[mirror_ubuntu-kernels.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->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 (!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->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;

	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;
	}

	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
8f20fc24	130	mac80211_ev_michael_mic_failure(rx->dev, 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	info->control.icv_len = TKIP_ICV_LEN;
	156	info->control.iv_len = TKIP_IV_LEN;
	157
	158	if ((tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) &&
	159	!(tx->key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV)) {
	160	/* hwaccel - with no need for preallocated room for IV/ICV */
	161	info->control.hw_key = &tx->key->conf;
23c0752a	162	return 0;
e039fa4a JB	163	}
e039fa4a JB	164
d5184cac	165	hdrlen = ieee80211_hdrlen(hdr->frame_control);
f0706e82 JB	166	len = skb->len - hdrlen;
f0706e82 JB	167
11a843b7	168	if (tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)
23c0752a	169	tail = 0;
11a843b7	170	else
23c0752a JB	171	tail = TKIP_ICV_LEN;
	172
	173	if (WARN_ON(skb_tailroom(skb) < tail \|\|
	174	skb_headroom(skb) < TKIP_IV_LEN))
	175	return -1;
f0706e82 JB	176
	177	pos = skb_push(skb, TKIP_IV_LEN);
	178	memmove(pos, pos + TKIP_IV_LEN, hdrlen);
	179	pos += hdrlen;
	180
	181	/* Increase IV for the frame */
b0f76b33 HH	182	key->u.tkip.tx.iv16++;
	183	if (key->u.tkip.tx.iv16 == 0)
	184	key->u.tkip.tx.iv32++;
f0706e82	185
11a843b7	186	if (tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) {
f0706e82	187	/* hwaccel - with preallocated room for IV */
c801242c	188	ieee80211_tkip_add_iv(pos, key, key->u.tkip.tx.iv16);
f0706e82	189
e039fa4a	190	info->control.hw_key = &tx->key->conf;
f0706e82 JB	191	return 0;
	192	}
	193
	194	/* Add room for ICV */
	195	skb_put(skb, TKIP_ICV_LEN);
	196
	197	hdr = (struct ieee80211_hdr *) skb->data;
	198	ieee80211_tkip_encrypt_data(tx->local->wep_tx_tfm,
	199	key, pos, len, hdr->addr2);
	200	return 0;
	201	}
	202
	203
9ae54c84	204	ieee80211_tx_result
5cf121c3	205	ieee80211_crypto_tkip_encrypt(struct ieee80211_tx_data *tx)
f0706e82	206	{
f0706e82	207	struct sk_buff *skb = tx->skb;
f0706e82	208
5cf121c3	209	ieee80211_tx_set_protected(tx);
f0706e82	210
e039fa4a	211	if (tkip_encrypt_skb(tx, skb) < 0)
9ae54c84	212	return TX_DROP;
f0706e82	213
5cf121c3	214	if (tx->extra_frag) {
f0706e82	215	int i;
5cf121c3	216	for (i = 0; i < tx->num_extra_frag; i++) {
e039fa4a	217	if (tkip_encrypt_skb(tx, tx->extra_frag[i]) < 0)
9ae54c84	218	return TX_DROP;
f0706e82 JB	219	}
	220	}
	221
9ae54c84	222	return TX_CONTINUE;
f0706e82 JB	223	}
	224
	225
9ae54c84	226	ieee80211_rx_result
5cf121c3	227	ieee80211_crypto_tkip_decrypt(struct ieee80211_rx_data *rx)
f0706e82 JB	228	{
f0706e82 JB	229	struct ieee80211_hdr hdr = (struct ieee80211_hdr ) rx->skb->data;
f0706e82 JB	230	int hdrlen, res, hwaccel = 0, wpa_test = 0;
	231	struct ieee80211_key *key = rx->key;
	232	struct sk_buff *skb = rx->skb;
0795af57	233	DECLARE_MAC_BUF(mac);
f0706e82	234
d5184cac	235	hdrlen = ieee80211_hdrlen(hdr->frame_control);
f0706e82	236
c34498b9	237	if (!ieee80211_is_data(hdr->frame_control))
9ae54c84	238	return RX_CONTINUE;
f0706e82 JB	239
f0706e82 JB	240	if (!rx->sta \|\| skb->len - hdrlen < 12)
e4c26add	241	return RX_DROP_UNUSABLE;
f0706e82	242
5cf121c3 JB	243	if (rx->status->flag & RX_FLAG_DECRYPTED) {
5cf121c3 JB	244	if (rx->status->flag & RX_FLAG_IV_STRIPPED) {
7848ba7d JB	245	/*
	246	* Hardware took care of all processing, including
	247	* replay protection, and stripped the ICV/IV so
	248	* we cannot do any checks here.
	249	*/
9ae54c84	250	return RX_CONTINUE;
f0706e82 JB	251	}
	252
	253	/* let TKIP code verify IV, but skip decryption */
	254	hwaccel = 1;
	255	}
	256
	257	res = ieee80211_tkip_decrypt_data(rx->local->wep_rx_tfm,
	258	key, skb->data + hdrlen,
	259	skb->len - hdrlen, rx->sta->addr,
9ae4fda3	260	hdr->addr1, hwaccel, rx->queue,
5cf121c3 JB	261	&rx->tkip_iv32,
5cf121c3 JB	262	&rx->tkip_iv16);
f4ea83dd	263	if (res != TKIP_DECRYPT_OK \|\| wpa_test)
e4c26add	264	return RX_DROP_UNUSABLE;
f0706e82 JB	265
	266	/* Trim ICV */
	267	skb_trim(skb, skb->len - TKIP_ICV_LEN);
	268
	269	/* Remove IV */
	270	memmove(skb->data + TKIP_IV_LEN, skb->data, hdrlen);
	271	skb_pull(skb, TKIP_IV_LEN);
	272
9ae54c84	273	return RX_CONTINUE;
f0706e82 JB	274	}
	275
	276
feccb466	277	static void ccmp_special_blocks(struct sk_buff skb, u8 pn, u8 *scratch,
f0706e82 JB	278	int encrypted)
f0706e82 JB	279	{
f14df804 HH	280	__le16 mask_fc;
	281	int a4_included;
	282	u8 qos_tid;
feccb466	283	u8 b_0, aad;
f14df804 HH	284	u16 data_len, len_a;
	285	unsigned int hdrlen;
	286	struct ieee80211_hdr hdr = (struct ieee80211_hdr )skb->data;
f0706e82	287
feccb466 HH	288	b_0 = scratch + 3 * AES_BLOCK_LEN;
	289	aad = scratch + 4 * AES_BLOCK_LEN;
	290
f14df804 HH	291	/*
	292	* Mask FC: zero subtype b4 b5 b6
	293	* Retry, PwrMgt, MoreData; set Protected
	294	*/
	295	mask_fc = hdr->frame_control;
	296	mask_fc &= ~cpu_to_le16(0x0070 \| IEEE80211_FCTL_RETRY \|
	297	IEEE80211_FCTL_PM \| IEEE80211_FCTL_MOREDATA);
	298	mask_fc \|= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
	299
	300	hdrlen = ieee80211_hdrlen(hdr->frame_control);
	301	len_a = hdrlen - 2;
	302	a4_included = ieee80211_has_a4(hdr->frame_control);
f0706e82	303
f14df804 HH	304	if (ieee80211_is_data_qos(hdr->frame_control))
	305	qos_tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
	306	else
	307	qos_tid = 0;
	308
	309	data_len = skb->len - hdrlen - CCMP_HDR_LEN;
	310	if (encrypted)
	311	data_len -= CCMP_MIC_LEN;
	312
	313	/* First block, b_0 */
f0706e82 JB	314	b_0[0] = 0x59; /* flags: Adata: 1, M: 011, L: 001 */
	315	/* Nonce: QoS Priority \| A2 \| PN */
	316	b_0[1] = qos_tid;
73e1f7c8	317	memcpy(&b_0[2], hdr->addr2, ETH_ALEN);
f0706e82 JB	318	memcpy(&b_0[8], pn, CCMP_PN_LEN);
f0706e82 JB	319	/* l(m) */
f14df804	320	put_unaligned_be16(data_len, &b_0[14]);
f0706e82 JB	321
	322	/* AAD (extra authenticate-only data) / masked 802.11 header
	323	* FC \| A1 \| A2 \| A3 \| SC \| [A4] \| [QC] */
f14df804 HH	324	put_unaligned_be16(len_a, &aad[0]);
f14df804 HH	325	put_unaligned(mask_fc, (__le16 *)&aad[2]);
73e1f7c8	326	memcpy(&aad[4], &hdr->addr1, 3 * ETH_ALEN);
f0706e82 JB	327
	328	/* Mask Seq#, leave Frag# */
	329	aad[22] = ((u8 ) &hdr->seq_ctrl) & 0x0f;
	330	aad[23] = 0;
f14df804	331
f0706e82	332	if (a4_included) {
73e1f7c8	333	memcpy(&aad[24], hdr->addr4, ETH_ALEN);
f14df804	334	aad[30] = qos_tid;
f0706e82	335	aad[31] = 0;
f14df804	336	} else {
73e1f7c8	337	memset(&aad[24], 0, ETH_ALEN + IEEE80211_QOS_CTL_LEN);
f14df804	338	aad[24] = qos_tid;
f0706e82 JB	339	}
	340	}
	341
	342
	343	static inline void ccmp_pn2hdr(u8 hdr, u8 pn, int key_id)
	344	{
	345	hdr[0] = pn[5];
	346	hdr[1] = pn[4];
	347	hdr[2] = 0;
	348	hdr[3] = 0x20 \| (key_id << 6);
	349	hdr[4] = pn[3];
	350	hdr[5] = pn[2];
	351	hdr[6] = pn[1];
	352	hdr[7] = pn[0];
	353	}
	354
	355
	356	static inline int ccmp_hdr2pn(u8 pn, u8 hdr)
	357	{
	358	pn[0] = hdr[7];
	359	pn[1] = hdr[6];
	360	pn[2] = hdr[5];
	361	pn[3] = hdr[4];
	362	pn[4] = hdr[1];
	363	pn[5] = hdr[0];
	364	return (hdr[3] >> 6) & 0x03;
	365	}
	366
	367
e039fa4a	368	static int ccmp_encrypt_skb(struct ieee80211_tx_data tx, struct sk_buff skb)
f0706e82 JB	369	{
	370	struct ieee80211_hdr hdr = (struct ieee80211_hdr ) skb->data;
	371	struct ieee80211_key *key = tx->key;
e039fa4a	372	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
23c0752a	373	int hdrlen, len, tail;
feccb466	374	u8 pos, pn;
f0706e82 JB	375	int i;
f0706e82 JB	376
e039fa4a JB	377	info->control.icv_len = CCMP_MIC_LEN;
	378	info->control.iv_len = CCMP_HDR_LEN;
	379
	380	if ((tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) &&
	381	!(tx->key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV)) {
	382	/* hwaccel - with no need for preallocated room for CCMP "
	383	* header or MIC fields */
	384	info->control.hw_key = &tx->key->conf;
23c0752a	385	return 0;
e039fa4a JB	386	}
e039fa4a JB	387
d5184cac	388	hdrlen = ieee80211_hdrlen(hdr->frame_control);
f0706e82 JB	389	len = skb->len - hdrlen;
f0706e82 JB	390
11a843b7	391	if (key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)
23c0752a	392	tail = 0;
11a843b7	393	else
23c0752a JB	394	tail = CCMP_MIC_LEN;
	395
	396	if (WARN_ON(skb_tailroom(skb) < tail \|\|
	397	skb_headroom(skb) < CCMP_HDR_LEN))
	398	return -1;
f0706e82 JB	399
	400	pos = skb_push(skb, CCMP_HDR_LEN);
	401	memmove(pos, pos + CCMP_HDR_LEN, hdrlen);
	402	hdr = (struct ieee80211_hdr *) pos;
	403	pos += hdrlen;
	404
	405	/* PN = PN + 1 */
	406	pn = key->u.ccmp.tx_pn;
	407
	408	for (i = CCMP_PN_LEN - 1; i >= 0; i--) {
	409	pn[i]++;
	410	if (pn[i])
	411	break;
	412	}
	413
8f20fc24	414	ccmp_pn2hdr(pos, pn, key->conf.keyidx);
f0706e82	415
11a843b7	416	if (key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) {
f0706e82	417	/* hwaccel - with preallocated room for CCMP header */
e039fa4a	418	info->control.hw_key = &tx->key->conf;
f0706e82 JB	419	return 0;
	420	}
	421
	422	pos += CCMP_HDR_LEN;
feccb466 HH	423	ccmp_special_blocks(skb, pn, key->u.ccmp.tx_crypto_buf, 0);
feccb466 HH	424	ieee80211_aes_ccm_encrypt(key->u.ccmp.tfm, key->u.ccmp.tx_crypto_buf, pos, len,
f0706e82 JB	425	pos, skb_put(skb, CCMP_MIC_LEN));
	426
	427	return 0;
	428	}
	429
	430
9ae54c84	431	ieee80211_tx_result
5cf121c3	432	ieee80211_crypto_ccmp_encrypt(struct ieee80211_tx_data *tx)
f0706e82	433	{
f0706e82	434	struct sk_buff *skb = tx->skb;
f0706e82	435
5cf121c3	436	ieee80211_tx_set_protected(tx);
f0706e82	437
e039fa4a	438	if (ccmp_encrypt_skb(tx, skb) < 0)
9ae54c84	439	return TX_DROP;
f0706e82	440
5cf121c3	441	if (tx->extra_frag) {
f0706e82	442	int i;
5cf121c3	443	for (i = 0; i < tx->num_extra_frag; i++) {
e039fa4a	444	if (ccmp_encrypt_skb(tx, tx->extra_frag[i]) < 0)
9ae54c84	445	return TX_DROP;
f0706e82 JB	446	}
	447	}
	448
9ae54c84	449	return TX_CONTINUE;
f0706e82 JB	450	}
	451
	452
9ae54c84	453	ieee80211_rx_result
5cf121c3	454	ieee80211_crypto_ccmp_decrypt(struct ieee80211_rx_data *rx)
f0706e82	455	{
c34498b9	456	struct ieee80211_hdr hdr = (struct ieee80211_hdr )rx->skb->data;
f0706e82 JB	457	int hdrlen;
	458	struct ieee80211_key *key = rx->key;
	459	struct sk_buff *skb = rx->skb;
	460	u8 pn[CCMP_PN_LEN];
	461	int data_len;
0795af57	462	DECLARE_MAC_BUF(mac);
f0706e82	463
d5184cac	464	hdrlen = ieee80211_hdrlen(hdr->frame_control);
f0706e82	465
c34498b9	466	if (!ieee80211_is_data(hdr->frame_control))
9ae54c84	467	return RX_CONTINUE;
f0706e82 JB	468
	469	data_len = skb->len - hdrlen - CCMP_HDR_LEN - CCMP_MIC_LEN;
	470	if (!rx->sta \|\| data_len < 0)
e4c26add	471	return RX_DROP_UNUSABLE;
f0706e82	472
5cf121c3 JB	473	if ((rx->status->flag & RX_FLAG_DECRYPTED) &&
5cf121c3 JB	474	(rx->status->flag & RX_FLAG_IV_STRIPPED))
9ae54c84	475	return RX_CONTINUE;
f0706e82 JB	476
	477	(void) ccmp_hdr2pn(pn, skb->data + hdrlen);
	478
5cf121c3	479	if (memcmp(pn, key->u.ccmp.rx_pn[rx->queue], CCMP_PN_LEN) <= 0) {
f0706e82	480	key->u.ccmp.replays++;
e4c26add	481	return RX_DROP_UNUSABLE;
f0706e82 JB	482	}
f0706e82 JB	483
5cf121c3	484	if (!(rx->status->flag & RX_FLAG_DECRYPTED)) {
7848ba7d	485	/* hardware didn't decrypt/verify MIC */
feccb466	486	ccmp_special_blocks(skb, pn, key->u.ccmp.rx_crypto_buf, 1);
f0706e82 JB	487
f0706e82 JB	488	if (ieee80211_aes_ccm_decrypt(
feccb466	489	key->u.ccmp.tfm, key->u.ccmp.rx_crypto_buf,
f0706e82 JB	490	skb->data + hdrlen + CCMP_HDR_LEN, data_len,
	491	skb->data + skb->len - CCMP_MIC_LEN,
	492	skb->data + hdrlen + CCMP_HDR_LEN)) {
e4c26add	493	return RX_DROP_UNUSABLE;
f0706e82 JB	494	}
	495	}
	496
5cf121c3	497	memcpy(key->u.ccmp.rx_pn[rx->queue], pn, CCMP_PN_LEN);
f0706e82 JB	498
	499	/* Remove CCMP header and MIC */
	500	skb_trim(skb, skb->len - CCMP_MIC_LEN);
	501	memmove(skb->data + CCMP_HDR_LEN, skb->data, hdrlen);
	502	skb_pull(skb, CCMP_HDR_LEN);
	503
9ae54c84	504	return RX_CONTINUE;
f0706e82	505	}