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mac80211: remove ieee80211_get_hdr_info

Browse source 
Do the check for sufficient skb->len explicitly and pass a pointer
to the struct ieee80211_hdr directly to the michael_mic calculation.

Signed-off-by: Harvey Harrison <harvey.harrison@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Harvey Harrison 2008-07-02 11:05:35 -07:00 committed by John W. Linville
parent f14df8049f
commit 8e8862b79d
3 changed files with 35 additions and 41 deletions
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20
net/mac80211/michael.c
View file

@ -8,6 +8,7 @@
*/
#include <linux/types.h>
#include <linux/bitops.h>
#include <linux/ieee80211.h>
#include <asm/unaligned.h>
#include "michael.h"
@ -26,9 +27,18 @@ static void michael_block(struct michael_mic_ctx *mctx, u32 val)
mctx->l += mctx->r;
}
static void michael_mic_hdr(struct michael_mic_ctx *mctx,
const u8 *key, const u8 *da, const u8 *sa, u8 priority)
static void michael_mic_hdr(struct michael_mic_ctx *mctx, const u8 *key,
struct ieee80211_hdr *hdr)
{
u8 *da, *sa, tid;
da = ieee80211_get_DA(hdr);
sa = ieee80211_get_SA(hdr);
if (ieee80211_is_data_qos(hdr->frame_control))
tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
else
tid = 0;
mctx->l = get_unaligned_le32(key);
mctx->r = get_unaligned_le32(key + 4);
@ -40,17 +50,17 @@ static void michael_mic_hdr(struct michael_mic_ctx *mctx,
michael_block(mctx, get_unaligned_le16(&da[4]) |
(get_unaligned_le16(sa) << 16));
michael_block(mctx, get_unaligned_le32(&sa[2]));
michael_block(mctx, priority);
michael_block(mctx, tid);
}
void michael_mic(const u8 *key, const u8 *da, const u8 *sa, u8 priority,
void michael_mic(const u8 *key, struct ieee80211_hdr *hdr,
const u8 *data, size_t data_len, u8 *mic)
{
u32 val;
size_t block, blocks, left;
struct michael_mic_ctx mctx;
michael_mic_hdr(&mctx, key, da, sa, priority);
michael_mic_hdr(&mctx, key, hdr);
/* Real data */
blocks = data_len / 4;

2
net/mac80211/michael.h
View file

@ -18,7 +18,7 @@ struct michael_mic_ctx {
u32 l, r;
};
void michael_mic(const u8 *key, const u8 *da, const u8 *sa, u8 priority,
void michael_mic(const u8 *key, struct ieee80211_hdr *hdr,
const u8 *data, size_t data_len, u8 *mic);
#endif /* MICHAEL_H */

54
net/mac80211/wpa.c
View file

@ -21,38 +21,13 @@
#include "aes_ccm.h"
#include "wpa.h"
static int ieee80211_get_hdr_info(const struct sk_buff *skb, u8 **sa, u8 **da,
u8 *qos_tid, u8 **data, size_t *data_len)
{
struct ieee80211_hdr *hdr;
size_t hdrlen;
__le16 fc;
hdr = (struct ieee80211_hdr *)skb->data;
fc = hdr->frame_control;
hdrlen = ieee80211_hdrlen(fc);
*sa = ieee80211_get_SA(hdr);
*da = ieee80211_get_DA(hdr);
*data = skb->data + hdrlen;
*data_len = skb->len - hdrlen;
if (ieee80211_is_data_qos(fc))
*qos_tid = (*ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK) | 0x80;
else
*qos_tid = 0;
return skb->len < hdrlen ? -1 : 0;
}
ieee80211_tx_result
ieee80211_tx_h_michael_mic_add(struct ieee80211_tx_data *tx)
{
u8 *data, *sa, *da, *key, *mic, qos_tid, key_offset;
u8 *data, *key, *mic, key_offset;
size_t data_len;
unsigned int hdrlen;
struct ieee80211_hdr *hdr;
u16 fc;
struct sk_buff *skb = tx->skb;
int authenticator;
@ -65,9 +40,14 @@ ieee80211_tx_h_michael_mic_add(struct ieee80211_tx_data *tx)
!WLAN_FC_DATA_PRESENT(fc))
return TX_CONTINUE;
if (ieee80211_get_hdr_info(skb, &sa, &da, &qos_tid, &data, &data_len))
hdr = (struct ieee80211_hdr *)skb->data;
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) &&
@ -97,7 +77,7 @@ ieee80211_tx_h_michael_mic_add(struct ieee80211_tx_data *tx)
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 TX_CONTINUE;
}
@ -106,8 +86,10 @@ ieee80211_tx_h_michael_mic_add(struct ieee80211_tx_data *tx)
ieee80211_rx_result
ieee80211_rx_h_michael_mic_verify(struct ieee80211_rx_data *rx)
{
u8 *data, *sa, *da, *key = NULL, qos_tid, key_offset;
u8 *data, *key = NULL, key_offset;
size_t data_len;
unsigned int hdrlen;
struct ieee80211_hdr *hdr;
u16 fc;
u8 mic[MICHAEL_MIC_LEN];
struct sk_buff *skb = rx->skb;
@ -126,11 +108,13 @@ ieee80211_rx_h_michael_mic_verify(struct ieee80211_rx_data *rx)
!(rx->fc & IEEE80211_FCTL_PROTECTED) || !WLAN_FC_DATA_PRESENT(fc))
return RX_CONTINUE;
if (ieee80211_get_hdr_info(skb, &sa, &da, &qos_tid, &data, &data_len)
|| data_len < MICHAEL_MIC_LEN)
hdr = (struct ieee80211_hdr *)skb->data;
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 */
@ -143,7 +127,7 @@ ieee80211_rx_h_michael_mic_verify(struct ieee80211_rx_data *rx)
NL80211_TKIP_DATA_OFFSET_RX_MIC_KEY :
NL80211_TKIP_DATA_OFFSET_TX_MIC_KEY;
key = &rx->key->conf.key[key_offset];
michael_mic(key, da, sa, qos_tid & 0x0f, data, data_len, mic);
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;