[mirror_ubuntu-kernels.git] / net / mac80211 / wpa.c

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

#include <linux/netdevice.h>
#include <linux/types.h>
#include <linux/slab.h>
#include <linux/skbuff.h>
#include <linux/compiler.h>
#include <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_txrx_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 TXRX_CONTINUE;

	if (ieee80211_get_hdr_info(skb, &sa, &da, &qos_tid, &data, &data_len))
		return TXRX_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 TXRX_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 TXRX_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 TXRX_CONTINUE;
}


ieee80211_txrx_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;

	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 TXRX_CONTINUE;

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

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

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

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

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

	return TXRX_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_txrx_result
ieee80211_tx_h_tkip_encrypt(struct ieee80211_txrx_data *tx)
{
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) tx->skb->data;
	u16 fc;
	struct ieee80211_key *key = tx->key;
	struct sk_buff *skb = tx->skb;
	int wpa_test = 0, test = 0;

	fc = le16_to_cpu(hdr->frame_control);

	if (!key || key->conf.alg != ALG_TKIP || !WLAN_FC_DATA_PRESENT(fc))
		return TXRX_CONTINUE;

	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 TXRX_CONTINUE;
	}

	if (tkip_encrypt_skb(tx, skb, test) < 0)
		return TXRX_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 TXRX_DROP;
		}
	}

	return TXRX_CONTINUE;
}


ieee80211_txrx_result
ieee80211_rx_h_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;

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

	if (!rx->key || rx->key->conf.alg != ALG_TKIP ||
	    !(rx->fc & IEEE80211_FCTL_PROTECTED) ||
	    (rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA)
		return TXRX_CONTINUE;

	if (!rx->sta || skb->len - hdrlen < 12)
		return TXRX_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 TXRX_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);
	if (res != TKIP_DECRYPT_OK || wpa_test) {
		printk(KERN_DEBUG "%s: TKIP decrypt failed for RX frame from "
		       MAC_FMT " (res=%d)\n",
		       rx->dev->name, MAC_ARG(rx->sta->addr), res);
		return TXRX_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 TXRX_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_txrx_result
ieee80211_tx_h_ccmp_encrypt(struct ieee80211_txrx_data *tx)
{
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) tx->skb->data;
	struct ieee80211_key *key = tx->key;
	u16 fc;
	struct sk_buff *skb = tx->skb;
	int test = 0;

	fc = le16_to_cpu(hdr->frame_control);

	if (!key || key->conf.alg != ALG_CCMP || !WLAN_FC_DATA_PRESENT(fc))
		return TXRX_CONTINUE;

	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 TXRX_CONTINUE;
	}

	if (ccmp_encrypt_skb(tx, skb, test) < 0)
		return TXRX_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 TXRX_DROP;
		}
	}

	return TXRX_CONTINUE;
}


ieee80211_txrx_result
ieee80211_rx_h_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;

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

	if (!key || key->conf.alg != ALG_CCMP ||
	    !(rx->fc & IEEE80211_FCTL_PROTECTED) ||
	    (rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA)
		return TXRX_CONTINUE;

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

	if ((rx->u.rx.status->flag & RX_FLAG_DECRYPTED) &&
	    (rx->u.rx.status->flag & RX_FLAG_IV_STRIPPED))
		return TXRX_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 "
		       MAC_FMT " (RX PN %02x%02x%02x%02x%02x%02x <= prev. PN "
		       "%02x%02x%02x%02x%02x%02x)\n", rx->dev->name,
		       MAC_ARG(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 TXRX_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)) {
			printk(KERN_DEBUG "%s: CCMP decrypt failed for RX "
			       "frame from " MAC_FMT "\n", rx->dev->name,
			       MAC_ARG(rx->sta->addr));
			return TXRX_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 TXRX_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
	73	ieee80211_txrx_result
	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 JB	86	!WLAN_FC_DATA_PRESENT(fc))
	87	return TXRX_CONTINUE;
	88
	89	if (ieee80211_get_hdr_info(skb, &sa, &da, &qos_tid, &data, &data_len))
	90	return TXRX_DROP;
	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	*/
	98	return TXRX_CONTINUE;
	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);
	108	return TXRX_DROP;
	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
	122	return TXRX_CONTINUE;
	123	}
	124
	125
	126	ieee80211_txrx_result
	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;
	135
	136	fc = rx->fc;
	137
3017b80b JB	138	/*
	139	* No way to verify the MIC if the hardware stripped it
	140	*/
7848ba7d	141	if (rx->u.rx.status->flag & RX_FLAG_MMIC_STRIPPED)
f0706e82 JB	142	return TXRX_CONTINUE;
f0706e82 JB	143
8f20fc24	144	if (!rx->key \|\| rx->key->conf.alg != ALG_TKIP \|\|
f0706e82 JB	145	!(rx->fc & IEEE80211_FCTL_PROTECTED) \|\| !WLAN_FC_DATA_PRESENT(fc))
	146	return TXRX_CONTINUE;
	147
f0706e82 JB	148	if (ieee80211_get_hdr_info(skb, &sa, &da, &qos_tid, &data, &data_len)
	149	\|\| data_len < MICHAEL_MIC_LEN)
	150	return TXRX_DROP;
	151
	152	data_len -= MICHAEL_MIC_LEN;
	153
	154	#if 0
	155	authenticator = fc & IEEE80211_FCTL_TODS; /* FIX */
	156	#else
	157	authenticator = 1;
	158	#endif
8f20fc24 JB	159	key = &rx->key->conf.key[authenticator ? ALG_TKIP_TEMP_AUTH_RX_MIC_KEY :
8f20fc24 JB	160	ALG_TKIP_TEMP_AUTH_TX_MIC_KEY];
f0706e82 JB	161	michael_mic(key, da, sa, qos_tid & 0x0f, data, data_len, mic);
f0706e82 JB	162	if (memcmp(mic, data + data_len, MICHAEL_MIC_LEN) != 0 \|\| wpa_test) {
badffb72	163	if (!(rx->flags & IEEE80211_TXRXD_RXRA_MATCH))
f0706e82 JB	164	return TXRX_DROP;
	165
	166	printk(KERN_DEBUG "%s: invalid Michael MIC in data frame from "
	167	MAC_FMT "\n", rx->dev->name, MAC_ARG(sa));
	168
8f20fc24	169	mac80211_ev_michael_mic_failure(rx->dev, rx->key->conf.keyidx,
eb063c17 JB	170	(void *) skb->data);
eb063c17 JB	171	return TXRX_DROP;
f0706e82 JB	172	}
f0706e82 JB	173
f0706e82 JB	174	/* remove Michael MIC from payload */
	175	skb_trim(skb, skb->len - MICHAEL_MIC_LEN);
	176
	177	return TXRX_CONTINUE;
	178	}
	179
	180
	181	static int tkip_encrypt_skb(struct ieee80211_txrx_data *tx,
	182	struct sk_buff *skb, int test)
	183	{
	184	struct ieee80211_hdr hdr = (struct ieee80211_hdr ) skb->data;
	185	struct ieee80211_key *key = tx->key;
	186	int hdrlen, len, tailneed;
	187	u16 fc;
	188	u8 *pos;
	189
	190	fc = le16_to_cpu(hdr->frame_control);
	191	hdrlen = ieee80211_get_hdrlen(fc);
	192	len = skb->len - hdrlen;
	193
11a843b7	194	if (tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)
8f20fc24	195	tailneed = 0;
11a843b7 JB	196	else
11a843b7 JB	197	tailneed = TKIP_ICV_LEN;
8f20fc24	198
f0706e82 JB	199	if ((skb_headroom(skb) < TKIP_IV_LEN \|\|
	200	skb_tailroom(skb) < tailneed)) {
	201	I802_DEBUG_INC(tx->local->tx_expand_skb_head);
	202	if (unlikely(pskb_expand_head(skb, TKIP_IV_LEN, tailneed,
	203	GFP_ATOMIC)))
	204	return -1;
	205	}
	206
	207	pos = skb_push(skb, TKIP_IV_LEN);
	208	memmove(pos, pos + TKIP_IV_LEN, hdrlen);
	209	pos += hdrlen;
	210
	211	/* Increase IV for the frame */
	212	key->u.tkip.iv16++;
	213	if (key->u.tkip.iv16 == 0)
	214	key->u.tkip.iv32++;
	215
11a843b7	216	if (tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) {
f0706e82 JB	217	hdr = (struct ieee80211_hdr *)skb->data;
	218
	219	/* hwaccel - with preallocated room for IV */
	220	ieee80211_tkip_add_iv(pos, key,
	221	(u8) (key->u.tkip.iv16 >> 8),
	222	(u8) (((key->u.tkip.iv16 >> 8) \| 0x20) &
	223	0x7f),
	224	(u8) key->u.tkip.iv16);
	225
8f20fc24	226	tx->u.tx.control->key_idx = tx->key->conf.hw_key_idx;
f0706e82 JB	227	return 0;
	228	}
	229
	230	/* Add room for ICV */
	231	skb_put(skb, TKIP_ICV_LEN);
	232
	233	hdr = (struct ieee80211_hdr *) skb->data;
	234	ieee80211_tkip_encrypt_data(tx->local->wep_tx_tfm,
	235	key, pos, len, hdr->addr2);
	236	return 0;
	237	}
	238
	239
	240	ieee80211_txrx_result
	241	ieee80211_tx_h_tkip_encrypt(struct ieee80211_txrx_data *tx)
	242	{
	243	struct ieee80211_hdr hdr = (struct ieee80211_hdr ) tx->skb->data;
	244	u16 fc;
	245	struct ieee80211_key *key = tx->key;
	246	struct sk_buff *skb = tx->skb;
	247	int wpa_test = 0, test = 0;
	248
	249	fc = le16_to_cpu(hdr->frame_control);
	250
8f20fc24	251	if (!key \|\| key->conf.alg != ALG_TKIP \|\| !WLAN_FC_DATA_PRESENT(fc))
f0706e82 JB	252	return TXRX_CONTINUE;
	253
	254	tx->u.tx.control->icv_len = TKIP_ICV_LEN;
	255	tx->u.tx.control->iv_len = TKIP_IV_LEN;
	256	ieee80211_tx_set_iswep(tx);
	257
11a843b7	258	if ((tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) &&
7848ba7d	259	!(tx->key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV) &&
f0706e82 JB	260	!wpa_test) {
f0706e82 JB	261	/* hwaccel - with no need for preallocated room for IV/ICV */
8f20fc24	262	tx->u.tx.control->key_idx = tx->key->conf.hw_key_idx;
f0706e82 JB	263	return TXRX_CONTINUE;
	264	}
	265
	266	if (tkip_encrypt_skb(tx, skb, test) < 0)
	267	return TXRX_DROP;
	268
	269	if (tx->u.tx.extra_frag) {
	270	int i;
	271	for (i = 0; i < tx->u.tx.num_extra_frag; i++) {
	272	if (tkip_encrypt_skb(tx, tx->u.tx.extra_frag[i], test)
	273	< 0)
	274	return TXRX_DROP;
	275	}
	276	}
	277
	278	return TXRX_CONTINUE;
	279	}
	280
	281
	282	ieee80211_txrx_result
	283	ieee80211_rx_h_tkip_decrypt(struct ieee80211_txrx_data *rx)
	284	{
	285	struct ieee80211_hdr hdr = (struct ieee80211_hdr ) rx->skb->data;
	286	u16 fc;
	287	int hdrlen, res, hwaccel = 0, wpa_test = 0;
	288	struct ieee80211_key *key = rx->key;
	289	struct sk_buff *skb = rx->skb;
	290
	291	fc = le16_to_cpu(hdr->frame_control);
	292	hdrlen = ieee80211_get_hdrlen(fc);
	293
8f20fc24	294	if (!rx->key \|\| rx->key->conf.alg != ALG_TKIP \|\|
f0706e82 JB	295	!(rx->fc & IEEE80211_FCTL_PROTECTED) \|\|
	296	(rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA)
	297	return TXRX_CONTINUE;
	298
	299	if (!rx->sta \|\| skb->len - hdrlen < 12)
	300	return TXRX_DROP;
	301
7848ba7d JB	302	if (rx->u.rx.status->flag & RX_FLAG_DECRYPTED) {
	303	if (rx->u.rx.status->flag & RX_FLAG_IV_STRIPPED) {
	304	/*
	305	* Hardware took care of all processing, including
	306	* replay protection, and stripped the ICV/IV so
	307	* we cannot do any checks here.
	308	*/
f0706e82 JB	309	return TXRX_CONTINUE;
	310	}
	311
	312	/* let TKIP code verify IV, but skip decryption */
	313	hwaccel = 1;
	314	}
	315
	316	res = ieee80211_tkip_decrypt_data(rx->local->wep_rx_tfm,
	317	key, skb->data + hdrlen,
	318	skb->len - hdrlen, rx->sta->addr,
	319	hwaccel, rx->u.rx.queue);
	320	if (res != TKIP_DECRYPT_OK \|\| wpa_test) {
	321	printk(KERN_DEBUG "%s: TKIP decrypt failed for RX frame from "
	322	MAC_FMT " (res=%d)\n",
	323	rx->dev->name, MAC_ARG(rx->sta->addr), res);
	324	return TXRX_DROP;
	325	}
	326
	327	/* Trim ICV */
	328	skb_trim(skb, skb->len - TKIP_ICV_LEN);
	329
	330	/* Remove IV */
	331	memmove(skb->data + TKIP_IV_LEN, skb->data, hdrlen);
	332	skb_pull(skb, TKIP_IV_LEN);
	333
	334	return TXRX_CONTINUE;
	335	}
	336
	337
	338	static void ccmp_special_blocks(struct sk_buff skb, u8 pn, u8 b_0, u8 aad,
	339	int encrypted)
	340	{
	341	u16 fc;
	342	int a4_included, qos_included;
	343	u8 qos_tid, fc_pos, data, sa, da;
	344	int len_a;
	345	size_t data_len;
	346	struct ieee80211_hdr hdr = (struct ieee80211_hdr ) skb->data;
	347
	348	fc_pos = (u8 *) &hdr->frame_control;
	349	fc = fc_pos[0] ^ (fc_pos[1] << 8);
	350	a4_included = (fc & (IEEE80211_FCTL_TODS \| IEEE80211_FCTL_FROMDS)) ==
	351	(IEEE80211_FCTL_TODS \| IEEE80211_FCTL_FROMDS);
	352
	353	ieee80211_get_hdr_info(skb, &sa, &da, &qos_tid, &data, &data_len);
	354	data_len -= CCMP_HDR_LEN + (encrypted ? CCMP_MIC_LEN : 0);
	355	if (qos_tid & 0x80) {
	356	qos_included = 1;
	357	qos_tid &= 0x0f;
	358	} else
	359	qos_included = 0;
	360	/* First block, b_0 */
	361
	362	b_0[0] = 0x59; /* flags: Adata: 1, M: 011, L: 001 */
	363	/* Nonce: QoS Priority \| A2 \| PN */
	364	b_0[1] = qos_tid;
	365	memcpy(&b_0[2], hdr->addr2, 6);
	366	memcpy(&b_0[8], pn, CCMP_PN_LEN);
	367	/* l(m) */
	368	b_0[14] = (data_len >> 8) & 0xff;
	369	b_0[15] = data_len & 0xff;
	370
	371
	372	/* AAD (extra authenticate-only data) / masked 802.11 header
373	* FC \| A1 \| A2 \| A3 \| SC \| [A4] \| [QC] */
374
375	len_a = a4_included ? 28 : 22;
376	if (qos_included)
377	len_a += 2;
378
379	aad[0] = 0; /* (len_a >> 8) & 0xff; */
380	aad[1] = len_a & 0xff;
381	/* Mask FC: zero subtype b4 b5 b6 */
382	aad[2] = fc_pos[0] & ~(BIT(4) \| BIT(5) \| BIT(6));
383	/* Retry, PwrMgt, MoreData; set Protected */
384	aad[3] = (fc_pos[1] & ~(BIT(3) \| BIT(4) \| BIT(5))) \| BIT(6);
385	memcpy(&aad[4], &hdr->addr1, 18);
386
387	/* Mask Seq#, leave Frag# */
388	aad[22] = ((u8 ) &hdr->seq_ctrl) & 0x0f;
389	aad[23] = 0;
390	if (a4_included) {
391	memcpy(&aad[24], hdr->addr4, 6);
392	aad[30] = 0;
393	aad[31] = 0;
394	} else
395	memset(&aad[24], 0, 8);
396	if (qos_included) {
397	u8 *dpos = &aad[a4_included ? 30 : 24];
398
399	/* Mask QoS Control field */
400	dpos[0] = qos_tid;
401	dpos[1] = 0;
402	}
403	}
404
405
406	static inline void ccmp_pn2hdr(u8 hdr, u8 pn, int key_id)
407	{
408	hdr[0] = pn[5];
409	hdr[1] = pn[4];
410	hdr[2] = 0;
411	hdr[3] = 0x20 \| (key_id << 6);
412	hdr[4] = pn[3];
413	hdr[5] = pn[2];
414	hdr[6] = pn[1];
415	hdr[7] = pn[0];
416	}
417
418
419	static inline int ccmp_hdr2pn(u8 pn, u8 hdr)
420	{
421	pn[0] = hdr[7];
422	pn[1] = hdr[6];
423	pn[2] = hdr[5];
424	pn[3] = hdr[4];
425	pn[4] = hdr[1];
426	pn[5] = hdr[0];
427	return (hdr[3] >> 6) & 0x03;
428	}
429
430
431	static int ccmp_encrypt_skb(struct ieee80211_txrx_data *tx,
432	struct sk_buff *skb, int test)
433	{
434	struct ieee80211_hdr hdr = (struct ieee80211_hdr ) skb->data;
435	struct ieee80211_key *key = tx->key;
436	int hdrlen, len, tailneed;
437	u16 fc;
438	u8 pos, pn, b_0, aad, *scratch;
439	int i;
440
441	scratch = key->u.ccmp.tx_crypto_buf;
442	b_0 = scratch + 3 * AES_BLOCK_LEN;
443	aad = scratch + 4 * AES_BLOCK_LEN;
444
445	fc = le16_to_cpu(hdr->frame_control);
446	hdrlen = ieee80211_get_hdrlen(fc);
447	len = skb->len - hdrlen;
448
11a843b7	449	if (key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)
8f20fc24	450	tailneed = 0;
11a843b7 JB	451	else
11a843b7 JB	452	tailneed = CCMP_MIC_LEN;
f0706e82 JB	453
	454	if ((skb_headroom(skb) < CCMP_HDR_LEN \|\|
	455	skb_tailroom(skb) < tailneed)) {
	456	I802_DEBUG_INC(tx->local->tx_expand_skb_head);
	457	if (unlikely(pskb_expand_head(skb, CCMP_HDR_LEN, tailneed,
	458	GFP_ATOMIC)))
	459	return -1;
	460	}
	461
	462	pos = skb_push(skb, CCMP_HDR_LEN);
	463	memmove(pos, pos + CCMP_HDR_LEN, hdrlen);
	464	hdr = (struct ieee80211_hdr *) pos;
	465	pos += hdrlen;
	466
	467	/* PN = PN + 1 */
	468	pn = key->u.ccmp.tx_pn;
	469
	470	for (i = CCMP_PN_LEN - 1; i >= 0; i--) {
	471	pn[i]++;
	472	if (pn[i])
	473	break;
	474	}
	475
8f20fc24	476	ccmp_pn2hdr(pos, pn, key->conf.keyidx);
f0706e82	477
11a843b7	478	if (key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) {
f0706e82	479	/* hwaccel - with preallocated room for CCMP header */
8f20fc24	480	tx->u.tx.control->key_idx = key->conf.hw_key_idx;
f0706e82 JB	481	return 0;
	482	}
	483
	484	pos += CCMP_HDR_LEN;
	485	ccmp_special_blocks(skb, pn, b_0, aad, 0);
	486	ieee80211_aes_ccm_encrypt(key->u.ccmp.tfm, scratch, b_0, aad, pos, len,
	487	pos, skb_put(skb, CCMP_MIC_LEN));
	488
	489	return 0;
	490	}
	491
	492
	493	ieee80211_txrx_result
	494	ieee80211_tx_h_ccmp_encrypt(struct ieee80211_txrx_data *tx)
	495	{
	496	struct ieee80211_hdr hdr = (struct ieee80211_hdr ) tx->skb->data;
	497	struct ieee80211_key *key = tx->key;
	498	u16 fc;
	499	struct sk_buff *skb = tx->skb;
	500	int test = 0;
	501
	502	fc = le16_to_cpu(hdr->frame_control);
	503
8f20fc24	504	if (!key \|\| key->conf.alg != ALG_CCMP \|\| !WLAN_FC_DATA_PRESENT(fc))
f0706e82 JB	505	return TXRX_CONTINUE;
	506
	507	tx->u.tx.control->icv_len = CCMP_MIC_LEN;
	508	tx->u.tx.control->iv_len = CCMP_HDR_LEN;
	509	ieee80211_tx_set_iswep(tx);
	510
11a843b7	511	if ((tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) &&
7848ba7d	512	!(tx->key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV)) {
f0706e82 JB	513	/* hwaccel - with no need for preallocated room for CCMP "
f0706e82 JB	514	* header or MIC fields */
8f20fc24	515	tx->u.tx.control->key_idx = tx->key->conf.hw_key_idx;
f0706e82 JB	516	return TXRX_CONTINUE;
	517	}
	518
	519	if (ccmp_encrypt_skb(tx, skb, test) < 0)
	520	return TXRX_DROP;
	521
	522	if (tx->u.tx.extra_frag) {
	523	int i;
f0706e82 JB	524	for (i = 0; i < tx->u.tx.num_extra_frag; i++) {
	525	if (ccmp_encrypt_skb(tx, tx->u.tx.extra_frag[i], test)
	526	< 0)
	527	return TXRX_DROP;
	528	}
	529	}
	530
	531	return TXRX_CONTINUE;
	532	}
	533
	534
	535	ieee80211_txrx_result
	536	ieee80211_rx_h_ccmp_decrypt(struct ieee80211_txrx_data *rx)
	537	{
	538	struct ieee80211_hdr hdr = (struct ieee80211_hdr ) rx->skb->data;
	539	u16 fc;
	540	int hdrlen;
	541	struct ieee80211_key *key = rx->key;
	542	struct sk_buff *skb = rx->skb;
	543	u8 pn[CCMP_PN_LEN];
	544	int data_len;
	545
	546	fc = le16_to_cpu(hdr->frame_control);
	547	hdrlen = ieee80211_get_hdrlen(fc);
	548
8f20fc24	549	if (!key \|\| key->conf.alg != ALG_CCMP \|\|
f0706e82 JB	550	!(rx->fc & IEEE80211_FCTL_PROTECTED) \|\|
	551	(rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA)
	552	return TXRX_CONTINUE;
	553
	554	data_len = skb->len - hdrlen - CCMP_HDR_LEN - CCMP_MIC_LEN;
	555	if (!rx->sta \|\| data_len < 0)
	556	return TXRX_DROP;
	557
	558	if ((rx->u.rx.status->flag & RX_FLAG_DECRYPTED) &&
7848ba7d	559	(rx->u.rx.status->flag & RX_FLAG_IV_STRIPPED))
f0706e82 JB	560	return TXRX_CONTINUE;
	561
	562	(void) ccmp_hdr2pn(pn, skb->data + hdrlen);
	563
	564	if (memcmp(pn, key->u.ccmp.rx_pn[rx->u.rx.queue], CCMP_PN_LEN) <= 0) {
	565	#ifdef CONFIG_MAC80211_DEBUG
	566	u8 *ppn = key->u.ccmp.rx_pn[rx->u.rx.queue];
	567	printk(KERN_DEBUG "%s: CCMP replay detected for RX frame from "
	568	MAC_FMT " (RX PN %02x%02x%02x%02x%02x%02x <= prev. PN "
	569	"%02x%02x%02x%02x%02x%02x)\n", rx->dev->name,
	570	MAC_ARG(rx->sta->addr),
	571	pn[0], pn[1], pn[2], pn[3], pn[4], pn[5],
	572	ppn[0], ppn[1], ppn[2], ppn[3], ppn[4], ppn[5]);
	573	#endif /* CONFIG_MAC80211_DEBUG */
	574	key->u.ccmp.replays++;
	575	return TXRX_DROP;
	576	}
	577
7848ba7d JB	578	if (!(rx->u.rx.status->flag & RX_FLAG_DECRYPTED)) {
7848ba7d JB	579	/* hardware didn't decrypt/verify MIC */
f0706e82 JB	580	u8 scratch, b_0, *aad;
	581
	582	scratch = key->u.ccmp.rx_crypto_buf;
	583	b_0 = scratch + 3 * AES_BLOCK_LEN;
	584	aad = scratch + 4 * AES_BLOCK_LEN;
	585
	586	ccmp_special_blocks(skb, pn, b_0, aad, 1);
	587
	588	if (ieee80211_aes_ccm_decrypt(
	589	key->u.ccmp.tfm, scratch, b_0, aad,
	590	skb->data + hdrlen + CCMP_HDR_LEN, data_len,
	591	skb->data + skb->len - CCMP_MIC_LEN,
	592	skb->data + hdrlen + CCMP_HDR_LEN)) {
	593	printk(KERN_DEBUG "%s: CCMP decrypt failed for RX "
	594	"frame from " MAC_FMT "\n", rx->dev->name,
	595	MAC_ARG(rx->sta->addr));
	596	return TXRX_DROP;
	597	}
	598	}
	599
	600	memcpy(key->u.ccmp.rx_pn[rx->u.rx.queue], pn, CCMP_PN_LEN);
	601
	602	/* Remove CCMP header and MIC */
	603	skb_trim(skb, skb->len - CCMP_MIC_LEN);
	604	memmove(skb->data + CCMP_HDR_LEN, skb->data, hdrlen);
	605	skb_pull(skb, CCMP_HDR_LEN);
	606
	607	return TXRX_CONTINUE;
	608	}
	609