bool cfg80211_supported_cipher_suite(struct wiphy *wiphy, u32 cipher)
+{
+	int i;
+	for (i = 0; i < wiphy->n_cipher_suites; i++)
+		if (cipher == wiphy->cipher_suites[i])
+			return true;
+	return false;
+}
+
+static bool
+cfg80211_igtk_cipher_supported(struct cfg80211_registered_device *rdev)
+{
+	struct wiphy *wiphy = &rdev->wiphy;
+	int i;
+
+	for (i = 0; i < wiphy->n_cipher_suites; i++) {
+		switch (wiphy->cipher_suites[i]) {
+		case WLAN_CIPHER_SUITE_AES_CMAC:
+		case WLAN_CIPHER_SUITE_BIP_CMAC_256:
+		case WLAN_CIPHER_SUITE_BIP_GMAC_128:
+		case WLAN_CIPHER_SUITE_BIP_GMAC_256:
+			return true;
+		}
+	}
+
+	return false;
+}
+
+bool cfg80211_valid_key_idx(struct cfg80211_registered_device *rdev,
+			    int key_idx, bool pairwise)
+{
+	int max_key_idx;
+
+	if (pairwise)
+		max_key_idx = 3;
+	else if (cfg80211_igtk_cipher_supported(rdev))
+		max_key_idx = 5;
+	else
+		max_key_idx = 3;
+
+	if (key_idx < 0 || key_idx > max_key_idx)
+		return false;
+
+	return true;
+}
+
+int cfg80211_validate_key_settings(struct cfg80211_registered_device *rdev,
+				   struct key_params *params, int key_idx,
+				   bool pairwise, const u8 *mac_addr)
+{
+	if (!cfg80211_valid_key_idx(rdev, key_idx, pairwise))
+		return -EINVAL;
+
+	if (!pairwise && mac_addr && !(rdev->wiphy.flags & WIPHY_FLAG_IBSS_RSN))
+		return -EINVAL;
+
+	if (pairwise && !mac_addr)
+		return -EINVAL;
+
+	switch (params->cipher) {
+	case WLAN_CIPHER_SUITE_TKIP:
+	case WLAN_CIPHER_SUITE_CCMP:
+	case WLAN_CIPHER_SUITE_CCMP_256:
+	case WLAN_CIPHER_SUITE_GCMP:
+	case WLAN_CIPHER_SUITE_GCMP_256:
+		/* Disallow pairwise keys with non-zero index unless it's WEP
+		 * or a vendor specific cipher (because current deployments use
+		 * pairwise WEP keys with non-zero indices and for vendor
+		 * specific ciphers this should be validated in the driver or
+		 * hardware level - but 802.11i clearly specifies to use zero)
+		 */
+		if (pairwise && key_idx)
+			return -EINVAL;
+		break;
+	case WLAN_CIPHER_SUITE_AES_CMAC:
+	case WLAN_CIPHER_SUITE_BIP_CMAC_256:
+	case WLAN_CIPHER_SUITE_BIP_GMAC_128:
+	case WLAN_CIPHER_SUITE_BIP_GMAC_256:
+		/* Disallow BIP (group-only) cipher as pairwise cipher */
+		if (pairwise)
+			return -EINVAL;
+		if (key_idx < 4)
+			return -EINVAL;
+		break;
+	case WLAN_CIPHER_SUITE_WEP40:
+	case WLAN_CIPHER_SUITE_WEP104:
+		if (key_idx > 3)
+			return -EINVAL;
+	default:
+		break;
+	}
+
+	switch (params->cipher) {
+	case WLAN_CIPHER_SUITE_WEP40:
+		if (params->key_len != WLAN_KEY_LEN_WEP40)
+			return -EINVAL;
+		break;
+	case WLAN_CIPHER_SUITE_TKIP:
+		if (params->key_len != WLAN_KEY_LEN_TKIP)
+			return -EINVAL;
+		break;
+	case WLAN_CIPHER_SUITE_CCMP:
+		if (params->key_len != WLAN_KEY_LEN_CCMP)
+			return -EINVAL;
+		break;
+	case WLAN_CIPHER_SUITE_CCMP_256:
+		if (params->key_len != WLAN_KEY_LEN_CCMP_256)
+			return -EINVAL;
+		break;
+	case WLAN_CIPHER_SUITE_GCMP:
+		if (params->key_len != WLAN_KEY_LEN_GCMP)
+			return -EINVAL;
+		break;
+	case WLAN_CIPHER_SUITE_GCMP_256:
+		if (params->key_len != WLAN_KEY_LEN_GCMP_256)
+			return -EINVAL;
+		break;
+	case WLAN_CIPHER_SUITE_WEP104:
+		if (params->key_len != WLAN_KEY_LEN_WEP104)
+			return -EINVAL;
+		break;
+	case WLAN_CIPHER_SUITE_AES_CMAC:
+		if (params->key_len != WLAN_KEY_LEN_AES_CMAC)
+			return -EINVAL;
+		break;
+	case WLAN_CIPHER_SUITE_BIP_CMAC_256:
+		if (params->key_len != WLAN_KEY_LEN_BIP_CMAC_256)
+			return -EINVAL;
+		break;
+	case WLAN_CIPHER_SUITE_BIP_GMAC_128:
+		if (params->key_len != WLAN_KEY_LEN_BIP_GMAC_128)
+			return -EINVAL;
+		break;
+	case WLAN_CIPHER_SUITE_BIP_GMAC_256:
+		if (params->key_len != WLAN_KEY_LEN_BIP_GMAC_256)
+			return -EINVAL;
+		break;
+	default:
+		/*
+		 * We don't know anything about this algorithm,
+		 * allow using it -- but the driver must check
+		 * all parameters! We still check below whether
+		 * or not the driver supports this algorithm,
+		 * of course.
+		 */
+		break;
+	}
+
+	if (params->seq) {
+		switch (params->cipher) {
+		case WLAN_CIPHER_SUITE_WEP40:
+		case WLAN_CIPHER_SUITE_WEP104:
+			/* These ciphers do not use key sequence */
+			return -EINVAL;
+		case WLAN_CIPHER_SUITE_TKIP:
+		case WLAN_CIPHER_SUITE_CCMP:
+		case WLAN_CIPHER_SUITE_CCMP_256:
+		case WLAN_CIPHER_SUITE_GCMP:
+		case WLAN_CIPHER_SUITE_GCMP_256:
+		case WLAN_CIPHER_SUITE_AES_CMAC:
+		case WLAN_CIPHER_SUITE_BIP_CMAC_256:
+		case WLAN_CIPHER_SUITE_BIP_GMAC_128:
+		case WLAN_CIPHER_SUITE_BIP_GMAC_256:
+			if (params->seq_len != 6)
+				return -EINVAL;
+			break;
+		}
+	}
+
+	if (!cfg80211_supported_cipher_suite(&rdev->wiphy, params->cipher))
+		return -EINVAL;
+
+	return 0;
+}
+
+unsigned int __attribute_const__ ieee80211_hdrlen(__le16 fc)
+{
+	unsigned int hdrlen = 24;
+
+	if (ieee80211_is_data(fc)) {
+		if (ieee80211_has_a4(fc))
+			hdrlen = 30;
+		if (ieee80211_is_data_qos(fc)) {
+			hdrlen += IEEE80211_QOS_CTL_LEN;
+			if (ieee80211_has_order(fc))
+				hdrlen += IEEE80211_HT_CTL_LEN;
+		}
+		goto out;
+	}
+
+	if (ieee80211_is_mgmt(fc)) {
+		if (ieee80211_has_order(fc))
+			hdrlen += IEEE80211_HT_CTL_LEN;
+		goto out;
+	}
+
+	if (ieee80211_is_ctl(fc)) {
+		/*
+		 * ACK and CTS are 10 bytes, all others 16. To see how
+		 * to get this condition consider
+		 *   subtype mask:   0b0000000011110000 (0x00F0)
+		 *   ACK subtype:    0b0000000011010000 (0x00D0)
+		 *   CTS subtype:    0b0000000011000000 (0x00C0)
+		 *   bits that matter:         ^^^      (0x00E0)
+		 *   value of those: 0b0000000011000000 (0x00C0)
+		 */
+		if ((fc & cpu_to_le16(0x00E0)) == cpu_to_le16(0x00C0))
+			hdrlen = 10;
+		else
+			hdrlen = 16;
+	}
+out:
+	return hdrlen;
+}
+EXPORT_SYMBOL(ieee80211_hdrlen);
+
+unsigned int ieee80211_get_hdrlen_from_skb(const struct sk_buff *skb)
+{
+	const struct ieee80211_hdr *hdr =
+			(const struct ieee80211_hdr *)skb->data;
+	unsigned int hdrlen;
+
+	if (unlikely(skb->len < 10))
+		return 0;
+	hdrlen = ieee80211_hdrlen(hdr->frame_control);
+	if (unlikely(hdrlen > skb->len))
+		return 0;
+	return hdrlen;
+}
+EXPORT_SYMBOL(ieee80211_get_hdrlen_from_skb);
+
+static unsigned int __ieee80211_get_mesh_hdrlen(u8 flags)
+{
+	int ae = flags & MESH_FLAGS_AE;
+	/* 802.11-2012, 8.2.4.7.3 */
+	switch (ae) {
+	default:
+	case 0:
+		return 6;
+	case MESH_FLAGS_AE_A4:
+		return 12;
+	case MESH_FLAGS_AE_A5_A6:
+		return 18;
+	}
+}
+
+unsigned int ieee80211_get_mesh_hdrlen(struct ieee80211s_hdr *meshhdr)
+{
+	return __ieee80211_get_mesh_hdrlen(meshhdr->flags);
+}
+EXPORT_SYMBOL(ieee80211_get_mesh_hdrlen);
+
+int ieee80211_data_to_8023_exthdr(struct sk_buff *skb, struct ethhdr *ehdr,
+				  const u8 *addr, enum nl80211_iftype iftype,
+				  u8 data_offset, bool is_amsdu)
+{
+	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
+	struct {
+		u8 hdr[ETH_ALEN] __aligned(2);
+		__be16 proto;
+	} payload;
+	struct ethhdr tmp;
+	u16 hdrlen;
+	u8 mesh_flags = 0;
+
+	if (unlikely(!ieee80211_is_data_present(hdr->frame_control)))
+		return -1;
+
+	hdrlen = ieee80211_hdrlen(hdr->frame_control) + data_offset;
+	if (skb->len < hdrlen + 8)
+		return -1;
+
+	/* convert IEEE 802.11 header + possible LLC headers into Ethernet
+	 * header
+	 * IEEE 802.11 address fields:
+	 * ToDS FromDS Addr1 Addr2 Addr3 Addr4
+	 *   0     0   DA    SA    BSSID n/a
+	 *   0     1   DA    BSSID SA    n/a
+	 *   1     0   BSSID SA    DA    n/a
+	 *   1     1   RA    TA    DA    SA
+	 */
+	memcpy(tmp.h_dest, ieee80211_get_DA(hdr), ETH_ALEN);
+	memcpy(tmp.h_source, ieee80211_get_SA(hdr), ETH_ALEN);
+
+	if (iftype == NL80211_IFTYPE_MESH_POINT)
+		skb_copy_bits(skb, hdrlen, &mesh_flags, 1);
+
+	mesh_flags &= MESH_FLAGS_AE;
+
+	switch (hdr->frame_control &
+		cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) {
+	case cpu_to_le16(IEEE80211_FCTL_TODS):
+		if (unlikely(iftype != NL80211_IFTYPE_AP &&
+			     iftype != NL80211_IFTYPE_AP_VLAN &&
+			     iftype != NL80211_IFTYPE_P2P_GO))
+			return -1;
+		break;
+	case cpu_to_le16(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS):
+		if (unlikely(iftype != NL80211_IFTYPE_WDS &&
+			     iftype != NL80211_IFTYPE_MESH_POINT &&
+			     iftype != NL80211_IFTYPE_AP_VLAN &&
+			     iftype != NL80211_IFTYPE_STATION))
+			return -1;
+		if (iftype == NL80211_IFTYPE_MESH_POINT) {
+			if (mesh_flags == MESH_FLAGS_AE_A4)
+				return -1;
+			if (mesh_flags == MESH_FLAGS_AE_A5_A6) {
+				skb_copy_bits(skb, hdrlen +
+					offsetof(struct ieee80211s_hdr, eaddr1),
+					tmp.h_dest, 2 * ETH_ALEN);
+			}
+			hdrlen += __ieee80211_get_mesh_hdrlen(mesh_flags);
+		}
+		break;
+	case cpu_to_le16(IEEE80211_FCTL_FROMDS):
+		if ((iftype != NL80211_IFTYPE_STATION &&
+		     iftype != NL80211_IFTYPE_P2P_CLIENT &&
+		     iftype != NL80211_IFTYPE_MESH_POINT) ||
+		    (is_multicast_ether_addr(tmp.h_dest) &&
+		     ether_addr_equal(tmp.h_source, addr)))
+			return -1;
+		if (iftype == NL80211_IFTYPE_MESH_POINT) {
+			if (mesh_flags == MESH_FLAGS_AE_A5_A6)
+				return -1;
+			if (mesh_flags == MESH_FLAGS_AE_A4)
+				skb_copy_bits(skb, hdrlen +
+					offsetof(struct ieee80211s_hdr, eaddr1),
+					tmp.h_source, ETH_ALEN);
+			hdrlen += __ieee80211_get_mesh_hdrlen(mesh_flags);
+		}
+		break;
+	case cpu_to_le16(0):
+		if (iftype != NL80211_IFTYPE_ADHOC &&
+		    iftype != NL80211_IFTYPE_STATION &&
+		    iftype != NL80211_IFTYPE_OCB)
+				return -1;
+		break;
+	}
+
+	skb_copy_bits(skb, hdrlen, &payload, sizeof(payload));
+	tmp.h_proto = payload.proto;
+
+	if (likely((!is_amsdu && ether_addr_equal(payload.hdr, rfc1042_header) &&
+		    tmp.h_proto != htons(ETH_P_AARP) &&
+		    tmp.h_proto != htons(ETH_P_IPX)) ||
+		   ether_addr_equal(payload.hdr, bridge_tunnel_header)))
+		/* remove RFC1042 or Bridge-Tunnel encapsulation and
+		 * replace EtherType */
+		hdrlen += ETH_ALEN + 2;
+	else
+		tmp.h_proto = htons(skb->len - hdrlen);
+
+	pskb_pull(skb, hdrlen);
+
+	if (!ehdr)
+		ehdr = skb_push(skb, sizeof(struct ethhdr));
+	memcpy(ehdr, &tmp, sizeof(tmp));
+
+	return 0;
+}
+EXPORT_SYMBOL(ieee80211_data_to_8023_exthdr);
+
+static void
+__frame_add_frag(struct sk_buff *skb, struct page *page,
+		 void *ptr, int len, int size)
+{
+	struct skb_shared_info *sh = skb_shinfo(skb);
+	int page_offset;
+
+	get_page(page);
+	page_offset = ptr - page_address(page);
+	skb_add_rx_frag(skb, sh->nr_frags, page, page_offset, len, size);
+}
+
+static void
+__ieee80211_amsdu_copy_frag(struct sk_buff *skb, struct sk_buff *frame,
+			    int offset, int len)
+{
+	struct skb_shared_info *sh = skb_shinfo(skb);
+	const skb_frag_t *frag = &sh->frags[0];
+	struct page *frag_page;
+	void *frag_ptr;
+	int frag_len, frag_size;
+	int head_size = skb->len - skb->data_len;
+	int cur_len;
+
+	frag_page = virt_to_head_page(skb->head);
+	frag_ptr = skb->data;
+	frag_size = head_size;
+
+	while (offset >= frag_size) {
+		offset -= frag_size;
+		frag_page = skb_frag_page(frag);
+		frag_ptr = skb_frag_address(frag);
+		frag_size = skb_frag_size(frag);
+		frag++;
+	}
+
+	frag_ptr += offset;
+	frag_len = frag_size - offset;
+
+	cur_len = min(len, frag_len);
+
+	__frame_add_frag(frame, frag_page, frag_ptr, cur_len, frag_size);
+	len -= cur_len;
+
+	while (len > 0) {
+		frag_len = skb_frag_size(frag);
+		cur_len = min(len, frag_len);
+		__frame_add_frag(frame, skb_frag_page(frag),
+				 skb_frag_address(frag), cur_len, frag_len);
+		len -= cur_len;
+		frag++;
+	}
+}
+
+static struct sk_buff *
+__ieee80211_amsdu_copy(struct sk_buff *skb, unsigned int hlen,
+		       int offset, int len, bool reuse_frag)
+{
+	struct sk_buff *frame;
+	int cur_len = len;
+
+	if (skb->len - offset < len)
+		return NULL;
+
+	/*
+	 * When reusing framents, copy some data to the head to simplify
+	 * ethernet header handling and speed up protocol header processing
+	 * in the stack later.
+	 */
+	if (reuse_frag)
+		cur_len = min_t(int, len, 32);
+
+	/*
+	 * Allocate and reserve two bytes more for payload
+	 * alignment since sizeof(struct ethhdr) is 14.
+	 */
+	frame = dev_alloc_skb(hlen + sizeof(struct ethhdr) + 2 + cur_len);
+	if (!frame)
+		return NULL;
+
+	skb_reserve(frame, hlen + sizeof(struct ethhdr) + 2);
+	skb_copy_bits(skb, offset, skb_put(frame, cur_len), cur_len);
+
+	len -= cur_len;
+	if (!len)
+		return frame;
+
+	offset += cur_len;
+	__ieee80211_amsdu_copy_frag(skb, frame, offset, len);
+
+	return frame;
+}
+
+void ieee80211_amsdu_to_8023s(struct sk_buff *skb, struct sk_buff_head *list,
+			      const u8 *addr, enum nl80211_iftype iftype,
+			      const unsigned int extra_headroom,
+			      const u8 *check_da, const u8 *check_sa)
+{
+	unsigned int hlen = ALIGN(extra_headroom, 4);
+	struct sk_buff *frame = NULL;
+	u16 ethertype;
+	u8 *payload;
+	int offset = 0, remaining;
+	struct ethhdr eth;
+	bool reuse_frag = skb->head_frag && !skb_has_frag_list(skb);
+	bool reuse_skb = false;
+	bool last = false;
+
+	while (!last) {
+		unsigned int subframe_len;
+		int len;
+		u8 padding;
+
+		skb_copy_bits(skb, offset, &eth, sizeof(eth));
+		len = ntohs(eth.h_proto);
+		subframe_len = sizeof(struct ethhdr) + len;
+		padding = (4 - subframe_len) & 0x3;
+
+		/* the last MSDU has no padding */
+		remaining = skb->len - offset;
+		if (subframe_len > remaining)
+			goto purge;
+		/* mitigate A-MSDU aggregation injection attacks */
+		if (ether_addr_equal(eth.h_dest, rfc1042_header))
+			goto purge;
+
+		offset += sizeof(struct ethhdr);
+		last = remaining <= subframe_len + padding;
+
+		/* FIXME: should we really accept multicast DA? */
+		if ((check_da && !is_multicast_ether_addr(eth.h_dest) &&
+		     !ether_addr_equal(check_da, eth.h_dest)) ||
+		    (check_sa && !ether_addr_equal(check_sa, eth.h_source))) {
+			offset += len + padding;
+			continue;
+		}
+
+		/* reuse skb for the last subframe */
+		if (!skb_is_nonlinear(skb) && !reuse_frag && last) {
+			skb_pull(skb, offset);
+			frame = skb;
+			reuse_skb = true;
+		} else {
+			frame = __ieee80211_amsdu_copy(skb, hlen, offset, len,
+						       reuse_frag);
+			if (!frame)
+				goto purge;
+
+			offset += len + padding;
+		}
+
+		skb_reset_network_header(frame);
+		frame->dev = skb->dev;
+		frame->priority = skb->priority;
+
+		payload = frame->data;
+		ethertype = (payload[6] << 8) | payload[7];
+		if (likely((ether_addr_equal(payload, rfc1042_header) &&
+			    ethertype != ETH_P_AARP && ethertype != ETH_P_IPX) ||
+			   ether_addr_equal(payload, bridge_tunnel_header))) {
+			eth.h_proto = htons(ethertype);
+			skb_pull(frame, ETH_ALEN + 2);
+		}
+
+		memcpy(skb_push(frame, sizeof(eth)), &eth, sizeof(eth));
+		__skb_queue_tail(list, frame);
+	}
+
+	if (!reuse_skb)
+		dev_kfree_skb(skb);
+
+	return;
+
+ purge:
+	__skb_queue_purge(list);
+	dev_kfree_skb(skb);
+}
+EXPORT_SYMBOL(ieee80211_amsdu_to_8023s);
+
+/* Given a data frame determine the 802.1p/1d tag to use. */
+unsigned int cfg80211_classify8021d(struct sk_buff *skb,
+				    struct cfg80211_qos_map *qos_map)
+{
+	unsigned int dscp;
+	unsigned char vlan_priority;
+
+	/* skb->priority values from 256->263 are magic values to
+	 * directly indicate a specific 802.1d priority.  This is used
+	 * to allow 802.1d priority to be passed directly in from VLAN
+	 * tags, etc.
+	 */
+	if (skb->priority >= 256 && skb->priority <= 263)
+		return skb->priority - 256;
+
+	if (skb_vlan_tag_present(skb)) {
+		vlan_priority = (skb_vlan_tag_get(skb) & VLAN_PRIO_MASK)
+			>> VLAN_PRIO_SHIFT;
+		if (vlan_priority > 0)
+			return vlan_priority;
+	}
+
+	switch (skb->protocol) {
+	case htons(ETH_P_IP):
+		dscp = ipv4_get_dsfield(ip_hdr(skb)) & 0xfc;
+		break;
+	case htons(ETH_P_IPV6):
+		dscp = ipv6_get_dsfield(ipv6_hdr(skb)) & 0xfc;
+		break;
+	case htons(ETH_P_MPLS_UC):
+	case htons(ETH_P_MPLS_MC): {
+		struct mpls_label mpls_tmp, *mpls;
+
+		mpls = skb_header_pointer(skb, sizeof(struct ethhdr),
+					  sizeof(*mpls), &mpls_tmp);
+		if (!mpls)
+			return 0;
+
+		return (ntohl(mpls->entry) & MPLS_LS_TC_MASK)
+			>> MPLS_LS_TC_SHIFT;
+	}
+	case htons(ETH_P_80221):
+		/* 802.21 is always network control traffic */
+		return 7;
+	default:
+		return 0;
+	}
+
+	if (qos_map) {
+		unsigned int i, tmp_dscp = dscp >> 2;
+
+		for (i = 0; i < qos_map->num_des; i++) {
+			if (tmp_dscp == qos_map->dscp_exception[i].dscp)
+				return qos_map->dscp_exception[i].up;
+		}
+
+		for (i = 0; i < 8; i++) {
+			if (tmp_dscp >= qos_map->up[i].low &&
+			    tmp_dscp <= qos_map->up[i].high)
+				return i;
+		}
+	}
+
+	return dscp >> 5;
+}
+EXPORT_SYMBOL(cfg80211_classify8021d);
+
+const u8 *ieee80211_bss_get_ie(struct cfg80211_bss *bss, u8 ie)
+{
+	const struct cfg80211_bss_ies *ies;
+
+	ies = rcu_dereference(bss->ies);
+	if (!ies)
+		return NULL;
+
+	return cfg80211_find_ie(ie, ies->data, ies->len);
+}
+EXPORT_SYMBOL(ieee80211_bss_get_ie);
+
+void cfg80211_upload_connect_keys(struct wireless_dev *wdev)
+{
+	struct cfg80211_registered_device *rdev = wiphy_to_rdev(wdev->wiphy);
+	struct net_device *dev = wdev->netdev;
+	int i;
+
+	if (!wdev->connect_keys)
+		return;
+
+	for (i = 0; i < CFG80211_MAX_WEP_KEYS; i++) {
+		if (!wdev->connect_keys->params[i].cipher)
+			continue;
+		if (rdev_add_key(rdev, dev, i, false, NULL,
+				 &wdev->connect_keys->params[i])) {
+			netdev_err(dev, "failed to set key %d\n", i);
+			continue;
+		}
+		if (wdev->connect_keys->def == i &&
+		    rdev_set_default_key(rdev, dev, i, true, true)) {
+			netdev_err(dev, "failed to set defkey %d\n", i);
+			continue;
+		}
+	}
+
+	kzfree(wdev->connect_keys);
+	wdev->connect_keys = NULL;
+}
+
+void cfg80211_process_wdev_events(struct wireless_dev *wdev)
+{
+	struct cfg80211_event *ev;
+	unsigned long flags;
+
+	spin_lock_irqsave(&wdev->event_lock, flags);
+	while (!list_empty(&wdev->event_list)) {
+		ev = list_first_entry(&wdev->event_list,
+				      struct cfg80211_event, list);
+		list_del(&ev->list);
+		spin_unlock_irqrestore(&wdev->event_lock, flags);
+
+		wdev_lock(wdev);
+		switch (ev->type) {
+		case EVENT_CONNECT_RESULT:
+			__cfg80211_connect_result(
+				wdev->netdev,
+				&ev->cr,
+				ev->cr.status == WLAN_STATUS_SUCCESS);
+			break;
+		case EVENT_ROAMED:
+			__cfg80211_roamed(wdev, &ev->rm);
+			break;
+		case EVENT_DISCONNECTED:
+			__cfg80211_disconnected(wdev->netdev,
+						ev->dc.ie, ev->dc.ie_len,
+						ev->dc.reason,
+						!ev->dc.locally_generated);
+			break;
+		case EVENT_IBSS_JOINED:
+			__cfg80211_ibss_joined(wdev->netdev, ev->ij.bssid,
+					       ev->ij.channel);
+			break;
+		case EVENT_STOPPED:
+			__cfg80211_leave(wiphy_to_rdev(wdev->wiphy), wdev);
+			break;
+		case EVENT_PORT_AUTHORIZED:
+			__cfg80211_port_authorized(wdev, ev->pa.bssid);
+			break;
+		}
+		wdev_unlock(wdev);
+
+		kfree(ev);
+
+		spin_lock_irqsave(&wdev->event_lock, flags);
+	}
+	spin_unlock_irqrestore(&wdev->event_lock, flags);
+}
+
+void cfg80211_process_rdev_events(struct cfg80211_registered_device *rdev)
+{
+	struct wireless_dev *wdev;
+
+	ASSERT_RTNL();
+
+	list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list)
+		cfg80211_process_wdev_events(wdev);
+}
+
+int cfg80211_change_iface(struct cfg80211_registered_device *rdev,
+			  struct net_device *dev, enum nl80211_iftype ntype,
+			  struct vif_params *params)
+{
+	int err;
+	enum nl80211_iftype otype = dev->ieee80211_ptr->iftype;
+
+	ASSERT_RTNL();
+
+	/* don't support changing VLANs, you just re-create them */
+	if (otype == NL80211_IFTYPE_AP_VLAN)
+		return -EOPNOTSUPP;
+
+	/* cannot change into P2P device or NAN */
+	if (ntype == NL80211_IFTYPE_P2P_DEVICE ||
+	    ntype == NL80211_IFTYPE_NAN)
+		return -EOPNOTSUPP;
+
+	if (!rdev->ops->change_virtual_intf ||
+	    !(rdev->wiphy.interface_modes & (1 << ntype)))
+		return -EOPNOTSUPP;
+
+	/* if it's part of a bridge, reject changing type to station/ibss */
+	if ((dev->priv_flags & IFF_BRIDGE_PORT) &&
+	    (ntype == NL80211_IFTYPE_ADHOC ||
+	     ntype == NL80211_IFTYPE_STATION ||
+	     ntype == NL80211_IFTYPE_P2P_CLIENT))
+		return -EBUSY;
+
+	if (ntype != otype) {
+		dev->ieee80211_ptr->use_4addr = false;
+		dev->ieee80211_ptr->mesh_id_up_len = 0;
+		wdev_lock(dev->ieee80211_ptr);
+		rdev_set_qos_map(rdev, dev, NULL);
+		wdev_unlock(dev->ieee80211_ptr);
+
+		switch (otype) {
+		case NL80211_IFTYPE_AP:
+		case NL80211_IFTYPE_P2P_GO:
+			cfg80211_stop_ap(rdev, dev, true);
+			break;
+		case NL80211_IFTYPE_ADHOC:
+			cfg80211_leave_ibss(rdev, dev, false);
+			break;
+		case NL80211_IFTYPE_STATION:
+		case NL80211_IFTYPE_P2P_CLIENT:
+			wdev_lock(dev->ieee80211_ptr);
+			cfg80211_disconnect(rdev, dev,
+					    WLAN_REASON_DEAUTH_LEAVING, true);
+			wdev_unlock(dev->ieee80211_ptr);
+			break;
+		case NL80211_IFTYPE_MESH_POINT:
+			/* mesh should be handled? */
+			break;
+		case NL80211_IFTYPE_OCB:
+			cfg80211_leave_ocb(rdev, dev);
+			break;
+		default:
+			break;
+		}
+
+		cfg80211_process_rdev_events(rdev);
+		cfg80211_mlme_purge_registrations(dev->ieee80211_ptr);
+	}
+
+	err = rdev_change_virtual_intf(rdev, dev, ntype, params);
+
+	WARN_ON(!err && dev->ieee80211_ptr->iftype != ntype);
+
+	if (!err && params && params->use_4addr != -1)
+		dev->ieee80211_ptr->use_4addr = params->use_4addr;
+
+	if (!err) {
+		dev->priv_flags &= ~IFF_DONT_BRIDGE;
+		switch (ntype) {
+		case NL80211_IFTYPE_STATION:
+			if (dev->ieee80211_ptr->use_4addr)
+				break;
+			/* fall through */
+		case NL80211_IFTYPE_OCB:
+		case NL80211_IFTYPE_P2P_CLIENT:
+		case NL80211_IFTYPE_ADHOC:
+			dev->priv_flags |= IFF_DONT_BRIDGE;
+			break;
+		case NL80211_IFTYPE_P2P_GO:
+		case NL80211_IFTYPE_AP:
+		case NL80211_IFTYPE_AP_VLAN:
+		case NL80211_IFTYPE_WDS:
+		case NL80211_IFTYPE_MESH_POINT:
+			/* bridging OK */
+			break;
+		case NL80211_IFTYPE_MONITOR:
+			/* monitor can't bridge anyway */
+			break;
+		case NL80211_IFTYPE_UNSPECIFIED:
+		case NUM_NL80211_IFTYPES:
+			/* not happening */
+			break;
+		case NL80211_IFTYPE_P2P_DEVICE:
+		case NL80211_IFTYPE_NAN:
+			WARN_ON(1);
+			break;
+		}
+	}
+
+	if (!err && ntype != otype && netif_running(dev)) {
+		cfg80211_update_iface_num(rdev, ntype, 1);
+		cfg80211_update_iface_num(rdev, otype, -1);
+	}
+
+	return err;
+}
+
+static u32 cfg80211_calculate_bitrate_ht(struct rate_info *rate)
+{
+	int modulation, streams, bitrate;
+
+	/* the formula below does only work for MCS values smaller than 32 */
+	if (WARN_ON_ONCE(rate->mcs >= 32))
+		return 0;
+
+	modulation = rate->mcs & 7;
+	streams = (rate->mcs >> 3) + 1;
+
+	bitrate = (rate->bw == RATE_INFO_BW_40) ? 13500000 : 6500000;
+
+	if (modulation < 4)
+		bitrate *= (modulation + 1);
+	else if (modulation == 4)
+		bitrate *= (modulation + 2);
+	else
+		bitrate *= (modulation + 3);
+
+	bitrate *= streams;
+
+	if (rate->flags & RATE_INFO_FLAGS_SHORT_GI)
+		bitrate = (bitrate / 9) * 10;
+
+	/* do NOT round down here */
+	return (bitrate + 50000) / 100000;
+}
+
+static u32 cfg80211_calculate_bitrate_60g(struct rate_info *rate)
+{
+	static const u32 __mcs2bitrate[] = {
+		/* control PHY */
+		[0] =   275,
+		/* SC PHY */
+		[1] =  3850,
+		[2] =  7700,
+		[3] =  9625,
+		[4] = 11550,
+		[5] = 12512, /* 1251.25 mbps */
+		[6] = 15400,
+		[7] = 19250,
+		[8] = 23100,
+		[9] = 25025,
+		[10] = 30800,
+		[11] = 38500,
+		[12] = 46200,
+		/* OFDM PHY */
+		[13] =  6930,
+		[14] =  8662, /* 866.25 mbps */
+		[15] = 13860,
+		[16] = 17325,
+		[17] = 20790,
+		[18] = 27720,
+		[19] = 34650,
+		[20] = 41580,
+		[21] = 45045,
+		[22] = 51975,
+		[23] = 62370,
+		[24] = 67568, /* 6756.75 mbps */
+		/* LP-SC PHY */
+		[25] =  6260,
+		[26] =  8340,
+		[27] = 11120,
+		[28] = 12510,
+		[29] = 16680,
+		[30] = 22240,
+		[31] = 25030,
+	};
+
+	if (WARN_ON_ONCE(rate->mcs >= ARRAY_SIZE(__mcs2bitrate)))
+		return 0;
+
+	return __mcs2bitrate[rate->mcs];
+}
+
+static u32 cfg80211_calculate_bitrate_vht(struct rate_info *rate)
+{
+	static const u32 base[4][10] = {
+		{   6500000,
+		   13000000,
+		   19500000,
+		   26000000,
+		   39000000,
+		   52000000,
+		   58500000,
+		   65000000,
+		   78000000,
+		/* not in the spec, but some devices use this: */
+		   86500000,
+		},
+		{  13500000,
+		   27000000,
+		   40500000,
+		   54000000,
+		   81000000,
+		  108000000,
+		  121500000,
+		  135000000,
+		  162000000,
+		  180000000,
+		},
+		{  29300000,
+		   58500000,
+		   87800000,
+		  117000000,
+		  175500000,
+		  234000000,
+		  263300000,
+		  292500000,
+		  351000000,
+		  390000000,
+		},
+		{  58500000,
+		  117000000,
+		  175500000,
+		  234000000,
+		  351000000,
+		  468000000,
+		  526500000,
+		  585000000,
+		  702000000,
+		  780000000,
+		},
+	};
+	u32 bitrate;
+	int idx;
+
+	if (rate->mcs > 9)
+		goto warn;
+
+	switch (rate->bw) {
+	case RATE_INFO_BW_160:
+		idx = 3;
+		break;
+	case RATE_INFO_BW_80:
+		idx = 2;
+		break;
+	case RATE_INFO_BW_40:
+		idx = 1;
+		break;
+	case RATE_INFO_BW_5:
+	case RATE_INFO_BW_10:
+	default:
+		goto warn;
+	case RATE_INFO_BW_20:
+		idx = 0;
+	}
+
+	bitrate = base[idx][rate->mcs];
+	bitrate *= rate->nss;
+
+	if (rate->flags & RATE_INFO_FLAGS_SHORT_GI)
+		bitrate = (bitrate / 9) * 10;
+
+	/* do NOT round down here */
+	return (bitrate + 50000) / 100000;
+ warn:
+	WARN_ONCE(1, "invalid rate bw=%d, mcs=%d, nss=%d\n",
+		  rate->bw, rate->mcs, rate->nss);
+	return 0;
+}
+
+static u32 cfg80211_calculate_bitrate_he(struct rate_info *rate)
+{
+#define SCALE 2048
+	u16 mcs_divisors[12] = {
+		34133, /* 16.666666... */
+		17067, /*  8.333333... */
+		11378, /*  5.555555... */
+		 8533, /*  4.166666... */
+		 5689, /*  2.777777... */
+		 4267, /*  2.083333... */
+		 3923, /*  1.851851... */
+		 3413, /*  1.666666... */
+		 2844, /*  1.388888... */
+		 2560, /*  1.250000... */
+		 2276, /*  1.111111... */
+		 2048, /*  1.000000... */
+	};
+	u32 rates_160M[3] = { 960777777, 907400000, 816666666 };
+	u32 rates_969[3] =  { 480388888, 453700000, 408333333 };
+	u32 rates_484[3] =  { 229411111, 216666666, 195000000 };
+	u32 rates_242[3] =  { 114711111, 108333333,  97500000 };
+	u32 rates_106[3] =  {  40000000,  37777777,  34000000 };
+	u32 rates_52[3]  =  {  18820000,  17777777,  16000000 };
+	u32 rates_26[3]  =  {   9411111,   8888888,   8000000 };
+	u64 tmp;
+	u32 result;
+
+	if (WARN_ON_ONCE(rate->mcs > 11))
+		return 0;
+
+	if (WARN_ON_ONCE(rate->he_gi > NL80211_RATE_INFO_HE_GI_3_2))
+		return 0;
+	if (WARN_ON_ONCE(rate->he_ru_alloc >
+			 NL80211_RATE_INFO_HE_RU_ALLOC_2x996))
+		return 0;
+	if (WARN_ON_ONCE(rate->nss < 1 || rate->nss > 8))
+		return 0;
+
+	if (rate->bw == RATE_INFO_BW_160)
+		result = rates_160M[rate->he_gi];
+	else if (rate->bw == RATE_INFO_BW_80 ||
+		 (rate->bw == RATE_INFO_BW_HE_RU &&
+		  rate->he_ru_alloc == NL80211_RATE_INFO_HE_RU_ALLOC_996))
+		result = rates_969[rate->he_gi];
+	else if (rate->bw == RATE_INFO_BW_40 ||
+		 (rate->bw == RATE_INFO_BW_HE_RU &&
+		  rate->he_ru_alloc == NL80211_RATE_INFO_HE_RU_ALLOC_484))
+		result = rates_484[rate->he_gi];
+	else if (rate->bw == RATE_INFO_BW_20 ||
+		 (rate->bw == RATE_INFO_BW_HE_RU &&
+		  rate->he_ru_alloc == NL80211_RATE_INFO_HE_RU_ALLOC_242))
+		result = rates_242[rate->he_gi];
+	else if (rate->bw == RATE_INFO_BW_HE_RU &&
+		 rate->he_ru_alloc == NL80211_RATE_INFO_HE_RU_ALLOC_106)
+		result = rates_106[rate->he_gi];
+	else if (rate->bw == RATE_INFO_BW_HE_RU &&
+		 rate->he_ru_alloc == NL80211_RATE_INFO_HE_RU_ALLOC_52)
+		result = rates_52[rate->he_gi];
+	else if (rate->bw == RATE_INFO_BW_HE_RU &&
+		 rate->he_ru_alloc == NL80211_RATE_INFO_HE_RU_ALLOC_26)
+		result = rates_26[rate->he_gi];
+	else if (WARN(1, "invalid HE MCS: bw:%d, ru:%d\n",
+		      rate->bw, rate->he_ru_alloc))
+		return 0;
+
+	/* now scale to the appropriate MCS */
+	tmp = result;
+	tmp *= SCALE;
+	do_div(tmp, mcs_divisors[rate->mcs]);
+	result = tmp;
+
+	/* and take NSS, DCM into account */
+	result = (result * rate->nss) / 8;
+	if (rate->he_dcm)
+		result /= 2;
+
+	return result / 10000;
+}
+
+u32 cfg80211_calculate_bitrate(struct rate_info *rate)
+{
+	if (rate->flags & RATE_INFO_FLAGS_MCS)
+		return cfg80211_calculate_bitrate_ht(rate);
+	if (rate->flags & RATE_INFO_FLAGS_60G)
+		return cfg80211_calculate_bitrate_60g(rate);
+	if (rate->flags & RATE_INFO_FLAGS_VHT_MCS)
+		return cfg80211_calculate_bitrate_vht(rate);
+	if (rate->flags & RATE_INFO_FLAGS_HE_MCS)
+		return cfg80211_calculate_bitrate_he(rate);
+
+	return rate->legacy;
+}
+EXPORT_SYMBOL(cfg80211_calculate_bitrate);
+
+int cfg80211_get_p2p_attr(const u8 *ies, unsigned int len,
+			  enum ieee80211_p2p_attr_id attr,
+			  u8 *buf, unsigned int bufsize)
+{
+	u8 *out = buf;
+	u16 attr_remaining = 0;
+	bool desired_attr = false;
+	u16 desired_len = 0;
+
+	while (len > 0) {
+		unsigned int iedatalen;
+		unsigned int copy;
+		const u8 *iedata;
+
+		if (len < 2)
+			return -EILSEQ;
+		iedatalen = ies[1];
+		if (iedatalen + 2 > len)
+			return -EILSEQ;
+
+		if (ies[0] != WLAN_EID_VENDOR_SPECIFIC)
+			goto cont;
+
+		if (iedatalen < 4)
+			goto cont;
+
+		iedata = ies + 2;
+
+		/* check WFA OUI, P2P subtype */
+		if (iedata[0] != 0x50 || iedata[1] != 0x6f ||
+		    iedata[2] != 0x9a || iedata[3] != 0x09)
+			goto cont;
+
+		iedatalen -= 4;
+		iedata += 4;
+
+		/* check attribute continuation into this IE */
+		copy = min_t(unsigned int, attr_remaining, iedatalen);
+		if (copy && desired_attr) {
+			desired_len += copy;
+			if (out) {
+				memcpy(out, iedata, min(bufsize, copy));
+				out += min(bufsize, copy);
+				bufsize -= min(bufsize, copy);
+			}
+
+
+			if (copy == attr_remaining)
+				return desired_len;
+		}
+
+		attr_remaining -= copy;
+		if (attr_remaining)
+			goto cont;
+
+		iedatalen -= copy;
+		iedata += copy;
+
+		while (iedatalen > 0) {
+			u16 attr_len;
+
+			/* P2P attribute ID & size must fit */
+			if (iedatalen < 3)
+				return -EILSEQ;
+			desired_attr = iedata[0] == attr;
+			attr_len = get_unaligned_le16(iedata + 1);
+			iedatalen -= 3;
+			iedata += 3;
+
+			copy = min_t(unsigned int, attr_len, iedatalen);
+
+			if (desired_attr) {
+				desired_len += copy;
+				if (out) {
+					memcpy(out, iedata, min(bufsize, copy));
+					out += min(bufsize, copy);
+					bufsize -= min(bufsize, copy);
+				}
+
+				if (copy == attr_len)
+					return desired_len;
+			}
+
+			iedata += copy;
+			iedatalen -= copy;
+			attr_remaining = attr_len - copy;
+		}
+
+ cont:
+		len -= ies[1] + 2;
+		ies += ies[1] + 2;
+	}
+
+	if (attr_remaining && desired_attr)
+		return -EILSEQ;
+
+	return -ENOENT;
+}
+EXPORT_SYMBOL(cfg80211_get_p2p_attr);
+
+static bool ieee80211_id_in_list(const u8 *ids, int n_ids, u8 id, bool id_ext)
+{
+	int i;
+
+	/* Make sure array values are legal */
+	if (WARN_ON(ids[n_ids - 1] == WLAN_EID_EXTENSION))
+		return false;
+
+	i = 0;
+	while (i < n_ids) {
+		if (ids[i] == WLAN_EID_EXTENSION) {
+			if (id_ext && (ids[i + 1] == id))
+				return true;
+
+			i += 2;
+			continue;
+		}
+
+		if (ids[i] == id && !id_ext)
+			return true;
+
+		i++;
+	}
+	return false;
+}
+
+static size_t skip_ie(const u8 *ies, size_t ielen, size_t pos)
+{
+	/* we assume a validly formed IEs buffer */
+	u8 len = ies[pos + 1];
+
+	pos += 2 + len;
+
+	/* the IE itself must have 255 bytes for fragments to follow */
+	if (len < 255)
+		return pos;
+
+	while (pos < ielen && ies[pos] == WLAN_EID_FRAGMENT) {
+		len = ies[pos + 1];
+		pos += 2 + len;
+	}
+
+	return pos;
+}
+
+size_t ieee80211_ie_split_ric(const u8 *ies, size_t ielen,
+			      const u8 *ids, int n_ids,
+			      const u8 *after_ric, int n_after_ric,
+			      size_t offset)
+{
+	size_t pos = offset;
+
+	while (pos < ielen) {
+		u8 ext = 0;
+
+		if (ies[pos] == WLAN_EID_EXTENSION)
+			ext = 2;
+		if ((pos + ext) >= ielen)
+			break;
+
+		if (!ieee80211_id_in_list(ids, n_ids, ies[pos + ext],
+					  ies[pos] == WLAN_EID_EXTENSION))
+			break;
+
+		if (ies[pos] == WLAN_EID_RIC_DATA && n_after_ric) {
+			pos = skip_ie(ies, ielen, pos);
+
+			while (pos < ielen) {
+				if (ies[pos] == WLAN_EID_EXTENSION)
+					ext = 2;
+				else
+					ext = 0;
+
+				if ((pos + ext) >= ielen)
+					break;
+
+				if (!ieee80211_id_in_list(after_ric,
+							  n_after_ric,
+							  ies[pos + ext],
+							  ext == 2))
+					pos = skip_ie(ies, ielen, pos);
+				else
+					break;
+			}
+		} else {
+			pos = skip_ie(ies, ielen, pos);
+		}
+	}
+
+	return pos;
+}
+EXPORT_SYMBOL(ieee80211_ie_split_ric);
+
+bool ieee80211_operating_class_to_band(u8 operating_class,
+				       enum nl80211_band *band)
+{
+	switch (operating_class) {
+	case 112:
+	case 115 ... 127:
+	case 128 ... 130:
+		*band = NL80211_BAND_5GHZ;
+		return true;
+	case 81:
+	case 82:
+	case 83:
+	case 84:
+		*band = NL80211_BAND_2GHZ;
+		return true;
+	case 180:
+		*band = NL80211_BAND_60GHZ;
+		return true;
+	}
+
+	return false;
+}
+EXPORT_SYMBOL(ieee80211_operating_class_to_band);
+
+bool ieee80211_chandef_to_operating_class(struct cfg80211_chan_def *chandef,
+					  u8 *op_class)
+{
+	u8 vht_opclass;
+	u32 freq = chandef->center_freq1;
+
+	if (freq >= 2412 && freq <= 2472) {
+		if (chandef->width > NL80211_CHAN_WIDTH_40)
+			return false;
+
+		/* 2.407 GHz, channels 1..13 */
+		if (chandef->width == NL80211_CHAN_WIDTH_40) {
+			if (freq > chandef->chan->center_freq)
+				*op_class = 83; /* HT40+ */
+			else
+				*op_class = 84; /* HT40- */
+		} else {
+			*op_class = 81;
+		}
+
+		return true;
+	}
+
+	if (freq == 2484) {
+		if (chandef->width > NL80211_CHAN_WIDTH_40)
+			return false;
+
+		*op_class = 82; /* channel 14 */
+		return true;
+	}
+
+	switch (chandef->width) {
+	case NL80211_CHAN_WIDTH_80:
+		vht_opclass = 128;
+		break;
+	case NL80211_CHAN_WIDTH_160:
+		vht_opclass = 129;
+		break;
+	case NL80211_CHAN_WIDTH_80P80:
+		vht_opclass = 130;
+		break;
+	case NL80211_CHAN_WIDTH_10:
+	case NL80211_CHAN_WIDTH_5:
+		return false; /* unsupported for now */
+	default:
+		vht_opclass = 0;
+		break;
+	}
+
+	/* 5 GHz, channels 36..48 */
+	if (freq >= 5180 && freq <= 5240) {
+		if (vht_opclass) {
+			*op_class = vht_opclass;
+		} else if (chandef->width == NL80211_CHAN_WIDTH_40) {
+			if (freq > chandef->chan->center_freq)
+				*op_class = 116;
+			else
+				*op_class = 117;
+		} else {
+			*op_class = 115;
+		}
+
+		return true;
+	}
+
+	/* 5 GHz, channels 52..64 */
+	if (freq >= 5260 && freq <= 5320) {
+		if (vht_opclass) {
+			*op_class = vht_opclass;
+		} else if (chandef->width == NL80211_CHAN_WIDTH_40) {
+			if (freq > chandef->chan->center_freq)
+				*op_class = 119;
+			else
+				*op_class = 120;
+		} else {
+			*op_class = 118;
+		}
+
+		return true;
+	}
+
+	/* 5 GHz, channels 100..144 */
+	if (freq >= 5500 && freq <= 5720) {
+		if (vht_opclass) {
+			*op_class = vht_opclass;
+		} else if (chandef->width == NL80211_CHAN_WIDTH_40) {
+			if (freq > chandef->chan->center_freq)
+				*op_class = 122;
+			else
+				*op_class = 123;
+		} else {
+			*op_class = 121;
+		}
+
+		return true;
+	}
+
+	/* 5 GHz, channels 149..169 */
+	if (freq >= 5745 && freq <= 5845) {
+		if (vht_opclass) {
+			*op_class = vht_opclass;
+		} else if (chandef->width == NL80211_CHAN_WIDTH_40) {
+			if (freq > chandef->chan->center_freq)
+				*op_class = 126;
+			else
+				*op_class = 127;
+		} else if (freq <= 5805) {
+			*op_class = 124;
+		} else {
+			*op_class = 125;
+		}
+
+		return true;
+	}
+
+	/* 56.16 GHz, channel 1..4 */
+	if (freq >= 56160 + 2160 * 1 && freq <= 56160 + 2160 * 4) {
+		if (chandef->width >= NL80211_CHAN_WIDTH_40)
+			return false;
+
+		*op_class = 180;
+		return true;
+	}
+
+	/* not supported yet */
+	return false;
+}
+EXPORT_SYMBOL(ieee80211_chandef_to_operating_class);
+
+static void cfg80211_calculate_bi_data(struct wiphy *wiphy, u32 new_beacon_int,
+				       u32 *beacon_int_gcd,
+				       bool *beacon_int_different)
+{
+	struct wireless_dev *wdev;
+
+	*beacon_int_gcd = 0;
+	*beacon_int_different = false;
+
+	list_for_each_entry(wdev, &wiphy->wdev_list, list) {
+		if (!wdev->beacon_interval)
+			continue;
+
+		if (!*beacon_int_gcd) {
+			*beacon_int_gcd = wdev->beacon_interval;
+			continue;
+		}
+
+		if (wdev->beacon_interval == *beacon_int_gcd)
+			continue;
+
+		*beacon_int_different = true;
+		*beacon_int_gcd = gcd(*beacon_int_gcd, wdev->beacon_interval);
+	}
+
+	if (new_beacon_int && *beacon_int_gcd != new_beacon_int) {
+		if (*beacon_int_gcd)
+			*beacon_int_different = true;
+		*beacon_int_gcd = gcd(*beacon_int_gcd, new_beacon_int);
+	}
+}
+
+int cfg80211_validate_beacon_int(struct cfg80211_registered_device *rdev,
+				 enum nl80211_iftype iftype, u32 beacon_int)
+{
+	/*
+	 * This is just a basic pre-condition check; if interface combinations
+	 * are possible the driver must already be checking those with a call
+	 * to cfg80211_check_combinations(), in which case we'll validate more
+	 * through the cfg80211_calculate_bi_data() call and code in
+	 * cfg80211_iter_combinations().
+	 */
+
+	if (beacon_int < 10 || beacon_int > 10000)
+		return -EINVAL;
+
+	return 0;
+}
+
+int cfg80211_iter_combinations(struct wiphy *wiphy,
+			       struct iface_combination_params *params,
+			       void (*iter)(const struct ieee80211_iface_combination *c,
+					    void *data),
+			       void *data)
+{
+	const struct ieee80211_regdomain *regdom;
+	enum nl80211_dfs_regions region = 0;
+	int i, j, iftype;
+	int num_interfaces = 0;
+	u32 used_iftypes = 0;
+	u32 beacon_int_gcd;
+	bool beacon_int_different;
+
+	/*
+	 * This is a bit strange, since the iteration used to rely only on
+	 * the data given by the driver, but here it now relies on context,
+	 * in form of the currently operating interfaces.
+	 * This is OK for all current users, and saves us from having to
+	 * push the GCD calculations into all the drivers.
+	 * In the future, this should probably rely more on data that's in
+	 * cfg80211 already - the only thing not would appear to be any new
+	 * interfaces (while being brought up) and channel/radar data.
+	 */
+	cfg80211_calculate_bi_data(wiphy, params->new_beacon_int,
+				   &beacon_int_gcd, &beacon_int_different);
+
+	if (params->radar_detect) {
+		rcu_read_lock();
+		regdom = rcu_dereference(cfg80211_regdomain);
+		if (regdom)
+			region = regdom->dfs_region;
+		rcu_read_unlock();
+	}
+
+	for (iftype = 0; iftype < NUM_NL80211_IFTYPES; iftype++) {
+		num_interfaces += params->iftype_num[iftype];
+		if (params->iftype_num[iftype] > 0 &&
+		    !cfg80211_iftype_allowed(wiphy, iftype, 0, 1))
+			used_iftypes |= BIT(iftype);
+	}
+
+	for (i = 0; i < wiphy->n_iface_combinations; i++) {
+		const struct ieee80211_iface_combination *c;
+		struct ieee80211_iface_limit *limits;
+		u32 all_iftypes = 0;
+
+		c = &wiphy->iface_combinations[i];
+
+		if (num_interfaces > c->max_interfaces)
+			continue;
+		if (params->num_different_channels > c->num_different_channels)
+			continue;
+
+		limits = kmemdup(c->limits, sizeof(limits[0]) * c->n_limits,
+				 GFP_KERNEL);
+		if (!limits)
+			return -ENOMEM;
+
+		for (iftype = 0; iftype < NUM_NL80211_IFTYPES; iftype++) {
+			if (cfg80211_iftype_allowed(wiphy, iftype, 0, 1))
+				continue;
+			for (j = 0; j < c->n_limits; j++) {
+				all_iftypes |= limits[j].types;
+				if (!(limits[j].types & BIT(iftype)))
+					continue;
+				if (limits[j].max < params->iftype_num[iftype])
+					goto cont;
+				limits[j].max -= params->iftype_num[iftype];
+			}
+		}
+
+		if (params->radar_detect !=
+			(c->radar_detect_widths & params->radar_detect))
+			goto cont;
+
+		if (params->radar_detect && c->radar_detect_regions &&
+		    !(c->radar_detect_regions & BIT(region)))
+			goto cont;
+
+		/* Finally check that all iftypes that we're currently
+		 * using are actually part of this combination. If they
+		 * aren't then we can't use this combination and have
+		 * to continue to the next.
+		 */
+		if ((all_iftypes & used_iftypes) != used_iftypes)
+			goto cont;
+
+		if (beacon_int_gcd) {
+			if (c->beacon_int_min_gcd &&
+			    beacon_int_gcd < c->beacon_int_min_gcd)
+				goto cont;
+			if (!c->beacon_int_min_gcd && beacon_int_different)
+				goto cont;
+		}
+
+		/* This combination covered all interface types and
+		 * supported the requested numbers, so we're good.
+		 */
+
+		(*iter)(c, data);
+ cont:
+		kfree(limits);
+	}
+
+	return 0;
+}
+EXPORT_SYMBOL(cfg80211_iter_combinations);
+
+static void
+cfg80211_iter_sum_ifcombs(const struct ieee80211_iface_combination *c,
+			  void *data)
+{
+	int *num = data;
+	(*num)++;
+}
+
+int cfg80211_check_combinations(struct wiphy *wiphy,
+				struct iface_combination_params *params)
+{
+	int err, num = 0;
+
+	err = cfg80211_iter_combinations(wiphy, params,
+					 cfg80211_iter_sum_ifcombs, &num);
+	if (err)
+		return err;
+	if (num == 0)
+		return -EBUSY;
+
+	return 0;
+}
+EXPORT_SYMBOL(cfg80211_check_combinations);
+
+int ieee80211_get_ratemask(struct ieee80211_supported_band *sband,
+			   const u8 *rates, unsigned int n_rates,
+			   u32 *mask)
+{
+	int i, j;
+
+	if (!sband)
+		return -EINVAL;
+
+	if (n_rates == 0 || n_rates > NL80211_MAX_SUPP_RATES)
+		return -EINVAL;
+
+	*mask = 0;
+
+	for (i = 0; i < n_rates; i++) {
+		int rate = (rates[i] & 0x7f) * 5;
+		bool found = false;
+
+		for (j = 0; j < sband->n_bitrates; j++) {
+			if (sband->bitrates[j].bitrate == rate) {
+				found = true;
+				*mask |= BIT(j);
+				break;
+			}
+		}
+		if (!found)
+			return -EINVAL;
+	}
+
+	/*
+	 * mask must have at least one bit set here since we
+	 * didn't accept a 0-length rates array nor allowed
+	 * entries in the array that didn't exist
+	 */
+
+	return 0;
+}
+
+unsigned int ieee80211_get_num_supported_channels(struct wiphy *wiphy)
+{
+	enum nl80211_band band;
+	unsigned int n_channels = 0;
+
+	for (band = 0; band < NUM_NL80211_BANDS; band++)
+		if (wiphy->bands[band])
+			n_channels += wiphy->bands[band]->n_channels;
+
+	return n_channels;
+}
+EXPORT_SYMBOL(ieee80211_get_num_supported_channels);
+
+int cfg80211_get_station(struct net_device *dev, const u8 *mac_addr,
+			 struct station_info *sinfo)
+{
+	struct cfg80211_registered_device *rdev;
+	struct wireless_dev *wdev;
+
+	wdev = dev->ieee80211_ptr;
+	if (!wdev)
+		return -EOPNOTSUPP;
+
+	rdev = wiphy_to_rdev(wdev->wiphy);
+	if (!rdev->ops->get_station)
+		return -EOPNOTSUPP;
+
+	memset(sinfo, 0, sizeof(*sinfo));
+
+	return rdev_get_station(rdev, dev, mac_addr, sinfo);
+}
+EXPORT_SYMBOL(cfg80211_get_station);
+
+void cfg80211_free_nan_func(struct cfg80211_nan_func *f)
+{
+	int i;
+
+	if (!f)
+		return;
+
+	kfree(f->serv_spec_info);
+	kfree(f->srf_bf);
+	kfree(f->srf_macs);
+	for (i = 0; i < f->num_rx_filters; i++)
+		kfree(f->rx_filters[i].filter);
+
+	for (i = 0; i < f->num_tx_filters; i++)
+		kfree(f->tx_filters[i].filter);
+
+	kfree(f->rx_filters);
+	kfree(f->tx_filters);
+	kfree(f);
+}
+EXPORT_SYMBOL(cfg80211_free_nan_func);
+
+bool cfg80211_does_bw_fit_range(const struct ieee80211_freq_range *freq_range,
+				u32 center_freq_khz, u32 bw_khz)
+{
+	u32 start_freq_khz, end_freq_khz;
+
+	start_freq_khz = center_freq_khz - (bw_khz / 2);
+	end_freq_khz = center_freq_khz + (bw_khz / 2);
+
+	if (start_freq_khz >= freq_range->start_freq_khz &&
+	    end_freq_khz <= freq_range->end_freq_khz)
+		return true;
+
+	return false;
+}
+
+int cfg80211_sinfo_alloc_tid_stats(struct station_info *sinfo, gfp_t gfp)
+{
+	sinfo->pertid = kcalloc(IEEE80211_NUM_TIDS + 1,
+				sizeof(*(sinfo->pertid)),
+				gfp);
+	if (!sinfo->pertid)
+		return -ENOMEM;
+
+	return 0;
+}
+EXPORT_SYMBOL(cfg80211_sinfo_alloc_tid_stats);
+
+/* See IEEE 802.1H for LLC/SNAP encapsulation/decapsulation */
+/* Ethernet-II snap header (RFC1042 for most EtherTypes) */
+const unsigned char rfc1042_header[] __aligned(2) =
+	{ 0xaa, 0xaa, 0x03, 0x00, 0x00, 0x00 };
+EXPORT_SYMBOL(rfc1042_header);
+
+/* Bridge-Tunnel header (for EtherTypes ETH_P_AARP and ETH_P_IPX) */
+const unsigned char bridge_tunnel_header[] __aligned(2) =
+	{ 0xaa, 0xaa, 0x03, 0x00, 0x00, 0xf8 };
+EXPORT_SYMBOL(bridge_tunnel_header);
+
+bool cfg80211_iftype_allowed(struct wiphy *wiphy, enum nl80211_iftype iftype,
+			     bool is_4addr, u8 check_swif)
+
+{
+	bool is_vlan = iftype == NL80211_IFTYPE_AP_VLAN;
+
+	switch (check_swif) {
+	case 0:
+		if (is_vlan && is_4addr)
+			return wiphy->flags & WIPHY_FLAG_4ADDR_AP;
+		return wiphy->interface_modes & BIT(iftype);
+	case 1:
+		if (!(wiphy->software_iftypes & BIT(iftype)) && is_vlan)
+			return wiphy->flags & WIPHY_FLAG_4ADDR_AP;
+		return wiphy->software_iftypes & BIT(iftype);
+	default:
+		break;
+	}
+
+	return false;
+}
+EXPORT_SYMBOL(cfg80211_iftype_allowed);
+
+/* Layer 2 Update frame (802.2 Type 1 LLC XID Update response) */
+struct iapp_layer2_update {
+	u8 da[ETH_ALEN];	/* broadcast */
+	u8 sa[ETH_ALEN];	/* STA addr */
+	__be16 len;		/* 6 */
+	u8 dsap;		/* 0 */
+	u8 ssap;		/* 0 */
+	u8 control;
+	u8 xid_info[3];
+} __packed;
+
+void cfg80211_send_layer2_update(struct net_device *dev, const u8 *addr)
+{
+	struct iapp_layer2_update *msg;
+	struct sk_buff *skb;
+
+	/* Send Level 2 Update Frame to update forwarding tables in layer 2
+	 * bridge devices */
+
+	skb = dev_alloc_skb(sizeof(*msg));
+	if (!skb)
+		return;
+	msg = skb_put(skb, sizeof(*msg));
+
+	/* 802.2 Type 1 Logical Link Control (LLC) Exchange Identifier (XID)
+	 * Update response frame; IEEE Std 802.2-1998, 5.4.1.2.1 */
+
+	eth_broadcast_addr(msg->da);
+	ether_addr_copy(msg->sa, addr);
+	msg->len = htons(6);
+	msg->dsap = 0;
+	msg->ssap = 0x01;	/* NULL LSAP, CR Bit: Response */
+	msg->control = 0xaf;	/* XID response lsb.1111F101.
+				 * F=0 (no poll command; unsolicited frame) */
+	msg->xid_info[0] = 0x81;	/* XID format identifier */
+	msg->xid_info[1] = 1;	/* LLC types/classes: Type 1 LLC */
+	msg->xid_info[2] = 0;	/* XID sender's receive window size (RW) */
+
+	skb->dev = dev;
+	skb->protocol = eth_type_trans(skb, dev);
+	memset(skb->cb, 0, sizeof(skb->cb));
+	netif_rx_ni(skb);
+}
+EXPORT_SYMBOL(cfg80211_send_layer2_update);