Root/drivers/staging/csr/data_tx.c

1/*
2 * ---------------------------------------------------------------------------
3 * FILE: data_tx.c
4 *
5 * PURPOSE:
6 * This file provides functions to send data requests to the UniFi.
7 *
8 * Copyright (C) 2007-2009 by Cambridge Silicon Radio Ltd.
9 *
10 * Refer to LICENSE.txt included with this source code for details on
11 * the license terms.
12 *
13 * ---------------------------------------------------------------------------
14 */
15#include "csr_wifi_hip_unifi.h"
16#include "unifi_priv.h"
17
18int
19uf_verify_m4(unifi_priv_t *priv, const unsigned char *packet, unsigned int length)
20{
21    const unsigned char *p = packet;
22    u16 keyinfo;
23
24
25    if (length < (4 + 5 + 8 + 32 + 16 + 8 + 8 + 16 + 1 + 8)) {
26        return 1;
27    }
28
29    p += 8;
30    keyinfo = p[5] << 8 | p[6]; /* big-endian */
31    if (
32          (p[0] == 1 || p[0] == 2) /* protocol version 802.1X-2001 (WPA) or -2004 (WPA2) */ &&
33          p[1] == 3 /* EAPOL-Key */ &&
34          /* don't bother checking p[2] p[3] (hh ll, packet body length) */
35          (p[4] == 254 || p[4] == 2) /* descriptor type P802.1i-D3.0 (WPA) or 802.11i-2004 (WPA2) */ &&
36          ((keyinfo & 0x0007) == 1 || (keyinfo & 0x0007) == 2) /* key descriptor version */ &&
37         (keyinfo & ~0x0207U) == 0x0108 && /* key info for 4/4 or 4/2 -- ignore key desc version and sec bit (since varies in WPA 4/4) */
38          (p[4 + 5 + 8 + 32 + 16 + 8 + 8 + 16 + 0] == 0 && /* key data length (2 octets) 0 for 4/4 only */
39           p[4 + 5 + 8 + 32 + 16 + 8 + 8 + 16 + 1] == 0)
40        ) {
41        unifi_trace(priv, UDBG1, "uf_verify_m4: M4 detected \n");
42        return 0;
43    }
44    else
45    {
46        return 1;
47    }
48}
49
50/*
51 * ---------------------------------------------------------------------------
52 *
53 * Data transport signals.
54 *
55 * ---------------------------------------------------------------------------
56 */
57
58

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