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

/*
 * Copyright 2002-2004, Instant802 Networks, Inc.
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <linux/netdevice.h>
#include <linux/types.h>
#include <linux/slab.h>
#include <linux/skbuff.h>
#include <linux/compiler.h>
#include <net/mac80211.h>

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

static int ieee80211_get_hdr_info(const struct sk_buff *skb, u8 **sa, u8 **da,
				  u8 *qos_tid, u8 **data, size_t *data_len)
{
	struct ieee80211_hdr *hdr;
	size_t hdrlen;
	__le16 fc;

	hdr = (struct ieee80211_hdr *)skb->data;
	fc = hdr->frame_control;

	hdrlen = ieee80211_hdrlen(fc);

	*sa = ieee80211_get_SA(hdr);
	*da = ieee80211_get_DA(hdr);

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

	if (ieee80211_is_data_qos(fc))
		*qos_tid = (*ieee80211_get_qos_ctl(hdr) & 0x0f) | 0x80;
	else
		*qos_tid = 0;

	return skb->len < hdrlen ? -1 : 0;
}


ieee80211_tx_result
ieee80211_tx_h_michael_mic_add(struct ieee80211_tx_data *tx)
{
	u8 *data, *sa, *da, *key, *mic, qos_tid;
	size_t data_len;
	u16 fc;
	struct sk_buff *skb = tx->skb;
	int authenticator;
	int wpa_test = 0;
	int tail;

	fc = tx->fc;

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

	if (ieee80211_get_hdr_info(skb, &sa, &da, &qos_tid, &data, &data_len))
		return TX_DROP;

	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
	key = &tx->key->conf.key[authenticator ? ALG_TKIP_TEMP_AUTH_TX_MIC_KEY :
				 ALG_TKIP_TEMP_AUTH_RX_MIC_KEY];
	mic = skb_put(skb, MICHAEL_MIC_LEN);
	michael_mic(key, da, sa, qos_tid & 0x0f, data, data_len, mic);

	return TX_CONTINUE;
}


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

	fc = rx->fc;

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

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

	if (ieee80211_get_hdr_info(skb, &sa, &da, &qos_tid, &data, &data_len)
	    || data_len < MICHAEL_MIC_LEN)
		return RX_DROP_UNUSABLE;

	data_len -= MICHAEL_MIC_LEN;

#if 0
	authenticator = fc & IEEE80211_FCTL_TODS; /* FIX */
#else
	authenticator = 1;
#endif
	key = &rx->key->conf.key[authenticator ? ALG_TKIP_TEMP_AUTH_RX_MIC_KEY :
				 ALG_TKIP_TEMP_AUTH_TX_MIC_KEY];
	michael_mic(key, da, sa, qos_tid & 0x0f, 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;

		printk(KERN_DEBUG "%s: invalid Michael MIC in data frame from "
		       "%s\n", rx->dev->name, print_mac(mac, sa));

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

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

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

	return RX_CONTINUE;
}


static int tkip_encrypt_skb(struct ieee80211_tx_data *tx, struct sk_buff *skb)
{
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
	struct ieee80211_key *key = tx->key;
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
	unsigned int hdrlen;
	int len, tail;
	u8 *pos;

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

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

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

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

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

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

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

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

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

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

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


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

	ieee80211_tx_set_protected(tx);

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

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

	return TX_CONTINUE;
}


ieee80211_rx_result
ieee80211_crypto_tkip_decrypt(struct ieee80211_rx_data *rx)
{
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data;
	int hdrlen, res, hwaccel = 0, wpa_test = 0;
	struct ieee80211_key *key = rx->key;
	struct sk_buff *skb = rx->skb;
	DECLARE_MAC_BUF(mac);

	hdrlen = ieee80211_hdrlen(hdr->frame_control);

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

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

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

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

	res = ieee80211_tkip_decrypt_data(rx->local->wep_rx_tfm,
					  key, skb->data + hdrlen,
					  skb->len - hdrlen, rx->sta->addr,
					  hdr->addr1, hwaccel, rx->queue,
					  &rx->tkip_iv32,
					  &rx->tkip_iv16);
	if (res != TKIP_DECRYPT_OK || wpa_test) {
#ifdef CONFIG_MAC80211_DEBUG
		if (net_ratelimit())
			printk(KERN_DEBUG "%s: TKIP decrypt failed for RX "
			       "frame from %s (res=%d)\n", rx->dev->name,
			       print_mac(mac, rx->sta->addr), res);
#endif /* CONFIG_MAC80211_DEBUG */
		return RX_DROP_UNUSABLE;
	}

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

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

	return RX_CONTINUE;
}


static void ccmp_special_blocks(struct sk_buff *skb, u8 *pn, u8 *b_0, u8 *aad,
				int encrypted)
{
	u16 fc;
	int a4_included, qos_included;
	u8 qos_tid, *fc_pos, *data, *sa, *da;
	int len_a;
	size_t data_len;
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;

	fc_pos = (u8 *) &hdr->frame_control;
	fc = fc_pos[0] ^ (fc_pos[1] << 8);
	a4_included = (fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) ==
		(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS);

	ieee80211_get_hdr_info(skb, &sa, &da, &qos_tid, &data, &data_len);
	data_len -= CCMP_HDR_LEN + (encrypted ? CCMP_MIC_LEN : 0);
	if (qos_tid & 0x80) {
		qos_included = 1;
		qos_tid &= 0x0f;
	} else
		qos_included = 0;
	/* 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, 6);
	memcpy(&b_0[8], pn, CCMP_PN_LEN);
	/* l(m) */
	b_0[14] = (data_len >> 8) & 0xff;
	b_0[15] = data_len & 0xff;


	/* AAD (extra authenticate-only data) / masked 802.11 header
	 * FC | A1 | A2 | A3 | SC | [A4] | [QC] */

	len_a = a4_included ? 28 : 22;
	if (qos_included)
		len_a += 2;

	aad[0] = 0; /* (len_a >> 8) & 0xff; */
	aad[1] = len_a & 0xff;
	/* Mask FC: zero subtype b4 b5 b6 */
	aad[2] = fc_pos[0] & ~(BIT(4) | BIT(5) | BIT(6));
	/* Retry, PwrMgt, MoreData; set Protected */
	aad[3] = (fc_pos[1] & ~(BIT(3) | BIT(4) | BIT(5))) | BIT(6);
	memcpy(&aad[4], &hdr->addr1, 18);

	/* Mask Seq#, leave Frag# */
	aad[22] = *((u8 *) &hdr->seq_ctrl) & 0x0f;
	aad[23] = 0;
	if (a4_included) {
		memcpy(&aad[24], hdr->addr4, 6);
		aad[30] = 0;
		aad[31] = 0;
	} else
		memset(&aad[24], 0, 8);
	if (qos_included) {
		u8 *dpos = &aad[a4_included ? 30 : 24];

		/* Mask QoS Control field */
		dpos[0] = qos_tid;
		dpos[1] = 0;
	}
}


static inline void ccmp_pn2hdr(u8 *hdr, u8 *pn, int key_id)
{
	hdr[0] = pn[5];
	hdr[1] = pn[4];
	hdr[2] = 0;
	hdr[3] = 0x20 | (key_id << 6);
	hdr[4] = pn[3];
	hdr[5] = pn[2];
	hdr[6] = pn[1];
	hdr[7] = pn[0];
}


static inline int ccmp_hdr2pn(u8 *pn, u8 *hdr)
{
	pn[0] = hdr[7];
	pn[1] = hdr[6];
	pn[2] = hdr[5];
	pn[3] = hdr[4];
	pn[4] = hdr[1];
	pn[5] = hdr[0];
	return (hdr[3] >> 6) & 0x03;
}


static int ccmp_encrypt_skb(struct ieee80211_tx_data *tx, struct sk_buff *skb)
{
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
	struct ieee80211_key *key = tx->key;
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
	int hdrlen, len, tail;
	u8 *pos, *pn, *b_0, *aad, *scratch;
	int i;

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

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

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

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

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

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

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

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

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

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

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

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

	return 0;
}


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

	ieee80211_tx_set_protected(tx);

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

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

	return TX_CONTINUE;
}


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

	hdrlen = ieee80211_hdrlen(hdr->frame_control);

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

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

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

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

	if (memcmp(pn, key->u.ccmp.rx_pn[rx->queue], CCMP_PN_LEN) <= 0) {
#ifdef CONFIG_MAC80211_DEBUG
		u8 *ppn = key->u.ccmp.rx_pn[rx->queue];

		printk(KERN_DEBUG "%s: CCMP replay detected for RX frame from "
		       "%s (RX PN %02x%02x%02x%02x%02x%02x <= prev. PN "
		       "%02x%02x%02x%02x%02x%02x)\n", rx->dev->name,
		       print_mac(mac, rx->sta->addr),
		       pn[0], pn[1], pn[2], pn[3], pn[4], pn[5],
		       ppn[0], ppn[1], ppn[2], ppn[3], ppn[4], ppn[5]);
#endif /* CONFIG_MAC80211_DEBUG */
		key->u.ccmp.replays++;
		return RX_DROP_UNUSABLE;
	}

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

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

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

		if (ieee80211_aes_ccm_decrypt(
			    key->u.ccmp.tfm, scratch, b_0, aad,
			    skb->data + hdrlen + CCMP_HDR_LEN, data_len,
			    skb->data + skb->len - CCMP_MIC_LEN,
			    skb->data + hdrlen + CCMP_HDR_LEN)) {
#ifdef CONFIG_MAC80211_DEBUG
			if (net_ratelimit())
				printk(KERN_DEBUG "%s: CCMP decrypt failed "
				       "for RX frame from %s\n", rx->dev->name,
				       print_mac(mac, rx->sta->addr));
#endif /* CONFIG_MAC80211_DEBUG */
			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>
f0706e82	14	#include <net/mac80211.h>
eb063c17	15
f0706e82 JB	16	#include "ieee80211_i.h"
	17	#include "michael.h"
	18	#include "tkip.h"
	19	#include "aes_ccm.h"
	20	#include "wpa.h"
	21
	22	static int ieee80211_get_hdr_info(const struct sk_buff skb, u8 sa, u8 *da,
	23	u8 qos_tid, u8 data, size_t data_len)
	24	{
	25	struct ieee80211_hdr *hdr;
	26	size_t hdrlen;
d5184cac	27	__le16 fc;
f0706e82	28
d5184cac HH	29	hdr = (struct ieee80211_hdr *)skb->data;
d5184cac HH	30	fc = hdr->frame_control;
f0706e82	31
d5184cac HH	32	hdrlen = ieee80211_hdrlen(fc);
	33
	34	*sa = ieee80211_get_SA(hdr);
	35	*da = ieee80211_get_DA(hdr);
f0706e82 JB	36
	37	*data = skb->data + hdrlen;
	38	*data_len = skb->len - hdrlen;
	39
d5184cac HH	40	if (ieee80211_is_data_qos(fc))
	41	qos_tid = (ieee80211_get_qos_ctl(hdr) & 0x0f) \| 0x80;
	42	else
f0706e82 JB	43	*qos_tid = 0;
	44
	45	return skb->len < hdrlen ? -1 : 0;
	46	}
	47
	48
9ae54c84	49	ieee80211_tx_result
5cf121c3	50	ieee80211_tx_h_michael_mic_add(struct ieee80211_tx_data *tx)
f0706e82 JB	51	{
	52	u8 data, sa, da, key, *mic, qos_tid;
	53	size_t data_len;
	54	u16 fc;
	55	struct sk_buff *skb = tx->skb;
	56	int authenticator;
	57	int wpa_test = 0;
23c0752a	58	int tail;
f0706e82 JB	59
	60	fc = tx->fc;
	61
8f20fc24	62	if (!tx->key \|\| tx->key->conf.alg != ALG_TKIP \|\| skb->len < 24 \|\|
f0706e82	63	!WLAN_FC_DATA_PRESENT(fc))
9ae54c84	64	return TX_CONTINUE;
f0706e82 JB	65
f0706e82 JB	66	if (ieee80211_get_hdr_info(skb, &sa, &da, &qos_tid, &data, &data_len))
9ae54c84	67	return TX_DROP;
f0706e82	68
11a843b7	69	if ((tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) &&
5cf121c3	70	!(tx->flags & IEEE80211_TX_FRAGMENTED) &&
7848ba7d	71	!(tx->key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC) &&
f0706e82 JB	72	!wpa_test) {
	73	/* hwaccel - with no need for preallocated room for Michael MIC
	74	*/
9ae54c84	75	return TX_CONTINUE;
f0706e82 JB	76	}
f0706e82 JB	77
23c0752a JB	78	tail = MICHAEL_MIC_LEN;
	79	if (!(tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
	80	tail += TKIP_ICV_LEN;
	81
	82	if (WARN_ON(skb_tailroom(skb) < tail \|\|
	83	skb_headroom(skb) < TKIP_IV_LEN))
	84	return TX_DROP;
f0706e82 JB	85
	86	#if 0
	87	authenticator = fc & IEEE80211_FCTL_FROMDS; /* FIX */
	88	#else
	89	authenticator = 1;
	90	#endif
8f20fc24 JB	91	key = &tx->key->conf.key[authenticator ? ALG_TKIP_TEMP_AUTH_TX_MIC_KEY :
8f20fc24 JB	92	ALG_TKIP_TEMP_AUTH_RX_MIC_KEY];
f0706e82 JB	93	mic = skb_put(skb, MICHAEL_MIC_LEN);
	94	michael_mic(key, da, sa, qos_tid & 0x0f, data, data_len, mic);
	95
9ae54c84	96	return TX_CONTINUE;
f0706e82 JB	97	}
	98
	99
9ae54c84	100	ieee80211_rx_result
5cf121c3	101	ieee80211_rx_h_michael_mic_verify(struct ieee80211_rx_data *rx)
f0706e82 JB	102	{
	103	u8 data, sa, da, key = NULL, qos_tid;
	104	size_t data_len;
	105	u16 fc;
	106	u8 mic[MICHAEL_MIC_LEN];
	107	struct sk_buff *skb = rx->skb;
	108	int authenticator = 1, wpa_test = 0;
0795af57	109	DECLARE_MAC_BUF(mac);
f0706e82 JB	110
	111	fc = rx->fc;
	112
3017b80b JB	113	/*
	114	* No way to verify the MIC if the hardware stripped it
	115	*/
5cf121c3	116	if (rx->status->flag & RX_FLAG_MMIC_STRIPPED)
9ae54c84	117	return RX_CONTINUE;
f0706e82	118
8f20fc24	119	if (!rx->key \|\| rx->key->conf.alg != ALG_TKIP \|\|
f0706e82	120	!(rx->fc & IEEE80211_FCTL_PROTECTED) \|\| !WLAN_FC_DATA_PRESENT(fc))
9ae54c84	121	return RX_CONTINUE;
f0706e82	122
f0706e82 JB	123	if (ieee80211_get_hdr_info(skb, &sa, &da, &qos_tid, &data, &data_len)
f0706e82 JB	124	\|\| data_len < MICHAEL_MIC_LEN)
e4c26add	125	return RX_DROP_UNUSABLE;
f0706e82 JB	126
	127	data_len -= MICHAEL_MIC_LEN;
	128
	129	#if 0
	130	authenticator = fc & IEEE80211_FCTL_TODS; /* FIX */
	131	#else
	132	authenticator = 1;
	133	#endif
8f20fc24 JB	134	key = &rx->key->conf.key[authenticator ? ALG_TKIP_TEMP_AUTH_RX_MIC_KEY :
8f20fc24 JB	135	ALG_TKIP_TEMP_AUTH_TX_MIC_KEY];
f0706e82 JB	136	michael_mic(key, da, sa, qos_tid & 0x0f, data, data_len, mic);
f0706e82 JB	137	if (memcmp(mic, data + data_len, MICHAEL_MIC_LEN) != 0 \|\| wpa_test) {
5cf121c3	138	if (!(rx->flags & IEEE80211_RX_RA_MATCH))
e4c26add	139	return RX_DROP_UNUSABLE;
f0706e82 JB	140
f0706e82 JB	141	printk(KERN_DEBUG "%s: invalid Michael MIC in data frame from "
0795af57	142	"%s\n", rx->dev->name, print_mac(mac, sa));
f0706e82	143
8f20fc24	144	mac80211_ev_michael_mic_failure(rx->dev, rx->key->conf.keyidx,
eb063c17	145	(void *) skb->data);
e4c26add	146	return RX_DROP_UNUSABLE;
f0706e82 JB	147	}
f0706e82 JB	148
f0706e82 JB	149	/* remove Michael MIC from payload */
	150	skb_trim(skb, skb->len - MICHAEL_MIC_LEN);
	151
50741ae0	152	/* update IV in key information to be able to detect replays */
b0f76b33 HH	153	rx->key->u.tkip.rx[rx->queue].iv32 = rx->tkip_iv32;
b0f76b33 HH	154	rx->key->u.tkip.rx[rx->queue].iv16 = rx->tkip_iv16;
50741ae0	155
9ae54c84	156	return RX_CONTINUE;
f0706e82 JB	157	}
	158
	159
e039fa4a	160	static int tkip_encrypt_skb(struct ieee80211_tx_data tx, struct sk_buff skb)
f0706e82 JB	161	{
	162	struct ieee80211_hdr hdr = (struct ieee80211_hdr ) skb->data;
	163	struct ieee80211_key *key = tx->key;
e039fa4a	164	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
d5184cac HH	165	unsigned int hdrlen;
d5184cac HH	166	int len, tail;
f0706e82 JB	167	u8 *pos;
f0706e82 JB	168
e039fa4a JB	169	info->control.icv_len = TKIP_ICV_LEN;
	170	info->control.iv_len = TKIP_IV_LEN;
	171
	172	if ((tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) &&
	173	!(tx->key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV)) {
	174	/* hwaccel - with no need for preallocated room for IV/ICV */
	175	info->control.hw_key = &tx->key->conf;
23c0752a	176	return 0;
e039fa4a JB	177	}
e039fa4a JB	178
d5184cac	179	hdrlen = ieee80211_hdrlen(hdr->frame_control);
f0706e82 JB	180	len = skb->len - hdrlen;
f0706e82 JB	181
11a843b7	182	if (tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)
23c0752a	183	tail = 0;
11a843b7	184	else
23c0752a JB	185	tail = TKIP_ICV_LEN;
	186
	187	if (WARN_ON(skb_tailroom(skb) < tail \|\|
	188	skb_headroom(skb) < TKIP_IV_LEN))
	189	return -1;
f0706e82 JB	190
	191	pos = skb_push(skb, TKIP_IV_LEN);
	192	memmove(pos, pos + TKIP_IV_LEN, hdrlen);
	193	pos += hdrlen;
	194
	195	/* Increase IV for the frame */
b0f76b33 HH	196	key->u.tkip.tx.iv16++;
	197	if (key->u.tkip.tx.iv16 == 0)
	198	key->u.tkip.tx.iv32++;
f0706e82	199
11a843b7	200	if (tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) {
f0706e82	201	/* hwaccel - with preallocated room for IV */
c801242c	202	ieee80211_tkip_add_iv(pos, key, key->u.tkip.tx.iv16);
f0706e82	203
e039fa4a	204	info->control.hw_key = &tx->key->conf;
f0706e82 JB	205	return 0;
	206	}
	207
	208	/* Add room for ICV */
	209	skb_put(skb, TKIP_ICV_LEN);
	210
	211	hdr = (struct ieee80211_hdr *) skb->data;
	212	ieee80211_tkip_encrypt_data(tx->local->wep_tx_tfm,
	213	key, pos, len, hdr->addr2);
	214	return 0;
	215	}
	216
	217
9ae54c84	218	ieee80211_tx_result
5cf121c3	219	ieee80211_crypto_tkip_encrypt(struct ieee80211_tx_data *tx)
f0706e82	220	{
f0706e82	221	struct sk_buff *skb = tx->skb;
f0706e82	222
5cf121c3	223	ieee80211_tx_set_protected(tx);
f0706e82	224
e039fa4a	225	if (tkip_encrypt_skb(tx, skb) < 0)
9ae54c84	226	return TX_DROP;
f0706e82	227
5cf121c3	228	if (tx->extra_frag) {
f0706e82	229	int i;
5cf121c3	230	for (i = 0; i < tx->num_extra_frag; i++) {
e039fa4a	231	if (tkip_encrypt_skb(tx, tx->extra_frag[i]) < 0)
9ae54c84	232	return TX_DROP;
f0706e82 JB	233	}
	234	}
	235
9ae54c84	236	return TX_CONTINUE;
f0706e82 JB	237	}
	238
	239
9ae54c84	240	ieee80211_rx_result
5cf121c3	241	ieee80211_crypto_tkip_decrypt(struct ieee80211_rx_data *rx)
f0706e82 JB	242	{
f0706e82 JB	243	struct ieee80211_hdr hdr = (struct ieee80211_hdr ) rx->skb->data;
f0706e82 JB	244	int hdrlen, res, hwaccel = 0, wpa_test = 0;
	245	struct ieee80211_key *key = rx->key;
	246	struct sk_buff *skb = rx->skb;
0795af57	247	DECLARE_MAC_BUF(mac);
f0706e82	248
d5184cac	249	hdrlen = ieee80211_hdrlen(hdr->frame_control);
f0706e82	250
4f0d18e2	251	if ((rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA)
9ae54c84	252	return RX_CONTINUE;
f0706e82 JB	253
f0706e82 JB	254	if (!rx->sta \|\| skb->len - hdrlen < 12)
e4c26add	255	return RX_DROP_UNUSABLE;
f0706e82	256
5cf121c3 JB	257	if (rx->status->flag & RX_FLAG_DECRYPTED) {
5cf121c3 JB	258	if (rx->status->flag & RX_FLAG_IV_STRIPPED) {
7848ba7d JB	259	/*
	260	* Hardware took care of all processing, including
	261	* replay protection, and stripped the ICV/IV so
	262	* we cannot do any checks here.
	263	*/
9ae54c84	264	return RX_CONTINUE;
f0706e82 JB	265	}
	266
	267	/* let TKIP code verify IV, but skip decryption */
	268	hwaccel = 1;
	269	}
	270
	271	res = ieee80211_tkip_decrypt_data(rx->local->wep_rx_tfm,
	272	key, skb->data + hdrlen,
	273	skb->len - hdrlen, rx->sta->addr,
9ae4fda3	274	hdr->addr1, hwaccel, rx->queue,
5cf121c3 JB	275	&rx->tkip_iv32,
5cf121c3 JB	276	&rx->tkip_iv16);
f0706e82	277	if (res != TKIP_DECRYPT_OK \|\| wpa_test) {
7f3ad894 JL	278	#ifdef CONFIG_MAC80211_DEBUG
	279	if (net_ratelimit())
	280	printk(KERN_DEBUG "%s: TKIP decrypt failed for RX "
	281	"frame from %s (res=%d)\n", rx->dev->name,
	282	print_mac(mac, rx->sta->addr), res);
	283	#endif /* CONFIG_MAC80211_DEBUG */
e4c26add	284	return RX_DROP_UNUSABLE;
f0706e82 JB	285	}
	286
	287	/* Trim ICV */
	288	skb_trim(skb, skb->len - TKIP_ICV_LEN);
	289
	290	/* Remove IV */
	291	memmove(skb->data + TKIP_IV_LEN, skb->data, hdrlen);
	292	skb_pull(skb, TKIP_IV_LEN);
	293
9ae54c84	294	return RX_CONTINUE;
f0706e82 JB	295	}
	296
	297
	298	static void ccmp_special_blocks(struct sk_buff skb, u8 pn, u8 b_0, u8 aad,
	299	int encrypted)
	300	{
	301	u16 fc;
	302	int a4_included, qos_included;
	303	u8 qos_tid, fc_pos, data, sa, da;
	304	int len_a;
	305	size_t data_len;
	306	struct ieee80211_hdr hdr = (struct ieee80211_hdr ) skb->data;
	307
	308	fc_pos = (u8 *) &hdr->frame_control;
	309	fc = fc_pos[0] ^ (fc_pos[1] << 8);
	310	a4_included = (fc & (IEEE80211_FCTL_TODS \| IEEE80211_FCTL_FROMDS)) ==
	311	(IEEE80211_FCTL_TODS \| IEEE80211_FCTL_FROMDS);
	312
	313	ieee80211_get_hdr_info(skb, &sa, &da, &qos_tid, &data, &data_len);
	314	data_len -= CCMP_HDR_LEN + (encrypted ? CCMP_MIC_LEN : 0);
	315	if (qos_tid & 0x80) {
	316	qos_included = 1;
	317	qos_tid &= 0x0f;
	318	} else
	319	qos_included = 0;
	320	/* First block, b_0 */
	321
	322	b_0[0] = 0x59; /* flags: Adata: 1, M: 011, L: 001 */
	323	/* Nonce: QoS Priority \| A2 \| PN */
	324	b_0[1] = qos_tid;
	325	memcpy(&b_0[2], hdr->addr2, 6);
	326	memcpy(&b_0[8], pn, CCMP_PN_LEN);
	327	/* l(m) */
	328	b_0[14] = (data_len >> 8) & 0xff;
	329	b_0[15] = data_len & 0xff;
	330
	331
	332	/* AAD (extra authenticate-only data) / masked 802.11 header
	333	* FC \| A1 \| A2 \| A3 \| SC \| [A4] \| [QC] */
	334
	335	len_a = a4_included ? 28 : 22;
	336	if (qos_included)
	337	len_a += 2;
	338
	339	aad[0] = 0; /* (len_a >> 8) & 0xff; */
	340	aad[1] = len_a & 0xff;
	341	/* Mask FC: zero subtype b4 b5 b6 */
	342	aad[2] = fc_pos[0] & ~(BIT(4) \| BIT(5) \| BIT(6));
	343	/* Retry, PwrMgt, MoreData; set Protected */
	344	aad[3] = (fc_pos[1] & ~(BIT(3) \| BIT(4) \| BIT(5))) \| BIT(6);
	345	memcpy(&aad[4], &hdr->addr1, 18);
	346
	347	/* Mask Seq#, leave Frag# */
	348	aad[22] = ((u8 ) &hdr->seq_ctrl) & 0x0f;
	349	aad[23] = 0;
	350	if (a4_included) {
	351	memcpy(&aad[24], hdr->addr4, 6);
	352	aad[30] = 0;
	353	aad[31] = 0;
	354	} else
	355	memset(&aad[24], 0, 8);
	356	if (qos_included) {
	357	u8 *dpos = &aad[a4_included ? 30 : 24];
	358
359	/* Mask QoS Control field */
360	dpos[0] = qos_tid;
361	dpos[1] = 0;
362	}
363	}
364
365
366	static inline void ccmp_pn2hdr(u8 hdr, u8 pn, int key_id)
367	{
368	hdr[0] = pn[5];
369	hdr[1] = pn[4];
370	hdr[2] = 0;
371	hdr[3] = 0x20 \| (key_id << 6);
372	hdr[4] = pn[3];
373	hdr[5] = pn[2];
374	hdr[6] = pn[1];
375	hdr[7] = pn[0];
376	}
377
378
379	static inline int ccmp_hdr2pn(u8 pn, u8 hdr)
380	{
381	pn[0] = hdr[7];
382	pn[1] = hdr[6];
383	pn[2] = hdr[5];
384	pn[3] = hdr[4];
385	pn[4] = hdr[1];
386	pn[5] = hdr[0];
387	return (hdr[3] >> 6) & 0x03;
388	}
389
390
e039fa4a	391	static int ccmp_encrypt_skb(struct ieee80211_tx_data tx, struct sk_buff skb)
f0706e82 JB	392	{
	393	struct ieee80211_hdr hdr = (struct ieee80211_hdr ) skb->data;
	394	struct ieee80211_key *key = tx->key;
e039fa4a	395	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
23c0752a	396	int hdrlen, len, tail;
f0706e82 JB	397	u8 pos, pn, b_0, aad, *scratch;
	398	int i;
	399
e039fa4a JB	400	info->control.icv_len = CCMP_MIC_LEN;
	401	info->control.iv_len = CCMP_HDR_LEN;
	402
	403	if ((tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) &&
	404	!(tx->key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV)) {
	405	/* hwaccel - with no need for preallocated room for CCMP "
	406	* header or MIC fields */
	407	info->control.hw_key = &tx->key->conf;
23c0752a	408	return 0;
e039fa4a JB	409	}
e039fa4a JB	410
f0706e82 JB	411	scratch = key->u.ccmp.tx_crypto_buf;
	412	b_0 = scratch + 3 * AES_BLOCK_LEN;
	413	aad = scratch + 4 * AES_BLOCK_LEN;
	414
d5184cac	415	hdrlen = ieee80211_hdrlen(hdr->frame_control);
f0706e82 JB	416	len = skb->len - hdrlen;
f0706e82 JB	417
11a843b7	418	if (key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)
23c0752a	419	tail = 0;
11a843b7	420	else
23c0752a JB	421	tail = CCMP_MIC_LEN;
	422
	423	if (WARN_ON(skb_tailroom(skb) < tail \|\|
	424	skb_headroom(skb) < CCMP_HDR_LEN))
	425	return -1;
f0706e82 JB	426
	427	pos = skb_push(skb, CCMP_HDR_LEN);
	428	memmove(pos, pos + CCMP_HDR_LEN, hdrlen);
	429	hdr = (struct ieee80211_hdr *) pos;
	430	pos += hdrlen;
	431
	432	/* PN = PN + 1 */
	433	pn = key->u.ccmp.tx_pn;
	434
	435	for (i = CCMP_PN_LEN - 1; i >= 0; i--) {
	436	pn[i]++;
	437	if (pn[i])
	438	break;
	439	}
	440
8f20fc24	441	ccmp_pn2hdr(pos, pn, key->conf.keyidx);
f0706e82	442
11a843b7	443	if (key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) {
f0706e82	444	/* hwaccel - with preallocated room for CCMP header */
e039fa4a	445	info->control.hw_key = &tx->key->conf;
f0706e82 JB	446	return 0;
	447	}
	448
	449	pos += CCMP_HDR_LEN;
	450	ccmp_special_blocks(skb, pn, b_0, aad, 0);
	451	ieee80211_aes_ccm_encrypt(key->u.ccmp.tfm, scratch, b_0, aad, pos, len,
	452	pos, skb_put(skb, CCMP_MIC_LEN));
	453
	454	return 0;
	455	}
	456
	457
9ae54c84	458	ieee80211_tx_result
5cf121c3	459	ieee80211_crypto_ccmp_encrypt(struct ieee80211_tx_data *tx)
f0706e82	460	{
f0706e82	461	struct sk_buff *skb = tx->skb;
f0706e82	462
5cf121c3	463	ieee80211_tx_set_protected(tx);
f0706e82	464
e039fa4a	465	if (ccmp_encrypt_skb(tx, skb) < 0)
9ae54c84	466	return TX_DROP;
f0706e82	467
5cf121c3	468	if (tx->extra_frag) {
f0706e82	469	int i;
5cf121c3	470	for (i = 0; i < tx->num_extra_frag; i++) {
e039fa4a	471	if (ccmp_encrypt_skb(tx, tx->extra_frag[i]) < 0)
9ae54c84	472	return TX_DROP;
f0706e82 JB	473	}
	474	}
	475
9ae54c84	476	return TX_CONTINUE;
f0706e82 JB	477	}
	478
	479
9ae54c84	480	ieee80211_rx_result
5cf121c3	481	ieee80211_crypto_ccmp_decrypt(struct ieee80211_rx_data *rx)
f0706e82 JB	482	{
f0706e82 JB	483	struct ieee80211_hdr hdr = (struct ieee80211_hdr ) rx->skb->data;
f0706e82 JB	484	int hdrlen;
	485	struct ieee80211_key *key = rx->key;
	486	struct sk_buff *skb = rx->skb;
	487	u8 pn[CCMP_PN_LEN];
	488	int data_len;
0795af57	489	DECLARE_MAC_BUF(mac);
f0706e82	490
d5184cac	491	hdrlen = ieee80211_hdrlen(hdr->frame_control);
f0706e82	492
4f0d18e2	493	if ((rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA)
9ae54c84	494	return RX_CONTINUE;
f0706e82 JB	495
	496	data_len = skb->len - hdrlen - CCMP_HDR_LEN - CCMP_MIC_LEN;
	497	if (!rx->sta \|\| data_len < 0)
e4c26add	498	return RX_DROP_UNUSABLE;
f0706e82	499
5cf121c3 JB	500	if ((rx->status->flag & RX_FLAG_DECRYPTED) &&
5cf121c3 JB	501	(rx->status->flag & RX_FLAG_IV_STRIPPED))
9ae54c84	502	return RX_CONTINUE;
f0706e82 JB	503
	504	(void) ccmp_hdr2pn(pn, skb->data + hdrlen);
	505
5cf121c3	506	if (memcmp(pn, key->u.ccmp.rx_pn[rx->queue], CCMP_PN_LEN) <= 0) {
f0706e82	507	#ifdef CONFIG_MAC80211_DEBUG
5cf121c3	508	u8 *ppn = key->u.ccmp.rx_pn[rx->queue];
0795af57	509
f0706e82	510	printk(KERN_DEBUG "%s: CCMP replay detected for RX frame from "
0795af57	511	"%s (RX PN %02x%02x%02x%02x%02x%02x <= prev. PN "
f0706e82	512	"%02x%02x%02x%02x%02x%02x)\n", rx->dev->name,
0795af57	513	print_mac(mac, rx->sta->addr),
f0706e82 JB	514	pn[0], pn[1], pn[2], pn[3], pn[4], pn[5],
	515	ppn[0], ppn[1], ppn[2], ppn[3], ppn[4], ppn[5]);
	516	#endif /* CONFIG_MAC80211_DEBUG */
	517	key->u.ccmp.replays++;
e4c26add	518	return RX_DROP_UNUSABLE;
f0706e82 JB	519	}
f0706e82 JB	520
5cf121c3	521	if (!(rx->status->flag & RX_FLAG_DECRYPTED)) {
7848ba7d	522	/* hardware didn't decrypt/verify MIC */
f0706e82 JB	523	u8 scratch, b_0, *aad;
	524
	525	scratch = key->u.ccmp.rx_crypto_buf;
	526	b_0 = scratch + 3 * AES_BLOCK_LEN;
	527	aad = scratch + 4 * AES_BLOCK_LEN;
	528
	529	ccmp_special_blocks(skb, pn, b_0, aad, 1);
	530
	531	if (ieee80211_aes_ccm_decrypt(
	532	key->u.ccmp.tfm, scratch, b_0, aad,
	533	skb->data + hdrlen + CCMP_HDR_LEN, data_len,
	534	skb->data + skb->len - CCMP_MIC_LEN,
	535	skb->data + hdrlen + CCMP_HDR_LEN)) {
7f3ad894 JL	536	#ifdef CONFIG_MAC80211_DEBUG
	537	if (net_ratelimit())
	538	printk(KERN_DEBUG "%s: CCMP decrypt failed "
	539	"for RX frame from %s\n", rx->dev->name,
	540	print_mac(mac, rx->sta->addr));
	541	#endif /* CONFIG_MAC80211_DEBUG */
e4c26add	542	return RX_DROP_UNUSABLE;
f0706e82 JB	543	}
	544	}
	545
5cf121c3	546	memcpy(key->u.ccmp.rx_pn[rx->queue], pn, CCMP_PN_LEN);
f0706e82 JB	547
	548	/* Remove CCMP header and MIC */
	549	skb_trim(skb, skb->len - CCMP_MIC_LEN);
	550	memmove(skb->data + CCMP_HDR_LEN, skb->data, hdrlen);
	551	skb_pull(skb, CCMP_HDR_LEN);
	552
9ae54c84	553	return RX_CONTINUE;
f0706e82	554	}