[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;

	/*
	 * 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;

	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;

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