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wifi: cfg80211: reject non-conformant 6 GHz center frequencies

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On 6 GHz (and also 5 GHz to some degree), only a specific set of center
frequencies should be used depending on the channel bandwidth. Verify
this is the case on 6 GHz. For 5 GHz, we are more accepting as there are
APs that got it wrong historically.

Signed-off-by: Benjamin Berg <benjamin.berg@intel.com>
Signed-off-by: Miri Korenblit <miriam.rachel.korenblit@intel.com>
Link: https://msgid.link/20240602102200.876b10a2beda.I0d3d0daea4014e99654437ff6691378dbe452652@changeid
Signed-off-by: Johannes Berg <johannes.berg@intel.com>
This commit is contained in:
Benjamin Berg 2024-06-02 10:22:00 +03:00 committed by Johannes Berg
parent c1d8bd8d77
commit 91b193d546
2 changed files with 49 additions and 11 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

38
net/wireless/chan.c
View File

@ -263,6 +263,37 @@ static int cfg80211_chandef_get_width(const struct cfg80211_chan_def *c)
return nl80211_chan_width_to_mhz(c->width);
}
static bool cfg80211_valid_center_freq(u32 center,
enum nl80211_chan_width width)
{
int bw;
int step;
/* We only do strict verification on 6 GHz */
if (center < 5955 || center > 7115)
return true;
bw = nl80211_chan_width_to_mhz(width);
if (bw < 0)
return false;
/* Validate that the channels bw is entirely within the 6 GHz band */
if (center - bw / 2 < 5945 || center + bw / 2 > 7125)
return false;
/* With 320 MHz the permitted channels overlap */
if (bw == 320)
step = 160;
else
step = bw;
/*
* Valid channels are packed from lowest frequency towards higher ones.
* So test that the lower frequency alignes with one of these steps.
*/
return (center - bw / 2 - 5945) % step == 0;
}
bool cfg80211_chandef_valid(const struct cfg80211_chan_def *chandef)
{
u32 control_freq, oper_freq;
@ -374,6 +405,13 @@ bool cfg80211_chandef_valid(const struct cfg80211_chan_def *chandef)
return false;
}
if (!cfg80211_valid_center_freq(chandef->center_freq1, chandef->width))
return false;
if (chandef->width == NL80211_CHAN_WIDTH_80P80 &&
!cfg80211_valid_center_freq(chandef->center_freq2, chandef->width))
return false;
/* channel 14 is only for IEEE 802.11b */
if (chandef->center_freq1 == 2484 &&
chandef->width != NL80211_CHAN_WIDTH_20_NOHT)

22
net/wireless/tests/chan.c
View File

@ -113,16 +113,16 @@ static const struct chandef_compat_case {
},
},
{
.desc = "different primary 160 MHz",
.desc = "different primary 320 MHz",
.c1 = {
.width = NL80211_CHAN_WIDTH_320,
.chan = &chan_6ghz_105,
.center_freq1 = 6475 + 150,
.center_freq1 = 6475 + 110,
},
.c2 = {
.width = NL80211_CHAN_WIDTH_320,
.chan = &chan_6ghz_105,
.center_freq1 = 6475 - 10,
.center_freq1 = 6475 - 50,
},
},
{
@ -131,12 +131,12 @@ static const struct chandef_compat_case {
.c1 = {
.width = NL80211_CHAN_WIDTH_160,
.chan = &chan_6ghz_105,
.center_freq1 = 6475 + 70,
.center_freq1 = 6475 + 30,
},
.c2 = {
.width = NL80211_CHAN_WIDTH_320,
.chan = &chan_6ghz_105,
.center_freq1 = 6475 - 10,
.center_freq1 = 6475 - 50,
},
.compat = true,
},
@ -145,12 +145,12 @@ static const struct chandef_compat_case {
.c1 = {
.width = NL80211_CHAN_WIDTH_160,
.chan = &chan_6ghz_105,
.center_freq1 = 6475 + 70,
.center_freq1 = 6475 + 30,
},
.c2 = {
.width = NL80211_CHAN_WIDTH_320,
.chan = &chan_6ghz_105,
.center_freq1 = 6475 - 10,
.center_freq1 = 6475 - 50,
.punctured = 0xf,
},
.compat = true,
@ -160,13 +160,13 @@ static const struct chandef_compat_case {
.c1 = {
.width = NL80211_CHAN_WIDTH_160,
.chan = &chan_6ghz_105,
.center_freq1 = 6475 + 70,
.center_freq1 = 6475 + 30,
.punctured = 0xc0,
},
.c2 = {
.width = NL80211_CHAN_WIDTH_320,
.chan = &chan_6ghz_105,
.center_freq1 = 6475 - 10,
.center_freq1 = 6475 - 50,
.punctured = 0xc000,
},
.compat = true,
@ -176,13 +176,13 @@ static const struct chandef_compat_case {
.c1 = {
.width = NL80211_CHAN_WIDTH_160,
.chan = &chan_6ghz_105,
.center_freq1 = 6475 + 70,
.center_freq1 = 6475 + 30,
.punctured = 0x80,
},
.c2 = {
.width = NL80211_CHAN_WIDTH_320,
.chan = &chan_6ghz_105,
.center_freq1 = 6475 - 10,
.center_freq1 = 6475 - 50,
.punctured = 0xc000,
},
},