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https://github.com/vanhoefm/fragattacks.git
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1ac4dba31a
Extend verify_channel() to return whether IR is allowed on the channel or not, and make it a global function so it can be used in other files, too. This makes this function useful for checking not only if a channel is supported but also if it is allowed for active and passive scan. Signed-off-by: Avraham Stern <avraham.stern@intel.com>
326 lines
8.0 KiB
C
326 lines
8.0 KiB
C
/*
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* Operating classes
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* Copyright(c) 2015 Intel Deutschland GmbH
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* Contact Information:
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* Intel Linux Wireless <ilw@linux.intel.com>
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* Intel Corporation, 5200 N.E. Elam Young Parkway, Hillsboro, OR 97124-6497
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*
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* This software may be distributed under the terms of the BSD license.
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* See README for more details.
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*/
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#include "utils/includes.h"
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#include "utils/common.h"
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#include "common/ieee802_11_common.h"
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#include "wpa_supplicant_i.h"
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static enum chan_allowed allow_channel(struct hostapd_hw_modes *mode, u8 chan,
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unsigned int *flags)
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{
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int i;
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for (i = 0; i < mode->num_channels; i++) {
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if (mode->channels[i].chan == chan)
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break;
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}
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if (i == mode->num_channels ||
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(mode->channels[i].flag & HOSTAPD_CHAN_DISABLED))
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return NOT_ALLOWED;
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if (flags)
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*flags = mode->channels[i].flag;
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if (mode->channels[i].flag & HOSTAPD_CHAN_NO_IR)
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return NO_IR;
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return ALLOWED;
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}
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static int get_center_80mhz(struct hostapd_hw_modes *mode, u8 channel)
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{
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u8 center_channels[] = { 42, 58, 106, 122, 138, 155 };
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size_t i;
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if (mode->mode != HOSTAPD_MODE_IEEE80211A)
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return 0;
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for (i = 0; i < ARRAY_SIZE(center_channels); i++) {
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/*
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* In 80 MHz, the bandwidth "spans" 12 channels (e.g., 36-48),
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* so the center channel is 6 channels away from the start/end.
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*/
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if (channel >= center_channels[i] - 6 &&
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channel <= center_channels[i] + 6)
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return center_channels[i];
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}
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return 0;
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}
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static enum chan_allowed verify_80mhz(struct hostapd_hw_modes *mode, u8 channel)
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{
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u8 center_chan;
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unsigned int i;
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unsigned int no_ir = 0;
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center_chan = get_center_80mhz(mode, channel);
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if (!center_chan)
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return NOT_ALLOWED;
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/* check all the channels are available */
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for (i = 0; i < 4; i++) {
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unsigned int flags;
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u8 adj_chan = center_chan - 6 + i * 4;
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if (allow_channel(mode, adj_chan, &flags) == NOT_ALLOWED)
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return NOT_ALLOWED;
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if ((i == 0 && !(flags & HOSTAPD_CHAN_VHT_10_70)) ||
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(i == 1 && !(flags & HOSTAPD_CHAN_VHT_30_50)) ||
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(i == 2 && !(flags & HOSTAPD_CHAN_VHT_50_30)) ||
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(i == 3 && !(flags & HOSTAPD_CHAN_VHT_70_10)))
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return NOT_ALLOWED;
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if (flags & HOSTAPD_CHAN_NO_IR)
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no_ir = 1;
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}
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if (no_ir)
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return NO_IR;
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return ALLOWED;
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}
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static int get_center_160mhz(struct hostapd_hw_modes *mode, u8 channel)
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{
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u8 center_channels[] = { 50, 114 };
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unsigned int i;
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if (mode->mode != HOSTAPD_MODE_IEEE80211A)
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return 0;
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for (i = 0; i < ARRAY_SIZE(center_channels); i++) {
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/*
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* In 160 MHz, the bandwidth "spans" 28 channels (e.g., 36-64),
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* so the center channel is 14 channels away from the start/end.
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*/
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if (channel >= center_channels[i] - 14 &&
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channel <= center_channels[i] + 14)
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return center_channels[i];
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}
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return 0;
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}
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static enum chan_allowed verify_160mhz(struct hostapd_hw_modes *mode,
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u8 channel)
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{
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u8 center_chan;
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unsigned int i;
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unsigned int no_ir = 0;
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center_chan = get_center_160mhz(mode, channel);
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if (!center_chan)
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return NOT_ALLOWED;
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/* Check all the channels are available */
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for (i = 0; i < 8; i++) {
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unsigned int flags;
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u8 adj_chan = center_chan - 14 + i * 4;
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if (allow_channel(mode, adj_chan, &flags) == NOT_ALLOWED)
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return NOT_ALLOWED;
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if ((i == 0 && !(flags & HOSTAPD_CHAN_VHT_10_150)) ||
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(i == 1 && !(flags & HOSTAPD_CHAN_VHT_30_130)) ||
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(i == 2 && !(flags & HOSTAPD_CHAN_VHT_50_110)) ||
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(i == 3 && !(flags & HOSTAPD_CHAN_VHT_70_90)) ||
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(i == 4 && !(flags & HOSTAPD_CHAN_VHT_90_70)) ||
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(i == 5 && !(flags & HOSTAPD_CHAN_VHT_110_50)) ||
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(i == 6 && !(flags & HOSTAPD_CHAN_VHT_130_30)) ||
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(i == 7 && !(flags & HOSTAPD_CHAN_VHT_150_10)))
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return NOT_ALLOWED;
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if (flags & HOSTAPD_CHAN_NO_IR)
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no_ir = 1;
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}
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if (no_ir)
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return NO_IR;
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return ALLOWED;
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}
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enum chan_allowed verify_channel(struct hostapd_hw_modes *mode, u8 channel,
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u8 bw)
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{
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unsigned int flag = 0;
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enum chan_allowed res, res2;
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res2 = res = allow_channel(mode, channel, &flag);
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if (bw == BW40MINUS) {
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if (!(flag & HOSTAPD_CHAN_HT40MINUS))
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return NOT_ALLOWED;
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res2 = allow_channel(mode, channel - 4, NULL);
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} else if (bw == BW40PLUS) {
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if (!(flag & HOSTAPD_CHAN_HT40PLUS))
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return NOT_ALLOWED;
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res2 = allow_channel(mode, channel + 4, NULL);
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} else if (bw == BW80) {
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/*
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* channel is a center channel and as such, not necessarily a
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* valid 20 MHz channels. Override earlier allow_channel()
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* result and use only the 80 MHz specific version.
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*/
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res2 = res = verify_80mhz(mode, channel);
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} else if (bw == BW160) {
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/*
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* channel is a center channel and as such, not necessarily a
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* valid 20 MHz channels. Override earlier allow_channel()
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* result and use only the 160 MHz specific version.
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*/
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res2 = res = verify_160mhz(mode, channel);
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} else if (bw == BW80P80) {
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/*
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* channel is a center channel and as such, not necessarily a
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* valid 20 MHz channels. Override earlier allow_channel()
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* result and use only the 80 MHz specific version.
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*/
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res2 = res = verify_80mhz(mode, channel);
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}
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if (res == NOT_ALLOWED || res2 == NOT_ALLOWED)
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return NOT_ALLOWED;
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if (res == NO_IR || res2 == NO_IR)
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return NO_IR;
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return ALLOWED;
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}
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static int wpas_op_class_supported(struct wpa_supplicant *wpa_s,
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const struct oper_class_map *op_class)
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{
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int chan;
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size_t i;
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struct hostapd_hw_modes *mode;
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int found;
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mode = get_mode(wpa_s->hw.modes, wpa_s->hw.num_modes, op_class->mode);
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if (!mode)
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return 0;
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if (op_class->op_class == 128) {
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u8 channels[] = { 42, 58, 106, 122, 138, 155 };
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for (i = 0; i < ARRAY_SIZE(channels); i++) {
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if (verify_channel(mode, channels[i], op_class->bw) !=
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NOT_ALLOWED)
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return 1;
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}
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return 0;
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}
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if (op_class->op_class == 129) {
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/* Check if either 160 MHz channels is allowed */
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return verify_channel(mode, 50, op_class->bw) != NOT_ALLOWED ||
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verify_channel(mode, 114, op_class->bw) != NOT_ALLOWED;
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}
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if (op_class->op_class == 130) {
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/* Need at least two non-contiguous 80 MHz segments */
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found = 0;
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if (verify_channel(mode, 42, op_class->bw) != NOT_ALLOWED ||
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verify_channel(mode, 58, op_class->bw) != NOT_ALLOWED)
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found++;
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if (verify_channel(mode, 106, op_class->bw) != NOT_ALLOWED ||
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verify_channel(mode, 122, op_class->bw) != NOT_ALLOWED ||
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verify_channel(mode, 138, op_class->bw) != NOT_ALLOWED)
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found++;
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if (verify_channel(mode, 106, op_class->bw) != NOT_ALLOWED &&
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verify_channel(mode, 138, op_class->bw) != NOT_ALLOWED)
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found++;
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if (verify_channel(mode, 155, op_class->bw) != NOT_ALLOWED)
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found++;
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if (found >= 2)
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return 1;
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return 0;
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}
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found = 0;
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for (chan = op_class->min_chan; chan <= op_class->max_chan;
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chan += op_class->inc) {
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if (verify_channel(mode, chan, op_class->bw) != NOT_ALLOWED) {
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found = 1;
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break;
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}
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}
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return found;
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}
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size_t wpas_supp_op_class_ie(struct wpa_supplicant *wpa_s, int freq, u8 *pos,
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size_t len)
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{
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struct wpabuf *buf;
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u8 op, current, chan;
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u8 *ie_len;
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size_t res;
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/*
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* Assume 20 MHz channel for now.
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* TODO: Use the secondary channel and VHT channel width that will be
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* used after association.
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*/
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if (ieee80211_freq_to_channel_ext(freq, 0, VHT_CHANWIDTH_USE_HT,
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¤t, &chan) == NUM_HOSTAPD_MODES)
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return 0;
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/*
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* Need 3 bytes for EID, length, and current operating class, plus
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* 1 byte for every other supported operating class.
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*/
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buf = wpabuf_alloc(global_op_class_size + 3);
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if (!buf)
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return 0;
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wpabuf_put_u8(buf, WLAN_EID_SUPPORTED_OPERATING_CLASSES);
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/* Will set the length later, putting a placeholder */
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ie_len = wpabuf_put(buf, 1);
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wpabuf_put_u8(buf, current);
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for (op = 0; global_op_class[op].op_class; op++) {
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if (wpas_op_class_supported(wpa_s, &global_op_class[op]))
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wpabuf_put_u8(buf, global_op_class[op].op_class);
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}
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*ie_len = wpabuf_len(buf) - 2;
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if (*ie_len < 2 || wpabuf_len(buf) > len) {
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wpa_printf(MSG_ERROR,
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"Failed to add supported operating classes IE");
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res = 0;
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} else {
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os_memcpy(pos, wpabuf_head(buf), wpabuf_len(buf));
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res = wpabuf_len(buf);
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wpa_hexdump_buf(MSG_DEBUG,
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"Added supported operating classes IE", buf);
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}
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wpabuf_free(buf);
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return res;
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}
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