[GitHub/mt8127/android_kernel_alcatel_ttab.git] / net / mac80211 / wpa.c

/*
 * Copyright 2002-2004, Instant802 Networks, Inc.
 *
 * 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/slab.h>
#include <linux/skbuff.h>
#include <linux/compiler.h>
#include <linux/ieee80211.h>
#include <asm/unaligned.h>
#include <net/mac80211.h>

#include "ieee80211_i.h"
#include "michael.h"
#include "tkip.h"
#include "aes_ccm.h"
#include "wpa.h"

ieee80211_tx_result
ieee80211_tx_h_michael_mic_add(struct ieee80211_tx_data *tx)
{
	u8 *data, *key, *mic, key_offset;
	size_t data_len;
	unsigned int hdrlen;
	struct ieee80211_hdr *hdr;
	u16 fc;
	struct sk_buff *skb = tx->skb;
	int authenticator;
	int wpa_test = 0;
	int tail;

	fc = tx->fc;

	if (!tx->key || tx->key->conf.alg != ALG_TKIP || skb->len < 24 ||
	    !WLAN_FC_DATA_PRESENT(fc))
		return TX_CONTINUE;

	hdr = (struct ieee80211_hdr *)skb->data;
	hdrlen = ieee80211_hdrlen(hdr->frame_control);
	if (skb->len < hdrlen)
		return TX_DROP;

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

	if ((tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) &&
	    !(tx->flags & IEEE80211_TX_FRAGMENTED) &&
	    !(tx->key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC) &&
	    !wpa_test) {
		/* hwaccel - with no need for preallocated room for Michael MIC
		 */
		return TX_CONTINUE;
	}

	tail = MICHAEL_MIC_LEN;
	if (!(tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
		tail += TKIP_ICV_LEN;

	if (WARN_ON(skb_tailroom(skb) < tail ||
		    skb_headroom(skb) < TKIP_IV_LEN))
		return TX_DROP;

#if 0
	authenticator = fc & IEEE80211_FCTL_FROMDS; /* FIX */
#else
	authenticator = 1;
#endif
	/* At this point we know we're using ALG_TKIP. To get the MIC key
	 * we now will rely on the offset from the ieee80211_key_conf::key */
	key_offset = authenticator ?
		NL80211_TKIP_DATA_OFFSET_TX_MIC_KEY :
		NL80211_TKIP_DATA_OFFSET_RX_MIC_KEY;
	key = &tx->key->conf.key[key_offset];
	mic = skb_put(skb, MICHAEL_MIC_LEN);
	michael_mic(key, hdr, data, data_len, mic);

	return TX_CONTINUE;
}


ieee80211_rx_result
ieee80211_rx_h_michael_mic_verify(struct ieee80211_rx_data *rx)
{
	u8 *data, *key = NULL, key_offset;
	size_t data_len;
	unsigned int hdrlen;
	struct ieee80211_hdr *hdr;
	u16 fc;
	u8 mic[MICHAEL_MIC_LEN];
	struct sk_buff *skb = rx->skb;
	int authenticator = 1, wpa_test = 0;
	DECLARE_MAC_BUF(mac);

	fc = rx->fc;

	/*
	 * No way to verify the MIC if the hardware stripped it
	 */
	if (rx->status->flag & RX_FLAG_MMIC_STRIPPED)
		return RX_CONTINUE;

	if (!rx->key || rx->key->conf.alg != ALG_TKIP ||
	    !(rx->fc & IEEE80211_FCTL_PROTECTED) || !WLAN_FC_DATA_PRESENT(fc))
		return RX_CONTINUE;

	hdr = (struct ieee80211_hdr *)skb->data;
	hdrlen = ieee80211_hdrlen(hdr->frame_control);
	if (skb->len < hdrlen + MICHAEL_MIC_LEN)
		return RX_DROP_UNUSABLE;

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

#if 0
	authenticator = fc & IEEE80211_FCTL_TODS; /* FIX */
#else
	authenticator = 1;
#endif
	/* At this point we know we're using ALG_TKIP. To get the MIC key
	 * we now will rely on the offset from the ieee80211_key_conf::key */
	key_offset = authenticator ?
		NL80211_TKIP_DATA_OFFSET_RX_MIC_KEY :
		NL80211_TKIP_DATA_OFFSET_TX_MIC_KEY;
	key = &rx->key->conf.key[key_offset];
	michael_mic(key, hdr, data, data_len, mic);
	if (memcmp(mic, data + data_len, MICHAEL_MIC_LEN) != 0 || wpa_test) {
		if (!(rx->flags & IEEE80211_RX_RA_MATCH))
			return RX_DROP_UNUSABLE;

		mac80211_ev_michael_mic_failure(rx->dev, rx->key->conf.keyidx,
						(void *) skb->data);
		return RX_DROP_UNUSABLE;
	}

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

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

	return RX_CONTINUE;
}


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;
	u8 *pos;

	info->control.icv_len = TKIP_ICV_LEN;
	info->control.iv_len = TKIP_IV_LEN;

	if ((tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) &&
	    !(tx->key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV)) {
		/* hwaccel - with no need for preallocated room for IV/ICV */
		info->control.hw_key = &tx->key->conf;
		return 0;
	}

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

	if (tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)
		tail = 0;
	else
		tail = TKIP_ICV_LEN;

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

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

	/* Increase IV for the frame */
	key->u.tkip.tx.iv16++;
	if (key->u.tkip.tx.iv16 == 0)
		key->u.tkip.tx.iv32++;

	if (tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) {
		/* hwaccel - with preallocated room for IV */
		ieee80211_tkip_add_iv(pos, key, key->u.tkip.tx.iv16);

		info->control.hw_key = &tx->key->conf;
		return 0;
	}

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

	hdr = (struct ieee80211_hdr *) skb->data;
	ieee80211_tkip_encrypt_data(tx->local->wep_tx_tfm,
				    key, pos, len, hdr->addr2);
	return 0;
}


ieee80211_tx_result
ieee80211_crypto_tkip_encrypt(struct ieee80211_tx_data *tx)
{
	struct sk_buff *skb = tx->skb;

	ieee80211_tx_set_protected(tx);

	if (tkip_encrypt_skb(tx, skb) < 0)
		return TX_DROP;

	if (tx->extra_frag) {
		int i;
		for (i = 0; i < tx->num_extra_frag; i++) {
			if (tkip_encrypt_skb(tx, tx->extra_frag[i]) < 0)
				return TX_DROP;
		}
	}

	return TX_CONTINUE;
}


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, wpa_test = 0;
	struct ieee80211_key *key = rx->key;
	struct sk_buff *skb = rx->skb;
	DECLARE_MAC_BUF(mac);

	hdrlen = ieee80211_hdrlen(hdr->frame_control);

	if ((rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA)
		return RX_CONTINUE;

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

	if (rx->status->flag & RX_FLAG_DECRYPTED) {
		if (rx->status->flag & RX_FLAG_IV_STRIPPED) {
			/*
			 * Hardware took care of all processing, including
			 * replay protection, and stripped the ICV/IV so
			 * we cannot do any checks here.
			 */
			return RX_CONTINUE;
		}

		/* let TKIP code verify IV, but skip decryption */
		hwaccel = 1;
	}

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

	/* Trim ICV */
	skb_trim(skb, skb->len - TKIP_ICV_LEN);

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

	return RX_CONTINUE;
}


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

	/*
	 * Mask FC: zero subtype b4 b5 b6
	 * Retry, PwrMgt, MoreData; set Protected
	 */
	mask_fc = hdr->frame_control;
	mask_fc &= ~cpu_to_le16(0x0070 | IEEE80211_FCTL_RETRY |
				IEEE80211_FCTL_PM | IEEE80211_FCTL_MOREDATA);
	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;

	data_len = skb->len - hdrlen - CCMP_HDR_LEN;
	if (encrypted)
		data_len -= CCMP_MIC_LEN;

	/* First block, b_0 */
	b_0[0] = 0x59; /* flags: Adata: 1, M: 011, L: 001 */
	/* Nonce: QoS Priority | A2 | PN */
	b_0[1] = qos_tid;
	memcpy(&b_0[2], hdr->addr2, ETH_ALEN);
	memcpy(&b_0[8], pn, CCMP_PN_LEN);
	/* l(m) */
	put_unaligned_be16(data_len, &b_0[14]);

	/* 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;
	}
}


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];
}


static inline int 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];
	return (hdr[3] >> 6) & 0x03;
}


static int ccmp_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);
	int hdrlen, len, tail;
	u8 *pos, *pn, *b_0, *aad, *scratch;
	int i;

	info->control.icv_len = CCMP_MIC_LEN;
	info->control.iv_len = CCMP_HDR_LEN;

	if ((tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) &&
	    !(tx->key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV)) {
		/* hwaccel - with no need for preallocated room for CCMP "
		 * header or MIC fields */
		info->control.hw_key = &tx->key->conf;
		return 0;
	}

	scratch = key->u.ccmp.tx_crypto_buf;
	b_0 = scratch + 3 * AES_BLOCK_LEN;
	aad = scratch + 4 * AES_BLOCK_LEN;

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

	if (key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)
		tail = 0;
	else
		tail = CCMP_MIC_LEN;

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

	pos = skb_push(skb, CCMP_HDR_LEN);
	memmove(pos, pos + CCMP_HDR_LEN, hdrlen);
	hdr = (struct ieee80211_hdr *) pos;
	pos += hdrlen;

	/* PN = PN + 1 */
	pn = key->u.ccmp.tx_pn;

	for (i = CCMP_PN_LEN - 1; i >= 0; i--) {
		pn[i]++;
		if (pn[i])
			break;
	}

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

	if (key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) {
		/* hwaccel - with preallocated room for CCMP header */
		info->control.hw_key = &tx->key->conf;
		return 0;
	}

	pos += CCMP_HDR_LEN;
	ccmp_special_blocks(skb, pn, b_0, aad, 0);
	ieee80211_aes_ccm_encrypt(key->u.ccmp.tfm, scratch, b_0, aad, pos, len,
				  pos, skb_put(skb, CCMP_MIC_LEN));

	return 0;
}


ieee80211_tx_result
ieee80211_crypto_ccmp_encrypt(struct ieee80211_tx_data *tx)
{
	struct sk_buff *skb = tx->skb;

	ieee80211_tx_set_protected(tx);

	if (ccmp_encrypt_skb(tx, skb) < 0)
		return TX_DROP;

	if (tx->extra_frag) {
		int i;
		for (i = 0; i < tx->num_extra_frag; i++) {
			if (ccmp_encrypt_skb(tx, tx->extra_frag[i]) < 0)
				return TX_DROP;
		}
	}

	return TX_CONTINUE;
}


ieee80211_rx_result
ieee80211_crypto_ccmp_decrypt(struct ieee80211_rx_data *rx)
{
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data;
	int hdrlen;
	struct ieee80211_key *key = rx->key;
	struct sk_buff *skb = rx->skb;
	u8 pn[CCMP_PN_LEN];
	int data_len;
	DECLARE_MAC_BUF(mac);

	hdrlen = ieee80211_hdrlen(hdr->frame_control);

	if ((rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA)
		return RX_CONTINUE;

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

	if ((rx->status->flag & RX_FLAG_DECRYPTED) &&
	    (rx->status->flag & RX_FLAG_IV_STRIPPED))
		return RX_CONTINUE;

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

	if (memcmp(pn, key->u.ccmp.rx_pn[rx->queue], CCMP_PN_LEN) <= 0) {
		key->u.ccmp.replays++;
		return RX_DROP_UNUSABLE;
	}

	if (!(rx->status->flag & RX_FLAG_DECRYPTED)) {
		/* hardware didn't decrypt/verify MIC */
		u8 *scratch, *b_0, *aad;

		scratch = key->u.ccmp.rx_crypto_buf;
		b_0 = scratch + 3 * AES_BLOCK_LEN;
		aad = scratch + 4 * AES_BLOCK_LEN;

		ccmp_special_blocks(skb, pn, b_0, aad, 1);

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

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

	/* Remove CCMP header and MIC */
	skb_trim(skb, skb->len - CCMP_MIC_LEN);
	memmove(skb->data + CCMP_HDR_LEN, skb->data, hdrlen);
	skb_pull(skb, CCMP_HDR_LEN);

	return RX_CONTINUE;
}
Commit	Line	Data
f0706e82 JB	1	/*
	2	* Copyright 2002-2004, Instant802 Networks, Inc.
	3	*
	4	* This program is free software; you can redistribute it and/or modify
	5	* it under the terms of the GNU General Public License version 2 as
	6	* published by the Free Software Foundation.
	7	*/
	8
	9	#include <linux/netdevice.h>
	10	#include <linux/types.h>
	11	#include <linux/slab.h>
	12	#include <linux/skbuff.h>
	13	#include <linux/compiler.h>
f14df804 HH	14	#include <linux/ieee80211.h>
f14df804 HH	15	#include <asm/unaligned.h>
f0706e82	16	#include <net/mac80211.h>
eb063c17	17
f0706e82 JB	18	#include "ieee80211_i.h"
	19	#include "michael.h"
	20	#include "tkip.h"
	21	#include "aes_ccm.h"
	22	#include "wpa.h"
	23
9ae54c84	24	ieee80211_tx_result
5cf121c3	25	ieee80211_tx_h_michael_mic_add(struct ieee80211_tx_data *tx)
f0706e82	26	{
8e8862b7	27	u8 data, key, *mic, key_offset;
f0706e82	28	size_t data_len;
8e8862b7 HH	29	unsigned int hdrlen;
8e8862b7 HH	30	struct ieee80211_hdr *hdr;
f0706e82 JB	31	u16 fc;
	32	struct sk_buff *skb = tx->skb;
	33	int authenticator;
	34	int wpa_test = 0;
23c0752a	35	int tail;
f0706e82 JB	36
	37	fc = tx->fc;
	38
8f20fc24	39	if (!tx->key \|\| tx->key->conf.alg != ALG_TKIP \|\| skb->len < 24 \|\|
f0706e82	40	!WLAN_FC_DATA_PRESENT(fc))
9ae54c84	41	return TX_CONTINUE;
f0706e82	42
8e8862b7 HH	43	hdr = (struct ieee80211_hdr *)skb->data;
	44	hdrlen = ieee80211_hdrlen(hdr->frame_control);
	45	if (skb->len < hdrlen)
9ae54c84	46	return TX_DROP;
f0706e82	47
8e8862b7 HH	48	data = skb->data + hdrlen;
	49	data_len = skb->len - hdrlen;
	50
11a843b7	51	if ((tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) &&
5cf121c3	52	!(tx->flags & IEEE80211_TX_FRAGMENTED) &&
7848ba7d	53	!(tx->key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC) &&
f0706e82 JB	54	!wpa_test) {
	55	/* hwaccel - with no need for preallocated room for Michael MIC
	56	*/
9ae54c84	57	return TX_CONTINUE;
f0706e82 JB	58	}
f0706e82 JB	59
23c0752a JB	60	tail = MICHAEL_MIC_LEN;
	61	if (!(tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
	62	tail += TKIP_ICV_LEN;
	63
	64	if (WARN_ON(skb_tailroom(skb) < tail \|\|
	65	skb_headroom(skb) < TKIP_IV_LEN))
	66	return TX_DROP;
f0706e82 JB	67
	68	#if 0
	69	authenticator = fc & IEEE80211_FCTL_FROMDS; /* FIX */
	70	#else
	71	authenticator = 1;
	72	#endif
ffd7891d LR	73	/* At this point we know we're using ALG_TKIP. To get the MIC key
	74	* we now will rely on the offset from the ieee80211_key_conf::key */
	75	key_offset = authenticator ?
	76	NL80211_TKIP_DATA_OFFSET_TX_MIC_KEY :
	77	NL80211_TKIP_DATA_OFFSET_RX_MIC_KEY;
	78	key = &tx->key->conf.key[key_offset];
f0706e82	79	mic = skb_put(skb, MICHAEL_MIC_LEN);
8e8862b7	80	michael_mic(key, hdr, data, data_len, mic);
f0706e82	81
9ae54c84	82	return TX_CONTINUE;
f0706e82 JB	83	}
	84
	85
9ae54c84	86	ieee80211_rx_result
5cf121c3	87	ieee80211_rx_h_michael_mic_verify(struct ieee80211_rx_data *rx)
f0706e82	88	{
8e8862b7	89	u8 data, key = NULL, key_offset;
f0706e82	90	size_t data_len;
8e8862b7 HH	91	unsigned int hdrlen;
8e8862b7 HH	92	struct ieee80211_hdr *hdr;
f0706e82 JB	93	u16 fc;
	94	u8 mic[MICHAEL_MIC_LEN];
	95	struct sk_buff *skb = rx->skb;
	96	int authenticator = 1, wpa_test = 0;
0795af57	97	DECLARE_MAC_BUF(mac);
f0706e82 JB	98
	99	fc = rx->fc;
	100
3017b80b JB	101	/*
	102	* No way to verify the MIC if the hardware stripped it
	103	*/
5cf121c3	104	if (rx->status->flag & RX_FLAG_MMIC_STRIPPED)
9ae54c84	105	return RX_CONTINUE;
f0706e82	106
8f20fc24	107	if (!rx->key \|\| rx->key->conf.alg != ALG_TKIP \|\|
f0706e82	108	!(rx->fc & IEEE80211_FCTL_PROTECTED) \|\| !WLAN_FC_DATA_PRESENT(fc))
9ae54c84	109	return RX_CONTINUE;
f0706e82	110
8e8862b7 HH	111	hdr = (struct ieee80211_hdr *)skb->data;
	112	hdrlen = ieee80211_hdrlen(hdr->frame_control);
	113	if (skb->len < hdrlen + MICHAEL_MIC_LEN)
e4c26add	114	return RX_DROP_UNUSABLE;
f0706e82	115
8e8862b7 HH	116	data = skb->data + hdrlen;
8e8862b7 HH	117	data_len = skb->len - hdrlen - MICHAEL_MIC_LEN;
f0706e82 JB	118
	119	#if 0
	120	authenticator = fc & IEEE80211_FCTL_TODS; /* FIX */
	121	#else
	122	authenticator = 1;
	123	#endif
ffd7891d LR	124	/* At this point we know we're using ALG_TKIP. To get the MIC key
	125	* we now will rely on the offset from the ieee80211_key_conf::key */
	126	key_offset = authenticator ?
	127	NL80211_TKIP_DATA_OFFSET_RX_MIC_KEY :
	128	NL80211_TKIP_DATA_OFFSET_TX_MIC_KEY;
	129	key = &rx->key->conf.key[key_offset];
8e8862b7	130	michael_mic(key, hdr, data, data_len, mic);
f0706e82	131	if (memcmp(mic, data + data_len, MICHAEL_MIC_LEN) != 0 \|\| wpa_test) {
5cf121c3	132	if (!(rx->flags & IEEE80211_RX_RA_MATCH))
e4c26add	133	return RX_DROP_UNUSABLE;
f0706e82	134
8f20fc24	135	mac80211_ev_michael_mic_failure(rx->dev, rx->key->conf.keyidx,
eb063c17	136	(void *) skb->data);
e4c26add	137	return RX_DROP_UNUSABLE;
f0706e82 JB	138	}
f0706e82 JB	139
f0706e82 JB	140	/* remove Michael MIC from payload */
	141	skb_trim(skb, skb->len - MICHAEL_MIC_LEN);
	142
50741ae0	143	/* update IV in key information to be able to detect replays */
b0f76b33 HH	144	rx->key->u.tkip.rx[rx->queue].iv32 = rx->tkip_iv32;
b0f76b33 HH	145	rx->key->u.tkip.rx[rx->queue].iv16 = rx->tkip_iv16;
50741ae0	146
9ae54c84	147	return RX_CONTINUE;
f0706e82 JB	148	}
	149
	150
e039fa4a	151	static int tkip_encrypt_skb(struct ieee80211_tx_data tx, struct sk_buff skb)
f0706e82 JB	152	{
	153	struct ieee80211_hdr hdr = (struct ieee80211_hdr ) skb->data;
	154	struct ieee80211_key *key = tx->key;
e039fa4a	155	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
d5184cac HH	156	unsigned int hdrlen;
d5184cac HH	157	int len, tail;
f0706e82 JB	158	u8 *pos;
f0706e82 JB	159
e039fa4a JB	160	info->control.icv_len = TKIP_ICV_LEN;
	161	info->control.iv_len = TKIP_IV_LEN;
	162
	163	if ((tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) &&
	164	!(tx->key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV)) {
	165	/* hwaccel - with no need for preallocated room for IV/ICV */
	166	info->control.hw_key = &tx->key->conf;
23c0752a	167	return 0;
e039fa4a JB	168	}
e039fa4a JB	169
d5184cac	170	hdrlen = ieee80211_hdrlen(hdr->frame_control);
f0706e82 JB	171	len = skb->len - hdrlen;
f0706e82 JB	172
11a843b7	173	if (tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)
23c0752a	174	tail = 0;
11a843b7	175	else
23c0752a JB	176	tail = TKIP_ICV_LEN;
	177
	178	if (WARN_ON(skb_tailroom(skb) < tail \|\|
	179	skb_headroom(skb) < TKIP_IV_LEN))
	180	return -1;
f0706e82 JB	181
	182	pos = skb_push(skb, TKIP_IV_LEN);
	183	memmove(pos, pos + TKIP_IV_LEN, hdrlen);
	184	pos += hdrlen;
	185
	186	/* Increase IV for the frame */
b0f76b33 HH	187	key->u.tkip.tx.iv16++;
	188	if (key->u.tkip.tx.iv16 == 0)
	189	key->u.tkip.tx.iv32++;
f0706e82	190
11a843b7	191	if (tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) {
f0706e82	192	/* hwaccel - with preallocated room for IV */
c801242c	193	ieee80211_tkip_add_iv(pos, key, key->u.tkip.tx.iv16);
f0706e82	194
e039fa4a	195	info->control.hw_key = &tx->key->conf;
f0706e82 JB	196	return 0;
	197	}
	198
	199	/* Add room for ICV */
	200	skb_put(skb, TKIP_ICV_LEN);
	201
	202	hdr = (struct ieee80211_hdr *) skb->data;
	203	ieee80211_tkip_encrypt_data(tx->local->wep_tx_tfm,
	204	key, pos, len, hdr->addr2);
	205	return 0;
	206	}
	207
	208
9ae54c84	209	ieee80211_tx_result
5cf121c3	210	ieee80211_crypto_tkip_encrypt(struct ieee80211_tx_data *tx)
f0706e82	211	{
f0706e82	212	struct sk_buff *skb = tx->skb;
f0706e82	213
5cf121c3	214	ieee80211_tx_set_protected(tx);
f0706e82	215
e039fa4a	216	if (tkip_encrypt_skb(tx, skb) < 0)
9ae54c84	217	return TX_DROP;
f0706e82	218
5cf121c3	219	if (tx->extra_frag) {
f0706e82	220	int i;
5cf121c3	221	for (i = 0; i < tx->num_extra_frag; i++) {
e039fa4a	222	if (tkip_encrypt_skb(tx, tx->extra_frag[i]) < 0)
9ae54c84	223	return TX_DROP;
f0706e82 JB	224	}
	225	}
	226
9ae54c84	227	return TX_CONTINUE;
f0706e82 JB	228	}
	229
	230
9ae54c84	231	ieee80211_rx_result
5cf121c3	232	ieee80211_crypto_tkip_decrypt(struct ieee80211_rx_data *rx)
f0706e82 JB	233	{
f0706e82 JB	234	struct ieee80211_hdr hdr = (struct ieee80211_hdr ) rx->skb->data;
f0706e82 JB	235	int hdrlen, res, hwaccel = 0, wpa_test = 0;
	236	struct ieee80211_key *key = rx->key;
	237	struct sk_buff *skb = rx->skb;
0795af57	238	DECLARE_MAC_BUF(mac);
f0706e82	239
d5184cac	240	hdrlen = ieee80211_hdrlen(hdr->frame_control);
f0706e82	241
4f0d18e2	242	if ((rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA)
9ae54c84	243	return RX_CONTINUE;
f0706e82 JB	244
f0706e82 JB	245	if (!rx->sta \|\| skb->len - hdrlen < 12)
e4c26add	246	return RX_DROP_UNUSABLE;
f0706e82	247
5cf121c3 JB	248	if (rx->status->flag & RX_FLAG_DECRYPTED) {
5cf121c3 JB	249	if (rx->status->flag & RX_FLAG_IV_STRIPPED) {
7848ba7d JB	250	/*
	251	* Hardware took care of all processing, including
	252	* replay protection, and stripped the ICV/IV so
	253	* we cannot do any checks here.
	254	*/
9ae54c84	255	return RX_CONTINUE;
f0706e82 JB	256	}
	257
	258	/* let TKIP code verify IV, but skip decryption */
	259	hwaccel = 1;
	260	}
	261
	262	res = ieee80211_tkip_decrypt_data(rx->local->wep_rx_tfm,
	263	key, skb->data + hdrlen,
	264	skb->len - hdrlen, rx->sta->addr,
9ae4fda3	265	hdr->addr1, hwaccel, rx->queue,
5cf121c3 JB	266	&rx->tkip_iv32,
5cf121c3 JB	267	&rx->tkip_iv16);
f4ea83dd	268	if (res != TKIP_DECRYPT_OK \|\| wpa_test)
e4c26add	269	return RX_DROP_UNUSABLE;
f0706e82 JB	270
	271	/* Trim ICV */
	272	skb_trim(skb, skb->len - TKIP_ICV_LEN);
	273
	274	/* Remove IV */
	275	memmove(skb->data + TKIP_IV_LEN, skb->data, hdrlen);
	276	skb_pull(skb, TKIP_IV_LEN);
	277
9ae54c84	278	return RX_CONTINUE;
f0706e82 JB	279	}
	280
	281
	282	static void ccmp_special_blocks(struct sk_buff skb, u8 pn, u8 b_0, u8 aad,
	283	int encrypted)
	284	{
f14df804 HH	285	__le16 mask_fc;
	286	int a4_included;
	287	u8 qos_tid;
	288	u16 data_len, len_a;
	289	unsigned int hdrlen;
	290	struct ieee80211_hdr hdr = (struct ieee80211_hdr )skb->data;
f0706e82	291
f14df804 HH	292	/*
	293	* Mask FC: zero subtype b4 b5 b6
	294	* Retry, PwrMgt, MoreData; set Protected
	295	*/
	296	mask_fc = hdr->frame_control;
	297	mask_fc &= ~cpu_to_le16(0x0070 \| IEEE80211_FCTL_RETRY \|
	298	IEEE80211_FCTL_PM \| IEEE80211_FCTL_MOREDATA);
	299	mask_fc \|= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
	300
	301	hdrlen = ieee80211_hdrlen(hdr->frame_control);
	302	len_a = hdrlen - 2;
	303	a4_included = ieee80211_has_a4(hdr->frame_control);
f0706e82	304
f14df804 HH	305	if (ieee80211_is_data_qos(hdr->frame_control))
	306	qos_tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
	307	else
	308	qos_tid = 0;
	309
	310	data_len = skb->len - hdrlen - CCMP_HDR_LEN;
	311	if (encrypted)
	312	data_len -= CCMP_MIC_LEN;
	313
	314	/* First block, b_0 */
f0706e82 JB	315	b_0[0] = 0x59; /* flags: Adata: 1, M: 011, L: 001 */
	316	/* Nonce: QoS Priority \| A2 \| PN */
	317	b_0[1] = qos_tid;
73e1f7c8	318	memcpy(&b_0[2], hdr->addr2, ETH_ALEN);
f0706e82 JB	319	memcpy(&b_0[8], pn, CCMP_PN_LEN);
f0706e82 JB	320	/* l(m) */
f14df804	321	put_unaligned_be16(data_len, &b_0[14]);
f0706e82 JB	322
	323	/* AAD (extra authenticate-only data) / masked 802.11 header
	324	* FC \| A1 \| A2 \| A3 \| SC \| [A4] \| [QC] */
f14df804 HH	325	put_unaligned_be16(len_a, &aad[0]);
f14df804 HH	326	put_unaligned(mask_fc, (__le16 *)&aad[2]);
73e1f7c8	327	memcpy(&aad[4], &hdr->addr1, 3 * ETH_ALEN);
f0706e82 JB	328
	329	/* Mask Seq#, leave Frag# */
	330	aad[22] = ((u8 ) &hdr->seq_ctrl) & 0x0f;
	331	aad[23] = 0;
f14df804	332
f0706e82	333	if (a4_included) {
73e1f7c8	334	memcpy(&aad[24], hdr->addr4, ETH_ALEN);
f14df804	335	aad[30] = qos_tid;
f0706e82	336	aad[31] = 0;
f14df804	337	} else {
73e1f7c8	338	memset(&aad[24], 0, ETH_ALEN + IEEE80211_QOS_CTL_LEN);
f14df804	339	aad[24] = qos_tid;
f0706e82 JB	340	}
	341	}
	342
	343
	344	static inline void ccmp_pn2hdr(u8 hdr, u8 pn, int key_id)
	345	{
	346	hdr[0] = pn[5];
	347	hdr[1] = pn[4];
	348	hdr[2] = 0;
	349	hdr[3] = 0x20 \| (key_id << 6);
	350	hdr[4] = pn[3];
	351	hdr[5] = pn[2];
	352	hdr[6] = pn[1];
	353	hdr[7] = pn[0];
	354	}
	355
	356
	357	static inline int ccmp_hdr2pn(u8 pn, u8 hdr)
	358	{
	359	pn[0] = hdr[7];
	360	pn[1] = hdr[6];
	361	pn[2] = hdr[5];
	362	pn[3] = hdr[4];
	363	pn[4] = hdr[1];
	364	pn[5] = hdr[0];
	365	return (hdr[3] >> 6) & 0x03;
	366	}
	367
	368
e039fa4a	369	static int ccmp_encrypt_skb(struct ieee80211_tx_data tx, struct sk_buff skb)
f0706e82 JB	370	{
	371	struct ieee80211_hdr hdr = (struct ieee80211_hdr ) skb->data;
	372	struct ieee80211_key *key = tx->key;
e039fa4a	373	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
23c0752a	374	int hdrlen, len, tail;
f0706e82 JB	375	u8 pos, pn, b_0, aad, *scratch;
	376	int i;
	377
e039fa4a JB	378	info->control.icv_len = CCMP_MIC_LEN;
	379	info->control.iv_len = CCMP_HDR_LEN;
	380
	381	if ((tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) &&
	382	!(tx->key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV)) {
	383	/* hwaccel - with no need for preallocated room for CCMP "
	384	* header or MIC fields */
	385	info->control.hw_key = &tx->key->conf;
23c0752a	386	return 0;
e039fa4a JB	387	}
e039fa4a JB	388
f0706e82 JB	389	scratch = key->u.ccmp.tx_crypto_buf;
	390	b_0 = scratch + 3 * AES_BLOCK_LEN;
	391	aad = scratch + 4 * AES_BLOCK_LEN;
	392
d5184cac	393	hdrlen = ieee80211_hdrlen(hdr->frame_control);
f0706e82 JB	394	len = skb->len - hdrlen;
f0706e82 JB	395
11a843b7	396	if (key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)
23c0752a	397	tail = 0;
11a843b7	398	else
23c0752a JB	399	tail = CCMP_MIC_LEN;
	400
	401	if (WARN_ON(skb_tailroom(skb) < tail \|\|
	402	skb_headroom(skb) < CCMP_HDR_LEN))
	403	return -1;
f0706e82 JB	404
	405	pos = skb_push(skb, CCMP_HDR_LEN);
	406	memmove(pos, pos + CCMP_HDR_LEN, hdrlen);
	407	hdr = (struct ieee80211_hdr *) pos;
	408	pos += hdrlen;
	409
	410	/* PN = PN + 1 */
	411	pn = key->u.ccmp.tx_pn;
	412
	413	for (i = CCMP_PN_LEN - 1; i >= 0; i--) {
	414	pn[i]++;
	415	if (pn[i])
	416	break;
	417	}
	418
8f20fc24	419	ccmp_pn2hdr(pos, pn, key->conf.keyidx);
f0706e82	420
11a843b7	421	if (key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) {
f0706e82	422	/* hwaccel - with preallocated room for CCMP header */
e039fa4a	423	info->control.hw_key = &tx->key->conf;
f0706e82 JB	424	return 0;
	425	}
	426
	427	pos += CCMP_HDR_LEN;
	428	ccmp_special_blocks(skb, pn, b_0, aad, 0);
	429	ieee80211_aes_ccm_encrypt(key->u.ccmp.tfm, scratch, b_0, aad, pos, len,
	430	pos, skb_put(skb, CCMP_MIC_LEN));
	431
	432	return 0;
	433	}
	434
	435
9ae54c84	436	ieee80211_tx_result
5cf121c3	437	ieee80211_crypto_ccmp_encrypt(struct ieee80211_tx_data *tx)
f0706e82	438	{
f0706e82	439	struct sk_buff *skb = tx->skb;
f0706e82	440
5cf121c3	441	ieee80211_tx_set_protected(tx);
f0706e82	442
e039fa4a	443	if (ccmp_encrypt_skb(tx, skb) < 0)
9ae54c84	444	return TX_DROP;
f0706e82	445
5cf121c3	446	if (tx->extra_frag) {
f0706e82	447	int i;
5cf121c3	448	for (i = 0; i < tx->num_extra_frag; i++) {
e039fa4a	449	if (ccmp_encrypt_skb(tx, tx->extra_frag[i]) < 0)
9ae54c84	450	return TX_DROP;
f0706e82 JB	451	}
	452	}
	453
9ae54c84	454	return TX_CONTINUE;
f0706e82 JB	455	}
	456
	457
9ae54c84	458	ieee80211_rx_result
5cf121c3	459	ieee80211_crypto_ccmp_decrypt(struct ieee80211_rx_data *rx)
f0706e82 JB	460	{
f0706e82 JB	461	struct ieee80211_hdr hdr = (struct ieee80211_hdr ) rx->skb->data;
f0706e82 JB	462	int hdrlen;
	463	struct ieee80211_key *key = rx->key;
	464	struct sk_buff *skb = rx->skb;
	465	u8 pn[CCMP_PN_LEN];
	466	int data_len;
0795af57	467	DECLARE_MAC_BUF(mac);
f0706e82	468
d5184cac	469	hdrlen = ieee80211_hdrlen(hdr->frame_control);
f0706e82	470
4f0d18e2	471	if ((rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA)
9ae54c84	472	return RX_CONTINUE;
f0706e82 JB	473
	474	data_len = skb->len - hdrlen - CCMP_HDR_LEN - CCMP_MIC_LEN;
	475	if (!rx->sta \|\| data_len < 0)
e4c26add	476	return RX_DROP_UNUSABLE;
f0706e82	477
5cf121c3 JB	478	if ((rx->status->flag & RX_FLAG_DECRYPTED) &&
5cf121c3 JB	479	(rx->status->flag & RX_FLAG_IV_STRIPPED))
9ae54c84	480	return RX_CONTINUE;
f0706e82 JB	481
	482	(void) ccmp_hdr2pn(pn, skb->data + hdrlen);
	483
5cf121c3	484	if (memcmp(pn, key->u.ccmp.rx_pn[rx->queue], CCMP_PN_LEN) <= 0) {
f0706e82	485	key->u.ccmp.replays++;
e4c26add	486	return RX_DROP_UNUSABLE;
f0706e82 JB	487	}
f0706e82 JB	488
5cf121c3	489	if (!(rx->status->flag & RX_FLAG_DECRYPTED)) {
7848ba7d	490	/* hardware didn't decrypt/verify MIC */
f0706e82 JB	491	u8 scratch, b_0, *aad;
	492
	493	scratch = key->u.ccmp.rx_crypto_buf;
	494	b_0 = scratch + 3 * AES_BLOCK_LEN;
	495	aad = scratch + 4 * AES_BLOCK_LEN;
	496
	497	ccmp_special_blocks(skb, pn, b_0, aad, 1);
	498
	499	if (ieee80211_aes_ccm_decrypt(
	500	key->u.ccmp.tfm, scratch, b_0, aad,
	501	skb->data + hdrlen + CCMP_HDR_LEN, data_len,
	502	skb->data + skb->len - CCMP_MIC_LEN,
	503	skb->data + hdrlen + CCMP_HDR_LEN)) {
e4c26add	504	return RX_DROP_UNUSABLE;
f0706e82 JB	505	}
	506	}
	507
5cf121c3	508	memcpy(key->u.ccmp.rx_pn[rx->queue], pn, CCMP_PN_LEN);
f0706e82 JB	509
	510	/* Remove CCMP header and MIC */
	511	skb_trim(skb, skb->len - CCMP_MIC_LEN);
	512	memmove(skb->data + CCMP_HDR_LEN, skb->data, hdrlen);
	513	skb_pull(skb, CCMP_HDR_LEN);
	514
9ae54c84	515	return RX_CONTINUE;
f0706e82	516	}