Release 4.11 net/mac80211/wpa.c

/*
 * Copyright 2002-2004, Instant802 Networks, Inc.
 * Copyright 2008, Jouni Malinen <j@w1.fi>
 * Copyright (C) 2016 Intel Deutschland GmbH
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <linux/netdevice.h>
#include <linux/types.h>
#include <linux/skbuff.h>
#include <linux/compiler.h>
#include <linux/ieee80211.h>
#include <linux/gfp.h>
#include <asm/unaligned.h>
#include <net/mac80211.h>
#include <crypto/aes.h>

#include "ieee80211_i.h"
#include "michael.h"
#include "tkip.h"
#include "aes_ccm.h"
#include "aes_cmac.h"
#include "aes_gmac.h"
#include "aes_gcm.h"
#include "wpa.h"


ieee80211_tx_result

ieee80211_tx_h_michael_mic_add(struct ieee80211_tx_data *tx)
{
	u8 *data, *key, *mic;
	size_t data_len;
	unsigned int hdrlen;
	struct ieee80211_hdr *hdr;
	struct sk_buff *skb = tx->skb;
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
	int tail;

	hdr = (struct ieee80211_hdr *)skb->data;
	if (!tx->key || tx->key->conf.cipher != WLAN_CIPHER_SUITE_TKIP ||
	    skb->len < 24 || !ieee80211_is_data_present(hdr->frame_control))
		return TX_CONTINUE;

	hdrlen = ieee80211_hdrlen(hdr->frame_control);
	if (skb->len < hdrlen)
		return TX_DROP;

	data = skb->data + hdrlen;
	data_len = skb->len - hdrlen;

	if (unlikely(info->flags & IEEE80211_TX_INTFL_TKIP_MIC_FAILURE)) {
		/* Need to use software crypto for the test */
		info->control.hw_key = NULL;
	}

	if (info->control.hw_key &&
	    (info->flags & IEEE80211_TX_CTL_DONTFRAG ||
	     ieee80211_hw_check(&tx->local->hw, SUPPORTS_TX_FRAG)) &&
	    !(tx->key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC)) {
		/* hwaccel - with no need for SW-generated MMIC */
		return TX_CONTINUE;
	}

	tail = MICHAEL_MIC_LEN;
	if (!info->control.hw_key)
		tail += IEEE80211_TKIP_ICV_LEN;

	if (WARN(skb_tailroom(skb) < tail ||
		 skb_headroom(skb) < IEEE80211_TKIP_IV_LEN,
		 "mmic: not enough head/tail (%d/%d,%d/%d)\n",
		 skb_headroom(skb), IEEE80211_TKIP_IV_LEN,
		 skb_tailroom(skb), tail))
		return TX_DROP;

	key = &tx->key->conf.key[NL80211_TKIP_DATA_OFFSET_TX_MIC_KEY];
	mic = skb_put(skb, MICHAEL_MIC_LEN);
	michael_mic(key, hdr, data, data_len, mic);
	if (unlikely(info->flags & IEEE80211_TX_INTFL_TKIP_MIC_FAILURE))
		mic[0]++;

	return TX_CONTINUE;
}


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25.08%
10
58.82%
Harvey Harrison
53
16.83%
2
11.76%
Jouni Malinen
40
12.70%
2
11.76%
Sara Sharon
7
2.22%
1
5.88%
Jiri Slaby
4
1.27%
1
5.88%
Total
315
100.00%
17
100.00%


ieee80211_rx_result

ieee80211_rx_h_michael_mic_verify(struct ieee80211_rx_data *rx)
{
	u8 *data, *key = NULL;
	size_t data_len;
	unsigned int hdrlen;
	u8 mic[MICHAEL_MIC_LEN];
	struct sk_buff *skb = rx->skb;
	struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;

	/*
         * it makes no sense to check for MIC errors on anything other
         * than data frames.
         */
	if (!ieee80211_is_data_present(hdr->frame_control))
		return RX_CONTINUE;

	/*
         * No way to verify the MIC if the hardware stripped it or
         * the IV with the key index. In this case we have solely rely
         * on the driver to set RX_FLAG_MMIC_ERROR in the event of a
         * MIC failure report.
         */
	if (status->flag & (RX_FLAG_MMIC_STRIPPED | RX_FLAG_IV_STRIPPED)) {
		if (status->flag & RX_FLAG_MMIC_ERROR)
			goto mic_fail_no_key;

		if (!(status->flag & RX_FLAG_IV_STRIPPED) && rx->key &&
		    rx->key->conf.cipher == WLAN_CIPHER_SUITE_TKIP)
			goto update_iv;

		return RX_CONTINUE;
	}

	/*
         * Some hardware seems to generate Michael MIC failure reports; even
         * though, the frame was not encrypted with TKIP and therefore has no
         * MIC. Ignore the flag them to avoid triggering countermeasures.
         */
	if (!rx->key || rx->key->conf.cipher != WLAN_CIPHER_SUITE_TKIP ||
	    !(status->flag & RX_FLAG_DECRYPTED))
		return RX_CONTINUE;

	if (rx->sdata->vif.type == NL80211_IFTYPE_AP && rx->key->conf.keyidx) {
		/*
                 * APs with pairwise keys should never receive Michael MIC
                 * errors for non-zero keyidx because these are reserved for
                 * group keys and only the AP is sending real multicast
                 * frames in the BSS.
                 */
		return RX_DROP_UNUSABLE;
	}

	if (status->flag & RX_FLAG_MMIC_ERROR)
		goto mic_fail;

	hdrlen = ieee80211_hdrlen(hdr->frame_control);
	if (skb->len < hdrlen + MICHAEL_MIC_LEN)
		return RX_DROP_UNUSABLE;

	if (skb_linearize(rx->skb))
		return RX_DROP_UNUSABLE;
	hdr = (void *)skb->data;

	data = skb->data + hdrlen;
	data_len = skb->len - hdrlen - MICHAEL_MIC_LEN;
	key = &rx->key->conf.key[NL80211_TKIP_DATA_OFFSET_RX_MIC_KEY];
	michael_mic(key, hdr, data, data_len, mic);
	if (memcmp(mic, data + data_len, MICHAEL_MIC_LEN) != 0)
		goto mic_fail;

	/* remove Michael MIC from payload */
	skb_trim(skb, skb->len - MICHAEL_MIC_LEN);

update_iv:
	/* update IV in key information to be able to detect replays */
	rx->key->u.tkip.rx[rx->security_idx].iv32 = rx->tkip_iv32;
	rx->key->u.tkip.rx[rx->security_idx].iv16 = rx->tkip_iv16;

	return RX_CONTINUE;

mic_fail:
	rx->key->u.tkip.mic_failures++;

mic_fail_no_key:
	/*
         * In some cases the key can be unset - e.g. a multicast packet, in
         * a driver that supports HW encryption. Send up the key idx only if
         * the key is set.
         */
	cfg80211_michael_mic_failure(rx->sdata->dev, hdr->addr2,
				     is_multicast_ether_addr(hdr->addr1) ?
				     NL80211_KEYTYPE_GROUP :
				     NL80211_KEYTYPE_PAIRWISE,
				     rx->key ? rx->key->conf.keyidx : -1,
				     NULL, GFP_ATOMIC);
	return RX_DROP_UNUSABLE;
}

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117
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11
50.00%
Christian Lamparter
116
26.85%
1
4.55%
Harvey Harrison
42
9.72%
3
13.64%
Saravana
14
3.24%
1
4.55%
Stanislaw Gruszka
14
3.24%
2
9.09%
Arik Nemtsov
8
1.85%
1
4.55%
Emmanuel Grumbach
1
0.23%
1
4.55%
Jouni Malinen
1
0.23%
1
4.55%
Total
432
100.00%
22
100.00%



static int tkip_encrypt_skb(struct ieee80211_tx_data *tx, struct sk_buff *skb)
{
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
	struct ieee80211_key *key = tx->key;
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
	unsigned int hdrlen;
	int len, tail;
	u64 pn;
	u8 *pos;

	if (info->control.hw_key &&
	    !(info->control.hw_key->flags & IEEE80211_KEY_FLAG_GENERATE_IV) &&
	    !(info->control.hw_key->flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE)) {
		/* hwaccel - with no need for software-generated IV */
		return 0;
	}

	hdrlen = ieee80211_hdrlen(hdr->frame_control);
	len = skb->len - hdrlen;

	if (info->control.hw_key)
		tail = 0;
	else
		tail = IEEE80211_TKIP_ICV_LEN;

	if (WARN_ON(skb_tailroom(skb) < tail ||
		    skb_headroom(skb) < IEEE80211_TKIP_IV_LEN))
		return -1;

	pos = skb_push(skb, IEEE80211_TKIP_IV_LEN);
	memmove(pos, pos + IEEE80211_TKIP_IV_LEN, hdrlen);
	pos += hdrlen;

	/* the HW only needs room for the IV, but not the actual IV */
	if (info->control.hw_key &&
	    (info->control.hw_key->flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE))
		return 0;

	/* Increase IV for the frame */
	pn = atomic64_inc_return(&key->conf.tx_pn);
	pos = ieee80211_tkip_add_iv(pos, &key->conf, pn);

	/* hwaccel - with software IV */
	if (info->control.hw_key)
		return 0;

	/* Add room for ICV */
	skb_put(skb, IEEE80211_TKIP_ICV_LEN);

	return ieee80211_tkip_encrypt_data(tx->local->wep_tx_tfm,
					   key, skb, pos, len);
}


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Johannes Berg
81
29.45%
8
57.14%
Janusz Dziedzic
37
13.45%
1
7.14%
Eliad Peller
11
4.00%
1
7.14%
Harvey Harrison
5
1.82%
1
7.14%
Ivo van Doorn
1
0.36%
1
7.14%
John W. Linville
1
0.36%
1
7.14%
Total
275
100.00%
14
100.00%


ieee80211_tx_result

ieee80211_crypto_tkip_encrypt(struct ieee80211_tx_data *tx)
{
	struct sk_buff *skb;

	ieee80211_tx_set_protected(tx);

	skb_queue_walk(&tx->skbs, skb) {
		if (tkip_encrypt_skb(tx, skb) < 0)
			return TX_DROP;
	}

	return TX_CONTINUE;
}


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5
83.33%
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45
100.00%
6
100.00%


ieee80211_rx_result

ieee80211_crypto_tkip_decrypt(struct ieee80211_rx_data *rx)
{
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data;
	int hdrlen, res, hwaccel = 0;
	struct ieee80211_key *key = rx->key;
	struct sk_buff *skb = rx->skb;
	struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);

	hdrlen = ieee80211_hdrlen(hdr->frame_control);

	if (!ieee80211_is_data(hdr->frame_control))
		return RX_CONTINUE;

	if (!rx->sta || skb->len - hdrlen < 12)
		return RX_DROP_UNUSABLE;

	/* it may be possible to optimize this a bit more */
	if (skb_linearize(rx->skb))
		return RX_DROP_UNUSABLE;
	hdr = (void *)skb->data;

	/*
         * Let TKIP code verify IV, but skip decryption.
         * In the case where hardware checks the IV as well,
         * we don't even get here, see ieee80211_rx_h_decrypt()
         */
	if (status->flag & RX_FLAG_DECRYPTED)
		hwaccel = 1;

	res = ieee80211_tkip_decrypt_data(rx->local->wep_rx_tfm,
					  key, skb->data + hdrlen,
					  skb->len - hdrlen, rx->sta->sta.addr,
					  hdr->addr1, hwaccel, rx->security_idx,
					  &rx->tkip_iv32,
					  &rx->tkip_iv16);
	if (res != TKIP_DECRYPT_OK)
		return RX_DROP_UNUSABLE;

	/* Trim ICV */
	if (!(status->flag & RX_FLAG_ICV_STRIPPED))
		skb_trim(skb, skb->len - IEEE80211_TKIP_ICV_LEN);

	/* Remove IV */
	memmove(skb->data + IEEE80211_TKIP_IV_LEN, skb->data, hdrlen);
	skb_pull(skb, IEEE80211_TKIP_IV_LEN);

	return RX_CONTINUE;
}


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David Spinadel
11
4.40%
1
6.25%
Harvey Harrison
8
3.20%
2
12.50%
Emmanuel Grumbach
4
1.60%
1
6.25%
Total
250
100.00%
16
100.00%



static void ccmp_special_blocks(struct sk_buff *skb, u8 *pn, u8 *b_0, u8 *aad)
{
	__le16 mask_fc;
	int a4_included, mgmt;
	u8 qos_tid;
	u16 len_a;
	unsigned int hdrlen;
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;

	/*
         * Mask FC: zero subtype b4 b5 b6 (if not mgmt)
         * Retry, PwrMgt, MoreData; set Protected
         */
	mgmt = ieee80211_is_mgmt(hdr->frame_control);
	mask_fc = hdr->frame_control;
	mask_fc &= ~cpu_to_le16(IEEE80211_FCTL_RETRY |
				IEEE80211_FCTL_PM | IEEE80211_FCTL_MOREDATA);
	if (!mgmt)
		mask_fc &= ~cpu_to_le16(0x0070);
	mask_fc |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);

	hdrlen = ieee80211_hdrlen(hdr->frame_control);
	len_a = hdrlen - 2;
	a4_included = ieee80211_has_a4(hdr->frame_control);

	if (ieee80211_is_data_qos(hdr->frame_control))
		qos_tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
	else
		qos_tid = 0;

	/* In CCM, the initial vectors (IV) used for CTR mode encryption and CBC
         * mode authentication are not allowed to collide, yet both are derived
         * from this vector b_0. We only set L := 1 here to indicate that the
         * data size can be represented in (L+1) bytes. The CCM layer will take
         * care of storing the data length in the top (L+1) bytes and setting
         * and clearing the other bits as is required to derive the two IVs.
         */
	b_0[0] = 0x1;

	/* Nonce: Nonce Flags | A2 | PN
         * Nonce Flags: Priority (b0..b3) | Management (b4) | Reserved (b5..b7)
         */
	b_0[1] = qos_tid | (mgmt << 4);
	memcpy(&b_0[2], hdr->addr2, ETH_ALEN);
	memcpy(&b_0[8], pn, IEEE80211_CCMP_PN_LEN);

	/* AAD (extra authenticate-only data) / masked 802.11 header
         * FC | A1 | A2 | A3 | SC | [A4] | [QC] */
	put_unaligned_be16(len_a, &aad[0]);
	put_unaligned(mask_fc, (__le16 *)&aad[2]);
	memcpy(&aad[4], &hdr->addr1, 3 * ETH_ALEN);

	/* Mask Seq#, leave Frag# */
	aad[22] = *((u8 *) &hdr->seq_ctrl) & 0x0f;
	aad[23] = 0;

	if (a4_included) {
		memcpy(&aad[24], hdr->addr4, ETH_ALEN);
		aad[30] = qos_tid;
		aad[31] = 0;
	} else {
		memset(&aad[24], 0, ETH_ALEN + IEEE80211_QOS_CTL_LEN);
		aad[24] = qos_tid;
	}
}


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81
24.32%
2
33.33%
Jouni Malinen
32
9.61%
1
16.67%
Ard Biesheuvel
7
2.10%
1
16.67%
Johannes Berg
1
0.30%
1
16.67%
Total
333
100.00%
6
100.00%



static inline void ccmp_pn2hdr(u8 *hdr, u8 *pn, int key_id)
{
	hdr[0] = pn[5];
	hdr[1] = pn[4];
	hdr[2] = 0;
	hdr[3] = 0x20 | (key_id << 6);
	hdr[4] = pn[3];
	hdr[5] = pn[2];
	hdr[6] = pn[1];
	hdr[7] = pn[0];
}


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static inline void ccmp_hdr2pn(u8 *pn, u8 *hdr)
{
	pn[0] = hdr[7];
	pn[1] = hdr[6];
	pn[2] = hdr[5];
	pn[3] = hdr[4];
	pn[4] = hdr[1];
	pn[5] = hdr[0];
}


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75
100.00%
2
100.00%



static int ccmp_encrypt_skb(struct ieee80211_tx_data *tx, struct sk_buff *skb,
			    unsigned int mic_len)
{
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
	struct ieee80211_key *key = tx->key;
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
	int hdrlen, len, tail;
	u8 *pos;
	u8 pn[6];
	u64 pn64;
	u8 aad[CCM_AAD_LEN];
	u8 b_0[AES_BLOCK_SIZE];

	if (info->control.hw_key &&
	    !(info->control.hw_key->flags & IEEE80211_KEY_FLAG_GENERATE_IV) &&
	    !(info->control.hw_key->flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE) &&
	    !((info->control.hw_key->flags &
	       IEEE80211_KEY_FLAG_GENERATE_IV_MGMT) &&
	      ieee80211_is_mgmt(hdr->frame_control))) {
		/*
                 * hwaccel has no need for preallocated room for CCMP
                 * header or MIC fields
                 */
		return 0;
	}

	hdrlen = ieee80211_hdrlen(hdr->frame_control);
	len = skb->len - hdrlen;

	if (info->control.hw_key)
		tail = 0;
	else
		tail = mic_len;

	if (WARN_ON(skb_tailroom(skb) < tail ||
		    skb_headroom(skb) < IEEE80211_CCMP_HDR_LEN))
		return -1;

	pos = skb_push(skb, IEEE80211_CCMP_HDR_LEN);
	memmove(pos, pos + IEEE80211_CCMP_HDR_LEN, hdrlen);

	/* the HW only needs room for the IV, but not the actual IV */
	if (info->control.hw_key &&
	    (info->control.hw_key->flags & IEEE80211_KEY_FLAG_PUT_IV_SPACE))
		return 0;

	hdr = (struct ieee80211_hdr *) pos;
	pos += hdrlen;

	pn64 = atomic64_inc_return(&key->conf.tx_pn);

	pn[5] = pn64;
	pn[4] = pn64 >> 8;
	pn[3] = pn64 >> 16;
	pn[2] = pn64 >> 24;
	pn[1] = pn64 >> 32;
	pn[0] = pn64 >> 40;

	ccmp_pn2hdr(pos, pn, key->conf.keyidx);

	/* hwaccel - with software CCMP header */
	if (info->control.hw_key)
		return 0;

	pos += IEEE80211_CCMP_HDR_LEN;
	ccmp_special_blocks(skb, pn, b_0, aad);
	return ieee80211_aes_ccm_encrypt(key->u.ccmp.tfm, b_0, aad, pos, len,
					 skb_put(skb, mic_len), mic_len);
}


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129
32.74%
9
50.00%
Arik Nemtsov
37
9.39%
2
11.11%
Marek Kwaczynski
22
5.58%
1
5.56%
Ard Biesheuvel
15
3.81%
2
11.11%
Jouni Malinen
8
2.03%
1
5.56%
Harvey Harrison
2
0.51%
1
5.56%
Ivo van Doorn
1
0.25%
1
5.56%
Total
394
100.00%
18
100.00%


ieee80211_tx_result

ieee80211_crypto_ccmp_encrypt(struct ieee80211_tx_data *tx,
			      unsigned int mic_len)
{
	struct sk_buff *skb;

	ieee80211_tx_set_protected(tx);

	skb_queue_walk(&tx->skbs, skb) {
		if (ccmp_encrypt_skb(tx, skb, mic_len) < 0)
			return TX_DROP;
	}

	return TX_CONTINUE;
}


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Jiri Benc
31
60.78%
1
14.29%
Johannes Berg
14
27.45%
5
71.43%
Jouni Malinen
6
11.76%
1
14.29%
Total
51
100.00%
7
100.00%


ieee80211_rx_result

ieee80211_crypto_ccmp_decrypt(struct ieee80211_rx_data *rx,
			      unsigned int mic_len)
{
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
	int hdrlen;
	struct ieee80211_key *key = rx->key;
	struct sk_buff *skb = rx->skb;
	struct ieee80211_rx_status *status = IEEE80211_SKB_RXCB(skb);
	u8 pn[IEEE80211_CCMP_PN_LEN];
	int data_len;
	int queue;

	hdrlen = ieee80211_hdrlen(hdr->frame_control);

	if (!ieee80211_is_data(hdr->frame_control) &&
	    !ieee80211_is_robust_mgmt_frame(skb))
		return RX_CONTINUE;

	if (status->flag & RX_FLAG_DECRYPTED) {
		if (!pskb_may_pull(rx->skb, hdrlen + IEEE80211_CCMP_HDR_LEN))
			return RX_DROP_UNUSABLE;
		if (status->flag & RX_FLAG_MIC_STRIPPED)
			mic_len = 0;
	} else {
		if (skb_linearize(rx->skb))
			return RX_DROP_UNUSABLE;
	}

	data_len = skb->len - hdrlen - IEEE80211_CCMP_HDR_LEN - mic_len;
	if (!rx->sta || data_len < 0)
		return RX_DROP_UNUSABLE;

	if (!(status->flag & RX_FLAG_PN_VALIDATED)) {
		int res;

		ccmp_hdr2pn(pn, skb->data + hdrlen);

		queue = rx->security_idx;

		res = memcmp(pn, key->u.ccmp.rx_pn[queue],
			     IEEE80211_CCMP_PN_LEN);
		if (res < 0 ||
		    (!res && !(status->flag & RX_FLAG_ALLOW_SAME_PN))) {
			key->u.ccmp.replays++;
			return RX_DROP_UNUSABLE;
		}

		if (!(status->flag & RX_FLAG_DECRYPTED)) {
			u8 aad[2 * AES_BLOCK_SIZE];
			u8 b_0[AES_BLOCK_SIZE];
			/* hardware didn't decrypt/verify MIC */
			ccmp_special_blocks(skb, pn, b_0, aad);

			if (ieee80211_aes_ccm_decrypt(
				    key->u.ccmp.tfm, b_0, aad,
				    skb->data + hdrlen + IEEE80211_CCMP_HDR_LEN,
				    data_len,
				    skb->data + skb->len - mic_len, mic_len))
				return RX_DROP_UNUSABLE;
		}

		memcpy(key->u.ccmp.rx_pn[queue], pn, IEEE80211_CCMP_PN_LEN);
	}

	/* Remove CCMP header and MIC */
	if (pskb_trim(skb, skb->len - mic_len))
		return RX_DROP_UNUSABLE;
	memmove(skb->data + IEEE80211_CCMP_HDR_LEN, skb->data, hdrlen);
	skb_pull(skb, IEEE80211_CCMP_HDR_LEN);

	return RX_CONTINUE;
}

Contributors
Person
Tokens
Prop
Commits
CommitProp
Jiri Benc
203
49.63%
1
4.35%
Johannes Berg
95
23.23%
13
56.52%
Sara Sharon
62
15.16%
2
8.70%
Jouni Malinen
21
5.13%
3
13.04%
Harvey Harrison
14
3.42%
3
13.04%
Ard Biesheuvel
14
3.42%
1
4.35%
Total
409
100.00%
23
100.00%



static void gcmp_special_blocks(struct sk_buff *skb, u8 *pn, u8 *j_0, u8 *aad)
{
	__le16 mask_fc;
	u8 qos_tid;
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;

	memcpy(j_0, hdr->addr2, ETH_ALEN);
	memcpy(&j_0[ETH_ALEN], pn, IEEE80211_GCMP_PN_LEN);
	j_0[13] = 0;
	j_0[14] = 0;
	j_0[AES_BLOCK_SIZE - 1] = 0x01;

	/* AAD (extra authenticate-only data) / masked 802.11 header
         * FC | A1 | A2 | A3 | SC | [A4] | [QC]
         */
	put_unaligned_be16(ieee80211_hdrlen(hdr->frame_control) - 2, &aad[0]);
	/* Mask FC: zero subtype b4 b5 b6 (if not mgmt)
         * Retry, PwrMgt, MoreData; set Protected
         */
	mask_fc = hdr->frame_control;
	mask_fc &= ~cpu_to_le16(IEEE80211_FCTL_RETRY |
				IEEE80211_FCTL_PM | IEEE80211_FCTL_MOREDATA);
	if (!ieee80211_is_mgmt(hdr->frame_control))
		mask_fc &= ~cpu_to_le16(0x0070);
	mask_fc |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);

	put_unaligned(mask_fc, (__le16 *)&aad[2]);
	memcpy(&aad[4], &hdr->addr1, 3 * ETH_ALEN);

	/* Mask Seq#, leave Frag# */
	aad[22] = *((u8 *)&hdr->seq_ctrl) & 0x0f;
	aad[23] = 0;

	if (ieee80211_is_data_qos(hdr->frame_control))
		qos_tid = *ieee80211_get_qos_ctl(hdr) &
			IEEE80211_QOS_CTL_TID_MASK;
	else
		qos_tid = 0;

	if (ieee80211_has_a4(hdr->frame_control)) {
		memcpy(&aad[24], hdr->addr4, ETH_ALEN);
		aad[30] = qos_tid;
		aad[31] = 0;
	} else {
		memset(&aad[24], 0, ETH_ALEN + IEEE80211_QOS_CTL_LEN);
		aad[24] = qos_tid;
	}
}

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CommitProp
Jouni Malinen
302
100.00%
1
100.00%
Total
302
100.00%
1
100.00%



static inline void gcmp_pn2hdr(u8 *hdr, const u8 *pn, int key_id)
{
	hdr[0] = pn[5];
	hdr[1] = pn[4];
	hdr[2] = 0;
	hdr[3] = 0x20 | (key_id << 6);
	hdr[