[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;
	u16 fc;
	int a4_included;
	u8 *pos;

	hdr = (struct ieee80211_hdr *) skb->data;
	fc = le16_to_cpu(hdr->frame_control);

	hdrlen = 24;
	if ((fc & (IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS)) ==
	    (IEEE80211_FCTL_FROMDS | IEEE80211_FCTL_TODS)) {
		hdrlen += ETH_ALEN;
		*sa = hdr->addr4;
		*da = hdr->addr3;
	} else if (fc & IEEE80211_FCTL_FROMDS) {
		*sa = hdr->addr3;
		*da = hdr->addr1;
	} else if (fc & IEEE80211_FCTL_TODS) {
		*sa = hdr->addr2;
		*da = hdr->addr3;
	} else {
		*sa = hdr->addr2;
		*da = hdr->addr1;
	}

	if (fc & 0x80)
		hdrlen += 2;

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

	a4_included = (fc & (IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS)) ==
		(IEEE80211_FCTL_TODS | IEEE80211_FCTL_FROMDS);
	if ((fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA &&
	    fc & IEEE80211_STYPE_QOS_DATA) {
		pos = (u8 *) &hdr->addr4;
		if (a4_included)
			pos += 6;
		*qos_tid = pos[0] & 0x0f;
		*qos_tid |= 0x80; /* qos_included flag */
	} else
		*qos_tid = 0;

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


ieee80211_tx_result
ieee80211_tx_h_michael_mic_add(struct ieee80211_txrx_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;

	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_TXRXD_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;
	}

	if (skb_tailroom(skb) < MICHAEL_MIC_LEN) {
		I802_DEBUG_INC(tx->local->tx_expand_skb_head);
		if (unlikely(pskb_expand_head(skb, TKIP_IV_LEN,
					      MICHAEL_MIC_LEN + TKIP_ICV_LEN,
					      GFP_ATOMIC))) {
			printk(KERN_DEBUG "%s: failed to allocate more memory "
			       "for Michael MIC\n", tx->dev->name);
			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_txrx_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->u.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;

	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_TXRXD_RXRA_MATCH))
			return RX_DROP;

		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;
	}

	/* 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.iv32_rx[rx->u.rx.queue] = rx->u.rx.tkip_iv32;
	rx->key->u.tkip.iv16_rx[rx->u.rx.queue] = rx->u.rx.tkip_iv16;

	return RX_CONTINUE;
}


static int tkip_encrypt_skb(struct ieee80211_txrx_data *tx,
			    struct sk_buff *skb, int test)
{
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
	struct ieee80211_key *key = tx->key;
	int hdrlen, len, tailneed;
	u16 fc;
	u8 *pos;

	fc = le16_to_cpu(hdr->frame_control);
	hdrlen = ieee80211_get_hdrlen(fc);
	len = skb->len - hdrlen;

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

	if ((skb_headroom(skb) < TKIP_IV_LEN ||
	     skb_tailroom(skb) < tailneed)) {
		I802_DEBUG_INC(tx->local->tx_expand_skb_head);
		if (unlikely(pskb_expand_head(skb, TKIP_IV_LEN, tailneed,
					      GFP_ATOMIC)))
			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.iv16++;
	if (key->u.tkip.iv16 == 0)
		key->u.tkip.iv32++;

	if (tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) {
		hdr = (struct ieee80211_hdr *)skb->data;

		/* hwaccel - with preallocated room for IV */
		ieee80211_tkip_add_iv(pos, key,
				      (u8) (key->u.tkip.iv16 >> 8),
				      (u8) (((key->u.tkip.iv16 >> 8) | 0x20) &
					    0x7f),
				      (u8) key->u.tkip.iv16);

		tx->u.tx.control->key_idx = tx->key->conf.hw_key_idx;
		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_txrx_data *tx)
{
	struct sk_buff *skb = tx->skb;
	int wpa_test = 0, test = 0;

	tx->u.tx.control->icv_len = TKIP_ICV_LEN;
	tx->u.tx.control->iv_len = TKIP_IV_LEN;
	ieee80211_tx_set_iswep(tx);

	if ((tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) &&
	    !(tx->key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV) &&
	    !wpa_test) {
		/* hwaccel - with no need for preallocated room for IV/ICV */
		tx->u.tx.control->key_idx = tx->key->conf.hw_key_idx;
		return TX_CONTINUE;
	}

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

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

	return TX_CONTINUE;
}


ieee80211_rx_result
ieee80211_crypto_tkip_decrypt(struct ieee80211_txrx_data *rx)
{
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data;
	u16 fc;
	int hdrlen, res, hwaccel = 0, wpa_test = 0;
	struct ieee80211_key *key = rx->key;
	struct sk_buff *skb = rx->skb;
	DECLARE_MAC_BUF(mac);

	fc = le16_to_cpu(hdr->frame_control);
	hdrlen = ieee80211_get_hdrlen(fc);

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

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

	if (rx->u.rx.status->flag & RX_FLAG_DECRYPTED) {
		if (rx->u.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,
					  hwaccel, rx->u.rx.queue,
					  &rx->u.rx.tkip_iv32,
					  &rx->u.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;
	}

	/* 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_txrx_data *tx,
			    struct sk_buff *skb, int test)
{
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;
	struct ieee80211_key *key = tx->key;
	int hdrlen, len, tailneed;
	u16 fc;
	u8 *pos, *pn, *b_0, *aad, *scratch;
	int i;

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

	fc = le16_to_cpu(hdr->frame_control);
	hdrlen = ieee80211_get_hdrlen(fc);
	len = skb->len - hdrlen;

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

	if ((skb_headroom(skb) < CCMP_HDR_LEN ||
	     skb_tailroom(skb) < tailneed)) {
		I802_DEBUG_INC(tx->local->tx_expand_skb_head);
		if (unlikely(pskb_expand_head(skb, CCMP_HDR_LEN, tailneed,
					      GFP_ATOMIC)))
			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 */
		tx->u.tx.control->key_idx = key->conf.hw_key_idx;
		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_txrx_data *tx)
{
	struct sk_buff *skb = tx->skb;
	int test = 0;

	tx->u.tx.control->icv_len = CCMP_MIC_LEN;
	tx->u.tx.control->iv_len = CCMP_HDR_LEN;
	ieee80211_tx_set_iswep(tx);

	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 */
		tx->u.tx.control->key_idx = tx->key->conf.hw_key_idx;
		return TX_CONTINUE;
	}

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

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

	return TX_CONTINUE;
}


ieee80211_rx_result
ieee80211_crypto_ccmp_decrypt(struct ieee80211_txrx_data *rx)
{
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data;
	u16 fc;
	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);

	fc = le16_to_cpu(hdr->frame_control);
	hdrlen = ieee80211_get_hdrlen(fc);

	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;

	if ((rx->u.rx.status->flag & RX_FLAG_DECRYPTED) &&
	    (rx->u.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->u.rx.queue], CCMP_PN_LEN) <= 0) {
#ifdef CONFIG_MAC80211_DEBUG
		u8 *ppn = key->u.ccmp.rx_pn[rx->u.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;
	}

	if (!(rx->u.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;
		}
	}

	memcpy(key->u.ccmp.rx_pn[rx->u.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;
	27	u16 fc;
	28	int a4_included;
	29	u8 *pos;
	30
	31	hdr = (struct ieee80211_hdr *) skb->data;
	32	fc = le16_to_cpu(hdr->frame_control);
	33
	34	hdrlen = 24;
	35	if ((fc & (IEEE80211_FCTL_FROMDS \| IEEE80211_FCTL_TODS)) ==
	36	(IEEE80211_FCTL_FROMDS \| IEEE80211_FCTL_TODS)) {
	37	hdrlen += ETH_ALEN;
	38	*sa = hdr->addr4;
	39	*da = hdr->addr3;
	40	} else if (fc & IEEE80211_FCTL_FROMDS) {
	41	*sa = hdr->addr3;
	42	*da = hdr->addr1;
	43	} else if (fc & IEEE80211_FCTL_TODS) {
	44	*sa = hdr->addr2;
	45	*da = hdr->addr3;
	46	} else {
	47	*sa = hdr->addr2;
	48	*da = hdr->addr1;
	49	}
	50
	51	if (fc & 0x80)
	52	hdrlen += 2;
	53
	54	*data = skb->data + hdrlen;
	55	*data_len = skb->len - hdrlen;
	56
	57	a4_included = (fc & (IEEE80211_FCTL_TODS \| IEEE80211_FCTL_FROMDS)) ==
	58	(IEEE80211_FCTL_TODS \| IEEE80211_FCTL_FROMDS);
	59	if ((fc & IEEE80211_FCTL_FTYPE) == IEEE80211_FTYPE_DATA &&
	60	fc & IEEE80211_STYPE_QOS_DATA) {
	61	pos = (u8 *) &hdr->addr4;
	62	if (a4_included)
	63	pos += 6;
	64	*qos_tid = pos[0] & 0x0f;
	65	qos_tid \|= 0x80; / qos_included flag */
	66	} else
	67	*qos_tid = 0;
	68
	69	return skb->len < hdrlen ? -1 : 0;
	70	}
	71
	72
9ae54c84	73	ieee80211_tx_result
f0706e82 JB	74	ieee80211_tx_h_michael_mic_add(struct ieee80211_txrx_data *tx)
	75	{
	76	u8 data, sa, da, key, *mic, qos_tid;
	77	size_t data_len;
	78	u16 fc;
	79	struct sk_buff *skb = tx->skb;
	80	int authenticator;
	81	int wpa_test = 0;
	82
	83	fc = tx->fc;
	84
8f20fc24	85	if (!tx->key \|\| tx->key->conf.alg != ALG_TKIP \|\| skb->len < 24 \|\|
f0706e82	86	!WLAN_FC_DATA_PRESENT(fc))
9ae54c84	87	return TX_CONTINUE;
f0706e82 JB	88
f0706e82 JB	89	if (ieee80211_get_hdr_info(skb, &sa, &da, &qos_tid, &data, &data_len))
9ae54c84	90	return TX_DROP;
f0706e82	91
11a843b7	92	if ((tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) &&
badffb72	93	!(tx->flags & IEEE80211_TXRXD_FRAGMENTED) &&
7848ba7d	94	!(tx->key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC) &&
f0706e82 JB	95	!wpa_test) {
	96	/* hwaccel - with no need for preallocated room for Michael MIC
	97	*/
9ae54c84	98	return TX_CONTINUE;
f0706e82 JB	99	}
	100
	101	if (skb_tailroom(skb) < MICHAEL_MIC_LEN) {
	102	I802_DEBUG_INC(tx->local->tx_expand_skb_head);
	103	if (unlikely(pskb_expand_head(skb, TKIP_IV_LEN,
	104	MICHAEL_MIC_LEN + TKIP_ICV_LEN,
	105	GFP_ATOMIC))) {
	106	printk(KERN_DEBUG "%s: failed to allocate more memory "
	107	"for Michael MIC\n", tx->dev->name);
9ae54c84	108	return TX_DROP;
f0706e82 JB	109	}
	110	}
	111
	112	#if 0
	113	authenticator = fc & IEEE80211_FCTL_FROMDS; /* FIX */
	114	#else
	115	authenticator = 1;
	116	#endif
8f20fc24 JB	117	key = &tx->key->conf.key[authenticator ? ALG_TKIP_TEMP_AUTH_TX_MIC_KEY :
8f20fc24 JB	118	ALG_TKIP_TEMP_AUTH_RX_MIC_KEY];
f0706e82 JB	119	mic = skb_put(skb, MICHAEL_MIC_LEN);
	120	michael_mic(key, da, sa, qos_tid & 0x0f, data, data_len, mic);
	121
9ae54c84	122	return TX_CONTINUE;
f0706e82 JB	123	}
	124
	125
9ae54c84	126	ieee80211_rx_result
f0706e82 JB	127	ieee80211_rx_h_michael_mic_verify(struct ieee80211_txrx_data *rx)
	128	{
	129	u8 data, sa, da, key = NULL, qos_tid;
	130	size_t data_len;
	131	u16 fc;
	132	u8 mic[MICHAEL_MIC_LEN];
	133	struct sk_buff *skb = rx->skb;
	134	int authenticator = 1, wpa_test = 0;
0795af57	135	DECLARE_MAC_BUF(mac);
f0706e82 JB	136
	137	fc = rx->fc;
	138
3017b80b JB	139	/*
	140	* No way to verify the MIC if the hardware stripped it
	141	*/
7848ba7d	142	if (rx->u.rx.status->flag & RX_FLAG_MMIC_STRIPPED)
9ae54c84	143	return RX_CONTINUE;
f0706e82	144
8f20fc24	145	if (!rx->key \|\| rx->key->conf.alg != ALG_TKIP \|\|
f0706e82	146	!(rx->fc & IEEE80211_FCTL_PROTECTED) \|\| !WLAN_FC_DATA_PRESENT(fc))
9ae54c84	147	return RX_CONTINUE;
f0706e82	148
f0706e82 JB	149	if (ieee80211_get_hdr_info(skb, &sa, &da, &qos_tid, &data, &data_len)
f0706e82 JB	150	\|\| data_len < MICHAEL_MIC_LEN)
9ae54c84	151	return RX_DROP;
f0706e82 JB	152
	153	data_len -= MICHAEL_MIC_LEN;
	154
	155	#if 0
	156	authenticator = fc & IEEE80211_FCTL_TODS; /* FIX */
	157	#else
	158	authenticator = 1;
	159	#endif
8f20fc24 JB	160	key = &rx->key->conf.key[authenticator ? ALG_TKIP_TEMP_AUTH_RX_MIC_KEY :
8f20fc24 JB	161	ALG_TKIP_TEMP_AUTH_TX_MIC_KEY];
f0706e82 JB	162	michael_mic(key, da, sa, qos_tid & 0x0f, data, data_len, mic);
f0706e82 JB	163	if (memcmp(mic, data + data_len, MICHAEL_MIC_LEN) != 0 \|\| wpa_test) {
badffb72	164	if (!(rx->flags & IEEE80211_TXRXD_RXRA_MATCH))
9ae54c84	165	return RX_DROP;
f0706e82 JB	166
f0706e82 JB	167	printk(KERN_DEBUG "%s: invalid Michael MIC in data frame from "
0795af57	168	"%s\n", rx->dev->name, print_mac(mac, sa));
f0706e82	169
8f20fc24	170	mac80211_ev_michael_mic_failure(rx->dev, rx->key->conf.keyidx,
eb063c17	171	(void *) skb->data);
9ae54c84	172	return RX_DROP;
f0706e82 JB	173	}
f0706e82 JB	174
f0706e82 JB	175	/* remove Michael MIC from payload */
	176	skb_trim(skb, skb->len - MICHAEL_MIC_LEN);
	177
50741ae0 JB	178	/* update IV in key information to be able to detect replays */
	179	rx->key->u.tkip.iv32_rx[rx->u.rx.queue] = rx->u.rx.tkip_iv32;
	180	rx->key->u.tkip.iv16_rx[rx->u.rx.queue] = rx->u.rx.tkip_iv16;
	181
9ae54c84	182	return RX_CONTINUE;
f0706e82 JB	183	}
	184
	185
	186	static int tkip_encrypt_skb(struct ieee80211_txrx_data *tx,
	187	struct sk_buff *skb, int test)
	188	{
	189	struct ieee80211_hdr hdr = (struct ieee80211_hdr ) skb->data;
	190	struct ieee80211_key *key = tx->key;
	191	int hdrlen, len, tailneed;
	192	u16 fc;
	193	u8 *pos;
	194
	195	fc = le16_to_cpu(hdr->frame_control);
	196	hdrlen = ieee80211_get_hdrlen(fc);
	197	len = skb->len - hdrlen;
	198
11a843b7	199	if (tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)
8f20fc24	200	tailneed = 0;
11a843b7 JB	201	else
11a843b7 JB	202	tailneed = TKIP_ICV_LEN;
8f20fc24	203
f0706e82 JB	204	if ((skb_headroom(skb) < TKIP_IV_LEN \|\|
	205	skb_tailroom(skb) < tailneed)) {
	206	I802_DEBUG_INC(tx->local->tx_expand_skb_head);
	207	if (unlikely(pskb_expand_head(skb, TKIP_IV_LEN, tailneed,
	208	GFP_ATOMIC)))
	209	return -1;
	210	}
	211
	212	pos = skb_push(skb, TKIP_IV_LEN);
	213	memmove(pos, pos + TKIP_IV_LEN, hdrlen);
	214	pos += hdrlen;
	215
	216	/* Increase IV for the frame */
	217	key->u.tkip.iv16++;
	218	if (key->u.tkip.iv16 == 0)
	219	key->u.tkip.iv32++;
	220
11a843b7	221	if (tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) {
f0706e82 JB	222	hdr = (struct ieee80211_hdr *)skb->data;
	223
	224	/* hwaccel - with preallocated room for IV */
	225	ieee80211_tkip_add_iv(pos, key,
	226	(u8) (key->u.tkip.iv16 >> 8),
	227	(u8) (((key->u.tkip.iv16 >> 8) \| 0x20) &
	228	0x7f),
	229	(u8) key->u.tkip.iv16);
	230
8f20fc24	231	tx->u.tx.control->key_idx = tx->key->conf.hw_key_idx;
f0706e82 JB	232	return 0;
	233	}
	234
	235	/* Add room for ICV */
	236	skb_put(skb, TKIP_ICV_LEN);
	237
	238	hdr = (struct ieee80211_hdr *) skb->data;
	239	ieee80211_tkip_encrypt_data(tx->local->wep_tx_tfm,
	240	key, pos, len, hdr->addr2);
	241	return 0;
	242	}
	243
	244
9ae54c84	245	ieee80211_tx_result
6a22a59d	246	ieee80211_crypto_tkip_encrypt(struct ieee80211_txrx_data *tx)
f0706e82	247	{
f0706e82 JB	248	struct sk_buff *skb = tx->skb;
	249	int wpa_test = 0, test = 0;
	250
f0706e82 JB	251	tx->u.tx.control->icv_len = TKIP_ICV_LEN;
	252	tx->u.tx.control->iv_len = TKIP_IV_LEN;
	253	ieee80211_tx_set_iswep(tx);
	254
11a843b7	255	if ((tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) &&
7848ba7d	256	!(tx->key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV) &&
f0706e82 JB	257	!wpa_test) {
f0706e82 JB	258	/* hwaccel - with no need for preallocated room for IV/ICV */
8f20fc24	259	tx->u.tx.control->key_idx = tx->key->conf.hw_key_idx;
9ae54c84	260	return TX_CONTINUE;
f0706e82 JB	261	}
	262
	263	if (tkip_encrypt_skb(tx, skb, test) < 0)
9ae54c84	264	return TX_DROP;
f0706e82 JB	265
	266	if (tx->u.tx.extra_frag) {
	267	int i;
	268	for (i = 0; i < tx->u.tx.num_extra_frag; i++) {
	269	if (tkip_encrypt_skb(tx, tx->u.tx.extra_frag[i], test)
	270	< 0)
9ae54c84	271	return TX_DROP;
f0706e82 JB	272	}
	273	}
	274
9ae54c84	275	return TX_CONTINUE;
f0706e82 JB	276	}
	277
	278
9ae54c84	279	ieee80211_rx_result
4f0d18e2	280	ieee80211_crypto_tkip_decrypt(struct ieee80211_txrx_data *rx)
f0706e82 JB	281	{
	282	struct ieee80211_hdr hdr = (struct ieee80211_hdr ) rx->skb->data;
	283	u16 fc;
	284	int hdrlen, res, hwaccel = 0, wpa_test = 0;
	285	struct ieee80211_key *key = rx->key;
	286	struct sk_buff *skb = rx->skb;
0795af57	287	DECLARE_MAC_BUF(mac);
f0706e82 JB	288
	289	fc = le16_to_cpu(hdr->frame_control);
	290	hdrlen = ieee80211_get_hdrlen(fc);
	291
4f0d18e2	292	if ((rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA)
9ae54c84	293	return RX_CONTINUE;
f0706e82 JB	294
f0706e82 JB	295	if (!rx->sta \|\| skb->len - hdrlen < 12)
9ae54c84	296	return RX_DROP;
f0706e82	297
7848ba7d JB	298	if (rx->u.rx.status->flag & RX_FLAG_DECRYPTED) {
	299	if (rx->u.rx.status->flag & RX_FLAG_IV_STRIPPED) {
	300	/*
	301	* Hardware took care of all processing, including
	302	* replay protection, and stripped the ICV/IV so
	303	* we cannot do any checks here.
	304	*/
9ae54c84	305	return RX_CONTINUE;
f0706e82 JB	306	}
	307
	308	/* let TKIP code verify IV, but skip decryption */
	309	hwaccel = 1;
	310	}
	311
	312	res = ieee80211_tkip_decrypt_data(rx->local->wep_rx_tfm,
	313	key, skb->data + hdrlen,
	314	skb->len - hdrlen, rx->sta->addr,
50741ae0 JB	315	hwaccel, rx->u.rx.queue,
	316	&rx->u.rx.tkip_iv32,
	317	&rx->u.rx.tkip_iv16);
f0706e82	318	if (res != TKIP_DECRYPT_OK \|\| wpa_test) {
7f3ad894 JL	319	#ifdef CONFIG_MAC80211_DEBUG
	320	if (net_ratelimit())
	321	printk(KERN_DEBUG "%s: TKIP decrypt failed for RX "
	322	"frame from %s (res=%d)\n", rx->dev->name,
	323	print_mac(mac, rx->sta->addr), res);
	324	#endif /* CONFIG_MAC80211_DEBUG */
9ae54c84	325	return RX_DROP;
f0706e82 JB	326	}
	327
	328	/* Trim ICV */
	329	skb_trim(skb, skb->len - TKIP_ICV_LEN);
	330
	331	/* Remove IV */
	332	memmove(skb->data + TKIP_IV_LEN, skb->data, hdrlen);
	333	skb_pull(skb, TKIP_IV_LEN);
	334
9ae54c84	335	return RX_CONTINUE;
f0706e82 JB	336	}
	337
	338
	339	static void ccmp_special_blocks(struct sk_buff skb, u8 pn, u8 b_0, u8 aad,
	340	int encrypted)
	341	{
	342	u16 fc;
	343	int a4_included, qos_included;
	344	u8 qos_tid, fc_pos, data, sa, da;
	345	int len_a;
	346	size_t data_len;
	347	struct ieee80211_hdr hdr = (struct ieee80211_hdr ) skb->data;
	348
	349	fc_pos = (u8 *) &hdr->frame_control;
	350	fc = fc_pos[0] ^ (fc_pos[1] << 8);
	351	a4_included = (fc & (IEEE80211_FCTL_TODS \| IEEE80211_FCTL_FROMDS)) ==
	352	(IEEE80211_FCTL_TODS \| IEEE80211_FCTL_FROMDS);
	353
	354	ieee80211_get_hdr_info(skb, &sa, &da, &qos_tid, &data, &data_len);
	355	data_len -= CCMP_HDR_LEN + (encrypted ? CCMP_MIC_LEN : 0);
	356	if (qos_tid & 0x80) {
	357	qos_included = 1;
	358	qos_tid &= 0x0f;
	359	} else
	360	qos_included = 0;
	361	/* First block, b_0 */
	362
	363	b_0[0] = 0x59; /* flags: Adata: 1, M: 011, L: 001 */
	364	/* Nonce: QoS Priority \| A2 \| PN */
	365	b_0[1] = qos_tid;
	366	memcpy(&b_0[2], hdr->addr2, 6);
	367	memcpy(&b_0[8], pn, CCMP_PN_LEN);
	368	/* l(m) */
	369	b_0[14] = (data_len >> 8) & 0xff;
	370	b_0[15] = data_len & 0xff;
	371
	372
	373	/* AAD (extra authenticate-only data) / masked 802.11 header
	374	* FC \| A1 \| A2 \| A3 \| SC \| [A4] \| [QC] */
	375
	376	len_a = a4_included ? 28 : 22;
	377	if (qos_included)
	378	len_a += 2;
	379
	380	aad[0] = 0; /* (len_a >> 8) & 0xff; */
	381	aad[1] = len_a & 0xff;
	382	/* Mask FC: zero subtype b4 b5 b6 */
	383	aad[2] = fc_pos[0] & ~(BIT(4) \| BIT(5) \| BIT(6));
	384	/* Retry, PwrMgt, MoreData; set Protected */
	385	aad[3] = (fc_pos[1] & ~(BIT(3) \| BIT(4) \| BIT(5))) \| BIT(6);
	386	memcpy(&aad[4], &hdr->addr1, 18);
	387
	388	/* Mask Seq#, leave Frag# */
	389	aad[22] = ((u8 ) &hdr->seq_ctrl) & 0x0f;
	390	aad[23] = 0;
	391	if (a4_included) {
	392	memcpy(&aad[24], hdr->addr4, 6);
	393	aad[30] = 0;
	394	aad[31] = 0;
	395	} else
	396	memset(&aad[24], 0, 8);
	397	if (qos_included) {
	398	u8 *dpos = &aad[a4_included ? 30 : 24];
	399
400	/* Mask QoS Control field */
401	dpos[0] = qos_tid;
402	dpos[1] = 0;
403	}
404	}
405
406
407	static inline void ccmp_pn2hdr(u8 hdr, u8 pn, int key_id)
408	{
409	hdr[0] = pn[5];
410	hdr[1] = pn[4];
411	hdr[2] = 0;
412	hdr[3] = 0x20 \| (key_id << 6);
413	hdr[4] = pn[3];
414	hdr[5] = pn[2];
415	hdr[6] = pn[1];
416	hdr[7] = pn[0];
417	}
418
419
420	static inline int ccmp_hdr2pn(u8 pn, u8 hdr)
421	{
422	pn[0] = hdr[7];
423	pn[1] = hdr[6];
424	pn[2] = hdr[5];
425	pn[3] = hdr[4];
426	pn[4] = hdr[1];
427	pn[5] = hdr[0];
428	return (hdr[3] >> 6) & 0x03;
429	}
430
431
432	static int ccmp_encrypt_skb(struct ieee80211_txrx_data *tx,
433	struct sk_buff *skb, int test)
434	{
435	struct ieee80211_hdr hdr = (struct ieee80211_hdr ) skb->data;
436	struct ieee80211_key *key = tx->key;
437	int hdrlen, len, tailneed;
438	u16 fc;
439	u8 pos, pn, b_0, aad, *scratch;
440	int i;
441
442	scratch = key->u.ccmp.tx_crypto_buf;
443	b_0 = scratch + 3 * AES_BLOCK_LEN;
444	aad = scratch + 4 * AES_BLOCK_LEN;
445
446	fc = le16_to_cpu(hdr->frame_control);
447	hdrlen = ieee80211_get_hdrlen(fc);
448	len = skb->len - hdrlen;
449
11a843b7	450	if (key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)
8f20fc24	451	tailneed = 0;
11a843b7 JB	452	else
11a843b7 JB	453	tailneed = CCMP_MIC_LEN;
f0706e82 JB	454
	455	if ((skb_headroom(skb) < CCMP_HDR_LEN \|\|
	456	skb_tailroom(skb) < tailneed)) {
	457	I802_DEBUG_INC(tx->local->tx_expand_skb_head);
	458	if (unlikely(pskb_expand_head(skb, CCMP_HDR_LEN, tailneed,
	459	GFP_ATOMIC)))
	460	return -1;
	461	}
	462
	463	pos = skb_push(skb, CCMP_HDR_LEN);
	464	memmove(pos, pos + CCMP_HDR_LEN, hdrlen);
	465	hdr = (struct ieee80211_hdr *) pos;
	466	pos += hdrlen;
	467
	468	/* PN = PN + 1 */
	469	pn = key->u.ccmp.tx_pn;
	470
	471	for (i = CCMP_PN_LEN - 1; i >= 0; i--) {
	472	pn[i]++;
	473	if (pn[i])
	474	break;
	475	}
	476
8f20fc24	477	ccmp_pn2hdr(pos, pn, key->conf.keyidx);
f0706e82	478
11a843b7	479	if (key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) {
f0706e82	480	/* hwaccel - with preallocated room for CCMP header */
8f20fc24	481	tx->u.tx.control->key_idx = key->conf.hw_key_idx;
f0706e82 JB	482	return 0;
	483	}
	484
	485	pos += CCMP_HDR_LEN;
	486	ccmp_special_blocks(skb, pn, b_0, aad, 0);
	487	ieee80211_aes_ccm_encrypt(key->u.ccmp.tfm, scratch, b_0, aad, pos, len,
	488	pos, skb_put(skb, CCMP_MIC_LEN));
	489
	490	return 0;
	491	}
	492
	493
9ae54c84	494	ieee80211_tx_result
6a22a59d	495	ieee80211_crypto_ccmp_encrypt(struct ieee80211_txrx_data *tx)
f0706e82	496	{
f0706e82 JB	497	struct sk_buff *skb = tx->skb;
	498	int test = 0;
	499
f0706e82 JB	500	tx->u.tx.control->icv_len = CCMP_MIC_LEN;
	501	tx->u.tx.control->iv_len = CCMP_HDR_LEN;
	502	ieee80211_tx_set_iswep(tx);
	503
11a843b7	504	if ((tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) &&
7848ba7d	505	!(tx->key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV)) {
f0706e82 JB	506	/* hwaccel - with no need for preallocated room for CCMP "
f0706e82 JB	507	* header or MIC fields */
8f20fc24	508	tx->u.tx.control->key_idx = tx->key->conf.hw_key_idx;
9ae54c84	509	return TX_CONTINUE;
f0706e82 JB	510	}
	511
	512	if (ccmp_encrypt_skb(tx, skb, test) < 0)
9ae54c84	513	return TX_DROP;
f0706e82 JB	514
	515	if (tx->u.tx.extra_frag) {
	516	int i;
f0706e82 JB	517	for (i = 0; i < tx->u.tx.num_extra_frag; i++) {
	518	if (ccmp_encrypt_skb(tx, tx->u.tx.extra_frag[i], test)
	519	< 0)
9ae54c84	520	return TX_DROP;
f0706e82 JB	521	}
	522	}
	523
9ae54c84	524	return TX_CONTINUE;
f0706e82 JB	525	}
	526
	527
9ae54c84	528	ieee80211_rx_result
4f0d18e2	529	ieee80211_crypto_ccmp_decrypt(struct ieee80211_txrx_data *rx)
f0706e82 JB	530	{
	531	struct ieee80211_hdr hdr = (struct ieee80211_hdr ) rx->skb->data;
	532	u16 fc;
	533	int hdrlen;
	534	struct ieee80211_key *key = rx->key;
	535	struct sk_buff *skb = rx->skb;
	536	u8 pn[CCMP_PN_LEN];
	537	int data_len;
0795af57	538	DECLARE_MAC_BUF(mac);
f0706e82 JB	539
	540	fc = le16_to_cpu(hdr->frame_control);
	541	hdrlen = ieee80211_get_hdrlen(fc);
	542
4f0d18e2	543	if ((rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA)
9ae54c84	544	return RX_CONTINUE;
f0706e82 JB	545
	546	data_len = skb->len - hdrlen - CCMP_HDR_LEN - CCMP_MIC_LEN;
	547	if (!rx->sta \|\| data_len < 0)
9ae54c84	548	return RX_DROP;
f0706e82 JB	549
f0706e82 JB	550	if ((rx->u.rx.status->flag & RX_FLAG_DECRYPTED) &&
7848ba7d	551	(rx->u.rx.status->flag & RX_FLAG_IV_STRIPPED))
9ae54c84	552	return RX_CONTINUE;
f0706e82 JB	553
	554	(void) ccmp_hdr2pn(pn, skb->data + hdrlen);
	555
	556	if (memcmp(pn, key->u.ccmp.rx_pn[rx->u.rx.queue], CCMP_PN_LEN) <= 0) {
	557	#ifdef CONFIG_MAC80211_DEBUG
	558	u8 *ppn = key->u.ccmp.rx_pn[rx->u.rx.queue];
0795af57	559
f0706e82	560	printk(KERN_DEBUG "%s: CCMP replay detected for RX frame from "
0795af57	561	"%s (RX PN %02x%02x%02x%02x%02x%02x <= prev. PN "
f0706e82	562	"%02x%02x%02x%02x%02x%02x)\n", rx->dev->name,
0795af57	563	print_mac(mac, rx->sta->addr),
f0706e82 JB	564	pn[0], pn[1], pn[2], pn[3], pn[4], pn[5],
	565	ppn[0], ppn[1], ppn[2], ppn[3], ppn[4], ppn[5]);
	566	#endif /* CONFIG_MAC80211_DEBUG */
	567	key->u.ccmp.replays++;
9ae54c84	568	return RX_DROP;
f0706e82 JB	569	}
f0706e82 JB	570
7848ba7d JB	571	if (!(rx->u.rx.status->flag & RX_FLAG_DECRYPTED)) {
7848ba7d JB	572	/* hardware didn't decrypt/verify MIC */
f0706e82 JB	573	u8 scratch, b_0, *aad;
	574
	575	scratch = key->u.ccmp.rx_crypto_buf;
	576	b_0 = scratch + 3 * AES_BLOCK_LEN;
	577	aad = scratch + 4 * AES_BLOCK_LEN;
	578
	579	ccmp_special_blocks(skb, pn, b_0, aad, 1);
	580
	581	if (ieee80211_aes_ccm_decrypt(
	582	key->u.ccmp.tfm, scratch, b_0, aad,
	583	skb->data + hdrlen + CCMP_HDR_LEN, data_len,
	584	skb->data + skb->len - CCMP_MIC_LEN,
	585	skb->data + hdrlen + CCMP_HDR_LEN)) {
7f3ad894 JL	586	#ifdef CONFIG_MAC80211_DEBUG
	587	if (net_ratelimit())
	588	printk(KERN_DEBUG "%s: CCMP decrypt failed "
	589	"for RX frame from %s\n", rx->dev->name,
	590	print_mac(mac, rx->sta->addr));
	591	#endif /* CONFIG_MAC80211_DEBUG */
9ae54c84	592	return RX_DROP;
f0706e82 JB	593	}
	594	}
	595
	596	memcpy(key->u.ccmp.rx_pn[rx->u.rx.queue], pn, CCMP_PN_LEN);
	597
	598	/* Remove CCMP header and MIC */
	599	skb_trim(skb, skb->len - CCMP_MIC_LEN);
	600	memmove(skb->data + CCMP_HDR_LEN, skb->data, hdrlen);
	601	skb_pull(skb, CCMP_HDR_LEN);
	602
9ae54c84	603	return RX_CONTINUE;
f0706e82	604	}