diff options
Diffstat (limited to 'net/wireless')
| -rw-r--r-- | net/wireless/reg.c | 74 | ||||
| -rw-r--r-- | net/wireless/reg.h | 11 | ||||
| -rw-r--r-- | net/wireless/sme.c | 1 |
3 files changed, 66 insertions, 20 deletions
diff --git a/net/wireless/reg.c b/net/wireless/reg.c index f3b77f7..5f8071d 100644 --- a/net/wireless/reg.c +++ b/net/wireless/reg.c @@ -485,6 +485,34 @@ static bool freq_in_rule_band(const struct ieee80211_freq_range *freq_range, } /* + * This is a work around for sanity checking ieee80211_channel_to_frequency()'s + * work. ieee80211_channel_to_frequency() can for example currently provide a + * 2 GHz channel when in fact a 5 GHz channel was desired. An example would be + * an AP providing channel 8 on a country IE triplet when it sent this on the + * 5 GHz band, that channel is designed to be channel 8 on 5 GHz, not a 2 GHz + * channel. + * + * This can be removed once ieee80211_channel_to_frequency() takes in a band. + */ +static bool chan_in_band(int chan, enum ieee80211_band band) +{ + int center_freq = ieee80211_channel_to_frequency(chan); + + switch (band) { + case IEEE80211_BAND_2GHZ: + if (center_freq <= 2484) + return true; + return false; + case IEEE80211_BAND_5GHZ: + if (center_freq >= 5005) + return true; + return false; + default: + return false; + } +} + +/* * Some APs may send a country IE triplet for each channel they * support and while this is completely overkill and silly we still * need to support it. We avoid making a single rule for each channel @@ -532,7 +560,8 @@ static bool freq_in_rule_band(const struct ieee80211_freq_range *freq_range, * Returns 0 if the IE has been found to be invalid in the middle * somewhere. */ -static int max_subband_chan(int orig_cur_chan, +static int max_subband_chan(enum ieee80211_band band, + int orig_cur_chan, int orig_end_channel, s8 orig_max_power, u8 **country_ie, @@ -541,7 +570,6 @@ static int max_subband_chan(int orig_cur_chan, u8 *triplets_start = *country_ie; u8 len_at_triplet = *country_ie_len; int end_subband_chan = orig_end_channel; - enum ieee80211_band band; /* * We'll deal with padding for the caller unless @@ -557,17 +585,14 @@ static int max_subband_chan(int orig_cur_chan, *country_ie += 3; *country_ie_len -= 3; - if (orig_cur_chan <= 14) - band = IEEE80211_BAND_2GHZ; - else - band = IEEE80211_BAND_5GHZ; + if (!chan_in_band(orig_cur_chan, band)) + return 0; while (*country_ie_len >= 3) { int end_channel = 0; struct ieee80211_country_ie_triplet *triplet = (struct ieee80211_country_ie_triplet *) *country_ie; int cur_channel = 0, next_expected_chan; - enum ieee80211_band next_band = IEEE80211_BAND_2GHZ; /* means last triplet is completely unrelated to this one */ if (triplet->ext.reg_extension_id >= @@ -592,6 +617,9 @@ static int max_subband_chan(int orig_cur_chan, if (triplet->chans.first_channel <= end_subband_chan) return 0; + if (!chan_in_band(triplet->chans.first_channel, band)) + return 0; + /* 2 GHz */ if (triplet->chans.first_channel <= 14) { end_channel = triplet->chans.first_channel + @@ -600,14 +628,10 @@ static int max_subband_chan(int orig_cur_chan, else { end_channel = triplet->chans.first_channel + (4 * (triplet->chans.num_channels - 1)); - next_band = IEEE80211_BAND_5GHZ; } - if (band != next_band) { - *country_ie -= 3; - *country_ie_len += 3; - break; - } + if (!chan_in_band(end_channel, band)) + return 0; if (orig_max_power != triplet->chans.max_power) { *country_ie -= 3; @@ -666,6 +690,7 @@ static int max_subband_chan(int orig_cur_chan, * with our userspace regulatory agent to get lower bounds. */ static struct ieee80211_regdomain *country_ie_2_rd( + enum ieee80211_band band, u8 *country_ie, u8 country_ie_len, u32 *checksum) @@ -743,8 +768,11 @@ static struct ieee80211_regdomain *country_ie_2_rd( if (triplet->chans.num_channels == 0) return NULL; + if (!chan_in_band(triplet->chans.first_channel, band)) + return NULL; + /* 2 GHz */ - if (triplet->chans.first_channel <= 14) + if (band == IEEE80211_BAND_2GHZ) end_channel = triplet->chans.first_channel + triplet->chans.num_channels - 1; else @@ -767,7 +795,8 @@ static struct ieee80211_regdomain *country_ie_2_rd( * or for whatever reason sends triplets with multiple channels * separated when in fact they should be together. */ - end_channel = max_subband_chan(cur_channel, + end_channel = max_subband_chan(band, + cur_channel, end_channel, triplet->chans.max_power, &country_ie, @@ -775,6 +804,9 @@ static struct ieee80211_regdomain *country_ie_2_rd( if (!end_channel) return NULL; + if (!chan_in_band(end_channel, band)) + return NULL; + cur_sub_max_channel = end_channel; /* Basic sanity check */ @@ -867,14 +899,15 @@ static struct ieee80211_regdomain *country_ie_2_rd( reg_rule->flags = flags; /* 2 GHz */ - if (triplet->chans.first_channel <= 14) + if (band == IEEE80211_BAND_2GHZ) end_channel = triplet->chans.first_channel + triplet->chans.num_channels -1; else end_channel = triplet->chans.first_channel + (4 * (triplet->chans.num_channels - 1)); - end_channel = max_subband_chan(triplet->chans.first_channel, + end_channel = max_subband_chan(band, + triplet->chans.first_channel, end_channel, triplet->chans.max_power, &country_ie, @@ -1981,8 +2014,9 @@ static bool reg_same_country_ie_hint(struct wiphy *wiphy, * therefore cannot iterate over the rdev list here. */ void regulatory_hint_11d(struct wiphy *wiphy, - u8 *country_ie, - u8 country_ie_len) + enum ieee80211_band band, + u8 *country_ie, + u8 country_ie_len) { struct ieee80211_regdomain *rd = NULL; char alpha2[2]; @@ -2028,7 +2062,7 @@ void regulatory_hint_11d(struct wiphy *wiphy, wiphy_idx_valid(last_request->wiphy_idx))) goto out; - rd = country_ie_2_rd(country_ie, country_ie_len, &checksum); + rd = country_ie_2_rd(band, country_ie, country_ie_len, &checksum); if (!rd) { REG_DBG_PRINT("cfg80211: Ignoring bogus country IE\n"); goto out; diff --git a/net/wireless/reg.h b/net/wireless/reg.h index 3362c7c..3018508 100644 --- a/net/wireless/reg.h +++ b/net/wireless/reg.h @@ -41,14 +41,25 @@ int regulatory_hint_found_beacon(struct wiphy *wiphy, * regulatory_hint_11d - hints a country IE as a regulatory domain * @wiphy: the wireless device giving the hint (used only for reporting * conflicts) + * @band: the band on which the country IE was received on. This determines + * the band we'll process the country IE channel triplets for. * @country_ie: pointer to the country IE * @country_ie_len: length of the country IE * * We will intersect the rd with the what CRDA tells us should apply * for the alpha2 this country IE belongs to, this prevents APs from * sending us incorrect or outdated information against a country. + * + * The AP is expected to provide Country IE channel triplets for the + * band it is on. It is technically possible for APs to send channel + * country IE triplets even for channels outside of the band they are + * in but for that they would have to use the regulatory extension + * in combination with a triplet but this behaviour is currently + * not observed. For this reason if a triplet is seen with channel + * information for a band the BSS is not present in it will be ignored. */ void regulatory_hint_11d(struct wiphy *wiphy, + enum ieee80211_band band, u8 *country_ie, u8 country_ie_len); diff --git a/net/wireless/sme.c b/net/wireless/sme.c index 2333d78..2ce5e16 100644 --- a/net/wireless/sme.c +++ b/net/wireless/sme.c @@ -454,6 +454,7 @@ void __cfg80211_connect_result(struct net_device *dev, const u8 *bssid, * - and country_ie[1] which is the IE length */ regulatory_hint_11d(wdev->wiphy, + bss->channel->band, country_ie + 2, country_ie[1]); } |