58 lines
1.8 KiB
C
58 lines
1.8 KiB
C
/*
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* ---------------------------------------------------------------------------
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* FILE: data_tx.c
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*
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* PURPOSE:
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* This file provides functions to send data requests to the UniFi.
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*
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* Copyright (C) 2007-2009 by Cambridge Silicon Radio Ltd.
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*
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* Refer to LICENSE.txt included with this source code for details on
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* the license terms.
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*
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* ---------------------------------------------------------------------------
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*/
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#include "csr_wifi_hip_unifi.h"
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#include "unifi_priv.h"
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int
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uf_verify_m4(unifi_priv_t *priv, const unsigned char *packet, unsigned int length)
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{
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const unsigned char *p = packet;
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u16 keyinfo;
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if (length < (4 + 5 + 8 + 32 + 16 + 8 + 8 + 16 + 1 + 8)) {
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return 1;
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}
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p += 8;
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keyinfo = p[5] << 8 | p[6]; /* big-endian */
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if (
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(p[0] == 1 || p[0] == 2) /* protocol version 802.1X-2001 (WPA) or -2004 (WPA2) */ &&
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p[1] == 3 /* EAPOL-Key */ &&
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/* don't bother checking p[2] p[3] (hh ll, packet body length) */
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(p[4] == 254 || p[4] == 2) /* descriptor type P802.1i-D3.0 (WPA) or 802.11i-2004 (WPA2) */ &&
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((keyinfo & 0x0007) == 1 || (keyinfo & 0x0007) == 2) /* key descriptor version */ &&
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(keyinfo & ~0x0207U) == 0x0108 && /* key info for 4/4 or 4/2 -- ignore key desc version and sec bit (since varies in WPA 4/4) */
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(p[4 + 5 + 8 + 32 + 16 + 8 + 8 + 16 + 0] == 0 && /* key data length (2 octets) 0 for 4/4 only */
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p[4 + 5 + 8 + 32 + 16 + 8 + 8 + 16 + 1] == 0)
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) {
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unifi_trace(priv, UDBG1, "uf_verify_m4: M4 detected \n");
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return 0;
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}
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else
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{
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return 1;
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}
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}
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/*
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* ---------------------------------------------------------------------------
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*
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* Data transport signals.
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*
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* ---------------------------------------------------------------------------
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*/
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