/*
* 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
#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"
-static int ieee80211_get_hdr_info(const struct sk_buff *skb, u8 **sa, u8 **da,
- u8 *qos_tid, u8 **data, size_t *data_len)
+ieee80211_tx_result
+ieee80211_tx_h_michael_mic_add(struct ieee80211_tx_data *tx)
{
- 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;
+ u8 *data, *key, *mic, key_offset;
size_t data_len;
- u16 fc;
+ unsigned int hdrlen;
+ struct ieee80211_hdr *hdr;
struct sk_buff *skb = tx->skb;
int authenticator;
int wpa_test = 0;
+ int tail;
- fc = tx->fc;
-
+ hdr = (struct ieee80211_hdr *)skb->data;
if (!tx->key || tx->key->conf.alg != ALG_TKIP || skb->len < 24 ||
- !WLAN_FC_DATA_PRESENT(fc))
- return TXRX_CONTINUE;
+ !ieee80211_is_data_present(hdr->frame_control))
+ return TX_CONTINUE;
+
+ hdrlen = ieee80211_hdrlen(hdr->frame_control);
+ if (skb->len < hdrlen)
+ return TX_DROP;
- if (ieee80211_get_hdr_info(skb, &sa, &da, &qos_tid, &data, &data_len))
- return TXRX_DROP;
+ data = skb->data + hdrlen;
+ data_len = skb->len - hdrlen;
if ((tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) &&
- !(tx->flags & IEEE80211_TXRXD_FRAGMENTED) &&
+ !(tx->flags & IEEE80211_TX_FRAGMENTED) &&
!(tx->key->conf.flags & IEEE80211_KEY_FLAG_GENERATE_MMIC) &&
!wpa_test) {
- /* hwaccel - with no need for preallocated room for Michael MIC
- */
- return TXRX_CONTINUE;
+ /* hwaccel - with no need for preallocated room for MMIC */
+ 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 TXRX_DROP;
- }
- }
+ tail = MICHAEL_MIC_LEN;
+ if (!(tx->key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE))
+ tail += TKIP_ICV_LEN;
+
+ if (WARN_ON(skb_tailroom(skb) < tail ||
+ skb_headroom(skb) < TKIP_IV_LEN))
+ return TX_DROP;
#if 0
authenticator = fc & IEEE80211_FCTL_FROMDS; /* FIX */
#else
authenticator = 1;
#endif
- key = &tx->key->conf.key[authenticator ? ALG_TKIP_TEMP_AUTH_TX_MIC_KEY :
- ALG_TKIP_TEMP_AUTH_RX_MIC_KEY];
+ 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, da, sa, qos_tid & 0x0f, data, data_len, mic);
+ michael_mic(key, hdr, data, data_len, mic);
- return TXRX_CONTINUE;
+ return TX_CONTINUE;
}
-ieee80211_txrx_result
-ieee80211_rx_h_michael_mic_verify(struct ieee80211_txrx_data *rx)
+ieee80211_rx_result
+ieee80211_rx_h_michael_mic_verify(struct ieee80211_rx_data *rx)
{
- u8 *data, *sa, *da, *key = NULL, qos_tid;
+ u8 *data, *key = NULL, key_offset;
size_t data_len;
- u16 fc;
+ unsigned int hdrlen;
+ struct ieee80211_hdr *hdr;
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 TXRX_CONTINUE;
+ /* 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 ||
- !(rx->fc & IEEE80211_FCTL_PROTECTED) || !WLAN_FC_DATA_PRESENT(fc))
- return TXRX_CONTINUE;
+ !ieee80211_has_protected(hdr->frame_control) ||
+ !ieee80211_is_data_present(hdr->frame_control))
+ return RX_CONTINUE;
- if (ieee80211_get_hdr_info(skb, &sa, &da, &qos_tid, &data, &data_len)
- || data_len < MICHAEL_MIC_LEN)
- return TXRX_DROP;
+ hdrlen = ieee80211_hdrlen(hdr->frame_control);
+ if (skb->len < hdrlen + MICHAEL_MIC_LEN)
+ return RX_DROP_UNUSABLE;
- data_len -= MICHAEL_MIC_LEN;
+ 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 = &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);
+ 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_TXRXD_RXRA_MATCH))
- return TXRX_DROP;
+ if (!(rx->flags & IEEE80211_RX_RA_MATCH))
+ return RX_DROP_UNUSABLE;
- printk(KERN_DEBUG "%s: invalid Michael MIC in data frame from "
- "%s\n", rx->dev->name, print_mac(mac, sa));
-
- mac80211_ev_michael_mic_failure(rx->dev, rx->key->conf.keyidx,
- (void *) skb->data);
- return TXRX_DROP;
+ 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);
- return TXRX_CONTINUE;
+ /* 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_txrx_data *tx,
- struct sk_buff *skb, int test)
+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;
- int hdrlen, len, tailneed;
- u16 fc;
+ struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
+ unsigned int hdrlen;
+ int len, tail;
u8 *pos;
- fc = le16_to_cpu(hdr->frame_control);
- hdrlen = ieee80211_get_hdrlen(fc);
+ 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)
- tailneed = 0;
+ tail = 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;
- }
+ 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.iv16++;
- if (key->u.tkip.iv16 == 0)
- key->u.tkip.iv32++;
+ 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) {
- 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);
+ ieee80211_tkip_add_iv(pos, key, key->u.tkip.tx.iv16);
- tx->u.tx.control->key_idx = tx->key->conf.hw_key_idx;
+ info->control.hw_key = &tx->key->conf;
return 0;
}
}
-ieee80211_txrx_result
-ieee80211_tx_h_tkip_encrypt(struct ieee80211_txrx_data *tx)
+ieee80211_tx_result
+ieee80211_crypto_tkip_encrypt(struct ieee80211_tx_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;
- }
+ ieee80211_tx_set_protected(tx);
- if (tkip_encrypt_skb(tx, skb, test) < 0)
- return TXRX_DROP;
+ do {
+ if (tkip_encrypt_skb(tx, skb) < 0)
+ return TX_DROP;
+ } while ((skb = skb->next));
- 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;
+ return TX_CONTINUE;
}
-ieee80211_txrx_result
-ieee80211_rx_h_tkip_decrypt(struct ieee80211_txrx_data *rx)
+ieee80211_rx_result
+ieee80211_crypto_tkip_decrypt(struct ieee80211_rx_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);
+ hdrlen = ieee80211_hdrlen(hdr->frame_control);
- 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 (!ieee80211_is_data(hdr->frame_control))
+ return RX_CONTINUE;
if (!rx->sta || skb->len - hdrlen < 12)
- return TXRX_DROP;
+ return RX_DROP_UNUSABLE;
- if (rx->u.rx.status->flag & RX_FLAG_DECRYPTED) {
- if (rx->u.rx.status->flag & RX_FLAG_IV_STRIPPED) {
+ 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 TXRX_CONTINUE;
+ return RX_CONTINUE;
}
/* let TKIP code verify IV, but skip decryption */
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 "
- "%s (res=%d)\n",
- rx->dev->name, print_mac(mac, rx->sta->addr), res);
- return TXRX_DROP;
- }
+ 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);
memmove(skb->data + TKIP_IV_LEN, skb->data, hdrlen);
skb_pull(skb, TKIP_IV_LEN);
- return TXRX_CONTINUE;
+ return RX_CONTINUE;
}
-static void ccmp_special_blocks(struct sk_buff *skb, u8 *pn, u8 *b_0, u8 *aad,
+static void ccmp_special_blocks(struct sk_buff *skb, u8 *pn, u8 *scratch,
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;
+ __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;
- 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 = 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: QoS Priority | A2 | PN */
- b_0[1] = qos_tid;
- memcpy(&b_0[2], hdr->addr2, 6);
+ /* 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) */
- b_0[14] = (data_len >> 8) & 0xff;
- b_0[15] = data_len & 0xff;
-
+ put_unaligned_be16(data_len, &b_0[14]);
/* 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);
+ 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, 6);
- aad[30] = 0;
+ memcpy(&aad[24], hdr->addr4, ETH_ALEN);
+ aad[30] = qos_tid;
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;
+ } else {
+ memset(&aad[24], 0, ETH_ALEN + IEEE80211_QOS_CTL_LEN);
+ aad[24] = qos_tid;
}
}
}
-static inline int ccmp_hdr2pn(u8 *pn, u8 *hdr)
+static inline void ccmp_hdr2pn(u8 *pn, u8 *hdr)
{
pn[0] = hdr[7];
pn[1] = hdr[6];
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)
+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;
- int hdrlen, len, tailneed;
- u16 fc;
- u8 *pos, *pn, *b_0, *aad, *scratch;
+ struct ieee80211_tx_info *info = IEEE80211_SKB_CB(skb);
+ int hdrlen, len, tail;
+ u8 *pos, *pn;
int i;
+ bool skip_hw;
- scratch = key->u.ccmp.tx_crypto_buf;
- b_0 = scratch + 3 * AES_BLOCK_LEN;
- aad = scratch + 4 * AES_BLOCK_LEN;
+ skip_hw = (tx->key->conf.flags & IEEE80211_KEY_FLAG_SW_MGMT) &&
+ ieee80211_is_mgmt(hdr->frame_control);
- fc = le16_to_cpu(hdr->frame_control);
- hdrlen = ieee80211_get_hdrlen(fc);
+ 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)
- tailneed = 0;
+ tail = 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;
- }
+ 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);
ccmp_pn2hdr(pos, pn, key->conf.keyidx);
- if (key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) {
+ if ((key->flags & KEY_FLAG_UPLOADED_TO_HARDWARE) && !skip_hw) {
/* hwaccel - with preallocated room for CCMP header */
- tx->u.tx.control->key_idx = key->conf.hw_key_idx;
+ info->control.hw_key = &tx->key->conf;
return 0;
}
pos += CCMP_HDR_LEN;
- ccmp_special_blocks(skb, pn, b_0, aad, 0);
- ieee80211_aes_ccm_encrypt(key->u.ccmp.tfm, scratch, b_0, aad, pos, len,
+ 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_txrx_result
-ieee80211_tx_h_ccmp_encrypt(struct ieee80211_txrx_data *tx)
+ieee80211_tx_result
+ieee80211_crypto_ccmp_encrypt(struct ieee80211_tx_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;
+ ieee80211_tx_set_protected(tx);
- 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;
- }
- }
+ do {
+ if (ccmp_encrypt_skb(tx, skb) < 0)
+ return TX_DROP;
+ } while ((skb = skb->next));
- return TXRX_CONTINUE;
+ return TX_CONTINUE;
}
-ieee80211_txrx_result
-ieee80211_rx_h_ccmp_decrypt(struct ieee80211_txrx_data *rx)
+ieee80211_rx_result
+ieee80211_crypto_ccmp_decrypt(struct ieee80211_rx_data *rx)
{
- struct ieee80211_hdr *hdr = (struct ieee80211_hdr *) rx->skb->data;
- u16 fc;
+ struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)rx->skb->data;
int hdrlen;
struct ieee80211_key *key = rx->key;
struct sk_buff *skb = rx->skb;
u8 pn[CCMP_PN_LEN];
int data_len;
- DECLARE_MAC_BUF(mac);
- fc = le16_to_cpu(hdr->frame_control);
- hdrlen = ieee80211_get_hdrlen(fc);
+ hdrlen = ieee80211_hdrlen(hdr->frame_control);
- if (!key || key->conf.alg != ALG_CCMP ||
- !(rx->fc & IEEE80211_FCTL_PROTECTED) ||
- (rx->fc & IEEE80211_FCTL_FTYPE) != IEEE80211_FTYPE_DATA)
- return TXRX_CONTINUE;
+ 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 TXRX_DROP;
-
- if ((rx->u.rx.status->flag & RX_FLAG_DECRYPTED) &&
- (rx->u.rx.status->flag & RX_FLAG_IV_STRIPPED))
- return TXRX_CONTINUE;
+ return RX_DROP_UNUSABLE;
- (void) ccmp_hdr2pn(pn, skb->data + hdrlen);
+ if ((rx->status->flag & RX_FLAG_DECRYPTED) &&
+ (rx->status->flag & RX_FLAG_IV_STRIPPED))
+ return RX_CONTINUE;
- 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];
+ ccmp_hdr2pn(pn, skb->data + hdrlen);
- 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 */
+ if (memcmp(pn, key->u.ccmp.rx_pn[rx->queue], CCMP_PN_LEN) <= 0) {
key->u.ccmp.replays++;
- return TXRX_DROP;
+ return RX_DROP_UNUSABLE;
}
- if (!(rx->u.rx.status->flag & RX_FLAG_DECRYPTED)) {
+ if (!(rx->status->flag & RX_FLAG_DECRYPTED)) {
/* hardware didn't decrypt/verify MIC */
- u8 *scratch, *b_0, *aad;
-
- scratch = key->u.ccmp.rx_crypto_buf;
- b_0 = scratch + 3 * AES_BLOCK_LEN;
- aad = scratch + 4 * AES_BLOCK_LEN;
-
- ccmp_special_blocks(skb, pn, b_0, aad, 1);
+ ccmp_special_blocks(skb, pn, key->u.ccmp.rx_crypto_buf, 1);
if (ieee80211_aes_ccm_decrypt(
- key->u.ccmp.tfm, scratch, b_0, aad,
+ 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)) {
- printk(KERN_DEBUG "%s: CCMP decrypt failed for RX "
- "frame from %s\n", rx->dev->name,
- print_mac(mac, rx->sta->addr));
- return TXRX_DROP;
- }
+ skb->data + hdrlen + CCMP_HDR_LEN))
+ return RX_DROP_UNUSABLE;
}
- memcpy(key->u.ccmp.rx_pn[rx->u.rx.queue], pn, CCMP_PN_LEN);
+ 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 TXRX_CONTINUE;
+ 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;
}
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff