mirror of
https://github.com/vanhoefm/fragattacks.git
synced 2024-11-29 02:38:22 -05:00
Make check_40mhz_2g4 common
Signed-off-by: Janusz Dziedzic <janusz.dziedzic@tieto.com>
This commit is contained in:
Janusz Dziedzic
Jouni Malinen
parent
fdd989d17a
commit
a828f626af
@ -249,13 +249,6 @@ static void ieee80211n_switch_pri_sec(struct hostapd_iface *iface)
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}
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static void ieee80211n_get_pri_sec_chan(struct wpa_scan_res *bss,
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int *pri_chan, int *sec_chan)
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{
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return get_pri_sec_chan(bss, pri_chan, sec_chan);
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}
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static int ieee80211n_check_40mhz_5g(struct hostapd_iface *iface,
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struct wpa_scan_results *scan_res)
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{
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@ -274,94 +267,16 @@ static int ieee80211n_check_40mhz_5g(struct hostapd_iface *iface,
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}
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static int ieee80211n_check_20mhz_bss(struct wpa_scan_res *bss, int pri_freq,
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int start, int end)
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{
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return check_20mhz_bss(bss, pri_freq, start, end);
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}
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static int ieee80211n_check_40mhz_2g4(struct hostapd_iface *iface,
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struct wpa_scan_results *scan_res)
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{
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int pri_freq, sec_freq;
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int affected_start, affected_end;
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size_t i;
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int pri_chan, sec_chan;
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pri_freq = hostapd_hw_get_freq(iface->bss[0], iface->conf->channel);
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if (iface->conf->secondary_channel > 0)
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sec_freq = pri_freq + 20;
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else
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sec_freq = pri_freq - 20;
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affected_start = (pri_freq + sec_freq) / 2 - 25;
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affected_end = (pri_freq + sec_freq) / 2 + 25;
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wpa_printf(MSG_DEBUG, "40 MHz affected channel range: [%d,%d] MHz",
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affected_start, affected_end);
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for (i = 0; i < scan_res->num; i++) {
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struct wpa_scan_res *bss = scan_res->res[i];
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int pri = bss->freq;
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int sec = pri;
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int sec_chan, pri_chan;
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struct ieee802_11_elems elems;
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pri_chan = iface->conf->channel;
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sec_chan = pri_chan + iface->conf->secondary_channel * 4;
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/* Check for overlapping 20 MHz BSS */
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if (ieee80211n_check_20mhz_bss(bss, pri_freq, affected_start,
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affected_end)) {
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wpa_printf(MSG_DEBUG,
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"Overlapping 20 MHz BSS is found");
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return 0;
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}
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ieee80211n_get_pri_sec_chan(bss, &pri_chan, &sec_chan);
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if (sec_chan) {
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if (sec_chan < pri_chan)
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sec = pri - 20;
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else
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sec = pri + 20;
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}
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if ((pri < affected_start || pri > affected_end) &&
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(sec < affected_start || sec > affected_end))
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continue; /* not within affected channel range */
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wpa_printf(MSG_DEBUG, "Neighboring BSS: " MACSTR
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" freq=%d pri=%d sec=%d",
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MAC2STR(bss->bssid), bss->freq, pri_chan, sec_chan);
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if (sec_chan) {
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if (pri_freq != pri || sec_freq != sec) {
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wpa_printf(MSG_DEBUG, "40 MHz pri/sec "
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"mismatch with BSS " MACSTR
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" <%d,%d> (chan=%d%c) vs. <%d,%d>",
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MAC2STR(bss->bssid),
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pri, sec, pri_chan,
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sec > pri ? '+' : '-',
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pri_freq, sec_freq);
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return 0;
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}
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}
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ieee802_11_parse_elems((u8 *) (bss + 1), bss->ie_len, &elems,
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0);
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if (elems.ht_capabilities &&
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elems.ht_capabilities_len >=
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sizeof(struct ieee80211_ht_capabilities)) {
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struct ieee80211_ht_capabilities *ht_cap =
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(struct ieee80211_ht_capabilities *)
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elems.ht_capabilities;
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if (le_to_host16(ht_cap->ht_capabilities_info) &
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HT_CAP_INFO_40MHZ_INTOLERANT) {
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wpa_printf(MSG_DEBUG,
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"40 MHz Intolerant is set on channel %d in BSS "
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MACSTR, pri, MAC2STR(bss->bssid));
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return 0;
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}
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}
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}
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return 1;
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return check_40mhz_2g4(iface->current_mode, scan_res, pri_chan,
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sec_chan);
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}
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@ -265,3 +265,92 @@ int check_20mhz_bss(struct wpa_scan_res *bss, int pri_freq, int start, int end)
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}
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return 0;
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}
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int check_40mhz_2g4(struct hostapd_hw_modes *mode,
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struct wpa_scan_results *scan_res, int pri_chan,
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int sec_chan)
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{
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int pri_freq, sec_freq;
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int affected_start, affected_end;
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size_t i;
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if (!mode || !scan_res || !pri_chan || !sec_chan)
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return 0;
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if (pri_chan == sec_chan)
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return 0;
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pri_freq = hw_get_freq(mode, pri_chan);
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sec_freq = hw_get_freq(mode, sec_chan);
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affected_start = (pri_freq + sec_freq) / 2 - 25;
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affected_end = (pri_freq + sec_freq) / 2 + 25;
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wpa_printf(MSG_DEBUG, "40 MHz affected channel range: [%d,%d] MHz",
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affected_start, affected_end);
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for (i = 0; i < scan_res->num; i++) {
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struct wpa_scan_res *bss = scan_res->res[i];
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int pri = bss->freq;
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int sec = pri;
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struct ieee802_11_elems elems;
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/* Check for overlapping 20 MHz BSS */
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if (check_20mhz_bss(bss, pri_freq, affected_start,
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affected_end)) {
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wpa_printf(MSG_DEBUG,
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"Overlapping 20 MHz BSS is found");
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return 0;
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}
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get_pri_sec_chan(bss, &pri_chan, &sec_chan);
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if (sec_chan) {
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if (sec_chan < pri_chan)
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sec = pri - 20;
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else
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sec = pri + 20;
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}
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if ((pri < affected_start || pri > affected_end) &&
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(sec < affected_start || sec > affected_end))
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continue; /* not within affected channel range */
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wpa_printf(MSG_DEBUG, "Neighboring BSS: " MACSTR
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" freq=%d pri=%d sec=%d",
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MAC2STR(bss->bssid), bss->freq, pri_chan, sec_chan);
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if (sec_chan) {
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if (pri_freq != pri || sec_freq != sec) {
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wpa_printf(MSG_DEBUG,
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"40 MHz pri/sec mismatch with BSS "
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MACSTR
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" <%d,%d> (chan=%d%c) vs. <%d,%d>",
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MAC2STR(bss->bssid),
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pri, sec, pri_chan,
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sec > pri ? '+' : '-',
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pri_freq, sec_freq);
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return 0;
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}
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}
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ieee802_11_parse_elems((u8 *) (bss + 1), bss->ie_len, &elems,
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0);
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if (elems.ht_capabilities &&
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elems.ht_capabilities_len >=
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sizeof(struct ieee80211_ht_capabilities)) {
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struct ieee80211_ht_capabilities *ht_cap =
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(struct ieee80211_ht_capabilities *)
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elems.ht_capabilities;
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if (le_to_host16(ht_cap->ht_capabilities_info) &
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HT_CAP_INFO_40MHZ_INTOLERANT) {
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wpa_printf(MSG_DEBUG,
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"40 MHz Intolerant is set on channel %d in BSS "
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MACSTR, pri, MAC2STR(bss->bssid));
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return 0;
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}
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}
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}
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return 1;
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}
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@ -27,5 +27,8 @@ int check_40mhz_5g(struct hostapd_hw_modes *mode,
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struct wpa_scan_results *scan_res, int pri_chan,
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int sec_chan);
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int check_20mhz_bss(struct wpa_scan_res *bss, int pri_freq, int start, int end);
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int check_40mhz_2g4(struct hostapd_hw_modes *mode,
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struct wpa_scan_results *scan_res, int pri_chan,
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int sec_chan);
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#endif /* HW_FEATURES_COMMON_H */
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