[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 MMIC */
		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
	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
	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;
	int i;

	ieee80211_tx_set_protected(tx);

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

	if (tx->extra_frag) {
		for (i = 0; i < tx->num_extra_frag; i++) {
			if (tkip_encrypt_skb(tx, tx->extra_frag[i]))
				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 void ccmp_hdr2pn(u8 *pn, u8 *hdr)
{
	pn[0] = hdr[7];
	pn[1] = hdr[6];
	pn[2] = hdr[5];
	pn[3] = hdr[4];
	pn[4] = hdr[1];
	pn[5] = hdr[0];
}


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;
	int i;

	ieee80211_tx_set_protected(tx);

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

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

	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	51	!wpa_test) {
c6a1fa12	52	/* hwaccel - with no need for preallocated room for MMIC */
9ae54c84	53	return TX_CONTINUE;
f0706e82 JB	54	}
f0706e82 JB	55
23c0752a JB	56	tail = MICHAEL_MIC_LEN;
	57	if (!(tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
	58	tail += TKIP_ICV_LEN;
	59
	60	if (WARN_ON(skb_tailroom(skb) < tail \|\|
	61	skb_headroom(skb) < TKIP_IV_LEN))
	62	return TX_DROP;
f0706e82 JB	63
	64	#if 0
	65	authenticator = fc & IEEE80211_FCTL_FROMDS; /* FIX */
	66	#else
	67	authenticator = 1;
	68	#endif
ffd7891d LR	69	key_offset = authenticator ?
	70	NL80211_TKIP_DATA_OFFSET_TX_MIC_KEY :
	71	NL80211_TKIP_DATA_OFFSET_RX_MIC_KEY;
	72	key = &tx->key->conf.key[key_offset];
f0706e82	73	mic = skb_put(skb, MICHAEL_MIC_LEN);
8e8862b7	74	michael_mic(key, hdr, data, data_len, mic);
f0706e82	75
9ae54c84	76	return TX_CONTINUE;
f0706e82 JB	77	}
	78
	79
9ae54c84	80	ieee80211_rx_result
5cf121c3	81	ieee80211_rx_h_michael_mic_verify(struct ieee80211_rx_data *rx)
f0706e82	82	{
8e8862b7	83	u8 data, key = NULL, key_offset;
f0706e82	84	size_t data_len;
8e8862b7 HH	85	unsigned int hdrlen;
8e8862b7 HH	86	struct ieee80211_hdr *hdr;
f0706e82 JB	87	u8 mic[MICHAEL_MIC_LEN];
	88	struct sk_buff *skb = rx->skb;
	89	int authenticator = 1, wpa_test = 0;
	90
c6a1fa12	91	/* No way to verify the MIC if the hardware stripped it */
5cf121c3	92	if (rx->status->flag & RX_FLAG_MMIC_STRIPPED)
9ae54c84	93	return RX_CONTINUE;
f0706e82	94
c34498b9	95	hdr = (struct ieee80211_hdr *)skb->data;
8f20fc24	96	if (!rx->key \|\| rx->key->conf.alg != ALG_TKIP \|\|
c34498b9 HH	97	!ieee80211_has_protected(hdr->frame_control) \|\|
c34498b9 HH	98	!ieee80211_is_data_present(hdr->frame_control))
9ae54c84	99	return RX_CONTINUE;
f0706e82	100
8e8862b7 HH	101	hdrlen = ieee80211_hdrlen(hdr->frame_control);
8e8862b7 HH	102	if (skb->len < hdrlen + MICHAEL_MIC_LEN)
e4c26add	103	return RX_DROP_UNUSABLE;
f0706e82	104
8e8862b7 HH	105	data = skb->data + hdrlen;
8e8862b7 HH	106	data_len = skb->len - hdrlen - MICHAEL_MIC_LEN;
f0706e82 JB	107
	108	#if 0
	109	authenticator = fc & IEEE80211_FCTL_TODS; /* FIX */
	110	#else
	111	authenticator = 1;
	112	#endif
ffd7891d LR	113	key_offset = authenticator ?
	114	NL80211_TKIP_DATA_OFFSET_RX_MIC_KEY :
	115	NL80211_TKIP_DATA_OFFSET_TX_MIC_KEY;
	116	key = &rx->key->conf.key[key_offset];
8e8862b7	117	michael_mic(key, hdr, data, data_len, mic);
f0706e82	118	if (memcmp(mic, data + data_len, MICHAEL_MIC_LEN) != 0 \|\| wpa_test) {
5cf121c3	119	if (!(rx->flags & IEEE80211_RX_RA_MATCH))
e4c26add	120	return RX_DROP_UNUSABLE;
f0706e82	121
f698d856	122	mac80211_ev_michael_mic_failure(rx->sdata, rx->key->conf.keyidx,
eb063c17	123	(void *) skb->data);
e4c26add	124	return RX_DROP_UNUSABLE;
f0706e82 JB	125	}
f0706e82 JB	126
f0706e82 JB	127	/* remove Michael MIC from payload */
	128	skb_trim(skb, skb->len - MICHAEL_MIC_LEN);
	129
50741ae0	130	/* update IV in key information to be able to detect replays */
b0f76b33 HH	131	rx->key->u.tkip.rx[rx->queue].iv32 = rx->tkip_iv32;
b0f76b33 HH	132	rx->key->u.tkip.rx[rx->queue].iv16 = rx->tkip_iv16;
50741ae0	133
9ae54c84	134	return RX_CONTINUE;
f0706e82 JB	135	}
	136
	137
e039fa4a	138	static int tkip_encrypt_skb(struct ieee80211_tx_data tx, struct sk_buff skb)
f0706e82 JB	139	{
	140	struct ieee80211_hdr hdr = (struct ieee80211_hdr ) skb->data;
	141	struct ieee80211_key *key = tx->key;
e039fa4a	142	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
d5184cac HH	143	unsigned int hdrlen;
d5184cac HH	144	int len, tail;
f0706e82 JB	145	u8 *pos;
f0706e82 JB	146
e039fa4a JB	147	if ((tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) &&
	148	!(tx->key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV)) {
	149	/* hwaccel - with no need for preallocated room for IV/ICV */
	150	info->control.hw_key = &tx->key->conf;
23c0752a	151	return 0;
e039fa4a JB	152	}
e039fa4a JB	153
d5184cac	154	hdrlen = ieee80211_hdrlen(hdr->frame_control);
f0706e82 JB	155	len = skb->len - hdrlen;
f0706e82 JB	156
11a843b7	157	if (tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)
23c0752a	158	tail = 0;
11a843b7	159	else
23c0752a JB	160	tail = TKIP_ICV_LEN;
	161
	162	if (WARN_ON(skb_tailroom(skb) < tail \|\|
	163	skb_headroom(skb) < TKIP_IV_LEN))
	164	return -1;
f0706e82 JB	165
	166	pos = skb_push(skb, TKIP_IV_LEN);
	167	memmove(pos, pos + TKIP_IV_LEN, hdrlen);
	168	pos += hdrlen;
	169
	170	/* Increase IV for the frame */
b0f76b33 HH	171	key->u.tkip.tx.iv16++;
	172	if (key->u.tkip.tx.iv16 == 0)
	173	key->u.tkip.tx.iv32++;
f0706e82	174
11a843b7	175	if (tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) {
f0706e82	176	/* hwaccel - with preallocated room for IV */
c801242c	177	ieee80211_tkip_add_iv(pos, key, key->u.tkip.tx.iv16);
f0706e82	178
e039fa4a	179	info->control.hw_key = &tx->key->conf;
f0706e82 JB	180	return 0;
	181	}
	182
	183	/* Add room for ICV */
	184	skb_put(skb, TKIP_ICV_LEN);
	185
	186	hdr = (struct ieee80211_hdr *) skb->data;
	187	ieee80211_tkip_encrypt_data(tx->local->wep_tx_tfm,
	188	key, pos, len, hdr->addr2);
	189	return 0;
	190	}
	191
	192
9ae54c84	193	ieee80211_tx_result
5cf121c3	194	ieee80211_crypto_tkip_encrypt(struct ieee80211_tx_data *tx)
f0706e82	195	{
f0706e82	196	struct sk_buff *skb = tx->skb;
c6a1fa12	197	int i;
f0706e82	198
5cf121c3	199	ieee80211_tx_set_protected(tx);
f0706e82	200
e039fa4a	201	if (tkip_encrypt_skb(tx, skb) < 0)
9ae54c84	202	return TX_DROP;
f0706e82	203
5cf121c3	204	if (tx->extra_frag) {
5cf121c3	205	for (i = 0; i < tx->num_extra_frag; i++) {
c6a1fa12	206	if (tkip_encrypt_skb(tx, tx->extra_frag[i]))
9ae54c84	207	return TX_DROP;
f0706e82 JB	208	}
	209	}
	210
9ae54c84	211	return TX_CONTINUE;
f0706e82 JB	212	}
	213
	214
9ae54c84	215	ieee80211_rx_result
5cf121c3	216	ieee80211_crypto_tkip_decrypt(struct ieee80211_rx_data *rx)
f0706e82 JB	217	{
f0706e82 JB	218	struct ieee80211_hdr hdr = (struct ieee80211_hdr ) rx->skb->data;
f0706e82 JB	219	int hdrlen, res, hwaccel = 0, wpa_test = 0;
	220	struct ieee80211_key *key = rx->key;
	221	struct sk_buff *skb = rx->skb;
	222
d5184cac	223	hdrlen = ieee80211_hdrlen(hdr->frame_control);
f0706e82	224
c34498b9	225	if (!ieee80211_is_data(hdr->frame_control))
9ae54c84	226	return RX_CONTINUE;
f0706e82 JB	227
f0706e82 JB	228	if (!rx->sta \|\| skb->len - hdrlen < 12)
e4c26add	229	return RX_DROP_UNUSABLE;
f0706e82	230
5cf121c3 JB	231	if (rx->status->flag & RX_FLAG_DECRYPTED) {
5cf121c3 JB	232	if (rx->status->flag & RX_FLAG_IV_STRIPPED) {
7848ba7d JB	233	/*
	234	* Hardware took care of all processing, including
	235	* replay protection, and stripped the ICV/IV so
	236	* we cannot do any checks here.
	237	*/
9ae54c84	238	return RX_CONTINUE;
f0706e82 JB	239	}
	240
	241	/* let TKIP code verify IV, but skip decryption */
	242	hwaccel = 1;
	243	}
	244
	245	res = ieee80211_tkip_decrypt_data(rx->local->wep_rx_tfm,
	246	key, skb->data + hdrlen,
17741cdc	247	skb->len - hdrlen, rx->sta->sta.addr,
9ae4fda3	248	hdr->addr1, hwaccel, rx->queue,
5cf121c3 JB	249	&rx->tkip_iv32,
5cf121c3 JB	250	&rx->tkip_iv16);
f4ea83dd	251	if (res != TKIP_DECRYPT_OK \|\| wpa_test)
e4c26add	252	return RX_DROP_UNUSABLE;
f0706e82 JB	253
	254	/* Trim ICV */
	255	skb_trim(skb, skb->len - TKIP_ICV_LEN);
	256
	257	/* Remove IV */
	258	memmove(skb->data + TKIP_IV_LEN, skb->data, hdrlen);
	259	skb_pull(skb, TKIP_IV_LEN);
	260
9ae54c84	261	return RX_CONTINUE;
f0706e82 JB	262	}
	263
	264
feccb466	265	static void ccmp_special_blocks(struct sk_buff skb, u8 pn, u8 *scratch,
f0706e82 JB	266	int encrypted)
f0706e82 JB	267	{
f14df804 HH	268	__le16 mask_fc;
	269	int a4_included;
	270	u8 qos_tid;
feccb466	271	u8 b_0, aad;
f14df804 HH	272	u16 data_len, len_a;
	273	unsigned int hdrlen;
	274	struct ieee80211_hdr hdr = (struct ieee80211_hdr )skb->data;
f0706e82	275
feccb466 HH	276	b_0 = scratch + 3 * AES_BLOCK_LEN;
	277	aad = scratch + 4 * AES_BLOCK_LEN;
	278
f14df804 HH	279	/*
	280	* Mask FC: zero subtype b4 b5 b6
	281	* Retry, PwrMgt, MoreData; set Protected
	282	*/
	283	mask_fc = hdr->frame_control;
	284	mask_fc &= ~cpu_to_le16(0x0070 \| IEEE80211_FCTL_RETRY \|
	285	IEEE80211_FCTL_PM \| IEEE80211_FCTL_MOREDATA);
	286	mask_fc \|= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
	287
	288	hdrlen = ieee80211_hdrlen(hdr->frame_control);
	289	len_a = hdrlen - 2;
	290	a4_included = ieee80211_has_a4(hdr->frame_control);
f0706e82	291
f14df804 HH	292	if (ieee80211_is_data_qos(hdr->frame_control))
	293	qos_tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
	294	else
	295	qos_tid = 0;
	296
	297	data_len = skb->len - hdrlen - CCMP_HDR_LEN;
	298	if (encrypted)
	299	data_len -= CCMP_MIC_LEN;
	300
	301	/* First block, b_0 */
f0706e82 JB	302	b_0[0] = 0x59; /* flags: Adata: 1, M: 011, L: 001 */
	303	/* Nonce: QoS Priority \| A2 \| PN */
	304	b_0[1] = qos_tid;
73e1f7c8	305	memcpy(&b_0[2], hdr->addr2, ETH_ALEN);
f0706e82 JB	306	memcpy(&b_0[8], pn, CCMP_PN_LEN);
f0706e82 JB	307	/* l(m) */
f14df804	308	put_unaligned_be16(data_len, &b_0[14]);
f0706e82 JB	309
	310	/* AAD (extra authenticate-only data) / masked 802.11 header
	311	* FC \| A1 \| A2 \| A3 \| SC \| [A4] \| [QC] */
f14df804 HH	312	put_unaligned_be16(len_a, &aad[0]);
f14df804 HH	313	put_unaligned(mask_fc, (__le16 *)&aad[2]);
73e1f7c8	314	memcpy(&aad[4], &hdr->addr1, 3 * ETH_ALEN);
f0706e82 JB	315
	316	/* Mask Seq#, leave Frag# */
	317	aad[22] = ((u8 ) &hdr->seq_ctrl) & 0x0f;
	318	aad[23] = 0;
f14df804	319
f0706e82	320	if (a4_included) {
73e1f7c8	321	memcpy(&aad[24], hdr->addr4, ETH_ALEN);
f14df804	322	aad[30] = qos_tid;
f0706e82	323	aad[31] = 0;
f14df804	324	} else {
73e1f7c8	325	memset(&aad[24], 0, ETH_ALEN + IEEE80211_QOS_CTL_LEN);
f14df804	326	aad[24] = qos_tid;
f0706e82 JB	327	}
	328	}
	329
	330
	331	static inline void ccmp_pn2hdr(u8 hdr, u8 pn, int key_id)
	332	{
	333	hdr[0] = pn[5];
	334	hdr[1] = pn[4];
	335	hdr[2] = 0;
	336	hdr[3] = 0x20 \| (key_id << 6);
	337	hdr[4] = pn[3];
	338	hdr[5] = pn[2];
	339	hdr[6] = pn[1];
	340	hdr[7] = pn[0];
	341	}
	342
	343
c6a1fa12	344	static inline void ccmp_hdr2pn(u8 pn, u8 hdr)
f0706e82 JB	345	{
	346	pn[0] = hdr[7];
	347	pn[1] = hdr[6];
	348	pn[2] = hdr[5];
	349	pn[3] = hdr[4];
	350	pn[4] = hdr[1];
	351	pn[5] = hdr[0];
f0706e82 JB	352	}
	353
	354
e039fa4a	355	static int ccmp_encrypt_skb(struct ieee80211_tx_data tx, struct sk_buff skb)
f0706e82 JB	356	{
	357	struct ieee80211_hdr hdr = (struct ieee80211_hdr ) skb->data;
	358	struct ieee80211_key *key = tx->key;
e039fa4a	359	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
23c0752a	360	int hdrlen, len, tail;
feccb466	361	u8 pos, pn;
f0706e82 JB	362	int i;
f0706e82 JB	363
e039fa4a JB	364	if ((tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) &&
e039fa4a JB	365	!(tx->key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV)) {
c6a1fa12	366	/* hwaccel - with no need for preallocated room for CCMP
e039fa4a JB	367	* header or MIC fields */
e039fa4a JB	368	info->control.hw_key = &tx->key->conf;
23c0752a	369	return 0;
e039fa4a JB	370	}
e039fa4a JB	371
d5184cac	372	hdrlen = ieee80211_hdrlen(hdr->frame_control);
f0706e82 JB	373	len = skb->len - hdrlen;
f0706e82 JB	374
11a843b7	375	if (key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)
23c0752a	376	tail = 0;
11a843b7	377	else
23c0752a JB	378	tail = CCMP_MIC_LEN;
	379
	380	if (WARN_ON(skb_tailroom(skb) < tail \|\|
	381	skb_headroom(skb) < CCMP_HDR_LEN))
	382	return -1;
f0706e82 JB	383
	384	pos = skb_push(skb, CCMP_HDR_LEN);
	385	memmove(pos, pos + CCMP_HDR_LEN, hdrlen);
	386	hdr = (struct ieee80211_hdr *) pos;
	387	pos += hdrlen;
	388
	389	/* PN = PN + 1 */
	390	pn = key->u.ccmp.tx_pn;
	391
	392	for (i = CCMP_PN_LEN - 1; i >= 0; i--) {
	393	pn[i]++;
	394	if (pn[i])
	395	break;
	396	}
	397
8f20fc24	398	ccmp_pn2hdr(pos, pn, key->conf.keyidx);
f0706e82	399
11a843b7	400	if (key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) {
f0706e82	401	/* hwaccel - with preallocated room for CCMP header */
e039fa4a	402	info->control.hw_key = &tx->key->conf;
f0706e82 JB	403	return 0;
	404	}
	405
	406	pos += CCMP_HDR_LEN;
feccb466 HH	407	ccmp_special_blocks(skb, pn, key->u.ccmp.tx_crypto_buf, 0);
feccb466 HH	408	ieee80211_aes_ccm_encrypt(key->u.ccmp.tfm, key->u.ccmp.tx_crypto_buf, pos, len,
f0706e82 JB	409	pos, skb_put(skb, CCMP_MIC_LEN));
	410
	411	return 0;
	412	}
	413
	414
9ae54c84	415	ieee80211_tx_result
5cf121c3	416	ieee80211_crypto_ccmp_encrypt(struct ieee80211_tx_data *tx)
f0706e82	417	{
f0706e82	418	struct sk_buff *skb = tx->skb;
c6a1fa12	419	int i;
f0706e82	420
5cf121c3	421	ieee80211_tx_set_protected(tx);
f0706e82	422
e039fa4a	423	if (ccmp_encrypt_skb(tx, skb) < 0)
9ae54c84	424	return TX_DROP;
f0706e82	425
5cf121c3	426	if (tx->extra_frag) {
5cf121c3	427	for (i = 0; i < tx->num_extra_frag; i++) {
c6a1fa12	428	if (ccmp_encrypt_skb(tx, tx->extra_frag[i]))
9ae54c84	429	return TX_DROP;
f0706e82 JB	430	}
	431	}
	432
9ae54c84	433	return TX_CONTINUE;
f0706e82 JB	434	}
	435
	436
9ae54c84	437	ieee80211_rx_result
5cf121c3	438	ieee80211_crypto_ccmp_decrypt(struct ieee80211_rx_data *rx)
f0706e82	439	{
c34498b9	440	struct ieee80211_hdr hdr = (struct ieee80211_hdr )rx->skb->data;
f0706e82 JB	441	int hdrlen;
	442	struct ieee80211_key *key = rx->key;
	443	struct sk_buff *skb = rx->skb;
	444	u8 pn[CCMP_PN_LEN];
	445	int data_len;
	446
d5184cac	447	hdrlen = ieee80211_hdrlen(hdr->frame_control);
f0706e82	448
c34498b9	449	if (!ieee80211_is_data(hdr->frame_control))
9ae54c84	450	return RX_CONTINUE;
f0706e82 JB	451
	452	data_len = skb->len - hdrlen - CCMP_HDR_LEN - CCMP_MIC_LEN;
	453	if (!rx->sta \|\| data_len < 0)
e4c26add	454	return RX_DROP_UNUSABLE;
f0706e82	455
5cf121c3 JB	456	if ((rx->status->flag & RX_FLAG_DECRYPTED) &&
5cf121c3 JB	457	(rx->status->flag & RX_FLAG_IV_STRIPPED))
9ae54c84	458	return RX_CONTINUE;
f0706e82	459
c6a1fa12	460	ccmp_hdr2pn(pn, skb->data + hdrlen);
f0706e82	461
5cf121c3	462	if (memcmp(pn, key->u.ccmp.rx_pn[rx->queue], CCMP_PN_LEN) <= 0) {
f0706e82	463	key->u.ccmp.replays++;
e4c26add	464	return RX_DROP_UNUSABLE;
f0706e82 JB	465	}
f0706e82 JB	466
5cf121c3	467	if (!(rx->status->flag & RX_FLAG_DECRYPTED)) {
7848ba7d	468	/* hardware didn't decrypt/verify MIC */
feccb466	469	ccmp_special_blocks(skb, pn, key->u.ccmp.rx_crypto_buf, 1);
f0706e82 JB	470
f0706e82 JB	471	if (ieee80211_aes_ccm_decrypt(
feccb466	472	key->u.ccmp.tfm, key->u.ccmp.rx_crypto_buf,
f0706e82 JB	473	skb->data + hdrlen + CCMP_HDR_LEN, data_len,
f0706e82 JB	474	skb->data + skb->len - CCMP_MIC_LEN,
c6a1fa12	475	skb->data + hdrlen + CCMP_HDR_LEN))
e4c26add	476	return RX_DROP_UNUSABLE;
f0706e82 JB	477	}
f0706e82 JB	478
5cf121c3	479	memcpy(key->u.ccmp.rx_pn[rx->queue], pn, CCMP_PN_LEN);
f0706e82 JB	480
	481	/* Remove CCMP header and MIC */
	482	skb_trim(skb, skb->len - CCMP_MIC_LEN);
	483	memmove(skb->data + CCMP_HDR_LEN, skb->data, hdrlen);
	484	skb_pull(skb, CCMP_HDR_LEN);
	485
9ae54c84	486	return RX_CONTINUE;
f0706e82	487	}