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

/*
 * Copyright 2002-2004, Instant802 Networks, Inc.
 * Copyright 2008, Jouni Malinen <j@w1.fi>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <linux/netdevice.h>
#include <linux/types.h>
#include <linux/slab.h>
#include <linux/skbuff.h>
#include <linux/compiler.h>
#include <linux/ieee80211.h>
#include <asm/unaligned.h>
#include <net/mac80211.h>

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

ieee80211_tx_result
ieee80211_tx_h_michael_mic_add(struct ieee80211_tx_data *tx)
{
	u8 *data, *key, *mic, key_offset;
	size_t data_len;
	unsigned int hdrlen;
	struct ieee80211_hdr *hdr;
	struct sk_buff *skb = tx->skb;
	int authenticator;
	int wpa_test = 0;
	int tail;

	hdr = (struct ieee80211_hdr *)skb->data;
	if (!tx->key || tx->key->conf.alg != ALG_TKIP || skb->len < 24 ||
	    !ieee80211_is_data_present(hdr->frame_control))
		return TX_CONTINUE;

	hdrlen = ieee80211_hdrlen(hdr->frame_control);
	if (skb->len < hdrlen)
		return TX_DROP;

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

	if ((tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) &&
	    !(tx->flags & IEEE80211_TX_FRAGMENTED) &&
	    !(tx->key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC) &&
	    !wpa_test) {
		/* hwaccel - with no need for preallocated room for MMIC */
		return TX_CONTINUE;
	}

	tail = MICHAEL_MIC_LEN;
	if (!(tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
		tail += TKIP_ICV_LEN;

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

#if 0
	authenticator = fc & IEEE80211_FCTL_FROMDS; /* FIX */
#else
	authenticator = 1;
#endif
	key_offset = authenticator ?
		NL80211_TKIP_DATA_OFFSET_TX_MIC_KEY :
		NL80211_TKIP_DATA_OFFSET_RX_MIC_KEY;
	key = &tx->key->conf.key[key_offset];
	mic = skb_put(skb, MICHAEL_MIC_LEN);
	michael_mic(key, hdr, data, data_len, mic);

	return TX_CONTINUE;
}


ieee80211_rx_result
ieee80211_rx_h_michael_mic_verify(struct ieee80211_rx_data *rx)
{
	u8 *data, *key = NULL, key_offset;
	size_t data_len;
	unsigned int hdrlen;
	struct ieee80211_hdr *hdr;
	u8 mic[MICHAEL_MIC_LEN];
	struct sk_buff *skb = rx->skb;
	int authenticator = 1, wpa_test = 0;

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

	hdr = (struct ieee80211_hdr *)skb->data;
	if (!rx->key || rx->key->conf.alg != ALG_TKIP ||
	    !ieee80211_has_protected(hdr->frame_control) ||
	    !ieee80211_is_data_present(hdr->frame_control))
		return RX_CONTINUE;

	hdrlen = ieee80211_hdrlen(hdr->frame_control);
	if (skb->len < hdrlen + MICHAEL_MIC_LEN)
		return RX_DROP_UNUSABLE;

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

#if 0
	authenticator = fc & IEEE80211_FCTL_TODS; /* FIX */
#else
	authenticator = 1;
#endif
	key_offset = authenticator ?
		NL80211_TKIP_DATA_OFFSET_RX_MIC_KEY :
		NL80211_TKIP_DATA_OFFSET_TX_MIC_KEY;
	key = &rx->key->conf.key[key_offset];
	michael_mic(key, hdr, data, data_len, mic);
	if (memcmp(mic, data + data_len, MICHAEL_MIC_LEN) != 0 || wpa_test) {
		if (!(rx->flags & IEEE80211_RX_RA_MATCH))
			return RX_DROP_UNUSABLE;

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

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

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

	return RX_CONTINUE;
}


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

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

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

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

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

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

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

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

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

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

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


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

	ieee80211_tx_set_protected(tx);

	do {
		if (tkip_encrypt_skb(tx, skb) < 0)
			return TX_DROP;
	} while ((skb = skb->next));

	return TX_CONTINUE;
}


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

	hdrlen = ieee80211_hdrlen(hdr->frame_control);

	if (!ieee80211_is_data(hdr->frame_control))
		return RX_CONTINUE;

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

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

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

	res = ieee80211_tkip_decrypt_data(rx->local->wep_rx_tfm,
					  key, skb->data + hdrlen,
					  skb->len - hdrlen, rx->sta->sta.addr,
					  hdr->addr1, hwaccel, rx->queue,
					  &rx->tkip_iv32,
					  &rx->tkip_iv16);
	if (res != TKIP_DECRYPT_OK || wpa_test)
		return RX_DROP_UNUSABLE;

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

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

	return RX_CONTINUE;
}


static void ccmp_special_blocks(struct sk_buff *skb, u8 *pn, u8 *scratch,
				int encrypted)
{
	__le16 mask_fc;
	int a4_included, mgmt;
	u8 qos_tid;
	u8 *b_0, *aad;
	u16 data_len, len_a;
	unsigned int hdrlen;
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;

	b_0 = scratch + 3 * AES_BLOCK_LEN;
	aad = scratch + 4 * AES_BLOCK_LEN;

	/*
	 * Mask FC: zero subtype b4 b5 b6 (if not mgmt)
	 * Retry, PwrMgt, MoreData; set Protected
	 */
	mgmt = ieee80211_is_mgmt(hdr->frame_control);
	mask_fc = hdr->frame_control;
	mask_fc &= ~cpu_to_le16(IEEE80211_FCTL_RETRY |
				IEEE80211_FCTL_PM | IEEE80211_FCTL_MOREDATA);
	if (!mgmt)
		mask_fc &= ~cpu_to_le16(0x0070);
	mask_fc |= cpu_to_le16(IEEE80211_FCTL_PROTECTED);

	hdrlen = ieee80211_hdrlen(hdr->frame_control);
	len_a = hdrlen - 2;
	a4_included = ieee80211_has_a4(hdr->frame_control);

	if (ieee80211_is_data_qos(hdr->frame_control))
		qos_tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
	else
		qos_tid = 0;

	data_len = skb->len - hdrlen - CCMP_HDR_LEN;
	if (encrypted)
		data_len -= CCMP_MIC_LEN;

	/* First block, b_0 */
	b_0[0] = 0x59; /* flags: Adata: 1, M: 011, L: 001 */
	/* Nonce: Nonce Flags | A2 | PN
	 * Nonce Flags: Priority (b0..b3) | Management (b4) | Reserved (b5..b7)
	 */
	b_0[1] = qos_tid | (mgmt << 4);
	memcpy(&b_0[2], hdr->addr2, ETH_ALEN);
	memcpy(&b_0[8], pn, CCMP_PN_LEN);
	/* l(m) */
	put_unaligned_be16(data_len, &b_0[14]);

	/* AAD (extra authenticate-only data) / masked 802.11 header
	 * FC | A1 | A2 | A3 | SC | [A4] | [QC] */
	put_unaligned_be16(len_a, &aad[0]);
	put_unaligned(mask_fc, (__le16 *)&aad[2]);
	memcpy(&aad[4], &hdr->addr1, 3 * ETH_ALEN);

	/* Mask Seq#, leave Frag# */
	aad[22] = *((u8 *) &hdr->seq_ctrl) & 0x0f;
	aad[23] = 0;

	if (a4_included) {
		memcpy(&aad[24], hdr->addr4, ETH_ALEN);
		aad[30] = qos_tid;
		aad[31] = 0;
	} else {
		memset(&aad[24], 0, ETH_ALEN + IEEE80211_QOS_CTL_LEN);
		aad[24] = qos_tid;
	}
}


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


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


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

	skip_hw = (tx->key->conf.flags & IEEE80211_KEY_FLAG_SW_MGMT) &&
		ieee80211_is_mgmt(hdr->frame_control);

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

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

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

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

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

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

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

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

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

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

	return 0;
}


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

	ieee80211_tx_set_protected(tx);

	do {
		if (ccmp_encrypt_skb(tx, skb) < 0)
			return TX_DROP;
	} while ((skb = skb->next));

	return TX_CONTINUE;
}


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

	hdrlen = ieee80211_hdrlen(hdr->frame_control);

	if (!ieee80211_is_data(hdr->frame_control) &&
	    !ieee80211_is_robust_mgmt_frame(hdr))
		return RX_CONTINUE;

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

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

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

	if (memcmp(pn, key->u.ccmp.rx_pn[rx->queue], CCMP_PN_LEN) <= 0) {
		key->u.ccmp.replays++;
		return RX_DROP_UNUSABLE;
	}

	if (!(rx->status->flag & RX_FLAG_DECRYPTED)) {
		/* hardware didn't decrypt/verify MIC */
		ccmp_special_blocks(skb, pn, key->u.ccmp.rx_crypto_buf, 1);

		if (ieee80211_aes_ccm_decrypt(
			    key->u.ccmp.tfm, key->u.ccmp.rx_crypto_buf,
			    skb->data + hdrlen + CCMP_HDR_LEN, data_len,
			    skb->data + skb->len - CCMP_MIC_LEN,
			    skb->data + hdrlen + CCMP_HDR_LEN))
			return RX_DROP_UNUSABLE;
	}

	memcpy(key->u.ccmp.rx_pn[rx->queue], pn, CCMP_PN_LEN);

	/* Remove CCMP header and MIC */
	skb_trim(skb, skb->len - CCMP_MIC_LEN);
	memmove(skb->data + CCMP_HDR_LEN, skb->data, hdrlen);
	skb_pull(skb, CCMP_HDR_LEN);

	return RX_CONTINUE;
}


static void bip_aad(struct sk_buff *skb, u8 *aad)
{
	/* BIP AAD: FC(masked) || A1 || A2 || A3 */

	/* FC type/subtype */
	aad[0] = skb->data[0];
	/* Mask FC Retry, PwrMgt, MoreData flags to zero */
	aad[1] = skb->data[1] & ~(BIT(4) | BIT(5) | BIT(6));
	/* A1 || A2 || A3 */
	memcpy(aad + 2, skb->data + 4, 3 * ETH_ALEN);
}


static inline void bip_ipn_swap(u8 *d, const u8 *s)
{
	*d++ = s[5];
	*d++ = s[4];
	*d++ = s[3];
	*d++ = s[2];
	*d++ = s[1];
	*d = s[0];
}


ieee80211_tx_result
ieee80211_crypto_aes_cmac_encrypt(struct ieee80211_tx_data *tx)
{
	struct sk_buff *skb = tx->skb;
	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
	struct ieee80211_key *key = tx->key;
	struct ieee80211_mmie *mmie;
	u8 *pn, aad[20];
	int i;

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

	if (WARN_ON(skb_tailroom(skb) < sizeof(*mmie)))
		return TX_DROP;

	mmie = (struct ieee80211_mmie *) skb_put(skb, sizeof(*mmie));
	mmie->element_id = WLAN_EID_MMIE;
	mmie->length = sizeof(*mmie) - 2;
	mmie->key_id = cpu_to_le16(key->conf.keyidx);

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

	for (i = sizeof(key->u.aes_cmac.tx_pn) - 1; i >= 0; i--) {
		pn[i]++;
		if (pn[i])
			break;
	}
	bip_ipn_swap(mmie->sequence_number, pn);

	bip_aad(skb, aad);

	/*
	 * MIC = AES-128-CMAC(IGTK, AAD || Management Frame Body || MMIE, 64)
	 */
	ieee80211_aes_cmac(key->u.aes_cmac.tfm, key->u.aes_cmac.tx_crypto_buf,
			   aad, skb->data + 24, skb->len - 24, mmie->mic);

	return TX_CONTINUE;
}


ieee80211_rx_result
ieee80211_crypto_aes_cmac_decrypt(struct ieee80211_rx_data *rx)
{
	struct sk_buff *skb = rx->skb;
	struct ieee80211_key *key = rx->key;
	struct ieee80211_mmie *mmie;
	u8 aad[20], mic[8], ipn[6];
	struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) skb->data;

	if (!ieee80211_is_mgmt(hdr->frame_control))
		return RX_CONTINUE;

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

	if (skb->len < 24 + sizeof(*mmie))
		return RX_DROP_UNUSABLE;

	mmie = (struct ieee80211_mmie *)
		(skb->data + skb->len - sizeof(*mmie));
	if (mmie->element_id != WLAN_EID_MMIE ||
	    mmie->length != sizeof(*mmie) - 2)
		return RX_DROP_UNUSABLE; /* Invalid MMIE */

	bip_ipn_swap(ipn, mmie->sequence_number);

	if (memcmp(ipn, key->u.aes_cmac.rx_pn, 6) <= 0) {
		key->u.aes_cmac.replays++;
		return RX_DROP_UNUSABLE;
	}

	if (!(rx->status->flag & RX_FLAG_DECRYPTED)) {
		/* hardware didn't decrypt/verify MIC */
		bip_aad(skb, aad);
		ieee80211_aes_cmac(key->u.aes_cmac.tfm,
				   key->u.aes_cmac.rx_crypto_buf, aad,
				   skb->data + 24, skb->len - 24, mic);
		if (memcmp(mic, mmie->mic, sizeof(mmie->mic)) != 0) {
			key->u.aes_cmac.icverrors++;
			return RX_DROP_UNUSABLE;
		}
	}

	memcpy(key->u.aes_cmac.rx_pn, ipn, 6);

	/* Remove MMIE */
	skb_trim(skb, skb->len - sizeof(*mmie));

	return RX_CONTINUE;
}
Commit	Line	Data
f0706e82 JB	1	/*
f0706e82 JB	2	* Copyright 2002-2004, Instant802 Networks, Inc.
765cb46a	3	* Copyright 2008, Jouni Malinen <j@w1.fi>
f0706e82 JB	4	*
	5	* This program is free software; you can redistribute it and/or modify
	6	* it under the terms of the GNU General Public License version 2 as
	7	* published by the Free Software Foundation.
	8	*/
	9
	10	#include <linux/netdevice.h>
	11	#include <linux/types.h>
	12	#include <linux/slab.h>
	13	#include <linux/skbuff.h>
	14	#include <linux/compiler.h>
f14df804 HH	15	#include <linux/ieee80211.h>
f14df804 HH	16	#include <asm/unaligned.h>
f0706e82	17	#include <net/mac80211.h>
eb063c17	18
f0706e82 JB	19	#include "ieee80211_i.h"
	20	#include "michael.h"
	21	#include "tkip.h"
	22	#include "aes_ccm.h"
765cb46a	23	#include "aes_cmac.h"
f0706e82 JB	24	#include "wpa.h"
f0706e82 JB	25
9ae54c84	26	ieee80211_tx_result
5cf121c3	27	ieee80211_tx_h_michael_mic_add(struct ieee80211_tx_data *tx)
f0706e82	28	{
8e8862b7	29	u8 data, key, *mic, key_offset;
f0706e82	30	size_t data_len;
8e8862b7 HH	31	unsigned int hdrlen;
8e8862b7 HH	32	struct ieee80211_hdr *hdr;
f0706e82 JB	33	struct sk_buff *skb = tx->skb;
	34	int authenticator;
	35	int wpa_test = 0;
23c0752a	36	int tail;
f0706e82	37
c34498b9	38	hdr = (struct ieee80211_hdr *)skb->data;
8f20fc24	39	if (!tx->key \|\| tx->key->conf.alg != ALG_TKIP \|\| skb->len < 24 \|\|
c34498b9	40	!ieee80211_is_data_present(hdr->frame_control))
9ae54c84	41	return TX_CONTINUE;
f0706e82	42
8e8862b7 HH	43	hdrlen = ieee80211_hdrlen(hdr->frame_control);
8e8862b7 HH	44	if (skb->len < hdrlen)
9ae54c84	45	return TX_DROP;
f0706e82	46
8e8862b7 HH	47	data = skb->data + hdrlen;
	48	data_len = skb->len - hdrlen;
	49
11a843b7	50	if ((tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) &&
5cf121c3	51	!(tx->flags & IEEE80211_TX_FRAGMENTED) &&
7848ba7d	52	!(tx->key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC) &&
f0706e82	53	!wpa_test) {
c6a1fa12	54	/* hwaccel - with no need for preallocated room for MMIC */
9ae54c84	55	return TX_CONTINUE;
f0706e82 JB	56	}
f0706e82 JB	57
23c0752a JB	58	tail = MICHAEL_MIC_LEN;
	59	if (!(tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
	60	tail += TKIP_ICV_LEN;
	61
	62	if (WARN_ON(skb_tailroom(skb) < tail \|\|
	63	skb_headroom(skb) < TKIP_IV_LEN))
	64	return TX_DROP;
f0706e82 JB	65
	66	#if 0
	67	authenticator = fc & IEEE80211_FCTL_FROMDS; /* FIX */
	68	#else
	69	authenticator = 1;
	70	#endif
ffd7891d LR	71	key_offset = authenticator ?
	72	NL80211_TKIP_DATA_OFFSET_TX_MIC_KEY :
	73	NL80211_TKIP_DATA_OFFSET_RX_MIC_KEY;
	74	key = &tx->key->conf.key[key_offset];
f0706e82	75	mic = skb_put(skb, MICHAEL_MIC_LEN);
8e8862b7	76	michael_mic(key, hdr, data, data_len, mic);
f0706e82	77
9ae54c84	78	return TX_CONTINUE;
f0706e82 JB	79	}
	80
	81
9ae54c84	82	ieee80211_rx_result
5cf121c3	83	ieee80211_rx_h_michael_mic_verify(struct ieee80211_rx_data *rx)
f0706e82	84	{
8e8862b7	85	u8 data, key = NULL, key_offset;
f0706e82	86	size_t data_len;
8e8862b7 HH	87	unsigned int hdrlen;
8e8862b7 HH	88	struct ieee80211_hdr *hdr;
f0706e82 JB	89	u8 mic[MICHAEL_MIC_LEN];
	90	struct sk_buff *skb = rx->skb;
	91	int authenticator = 1, wpa_test = 0;
	92
c6a1fa12	93	/* No way to verify the MIC if the hardware stripped it */
5cf121c3	94	if (rx->status->flag & RX_FLAG_MMIC_STRIPPED)
9ae54c84	95	return RX_CONTINUE;
f0706e82	96
c34498b9	97	hdr = (struct ieee80211_hdr *)skb->data;
8f20fc24	98	if (!rx->key \|\| rx->key->conf.alg != ALG_TKIP \|\|
c34498b9 HH	99	!ieee80211_has_protected(hdr->frame_control) \|\|
c34498b9 HH	100	!ieee80211_is_data_present(hdr->frame_control))
9ae54c84	101	return RX_CONTINUE;
f0706e82	102
8e8862b7 HH	103	hdrlen = ieee80211_hdrlen(hdr->frame_control);
8e8862b7 HH	104	if (skb->len < hdrlen + MICHAEL_MIC_LEN)
e4c26add	105	return RX_DROP_UNUSABLE;
f0706e82	106
8e8862b7 HH	107	data = skb->data + hdrlen;
8e8862b7 HH	108	data_len = skb->len - hdrlen - MICHAEL_MIC_LEN;
f0706e82 JB	109
	110	#if 0
	111	authenticator = fc & IEEE80211_FCTL_TODS; /* FIX */
	112	#else
	113	authenticator = 1;
	114	#endif
ffd7891d LR	115	key_offset = authenticator ?
	116	NL80211_TKIP_DATA_OFFSET_RX_MIC_KEY :
	117	NL80211_TKIP_DATA_OFFSET_TX_MIC_KEY;
	118	key = &rx->key->conf.key[key_offset];
8e8862b7	119	michael_mic(key, hdr, data, data_len, mic);
f0706e82	120	if (memcmp(mic, data + data_len, MICHAEL_MIC_LEN) != 0 \|\| wpa_test) {
5cf121c3	121	if (!(rx->flags & IEEE80211_RX_RA_MATCH))
e4c26add	122	return RX_DROP_UNUSABLE;
f0706e82	123
f698d856	124	mac80211_ev_michael_mic_failure(rx->sdata, rx->key->conf.keyidx,
e6d6e342 JB	125	(void *) skb->data, NULL,
e6d6e342 JB	126	GFP_ATOMIC);
e4c26add	127	return RX_DROP_UNUSABLE;
f0706e82 JB	128	}
f0706e82 JB	129
f0706e82 JB	130	/* remove Michael MIC from payload */
	131	skb_trim(skb, skb->len - MICHAEL_MIC_LEN);
	132
50741ae0	133	/* update IV in key information to be able to detect replays */
b0f76b33 HH	134	rx->key->u.tkip.rx[rx->queue].iv32 = rx->tkip_iv32;
b0f76b33 HH	135	rx->key->u.tkip.rx[rx->queue].iv16 = rx->tkip_iv16;
50741ae0	136
9ae54c84	137	return RX_CONTINUE;
f0706e82 JB	138	}
	139
	140
e039fa4a	141	static int tkip_encrypt_skb(struct ieee80211_tx_data tx, struct sk_buff skb)
f0706e82 JB	142	{
	143	struct ieee80211_hdr hdr = (struct ieee80211_hdr ) skb->data;
	144	struct ieee80211_key *key = tx->key;
e039fa4a	145	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
d5184cac HH	146	unsigned int hdrlen;
d5184cac HH	147	int len, tail;
f0706e82 JB	148	u8 *pos;
f0706e82 JB	149
e039fa4a JB	150	if ((tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) &&
	151	!(tx->key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV)) {
	152	/* hwaccel - with no need for preallocated room for IV/ICV */
	153	info->control.hw_key = &tx->key->conf;
23c0752a	154	return 0;
e039fa4a JB	155	}
e039fa4a JB	156
d5184cac	157	hdrlen = ieee80211_hdrlen(hdr->frame_control);
f0706e82 JB	158	len = skb->len - hdrlen;
f0706e82 JB	159
11a843b7	160	if (tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)
23c0752a	161	tail = 0;
11a843b7	162	else
23c0752a JB	163	tail = TKIP_ICV_LEN;
	164
	165	if (WARN_ON(skb_tailroom(skb) < tail \|\|
	166	skb_headroom(skb) < TKIP_IV_LEN))
	167	return -1;
f0706e82 JB	168
	169	pos = skb_push(skb, TKIP_IV_LEN);
	170	memmove(pos, pos + TKIP_IV_LEN, hdrlen);
	171	pos += hdrlen;
	172
	173	/* Increase IV for the frame */
b0f76b33 HH	174	key->u.tkip.tx.iv16++;
	175	if (key->u.tkip.tx.iv16 == 0)
	176	key->u.tkip.tx.iv32++;
f0706e82	177
11a843b7	178	if (tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) {
f0706e82	179	/* hwaccel - with preallocated room for IV */
c801242c	180	ieee80211_tkip_add_iv(pos, key, key->u.tkip.tx.iv16);
f0706e82	181
e039fa4a	182	info->control.hw_key = &tx->key->conf;
f0706e82 JB	183	return 0;
	184	}
	185
	186	/* Add room for ICV */
	187	skb_put(skb, TKIP_ICV_LEN);
	188
	189	hdr = (struct ieee80211_hdr *) skb->data;
	190	ieee80211_tkip_encrypt_data(tx->local->wep_tx_tfm,
	191	key, pos, len, hdr->addr2);
	192	return 0;
	193	}
	194
	195
9ae54c84	196	ieee80211_tx_result
5cf121c3	197	ieee80211_crypto_tkip_encrypt(struct ieee80211_tx_data *tx)
f0706e82	198	{
f0706e82	199	struct sk_buff *skb = tx->skb;
f0706e82	200
5cf121c3	201	ieee80211_tx_set_protected(tx);
f0706e82	202
2de8e0d9 JB	203	do {
	204	if (tkip_encrypt_skb(tx, skb) < 0)
	205	return TX_DROP;
	206	} while ((skb = skb->next));
f0706e82	207
9ae54c84	208	return TX_CONTINUE;
f0706e82 JB	209	}
	210
	211
9ae54c84	212	ieee80211_rx_result
5cf121c3	213	ieee80211_crypto_tkip_decrypt(struct ieee80211_rx_data *rx)
f0706e82 JB	214	{
f0706e82 JB	215	struct ieee80211_hdr hdr = (struct ieee80211_hdr ) rx->skb->data;
f0706e82 JB	216	int hdrlen, res, hwaccel = 0, wpa_test = 0;
	217	struct ieee80211_key *key = rx->key;
	218	struct sk_buff *skb = rx->skb;
	219
d5184cac	220	hdrlen = ieee80211_hdrlen(hdr->frame_control);
f0706e82	221
c34498b9	222	if (!ieee80211_is_data(hdr->frame_control))
9ae54c84	223	return RX_CONTINUE;
f0706e82 JB	224
f0706e82 JB	225	if (!rx->sta \|\| skb->len - hdrlen < 12)
e4c26add	226	return RX_DROP_UNUSABLE;
f0706e82	227
5cf121c3 JB	228	if (rx->status->flag & RX_FLAG_DECRYPTED) {
5cf121c3 JB	229	if (rx->status->flag & RX_FLAG_IV_STRIPPED) {
7848ba7d JB	230	/*
	231	* Hardware took care of all processing, including
	232	* replay protection, and stripped the ICV/IV so
	233	* we cannot do any checks here.
	234	*/
9ae54c84	235	return RX_CONTINUE;
f0706e82 JB	236	}
	237
	238	/* let TKIP code verify IV, but skip decryption */
	239	hwaccel = 1;
	240	}
	241
	242	res = ieee80211_tkip_decrypt_data(rx->local->wep_rx_tfm,
	243	key, skb->data + hdrlen,
17741cdc	244	skb->len - hdrlen, rx->sta->sta.addr,
9ae4fda3	245	hdr->addr1, hwaccel, rx->queue,
5cf121c3 JB	246	&rx->tkip_iv32,
5cf121c3 JB	247	&rx->tkip_iv16);
f4ea83dd	248	if (res != TKIP_DECRYPT_OK \|\| wpa_test)
e4c26add	249	return RX_DROP_UNUSABLE;
f0706e82 JB	250
	251	/* Trim ICV */
	252	skb_trim(skb, skb->len - TKIP_ICV_LEN);
	253
	254	/* Remove IV */
	255	memmove(skb->data + TKIP_IV_LEN, skb->data, hdrlen);
	256	skb_pull(skb, TKIP_IV_LEN);
	257
9ae54c84	258	return RX_CONTINUE;
f0706e82 JB	259	}
	260
	261
feccb466	262	static void ccmp_special_blocks(struct sk_buff skb, u8 pn, u8 *scratch,
f0706e82 JB	263	int encrypted)
f0706e82 JB	264	{
f14df804	265	__le16 mask_fc;
fb733336	266	int a4_included, mgmt;
f14df804	267	u8 qos_tid;
feccb466	268	u8 b_0, aad;
f14df804 HH	269	u16 data_len, len_a;
	270	unsigned int hdrlen;
	271	struct ieee80211_hdr hdr = (struct ieee80211_hdr )skb->data;
f0706e82	272
feccb466 HH	273	b_0 = scratch + 3 * AES_BLOCK_LEN;
	274	aad = scratch + 4 * AES_BLOCK_LEN;
	275
f14df804	276	/*
fb733336	277	* Mask FC: zero subtype b4 b5 b6 (if not mgmt)
f14df804 HH	278	* Retry, PwrMgt, MoreData; set Protected
f14df804 HH	279	*/
fb733336	280	mgmt = ieee80211_is_mgmt(hdr->frame_control);
f14df804	281	mask_fc = hdr->frame_control;
fb733336	282	mask_fc &= ~cpu_to_le16(IEEE80211_FCTL_RETRY \|
f14df804	283	IEEE80211_FCTL_PM \| IEEE80211_FCTL_MOREDATA);
fb733336 JM	284	if (!mgmt)
fb733336 JM	285	mask_fc &= ~cpu_to_le16(0x0070);
f14df804 HH	286	mask_fc \|= cpu_to_le16(IEEE80211_FCTL_PROTECTED);
	287
	288	hdrlen = ieee80211_hdrlen(hdr->frame_control);
	289	len_a = hdrlen - 2;
	290	a4_included = ieee80211_has_a4(hdr->frame_control);
f0706e82	291
f14df804 HH	292	if (ieee80211_is_data_qos(hdr->frame_control))
	293	qos_tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
	294	else
	295	qos_tid = 0;
	296
	297	data_len = skb->len - hdrlen - CCMP_HDR_LEN;
	298	if (encrypted)
	299	data_len -= CCMP_MIC_LEN;
	300
	301	/* First block, b_0 */
f0706e82	302	b_0[0] = 0x59; /* flags: Adata: 1, M: 011, L: 001 */
fb733336 JM	303	/* Nonce: Nonce Flags \| A2 \| PN
	304	* Nonce Flags: Priority (b0..b3) \| Management (b4) \| Reserved (b5..b7)
	305	*/
	306	b_0[1] = qos_tid \| (mgmt << 4);
73e1f7c8	307	memcpy(&b_0[2], hdr->addr2, ETH_ALEN);
f0706e82 JB	308	memcpy(&b_0[8], pn, CCMP_PN_LEN);
f0706e82 JB	309	/* l(m) */
f14df804	310	put_unaligned_be16(data_len, &b_0[14]);
f0706e82 JB	311
	312	/* AAD (extra authenticate-only data) / masked 802.11 header
	313	* FC \| A1 \| A2 \| A3 \| SC \| [A4] \| [QC] */
f14df804 HH	314	put_unaligned_be16(len_a, &aad[0]);
f14df804 HH	315	put_unaligned(mask_fc, (__le16 *)&aad[2]);
73e1f7c8	316	memcpy(&aad[4], &hdr->addr1, 3 * ETH_ALEN);
f0706e82 JB	317
	318	/* Mask Seq#, leave Frag# */
	319	aad[22] = ((u8 ) &hdr->seq_ctrl) & 0x0f;
	320	aad[23] = 0;
f14df804	321
f0706e82	322	if (a4_included) {
73e1f7c8	323	memcpy(&aad[24], hdr->addr4, ETH_ALEN);
f14df804	324	aad[30] = qos_tid;
f0706e82	325	aad[31] = 0;
f14df804	326	} else {
73e1f7c8	327	memset(&aad[24], 0, ETH_ALEN + IEEE80211_QOS_CTL_LEN);
f14df804	328	aad[24] = qos_tid;
f0706e82 JB	329	}
	330	}
	331
	332
	333	static inline void ccmp_pn2hdr(u8 hdr, u8 pn, int key_id)
	334	{
	335	hdr[0] = pn[5];
	336	hdr[1] = pn[4];
	337	hdr[2] = 0;
	338	hdr[3] = 0x20 \| (key_id << 6);
	339	hdr[4] = pn[3];
	340	hdr[5] = pn[2];
	341	hdr[6] = pn[1];
	342	hdr[7] = pn[0];
	343	}
	344
	345
c6a1fa12	346	static inline void ccmp_hdr2pn(u8 pn, u8 hdr)
f0706e82 JB	347	{
	348	pn[0] = hdr[7];
	349	pn[1] = hdr[6];
	350	pn[2] = hdr[5];
	351	pn[3] = hdr[4];
	352	pn[4] = hdr[1];
	353	pn[5] = hdr[0];
f0706e82 JB	354	}
	355
	356
e039fa4a	357	static int ccmp_encrypt_skb(struct ieee80211_tx_data tx, struct sk_buff skb)
f0706e82 JB	358	{
	359	struct ieee80211_hdr hdr = (struct ieee80211_hdr ) skb->data;
	360	struct ieee80211_key *key = tx->key;
e039fa4a	361	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
23c0752a	362	int hdrlen, len, tail;
feccb466	363	u8 pos, pn;
f0706e82	364	int i;
1f7d77ab JM	365	bool skip_hw;
	366
	367	skip_hw = (tx->key->conf.flags & IEEE80211_KEY_FLAG_SW_MGMT) &&
	368	ieee80211_is_mgmt(hdr->frame_control);
f0706e82	369
e039fa4a	370	if ((tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) &&
1f7d77ab JM	371	!(tx->key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_IV) &&
1f7d77ab JM	372	!skip_hw) {
c6a1fa12	373	/* hwaccel - with no need for preallocated room for CCMP
e039fa4a JB	374	* header or MIC fields */
e039fa4a JB	375	info->control.hw_key = &tx->key->conf;
23c0752a	376	return 0;
e039fa4a JB	377	}
e039fa4a JB	378
d5184cac	379	hdrlen = ieee80211_hdrlen(hdr->frame_control);
f0706e82 JB	380	len = skb->len - hdrlen;
f0706e82 JB	381
11a843b7	382	if (key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE)
23c0752a	383	tail = 0;
11a843b7	384	else
23c0752a JB	385	tail = CCMP_MIC_LEN;
	386
	387	if (WARN_ON(skb_tailroom(skb) < tail \|\|
	388	skb_headroom(skb) < CCMP_HDR_LEN))
	389	return -1;
f0706e82 JB	390
	391	pos = skb_push(skb, CCMP_HDR_LEN);
	392	memmove(pos, pos + CCMP_HDR_LEN, hdrlen);
	393	hdr = (struct ieee80211_hdr *) pos;
	394	pos += hdrlen;
	395
	396	/* PN = PN + 1 */
	397	pn = key->u.ccmp.tx_pn;
	398
	399	for (i = CCMP_PN_LEN - 1; i >= 0; i--) {
	400	pn[i]++;
	401	if (pn[i])
	402	break;
	403	}
	404
8f20fc24	405	ccmp_pn2hdr(pos, pn, key->conf.keyidx);
f0706e82	406
1f7d77ab	407	if ((key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) && !skip_hw) {
f0706e82	408	/* hwaccel - with preallocated room for CCMP header */
e039fa4a	409	info->control.hw_key = &tx->key->conf;
f0706e82 JB	410	return 0;
	411	}
	412
	413	pos += CCMP_HDR_LEN;
feccb466 HH	414	ccmp_special_blocks(skb, pn, key->u.ccmp.tx_crypto_buf, 0);
feccb466 HH	415	ieee80211_aes_ccm_encrypt(key->u.ccmp.tfm, key->u.ccmp.tx_crypto_buf, pos, len,
f0706e82 JB	416	pos, skb_put(skb, CCMP_MIC_LEN));
	417
	418	return 0;
	419	}
	420
	421
9ae54c84	422	ieee80211_tx_result
5cf121c3	423	ieee80211_crypto_ccmp_encrypt(struct ieee80211_tx_data *tx)
f0706e82	424	{
f0706e82	425	struct sk_buff *skb = tx->skb;
f0706e82	426
5cf121c3	427	ieee80211_tx_set_protected(tx);
f0706e82	428
2de8e0d9 JB	429	do {
	430	if (ccmp_encrypt_skb(tx, skb) < 0)
	431	return TX_DROP;
	432	} while ((skb = skb->next));
f0706e82	433
9ae54c84	434	return TX_CONTINUE;
f0706e82 JB	435	}
	436
	437
9ae54c84	438	ieee80211_rx_result
5cf121c3	439	ieee80211_crypto_ccmp_decrypt(struct ieee80211_rx_data *rx)
f0706e82	440	{
c34498b9	441	struct ieee80211_hdr hdr = (struct ieee80211_hdr )rx->skb->data;
f0706e82 JB	442	int hdrlen;
	443	struct ieee80211_key *key = rx->key;
	444	struct sk_buff *skb = rx->skb;
	445	u8 pn[CCMP_PN_LEN];
	446	int data_len;
	447
d5184cac	448	hdrlen = ieee80211_hdrlen(hdr->frame_control);
f0706e82	449
fb733336 JM	450	if (!ieee80211_is_data(hdr->frame_control) &&
fb733336 JM	451	!ieee80211_is_robust_mgmt_frame(hdr))
9ae54c84	452	return RX_CONTINUE;
f0706e82 JB	453
	454	data_len = skb->len - hdrlen - CCMP_HDR_LEN - CCMP_MIC_LEN;
	455	if (!rx->sta \|\| data_len < 0)
e4c26add	456	return RX_DROP_UNUSABLE;
f0706e82	457
5cf121c3 JB	458	if ((rx->status->flag & RX_FLAG_DECRYPTED) &&
5cf121c3 JB	459	(rx->status->flag & RX_FLAG_IV_STRIPPED))
9ae54c84	460	return RX_CONTINUE;
f0706e82	461
c6a1fa12	462	ccmp_hdr2pn(pn, skb->data + hdrlen);
f0706e82	463
5cf121c3	464	if (memcmp(pn, key->u.ccmp.rx_pn[rx->queue], CCMP_PN_LEN) <= 0) {
f0706e82	465	key->u.ccmp.replays++;
e4c26add	466	return RX_DROP_UNUSABLE;
f0706e82 JB	467	}
f0706e82 JB	468
5cf121c3	469	if (!(rx->status->flag & RX_FLAG_DECRYPTED)) {
7848ba7d	470	/* hardware didn't decrypt/verify MIC */
feccb466	471	ccmp_special_blocks(skb, pn, key->u.ccmp.rx_crypto_buf, 1);
f0706e82 JB	472
f0706e82 JB	473	if (ieee80211_aes_ccm_decrypt(
feccb466	474	key->u.ccmp.tfm, key->u.ccmp.rx_crypto_buf,
f0706e82 JB	475	skb->data + hdrlen + CCMP_HDR_LEN, data_len,
f0706e82 JB	476	skb->data + skb->len - CCMP_MIC_LEN,
c6a1fa12	477	skb->data + hdrlen + CCMP_HDR_LEN))
e4c26add	478	return RX_DROP_UNUSABLE;
f0706e82 JB	479	}
f0706e82 JB	480
5cf121c3	481	memcpy(key->u.ccmp.rx_pn[rx->queue], pn, CCMP_PN_LEN);
f0706e82 JB	482
	483	/* Remove CCMP header and MIC */
	484	skb_trim(skb, skb->len - CCMP_MIC_LEN);
	485	memmove(skb->data + CCMP_HDR_LEN, skb->data, hdrlen);
	486	skb_pull(skb, CCMP_HDR_LEN);
	487
9ae54c84	488	return RX_CONTINUE;
f0706e82	489	}
765cb46a JM	490
	491
	492	static void bip_aad(struct sk_buff skb, u8 aad)
	493	{
	494	/* BIP AAD: FC(masked) \|\| A1 \|\| A2 \|\| A3 */
	495
	496	/* FC type/subtype */
	497	aad[0] = skb->data[0];
	498	/* Mask FC Retry, PwrMgt, MoreData flags to zero */
	499	aad[1] = skb->data[1] & ~(BIT(4) \| BIT(5) \| BIT(6));
	500	/* A1 \|\| A2 \|\| A3 */
	501	memcpy(aad + 2, skb->data + 4, 3 * ETH_ALEN);
	502	}
	503
	504
	505	static inline void bip_ipn_swap(u8 d, const u8 s)
	506	{
	507	*d++ = s[5];
	508	*d++ = s[4];
	509	*d++ = s[3];
	510	*d++ = s[2];
	511	*d++ = s[1];
	512	*d = s[0];
	513	}
	514
	515
	516	ieee80211_tx_result
	517	ieee80211_crypto_aes_cmac_encrypt(struct ieee80211_tx_data *tx)
	518	{
	519	struct sk_buff *skb = tx->skb;
	520	struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
	521	struct ieee80211_key *key = tx->key;
	522	struct ieee80211_mmie *mmie;
	523	u8 *pn, aad[20];
	524	int i;
	525
	526	if (tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) {
	527	/* hwaccel */
	528	info->control.hw_key = &tx->key->conf;
	529	return 0;
	530	}
	531
	532	if (WARN_ON(skb_tailroom(skb) < sizeof(*mmie)))
	533	return TX_DROP;
	534
	535	mmie = (struct ieee80211_mmie ) skb_put(skb, sizeof(mmie));
	536	mmie->element_id = WLAN_EID_MMIE;
	537	mmie->length = sizeof(*mmie) - 2;
	538	mmie->key_id = cpu_to_le16(key->conf.keyidx);
	539
	540	/* PN = PN + 1 */
	541	pn = key->u.aes_cmac.tx_pn;
	542
	543	for (i = sizeof(key->u.aes_cmac.tx_pn) - 1; i >= 0; i--) {
	544	pn[i]++;
	545	if (pn[i])
	546	break;
	547	}
	548	bip_ipn_swap(mmie->sequence_number, pn);
	549
	550	bip_aad(skb, aad);
	551
	552	/*
	553	* MIC = AES-128-CMAC(IGTK, AAD \|\| Management Frame Body \|\| MMIE, 64)
554	*/
555	ieee80211_aes_cmac(key->u.aes_cmac.tfm, key->u.aes_cmac.tx_crypto_buf,
556	aad, skb->data + 24, skb->len - 24, mmie->mic);
557
558	return TX_CONTINUE;
559	}
560
561
562	ieee80211_rx_result
563	ieee80211_crypto_aes_cmac_decrypt(struct ieee80211_rx_data *rx)
564	{
565	struct sk_buff *skb = rx->skb;
566	struct ieee80211_key *key = rx->key;
567	struct ieee80211_mmie *mmie;
568	u8 aad[20], mic[8], ipn[6];
569	struct ieee80211_hdr hdr = (struct ieee80211_hdr ) skb->data;
570
571	if (!ieee80211_is_mgmt(hdr->frame_control))
572	return RX_CONTINUE;
573
574	if ((rx->status->flag & RX_FLAG_DECRYPTED) &&
575	(rx->status->flag & RX_FLAG_IV_STRIPPED))
576	return RX_CONTINUE;
577
578	if (skb->len < 24 + sizeof(*mmie))
579	return RX_DROP_UNUSABLE;
580
581	mmie = (struct ieee80211_mmie *)
582	(skb->data + skb->len - sizeof(*mmie));
583	if (mmie->element_id != WLAN_EID_MMIE \|\|
584	mmie->length != sizeof(*mmie) - 2)
585	return RX_DROP_UNUSABLE; /* Invalid MMIE */
586
587	bip_ipn_swap(ipn, mmie->sequence_number);
588
589	if (memcmp(ipn, key->u.aes_cmac.rx_pn, 6) <= 0) {
590	key->u.aes_cmac.replays++;
591	return RX_DROP_UNUSABLE;
592	}
593
594	if (!(rx->status->flag & RX_FLAG_DECRYPTED)) {
595	/* hardware didn't decrypt/verify MIC */
596	bip_aad(skb, aad);
597	ieee80211_aes_cmac(key->u.aes_cmac.tfm,
598	key->u.aes_cmac.rx_crypto_buf, aad,
599	skb->data + 24, skb->len - 24, mic);
600	if (memcmp(mic, mmie->mic, sizeof(mmie->mic)) != 0) {
601	key->u.aes_cmac.icverrors++;
602	return RX_DROP_UNUSABLE;
603	}
604	}
605
606	memcpy(key->u.aes_cmac.rx_pn, ipn, 6);
607
608	/* Remove MMIE */
609	skb_trim(skb, skb->len - sizeof(*mmie));
610
611	return RX_CONTINUE;
612	}