400 lines
10 KiB
C
400 lines
10 KiB
C
/*
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* Received Data frame processing
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* Copyright (c) 2010, Jouni Malinen <j@w1.fi>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* Alternatively, this software may be distributed under the terms of BSD
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* license.
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*
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* See README and COPYING for more details.
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*/
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#include "utils/includes.h"
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#include <linux/if_ether.h>
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#include "utils/common.h"
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#include "common/defs.h"
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#include "common/ieee802_11_defs.h"
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#include "wlantest.h"
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static const char * data_stype(u16 stype)
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{
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switch (stype) {
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case WLAN_FC_STYPE_DATA:
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return "DATA";
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case WLAN_FC_STYPE_DATA_CFACK:
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return "DATA-CFACK";
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case WLAN_FC_STYPE_DATA_CFPOLL:
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return "DATA-CFPOLL";
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case WLAN_FC_STYPE_DATA_CFACKPOLL:
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return "DATA-CFACKPOLL";
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case WLAN_FC_STYPE_NULLFUNC:
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return "NULLFUNC";
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case WLAN_FC_STYPE_CFACK:
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return "CFACK";
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case WLAN_FC_STYPE_CFPOLL:
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return "CFPOLL";
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case WLAN_FC_STYPE_CFACKPOLL:
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return "CFACKPOLL";
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case WLAN_FC_STYPE_QOS_DATA:
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return "QOSDATA";
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case WLAN_FC_STYPE_QOS_DATA_CFACK:
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return "QOSDATA-CFACK";
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case WLAN_FC_STYPE_QOS_DATA_CFPOLL:
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return "QOSDATA-CFPOLL";
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case WLAN_FC_STYPE_QOS_DATA_CFACKPOLL:
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return "QOSDATA-CFACKPOLL";
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case WLAN_FC_STYPE_QOS_NULL:
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return "QOS-NULL";
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case WLAN_FC_STYPE_QOS_CFPOLL:
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return "QOS-CFPOLL";
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case WLAN_FC_STYPE_QOS_CFACKPOLL:
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return "QOS-CFACKPOLL";
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}
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return "??";
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}
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static void rx_data_eth(struct wlantest *wt, const u8 *bssid,
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const u8 *sta_addr, const u8 *dst, const u8 *src,
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u16 ethertype, const u8 *data, size_t len, int prot)
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{
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switch (ethertype) {
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case ETH_P_PAE:
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rx_data_eapol(wt, dst, src, data, len, prot);
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break;
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case ETH_P_IP:
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rx_data_ip(wt, bssid, sta_addr, dst, src, data, len);
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break;
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}
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}
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static void rx_data_process(struct wlantest *wt, const u8 *bssid,
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const u8 *sta_addr,
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const u8 *dst, const u8 *src,
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const u8 *data, size_t len, int prot)
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{
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if (len == 0)
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return;
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if (len >= 8 && os_memcmp(data, "\xaa\xaa\x03\x00\x00\x00", 6) == 0) {
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rx_data_eth(wt, bssid, sta_addr, dst, src,
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WPA_GET_BE16(data + 6), data + 8, len - 8, prot);
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return;
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}
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wpa_hexdump(MSG_DEBUG, "Unrecognized LLC", data, len > 8 ? 8 : len);
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}
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static void rx_data_bss_prot_group(struct wlantest *wt,
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const struct ieee80211_hdr *hdr,
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const u8 *qos, const u8 *dst, const u8 *src,
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const u8 *data, size_t len)
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{
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struct wlantest_bss *bss;
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int keyid;
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u8 *decrypted;
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size_t dlen;
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u8 pn[6];
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bss = bss_get(wt, hdr->addr2);
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if (bss == NULL)
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return;
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if (len < 4) {
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wpa_printf(MSG_INFO, "Too short group addressed data frame");
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return;
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}
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if (bss->group_cipher & (WPA_CIPHER_TKIP | WPA_CIPHER_CCMP) &&
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!(data[3] & 0x20)) {
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wpa_printf(MSG_INFO, "Expected TKIP/CCMP frame from "
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MACSTR " did not have ExtIV bit set to 1",
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MAC2STR(bss->bssid));
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return;
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}
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if (bss->group_cipher == WPA_CIPHER_TKIP) {
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if (data[3] & 0x1f) {
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wpa_printf(MSG_INFO, "TKIP frame from " MACSTR " used "
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"non-zero reserved bit",
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MAC2STR(bss->bssid));
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}
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if (data[1] != ((data[0] | 0x20) & 0x7f)) {
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wpa_printf(MSG_INFO, "TKIP frame from " MACSTR " used "
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"incorrect WEPSeed[1] (was 0x%x, expected "
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"0x%x)",
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MAC2STR(bss->bssid), data[1],
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(data[0] | 0x20) & 0x7f);
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}
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} else if (bss->group_cipher == WPA_CIPHER_CCMP) {
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if (data[2] != 0 || (data[3] & 0x1f) != 0) {
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wpa_printf(MSG_INFO, "CCMP frame from " MACSTR " used "
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"non-zero reserved bit",
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MAC2STR(bss->bssid));
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}
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}
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keyid = data[3] >> 6;
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if (bss->gtk_len[keyid] == 0) {
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wpa_printf(MSG_MSGDUMP, "No GTK known to decrypt the frame "
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"(A2=" MACSTR " KeyID=%d)",
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MAC2STR(hdr->addr2), keyid);
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return;
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}
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if (bss->group_cipher == WPA_CIPHER_TKIP)
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tkip_get_pn(pn, data);
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else
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ccmp_get_pn(pn, data);
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if (os_memcmp(pn, bss->rsc[keyid], 6) <= 0) {
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wpa_printf(MSG_INFO, "CCMP/TKIP replay detected: SA=" MACSTR,
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MAC2STR(hdr->addr2));
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wpa_hexdump(MSG_INFO, "RX PN", pn, 6);
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wpa_hexdump(MSG_INFO, "RSC", bss->rsc[keyid], 6);
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}
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if (bss->group_cipher == WPA_CIPHER_TKIP)
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decrypted = tkip_decrypt(bss->gtk[keyid], hdr, data, len,
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&dlen);
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else
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decrypted = ccmp_decrypt(bss->gtk[keyid], hdr, data, len,
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&dlen);
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if (decrypted) {
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rx_data_process(wt, bss->bssid, NULL, dst, src, decrypted,
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dlen, 1);
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os_memcpy(bss->rsc[keyid], pn, 6);
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write_pcap_decrypted(wt, (const u8 *) hdr, 24 + (qos ? 2 : 0),
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decrypted, dlen);
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}
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os_free(decrypted);
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}
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static void rx_data_bss_prot(struct wlantest *wt,
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const struct ieee80211_hdr *hdr, const u8 *qos,
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const u8 *dst, const u8 *src, const u8 *data,
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size_t len)
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{
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struct wlantest_bss *bss;
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struct wlantest_sta *sta;
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int keyid;
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u16 fc = le_to_host16(hdr->frame_control);
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u8 *decrypted;
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size_t dlen;
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int tid;
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u8 pn[6], *rsc;
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if (hdr->addr1[0] & 0x01) {
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rx_data_bss_prot_group(wt, hdr, qos, dst, src, data, len);
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return;
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}
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if (fc & WLAN_FC_TODS) {
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bss = bss_get(wt, hdr->addr1);
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if (bss == NULL)
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return;
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sta = sta_get(bss, hdr->addr2);
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} else {
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bss = bss_get(wt, hdr->addr2);
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if (bss == NULL)
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return;
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sta = sta_get(bss, hdr->addr1);
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}
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if (sta == NULL || !sta->ptk_set) {
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wpa_printf(MSG_MSGDUMP, "No PTK known to decrypt the frame");
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return;
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}
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if (len < 4) {
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wpa_printf(MSG_INFO, "Too short encrypted data frame");
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return;
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}
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if (sta->pairwise_cipher & (WPA_CIPHER_TKIP | WPA_CIPHER_CCMP) &&
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!(data[3] & 0x20)) {
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wpa_printf(MSG_INFO, "Expected TKIP/CCMP frame from "
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MACSTR " did not have ExtIV bit set to 1",
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MAC2STR(src));
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return;
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}
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if (sta->pairwise_cipher == WPA_CIPHER_TKIP) {
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if (data[3] & 0x1f) {
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wpa_printf(MSG_INFO, "TKIP frame from " MACSTR " used "
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"non-zero reserved bit",
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MAC2STR(hdr->addr2));
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}
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if (data[1] != ((data[0] | 0x20) & 0x7f)) {
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wpa_printf(MSG_INFO, "TKIP frame from " MACSTR " used "
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"incorrect WEPSeed[1] (was 0x%x, expected "
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"0x%x)",
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MAC2STR(hdr->addr2), data[1],
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(data[0] | 0x20) & 0x7f);
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}
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} else if (sta->pairwise_cipher == WPA_CIPHER_CCMP) {
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if (data[2] != 0 || (data[3] & 0x1f) != 0) {
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wpa_printf(MSG_INFO, "CCMP frame from " MACSTR " used "
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"non-zero reserved bit",
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MAC2STR(hdr->addr2));
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}
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}
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keyid = data[3] >> 6;
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if (keyid != 0) {
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wpa_printf(MSG_INFO, "Unexpected non-zero KeyID %d in "
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"individually addressed Data frame from " MACSTR,
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keyid, MAC2STR(hdr->addr2));
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}
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if (qos)
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tid = qos[0] & 0x0f;
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else
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tid = 0;
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if (fc & WLAN_FC_TODS)
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rsc = sta->rsc_tods[tid];
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else
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rsc = sta->rsc_fromds[tid];
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if (sta->pairwise_cipher == WPA_CIPHER_TKIP)
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tkip_get_pn(pn, data);
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else
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ccmp_get_pn(pn, data);
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if (os_memcmp(pn, rsc, 6) <= 0) {
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wpa_printf(MSG_INFO, "CCMP/TKIP replay detected: SA=" MACSTR,
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MAC2STR(hdr->addr2));
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wpa_hexdump(MSG_INFO, "RX PN", pn, 6);
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wpa_hexdump(MSG_INFO, "RSC", rsc, 6);
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}
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if (sta->pairwise_cipher == WPA_CIPHER_TKIP)
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decrypted = tkip_decrypt(sta->ptk.tk1, hdr, data, len, &dlen);
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else
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decrypted = ccmp_decrypt(sta->ptk.tk1, hdr, data, len, &dlen);
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if (decrypted) {
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rx_data_process(wt, bss->bssid, sta->addr, dst, src, decrypted,
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dlen, 1);
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os_memcpy(rsc, pn, 6);
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write_pcap_decrypted(wt, (const u8 *) hdr, 24 + (qos ? 2 : 0),
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decrypted, dlen);
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}
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os_free(decrypted);
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}
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static void rx_data_bss(struct wlantest *wt, const struct ieee80211_hdr *hdr,
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const u8 *qos, const u8 *dst, const u8 *src,
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const u8 *data, size_t len)
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{
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u16 fc = le_to_host16(hdr->frame_control);
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int prot = !!(fc & WLAN_FC_ISWEP);
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if (qos) {
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u8 ack = (qos[0] & 0x60) >> 5;
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wpa_printf(MSG_MSGDUMP, "BSS DATA: " MACSTR " -> " MACSTR
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" len=%u%s tid=%u%s%s",
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MAC2STR(src), MAC2STR(dst), (unsigned int) len,
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prot ? " Prot" : "", qos[0] & 0x0f,
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(qos[0] & 0x10) ? " EOSP" : "",
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ack == 0 ? "" :
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(ack == 1 ? " NoAck" :
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(ack == 2 ? " NoExpAck" : " BA")));
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} else {
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wpa_printf(MSG_MSGDUMP, "BSS DATA: " MACSTR " -> " MACSTR
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" len=%u%s",
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MAC2STR(src), MAC2STR(dst), (unsigned int) len,
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prot ? " Prot" : "");
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}
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if (prot)
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rx_data_bss_prot(wt, hdr, qos, dst, src, data, len);
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else {
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const u8 *bssid, *sta_addr;
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if (fc & WLAN_FC_TODS) {
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bssid = hdr->addr1;
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sta_addr = hdr->addr2;
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} else {
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bssid = hdr->addr2;
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sta_addr = hdr->addr1;
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}
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rx_data_process(wt, bssid, sta_addr, dst, src, data, len, 0);
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}
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}
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void rx_data(struct wlantest *wt, const u8 *data, size_t len)
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{
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const struct ieee80211_hdr *hdr;
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u16 fc, stype;
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size_t hdrlen;
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const u8 *qos = NULL;
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if (len < 24)
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return;
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hdr = (const struct ieee80211_hdr *) data;
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fc = le_to_host16(hdr->frame_control);
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stype = WLAN_FC_GET_STYPE(fc);
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hdrlen = 24;
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if ((fc & (WLAN_FC_TODS | WLAN_FC_FROMDS)) ==
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(WLAN_FC_TODS | WLAN_FC_FROMDS))
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hdrlen += ETH_ALEN;
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if (stype & 0x08) {
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qos = data + hdrlen;
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hdrlen += 2;
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}
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if (len < hdrlen)
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return;
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wt->rx_data++;
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switch (fc & (WLAN_FC_TODS | WLAN_FC_FROMDS)) {
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case 0:
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wpa_printf(MSG_EXCESSIVE, "DATA %s%s%s IBSS DA=" MACSTR " SA="
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MACSTR " BSSID=" MACSTR,
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data_stype(WLAN_FC_GET_STYPE(fc)),
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fc & WLAN_FC_PWRMGT ? " PwrMgt" : "",
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fc & WLAN_FC_ISWEP ? " Prot" : "",
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MAC2STR(hdr->addr1), MAC2STR(hdr->addr2),
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MAC2STR(hdr->addr3));
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break;
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case WLAN_FC_FROMDS:
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wpa_printf(MSG_EXCESSIVE, "DATA %s%s%s FromDS DA=" MACSTR
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" BSSID=" MACSTR " SA=" MACSTR,
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data_stype(WLAN_FC_GET_STYPE(fc)),
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fc & WLAN_FC_PWRMGT ? " PwrMgt" : "",
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fc & WLAN_FC_ISWEP ? " Prot" : "",
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MAC2STR(hdr->addr1), MAC2STR(hdr->addr2),
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MAC2STR(hdr->addr3));
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rx_data_bss(wt, hdr, qos, hdr->addr1, hdr->addr2,
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data + hdrlen, len - hdrlen);
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break;
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case WLAN_FC_TODS:
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wpa_printf(MSG_EXCESSIVE, "DATA %s%s%s ToDS BSSID=" MACSTR
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" SA=" MACSTR " DA=" MACSTR,
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data_stype(WLAN_FC_GET_STYPE(fc)),
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fc & WLAN_FC_PWRMGT ? " PwrMgt" : "",
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fc & WLAN_FC_ISWEP ? " Prot" : "",
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MAC2STR(hdr->addr1), MAC2STR(hdr->addr2),
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MAC2STR(hdr->addr3));
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rx_data_bss(wt, hdr, qos, hdr->addr3, hdr->addr2,
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data + hdrlen, len - hdrlen);
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break;
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case WLAN_FC_TODS | WLAN_FC_FROMDS:
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wpa_printf(MSG_EXCESSIVE, "DATA %s%s%s WDS RA=" MACSTR " TA="
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MACSTR " DA=" MACSTR " SA=" MACSTR,
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data_stype(WLAN_FC_GET_STYPE(fc)),
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fc & WLAN_FC_PWRMGT ? " PwrMgt" : "",
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fc & WLAN_FC_ISWEP ? " Prot" : "",
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MAC2STR(hdr->addr1), MAC2STR(hdr->addr2),
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MAC2STR(hdr->addr3),
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MAC2STR((const u8 *) (hdr + 1)));
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break;
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}
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}
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