[deliverable/linux.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;
	struct sk_buff *skb = tx->skb;
	int authenticator;
	int wpa_test = 0;
	int tail;

	hdr = (struct ieee80211_hdr *)skb->data;
	if (!tx->key || tx->key->conf.alg != ALG_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 ((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;
	u8 mic[MICHAEL_MIC_LEN];
	struct sk_buff *skb = rx->skb;
	int authenticator = 1, wpa_test = 0;
	DECLARE_MAC_BUF(mac);

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

	hdr = (struct ieee80211_hdr *)skb->data;
	if (!rx->key || rx->key->conf.alg != ALG_TKIP ||
	    !ieee80211_has_protected(hdr->frame_control) ||
	    !ieee80211_is_data_present(hdr->frame_control))
		return RX_CONTINUE;

	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->sdata, 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;

	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 (!ieee80211_is_data(hdr->frame_control))
		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->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 *scratch,
				int encrypted)
{
	__le16 mask_fc;
	int a4_included;
	u8 qos_tid;
	u8 *b_0, *aad;
	u16 data_len, len_a;
	unsigned int hdrlen;
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;

	b_0 = scratch + 3 * AES_BLOCK_LEN;
	aad = scratch + 4 * AES_BLOCK_LEN;

	/*
	 * 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;
	int i;

	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;
	}

	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, key->u.ccmp.tx_crypto_buf, 0);
	ieee80211_aes_ccm_encrypt(key->u.ccmp.tfm, key->u.ccmp.tx_crypto_buf, 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 (!ieee80211_is_data(hdr->frame_control))
		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 */
		ccmp_special_blocks(skb, pn, key->u.ccmp.rx_crypto_buf, 1);

		if (ieee80211_aes_ccm_decrypt(
			    key->u.ccmp.tfm, key->u.ccmp.rx_crypto_buf,
			    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	struct sk_buff *skb = tx->skb;
	32	int authenticator;
	33	int wpa_test = 0;
23c0752a	34	int tail;
f0706e82	35
c34498b9	36	hdr = (struct ieee80211_hdr *)skb->data;
8f20fc24	37	if (!tx->key \|\| tx->key->conf.alg != ALG_TKIP \|\| skb->len < 24 \|\|
c34498b9	38	!ieee80211_is_data_present(hdr->frame_control))
9ae54c84	39	return TX_CONTINUE;
f0706e82	40
8e8862b7 HH	41	hdrlen = ieee80211_hdrlen(hdr->frame_control);
8e8862b7 HH	42	if (skb->len < hdrlen)
9ae54c84	43	return TX_DROP;
f0706e82	44
8e8862b7 HH	45	data = skb->data + hdrlen;
	46	data_len = skb->len - hdrlen;
	47
11a843b7	48	if ((tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) &&
5cf121c3	49	!(tx->flags & IEEE80211_TX_FRAGMENTED) &&
7848ba7d	50	!(tx->key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC) &&
f0706e82 JB	51	!wpa_test) {
	52	/* hwaccel - with no need for preallocated room for Michael MIC
	53	*/
9ae54c84	54	return TX_CONTINUE;
f0706e82 JB	55	}
f0706e82 JB	56
23c0752a JB	57	tail = MICHAEL_MIC_LEN;
	58	if (!(tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
	59	tail += TKIP_ICV_LEN;
	60
	61	if (WARN_ON(skb_tailroom(skb) < tail \|\|
	62	skb_headroom(skb) < TKIP_IV_LEN))
	63	return TX_DROP;
f0706e82 JB	64
	65	#if 0
	66	authenticator = fc & IEEE80211_FCTL_FROMDS; /* FIX */
	67	#else
	68	authenticator = 1;
	69	#endif
ffd7891d LR	70	/* At this point we know we're using ALG_TKIP. To get the MIC key
	71	* we now will rely on the offset from the ieee80211_key_conf::key */
	72	key_offset = authenticator ?
	73	NL80211_TKIP_DATA_OFFSET_TX_MIC_KEY :
	74	NL80211_TKIP_DATA_OFFSET_RX_MIC_KEY;
	75	key = &tx->key->conf.key[key_offset];
f0706e82	76	mic = skb_put(skb, MICHAEL_MIC_LEN);
8e8862b7	77	michael_mic(key, hdr, data, data_len, mic);
f0706e82	78
9ae54c84	79	return TX_CONTINUE;
f0706e82 JB	80	}
	81
	82
9ae54c84	83	ieee80211_rx_result
5cf121c3	84	ieee80211_rx_h_michael_mic_verify(struct ieee80211_rx_data *rx)
f0706e82	85	{
8e8862b7	86	u8 data, key = NULL, key_offset;
f0706e82	87	size_t data_len;
8e8862b7 HH	88	unsigned int hdrlen;
8e8862b7 HH	89	struct ieee80211_hdr *hdr;
f0706e82 JB	90	u8 mic[MICHAEL_MIC_LEN];
	91	struct sk_buff *skb = rx->skb;
	92	int authenticator = 1, wpa_test = 0;
0795af57	93	DECLARE_MAC_BUF(mac);
f0706e82	94
3017b80b JB	95	/*
	96	* No way to verify the MIC if the hardware stripped it
	97	*/
5cf121c3	98	if (rx->status->flag & RX_FLAG_MMIC_STRIPPED)
9ae54c84	99	return RX_CONTINUE;
f0706e82	100
c34498b9	101	hdr = (struct ieee80211_hdr *)skb->data;
8f20fc24	102	if (!rx->key \|\| rx->key->conf.alg != ALG_TKIP \|\|
c34498b9 HH	103	!ieee80211_has_protected(hdr->frame_control) \|\|
c34498b9 HH	104	!ieee80211_is_data_present(hdr->frame_control))
9ae54c84	105	return RX_CONTINUE;
f0706e82	106
8e8862b7 HH	107	hdrlen = ieee80211_hdrlen(hdr->frame_control);
8e8862b7 HH	108	if (skb->len < hdrlen + MICHAEL_MIC_LEN)
e4c26add	109	return RX_DROP_UNUSABLE;
f0706e82	110
8e8862b7 HH	111	data = skb->data + hdrlen;
8e8862b7 HH	112	data_len = skb->len - hdrlen - MICHAEL_MIC_LEN;
f0706e82 JB	113
	114	#if 0
	115	authenticator = fc & IEEE80211_FCTL_TODS; /* FIX */
	116	#else
	117	authenticator = 1;
	118	#endif
ffd7891d LR	119	/* At this point we know we're using ALG_TKIP. To get the MIC key
	120	* we now will rely on the offset from the ieee80211_key_conf::key */
	121	key_offset = authenticator ?
	122	NL80211_TKIP_DATA_OFFSET_RX_MIC_KEY :
	123	NL80211_TKIP_DATA_OFFSET_TX_MIC_KEY;
	124	key = &rx->key->conf.key[key_offset];
8e8862b7	125	michael_mic(key, hdr, data, data_len, mic);
f0706e82	126	if (memcmp(mic, data + data_len, MICHAEL_MIC_LEN) != 0 \|\| wpa_test) {
5cf121c3	127	if (!(rx->flags & IEEE80211_RX_RA_MATCH))
e4c26add	128	return RX_DROP_UNUSABLE;
f0706e82	129
f698d856	130	mac80211_ev_michael_mic_failure(rx->sdata, rx->key->conf.keyidx,
eb063c17	131	(void *) skb->data);
e4c26add	132	return RX_DROP_UNUSABLE;
f0706e82 JB	133	}
f0706e82 JB	134
f0706e82 JB	135	/* remove Michael MIC from payload */
	136	skb_trim(skb, skb->len - MICHAEL_MIC_LEN);
	137
50741ae0	138	/* update IV in key information to be able to detect replays */
b0f76b33 HH	139	rx->key->u.tkip.rx[rx->queue].iv32 = rx->tkip_iv32;
b0f76b33 HH	140	rx->key->u.tkip.rx[rx->queue].iv16 = rx->tkip_iv16;
50741ae0	141
9ae54c84	142	return RX_CONTINUE;
f0706e82 JB	143	}
	144
	145
e039fa4a	146	static int tkip_encrypt_skb(struct ieee80211_tx_data tx, struct sk_buff skb)
f0706e82 JB	147	{
	148	struct ieee80211_hdr hdr = (struct ieee80211_hdr ) skb->data;
	149	struct ieee80211_key *key = tx->key;
e039fa4a	150	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
d5184cac HH	151	unsigned int hdrlen;
d5184cac HH	152	int len, tail;
f0706e82 JB	153	u8 *pos;
f0706e82 JB	154
e039fa4a JB	155	if ((tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) &&
	156	!(tx->key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV)) {
	157	/* hwaccel - with no need for preallocated room for IV/ICV */
	158	info->control.hw_key = &tx->key->conf;
23c0752a	159	return 0;
e039fa4a JB	160	}
e039fa4a JB	161
d5184cac	162	hdrlen = ieee80211_hdrlen(hdr->frame_control);
f0706e82 JB	163	len = skb->len - hdrlen;
f0706e82 JB	164
11a843b7	165	if (tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)
23c0752a	166	tail = 0;
11a843b7	167	else
23c0752a JB	168	tail = TKIP_ICV_LEN;
	169
	170	if (WARN_ON(skb_tailroom(skb) < tail \|\|
	171	skb_headroom(skb) < TKIP_IV_LEN))
	172	return -1;
f0706e82 JB	173
	174	pos = skb_push(skb, TKIP_IV_LEN);
	175	memmove(pos, pos + TKIP_IV_LEN, hdrlen);
	176	pos += hdrlen;
	177
	178	/* Increase IV for the frame */
b0f76b33 HH	179	key->u.tkip.tx.iv16++;
	180	if (key->u.tkip.tx.iv16 == 0)
	181	key->u.tkip.tx.iv32++;
f0706e82	182
11a843b7	183	if (tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) {
f0706e82	184	/* hwaccel - with preallocated room for IV */
c801242c	185	ieee80211_tkip_add_iv(pos, key, key->u.tkip.tx.iv16);
f0706e82	186
e039fa4a	187	info->control.hw_key = &tx->key->conf;
f0706e82 JB	188	return 0;
	189	}
	190
	191	/* Add room for ICV */
	192	skb_put(skb, TKIP_ICV_LEN);
	193
	194	hdr = (struct ieee80211_hdr *) skb->data;
	195	ieee80211_tkip_encrypt_data(tx->local->wep_tx_tfm,
	196	key, pos, len, hdr->addr2);
	197	return 0;
	198	}
	199
	200
9ae54c84	201	ieee80211_tx_result
5cf121c3	202	ieee80211_crypto_tkip_encrypt(struct ieee80211_tx_data *tx)
f0706e82	203	{
f0706e82	204	struct sk_buff *skb = tx->skb;
f0706e82	205
5cf121c3	206	ieee80211_tx_set_protected(tx);
f0706e82	207
e039fa4a	208	if (tkip_encrypt_skb(tx, skb) < 0)
9ae54c84	209	return TX_DROP;
f0706e82	210
5cf121c3	211	if (tx->extra_frag) {
f0706e82	212	int i;
5cf121c3	213	for (i = 0; i < tx->num_extra_frag; i++) {
e039fa4a	214	if (tkip_encrypt_skb(tx, tx->extra_frag[i]) < 0)
9ae54c84	215	return TX_DROP;
f0706e82 JB	216	}
	217	}
	218
9ae54c84	219	return TX_CONTINUE;
f0706e82 JB	220	}
	221
	222
9ae54c84	223	ieee80211_rx_result
5cf121c3	224	ieee80211_crypto_tkip_decrypt(struct ieee80211_rx_data *rx)
f0706e82 JB	225	{
f0706e82 JB	226	struct ieee80211_hdr hdr = (struct ieee80211_hdr ) rx->skb->data;
f0706e82 JB	227	int hdrlen, res, hwaccel = 0, wpa_test = 0;
	228	struct ieee80211_key *key = rx->key;
	229	struct sk_buff *skb = rx->skb;
0795af57	230	DECLARE_MAC_BUF(mac);
f0706e82	231
d5184cac	232	hdrlen = ieee80211_hdrlen(hdr->frame_control);
f0706e82	233
c34498b9	234	if (!ieee80211_is_data(hdr->frame_control))
9ae54c84	235	return RX_CONTINUE;
f0706e82 JB	236
f0706e82 JB	237	if (!rx->sta \|\| skb->len - hdrlen < 12)
e4c26add	238	return RX_DROP_UNUSABLE;
f0706e82	239
5cf121c3 JB	240	if (rx->status->flag & RX_FLAG_DECRYPTED) {
5cf121c3 JB	241	if (rx->status->flag & RX_FLAG_IV_STRIPPED) {
7848ba7d JB	242	/*
	243	* Hardware took care of all processing, including
	244	* replay protection, and stripped the ICV/IV so
	245	* we cannot do any checks here.
	246	*/
9ae54c84	247	return RX_CONTINUE;
f0706e82 JB	248	}
	249
	250	/* let TKIP code verify IV, but skip decryption */
	251	hwaccel = 1;
	252	}
	253
	254	res = ieee80211_tkip_decrypt_data(rx->local->wep_rx_tfm,
	255	key, skb->data + hdrlen,
17741cdc	256	skb->len - hdrlen, rx->sta->sta.addr,
9ae4fda3	257	hdr->addr1, hwaccel, rx->queue,
5cf121c3 JB	258	&rx->tkip_iv32,
5cf121c3 JB	259	&rx->tkip_iv16);
f4ea83dd	260	if (res != TKIP_DECRYPT_OK \|\| wpa_test)
e4c26add	261	return RX_DROP_UNUSABLE;
f0706e82 JB	262
	263	/* Trim ICV */
	264	skb_trim(skb, skb->len - TKIP_ICV_LEN);
	265
	266	/* Remove IV */
	267	memmove(skb->data + TKIP_IV_LEN, skb->data, hdrlen);
	268	skb_pull(skb, TKIP_IV_LEN);
	269
9ae54c84	270	return RX_CONTINUE;
f0706e82 JB	271	}
	272
	273
feccb466	274	static void ccmp_special_blocks(struct sk_buff skb, u8 pn, u8 *scratch,
f0706e82 JB	275	int encrypted)
f0706e82 JB	276	{
f14df804 HH	277	__le16 mask_fc;
	278	int a4_included;
	279	u8 qos_tid;
feccb466	280	u8 b_0, aad;
f14df804 HH	281	u16 data_len, len_a;
	282	unsigned int hdrlen;
	283	struct ieee80211_hdr hdr = (struct ieee80211_hdr )skb->data;
f0706e82	284
feccb466 HH	285	b_0 = scratch + 3 * AES_BLOCK_LEN;
	286	aad = scratch + 4 * AES_BLOCK_LEN;
	287
f14df804 HH	288	/*
	289	* Mask FC: zero subtype b4 b5 b6
	290	* Retry, PwrMgt, MoreData; set Protected
	291	*/
	292	mask_fc = hdr->frame_control;
	293	mask_fc &= ~cpu_to_le16(0x0070 \| IEEE80211_FCTL_RETRY \|
	294	IEEE80211_FCTL_PM \| IEEE80211_FCTL_MOREDATA);
	295	mask_fc \|= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
	296
	297	hdrlen = ieee80211_hdrlen(hdr->frame_control);
	298	len_a = hdrlen - 2;
	299	a4_included = ieee80211_has_a4(hdr->frame_control);
f0706e82	300
f14df804 HH	301	if (ieee80211_is_data_qos(hdr->frame_control))
	302	qos_tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
	303	else
	304	qos_tid = 0;
	305
	306	data_len = skb->len - hdrlen - CCMP_HDR_LEN;
	307	if (encrypted)
	308	data_len -= CCMP_MIC_LEN;
	309
	310	/* First block, b_0 */
f0706e82 JB	311	b_0[0] = 0x59; /* flags: Adata: 1, M: 011, L: 001 */
	312	/* Nonce: QoS Priority \| A2 \| PN */
	313	b_0[1] = qos_tid;
73e1f7c8	314	memcpy(&b_0[2], hdr->addr2, ETH_ALEN);
f0706e82 JB	315	memcpy(&b_0[8], pn, CCMP_PN_LEN);
f0706e82 JB	316	/* l(m) */
f14df804	317	put_unaligned_be16(data_len, &b_0[14]);
f0706e82 JB	318
	319	/* AAD (extra authenticate-only data) / masked 802.11 header
	320	* FC \| A1 \| A2 \| A3 \| SC \| [A4] \| [QC] */
f14df804 HH	321	put_unaligned_be16(len_a, &aad[0]);
f14df804 HH	322	put_unaligned(mask_fc, (__le16 *)&aad[2]);
73e1f7c8	323	memcpy(&aad[4], &hdr->addr1, 3 * ETH_ALEN);
f0706e82 JB	324
	325	/* Mask Seq#, leave Frag# */
	326	aad[22] = ((u8 ) &hdr->seq_ctrl) & 0x0f;
	327	aad[23] = 0;
f14df804	328
f0706e82	329	if (a4_included) {
73e1f7c8	330	memcpy(&aad[24], hdr->addr4, ETH_ALEN);
f14df804	331	aad[30] = qos_tid;
f0706e82	332	aad[31] = 0;
f14df804	333	} else {
73e1f7c8	334	memset(&aad[24], 0, ETH_ALEN + IEEE80211_QOS_CTL_LEN);
f14df804	335	aad[24] = qos_tid;
f0706e82 JB	336	}
	337	}
	338
	339
	340	static inline void ccmp_pn2hdr(u8 hdr, u8 pn, int key_id)
	341	{
	342	hdr[0] = pn[5];
	343	hdr[1] = pn[4];
	344	hdr[2] = 0;
	345	hdr[3] = 0x20 \| (key_id << 6);
	346	hdr[4] = pn[3];
	347	hdr[5] = pn[2];
	348	hdr[6] = pn[1];
	349	hdr[7] = pn[0];
	350	}
	351
	352
	353	static inline int ccmp_hdr2pn(u8 pn, u8 hdr)
	354	{
	355	pn[0] = hdr[7];
	356	pn[1] = hdr[6];
	357	pn[2] = hdr[5];
	358	pn[3] = hdr[4];
	359	pn[4] = hdr[1];
	360	pn[5] = hdr[0];
	361	return (hdr[3] >> 6) & 0x03;
	362	}
	363
	364
e039fa4a	365	static int ccmp_encrypt_skb(struct ieee80211_tx_data tx, struct sk_buff skb)
f0706e82 JB	366	{
	367	struct ieee80211_hdr hdr = (struct ieee80211_hdr ) skb->data;
	368	struct ieee80211_key *key = tx->key;
e039fa4a	369	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
23c0752a	370	int hdrlen, len, tail;
feccb466	371	u8 pos, pn;
f0706e82 JB	372	int i;
f0706e82 JB	373
e039fa4a JB	374	if ((tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) &&
	375	!(tx->key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV)) {
	376	/* hwaccel - with no need for preallocated room for CCMP "
	377	* header or MIC fields */
	378	info->control.hw_key = &tx->key->conf;
23c0752a	379	return 0;
e039fa4a JB	380	}
e039fa4a JB	381
d5184cac	382	hdrlen = ieee80211_hdrlen(hdr->frame_control);
f0706e82 JB	383	len = skb->len - hdrlen;
f0706e82 JB	384
11a843b7	385	if (key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)
23c0752a	386	tail = 0;
11a843b7	387	else
23c0752a JB	388	tail = CCMP_MIC_LEN;
	389
	390	if (WARN_ON(skb_tailroom(skb) < tail \|\|
	391	skb_headroom(skb) < CCMP_HDR_LEN))
	392	return -1;
f0706e82 JB	393
	394	pos = skb_push(skb, CCMP_HDR_LEN);
	395	memmove(pos, pos + CCMP_HDR_LEN, hdrlen);
	396	hdr = (struct ieee80211_hdr *) pos;
	397	pos += hdrlen;
	398
	399	/* PN = PN + 1 */
	400	pn = key->u.ccmp.tx_pn;
	401
	402	for (i = CCMP_PN_LEN - 1; i >= 0; i--) {
	403	pn[i]++;
	404	if (pn[i])
	405	break;
	406	}
	407
8f20fc24	408	ccmp_pn2hdr(pos, pn, key->conf.keyidx);
f0706e82	409
11a843b7	410	if (key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) {
f0706e82	411	/* hwaccel - with preallocated room for CCMP header */
e039fa4a	412	info->control.hw_key = &tx->key->conf;
f0706e82 JB	413	return 0;
	414	}
	415
	416	pos += CCMP_HDR_LEN;
feccb466 HH	417	ccmp_special_blocks(skb, pn, key->u.ccmp.tx_crypto_buf, 0);
feccb466 HH	418	ieee80211_aes_ccm_encrypt(key->u.ccmp.tfm, key->u.ccmp.tx_crypto_buf, pos, len,
f0706e82 JB	419	pos, skb_put(skb, CCMP_MIC_LEN));
	420
	421	return 0;
	422	}
	423
	424
9ae54c84	425	ieee80211_tx_result
5cf121c3	426	ieee80211_crypto_ccmp_encrypt(struct ieee80211_tx_data *tx)
f0706e82	427	{
f0706e82	428	struct sk_buff *skb = tx->skb;
f0706e82	429
5cf121c3	430	ieee80211_tx_set_protected(tx);
f0706e82	431
e039fa4a	432	if (ccmp_encrypt_skb(tx, skb) < 0)
9ae54c84	433	return TX_DROP;
f0706e82	434
5cf121c3	435	if (tx->extra_frag) {
f0706e82	436	int i;
5cf121c3	437	for (i = 0; i < tx->num_extra_frag; i++) {
e039fa4a	438	if (ccmp_encrypt_skb(tx, tx->extra_frag[i]) < 0)
9ae54c84	439	return TX_DROP;
f0706e82 JB	440	}
	441	}
	442
9ae54c84	443	return TX_CONTINUE;
f0706e82 JB	444	}
	445
	446
9ae54c84	447	ieee80211_rx_result
5cf121c3	448	ieee80211_crypto_ccmp_decrypt(struct ieee80211_rx_data *rx)
f0706e82	449	{
c34498b9	450	struct ieee80211_hdr hdr = (struct ieee80211_hdr )rx->skb->data;
f0706e82 JB	451	int hdrlen;
	452	struct ieee80211_key *key = rx->key;
	453	struct sk_buff *skb = rx->skb;
	454	u8 pn[CCMP_PN_LEN];
	455	int data_len;
0795af57	456	DECLARE_MAC_BUF(mac);
f0706e82	457
d5184cac	458	hdrlen = ieee80211_hdrlen(hdr->frame_control);
f0706e82	459
c34498b9	460	if (!ieee80211_is_data(hdr->frame_control))
9ae54c84	461	return RX_CONTINUE;
f0706e82 JB	462
	463	data_len = skb->len - hdrlen - CCMP_HDR_LEN - CCMP_MIC_LEN;
	464	if (!rx->sta \|\| data_len < 0)
e4c26add	465	return RX_DROP_UNUSABLE;
f0706e82	466
5cf121c3 JB	467	if ((rx->status->flag & RX_FLAG_DECRYPTED) &&
5cf121c3 JB	468	(rx->status->flag & RX_FLAG_IV_STRIPPED))
9ae54c84	469	return RX_CONTINUE;
f0706e82 JB	470
	471	(void) ccmp_hdr2pn(pn, skb->data + hdrlen);
	472
5cf121c3	473	if (memcmp(pn, key->u.ccmp.rx_pn[rx->queue], CCMP_PN_LEN) <= 0) {
f0706e82	474	key->u.ccmp.replays++;
e4c26add	475	return RX_DROP_UNUSABLE;
f0706e82 JB	476	}
f0706e82 JB	477
5cf121c3	478	if (!(rx->status->flag & RX_FLAG_DECRYPTED)) {
7848ba7d	479	/* hardware didn't decrypt/verify MIC */
feccb466	480	ccmp_special_blocks(skb, pn, key->u.ccmp.rx_crypto_buf, 1);
f0706e82 JB	481
f0706e82 JB	482	if (ieee80211_aes_ccm_decrypt(
feccb466	483	key->u.ccmp.tfm, key->u.ccmp.rx_crypto_buf,
f0706e82 JB	484	skb->data + hdrlen + CCMP_HDR_LEN, data_len,
	485	skb->data + skb->len - CCMP_MIC_LEN,
	486	skb->data + hdrlen + CCMP_HDR_LEN)) {
e4c26add	487	return RX_DROP_UNUSABLE;
f0706e82 JB	488	}
	489	}
	490
5cf121c3	491	memcpy(key->u.ccmp.rx_pn[rx->queue], pn, CCMP_PN_LEN);
f0706e82 JB	492
	493	/* Remove CCMP header and MIC */
	494	skb_trim(skb, skb->len - CCMP_MIC_LEN);
	495	memmove(skb->data + CCMP_HDR_LEN, skb->data, hdrlen);
	496	skb_pull(skb, CCMP_HDR_LEN);
	497
9ae54c84	498	return RX_CONTINUE;
f0706e82	499	}