// SPDX-License-Identifier: GPL-2.0 /* * This file contains helper code to handle channel * settings and keeping track of what is possible at * any point in time. * * Copyright 2009 Johannes Berg * Copyright 2013-2014 Intel Mobile Communications GmbH * Copyright 2018-2020 Intel Corporation */ #include #include #include #include "core.h" #include "rdev-ops.h" static bool cfg80211_valid_60g_freq(u32 freq) { return freq >= 58320 && freq <= 70200; } void cfg80211_chandef_create(struct cfg80211_chan_def *chandef, struct ieee80211_channel *chan, enum nl80211_channel_type chan_type) { if (WARN_ON(!chan)) return; chandef->chan = chan; chandef->freq1_offset = chan->freq_offset; chandef->center_freq2 = 0; chandef->edmg.bw_config = 0; chandef->edmg.channels = 0; switch (chan_type) { case NL80211_CHAN_NO_HT: chandef->width = NL80211_CHAN_WIDTH_20_NOHT; chandef->center_freq1 = chan->center_freq; break; case NL80211_CHAN_HT20: chandef->width = NL80211_CHAN_WIDTH_20; chandef->center_freq1 = chan->center_freq; break; case NL80211_CHAN_HT40PLUS: chandef->width = NL80211_CHAN_WIDTH_40; chandef->center_freq1 = chan->center_freq + 10; break; case NL80211_CHAN_HT40MINUS: chandef->width = NL80211_CHAN_WIDTH_40; chandef->center_freq1 = chan->center_freq - 10; break; default: WARN_ON(1); } } EXPORT_SYMBOL(cfg80211_chandef_create); static bool cfg80211_edmg_chandef_valid(const struct cfg80211_chan_def *chandef) { int max_contiguous = 0; int num_of_enabled = 0; int contiguous = 0; int i; if (!chandef->edmg.channels || !chandef->edmg.bw_config) return false; if (!cfg80211_valid_60g_freq(chandef->chan->center_freq)) return false; for (i = 0; i < 6; i++) { if (chandef->edmg.channels & BIT(i)) { contiguous++; num_of_enabled++; } else { contiguous = 0; } max_contiguous = max(contiguous, max_contiguous); } /* basic verification of edmg configuration according to * IEEE P802.11ay/D4.0 section 9.4.2.251 */ /* check bw_config against contiguous edmg channels */ switch (chandef->edmg.bw_config) { case IEEE80211_EDMG_BW_CONFIG_4: case IEEE80211_EDMG_BW_CONFIG_8: case IEEE80211_EDMG_BW_CONFIG_12: if (max_contiguous < 1) return false; break; case IEEE80211_EDMG_BW_CONFIG_5: case IEEE80211_EDMG_BW_CONFIG_9: case IEEE80211_EDMG_BW_CONFIG_13: if (max_contiguous < 2) return false; break; case IEEE80211_EDMG_BW_CONFIG_6: case IEEE80211_EDMG_BW_CONFIG_10: case IEEE80211_EDMG_BW_CONFIG_14: if (max_contiguous < 3) return false; break; case IEEE80211_EDMG_BW_CONFIG_7: case IEEE80211_EDMG_BW_CONFIG_11: case IEEE80211_EDMG_BW_CONFIG_15: if (max_contiguous < 4) return false; break; default: return false; } /* check bw_config against aggregated (non contiguous) edmg channels */ switch (chandef->edmg.bw_config) { case IEEE80211_EDMG_BW_CONFIG_4: case IEEE80211_EDMG_BW_CONFIG_5: case IEEE80211_EDMG_BW_CONFIG_6: case IEEE80211_EDMG_BW_CONFIG_7: break; case IEEE80211_EDMG_BW_CONFIG_8: case IEEE80211_EDMG_BW_CONFIG_9: case IEEE80211_EDMG_BW_CONFIG_10: case IEEE80211_EDMG_BW_CONFIG_11: if (num_of_enabled < 2) return false; break; case IEEE80211_EDMG_BW_CONFIG_12: case IEEE80211_EDMG_BW_CONFIG_13: case IEEE80211_EDMG_BW_CONFIG_14: case IEEE80211_EDMG_BW_CONFIG_15: if (num_of_enabled < 4 || max_contiguous < 2) return false; break; default: return false; } return true; } static int nl80211_chan_width_to_mhz(enum nl80211_chan_width chan_width) { int mhz; switch (chan_width) { case NL80211_CHAN_WIDTH_1: mhz = 1; break; case NL80211_CHAN_WIDTH_2: mhz = 2; break; case NL80211_CHAN_WIDTH_4: mhz = 4; break; case NL80211_CHAN_WIDTH_8: mhz = 8; break; case NL80211_CHAN_WIDTH_16: mhz = 16; break; case NL80211_CHAN_WIDTH_5: mhz = 5; break; case NL80211_CHAN_WIDTH_10: mhz = 10; break; case NL80211_CHAN_WIDTH_20: case NL80211_CHAN_WIDTH_20_NOHT: mhz = 20; break; case NL80211_CHAN_WIDTH_40: mhz = 40; break; case NL80211_CHAN_WIDTH_80P80: case NL80211_CHAN_WIDTH_80: mhz = 80; break; case NL80211_CHAN_WIDTH_160: mhz = 160; break; default: WARN_ON_ONCE(1); return -1; } return mhz; } static int cfg80211_chandef_get_width(const struct cfg80211_chan_def *c) { return nl80211_chan_width_to_mhz(c->width); } bool cfg80211_chandef_valid(const struct cfg80211_chan_def *chandef) { u32 control_freq, oper_freq; int oper_width, control_width; if (!chandef->chan) return false; if (chandef->freq1_offset >= 1000) return false; control_freq = chandef->chan->center_freq; switch (chandef->width) { case NL80211_CHAN_WIDTH_1: case NL80211_CHAN_WIDTH_5: case NL80211_CHAN_WIDTH_10: case NL80211_CHAN_WIDTH_20: case NL80211_CHAN_WIDTH_20_NOHT: if (ieee80211_chandef_to_khz(chandef) != ieee80211_channel_to_khz(chandef->chan)) return false; if (chandef->center_freq2) return false; break; case NL80211_CHAN_WIDTH_2: case NL80211_CHAN_WIDTH_4: case NL80211_CHAN_WIDTH_8: case NL80211_CHAN_WIDTH_16: control_freq = ieee80211_channel_to_khz(chandef->chan); oper_freq = ieee80211_chandef_to_khz(chandef); control_width = nl80211_chan_width_to_mhz( ieee80211_s1g_channel_width( chandef->chan)); oper_width = cfg80211_chandef_get_width(chandef); if (oper_width < 0 || control_width < 0) return false; if (chandef->center_freq2) return false; if (control_freq + MHZ_TO_KHZ(control_width) / 2 > oper_freq + MHZ_TO_KHZ(oper_width) / 2) return false; if (control_freq - MHZ_TO_KHZ(control_width) / 2 < oper_freq - MHZ_TO_KHZ(oper_width) / 2) return false; break; case NL80211_CHAN_WIDTH_40: if (chandef->center_freq1 != control_freq + 10 && chandef->center_freq1 != control_freq - 10) return false; if (chandef->center_freq2) return false; break; case NL80211_CHAN_WIDTH_80P80: if (chandef->center_freq1 != control_freq + 30 && chandef->center_freq1 != control_freq + 10 && chandef->center_freq1 != control_freq - 10 && chandef->center_freq1 != control_freq - 30) return false; if (!chandef->center_freq2) return false; /* adjacent is not allowed -- that's a 160 MHz channel */ if (chandef->center_freq1 - chandef->center_freq2 == 80 || chandef->center_freq2 - chandef->center_freq1 == 80) return false; break; case NL80211_CHAN_WIDTH_80: if (chandef->center_freq1 != control_freq + 30 && chandef->center_freq1 != control_freq + 10 && chandef->center_freq1 != control_freq - 10 && chandef->center_freq1 != control_freq - 30) return false; if (chandef->center_freq2) return false; break; case NL80211_CHAN_WIDTH_160: if (chandef->center_freq1 != control_freq + 70 && chandef->center_freq1 != control_freq + 50 && chandef->center_freq1 != control_freq + 30 && chandef->center_freq1 != control_freq + 10 && chandef->center_freq1 != control_freq - 10 && chandef->center_freq1 != control_freq - 30 && chandef->center_freq1 != control_freq - 50 && chandef->center_freq1 != control_freq - 70) return false; if (chandef->center_freq2) return false; break; default: return false; } /* channel 14 is only for IEEE 802.11b */ if (chandef->center_freq1 == 2484 && chandef->width != NL80211_CHAN_WIDTH_20_NOHT) return false; if (cfg80211_chandef_is_edmg(chandef) && !cfg80211_edmg_chandef_valid(chandef)) return false; return true; } EXPORT_SYMBOL(cfg80211_chandef_valid); static void chandef_primary_freqs(const struct cfg80211_chan_def *c, u32 *pri40, u32 *pri80) { int tmp; switch (c->width) { case NL80211_CHAN_WIDTH_40: *pri40 = c->center_freq1; *pri80 = 0; break; case NL80211_CHAN_WIDTH_80: case NL80211_CHAN_WIDTH_80P80: *pri80 = c->center_freq1; /* n_P20 */ tmp = (30 + c->chan->center_freq - c->center_freq1)/20; /* n_P40 */ tmp /= 2; /* freq_P40 */ *pri40 = c->center_freq1 - 20 + 40 * tmp; break; case NL80211_CHAN_WIDTH_160: /* n_P20 */ tmp = (70 + c->chan->center_freq - c->center_freq1)/20; /* n_P40 */ tmp /= 2; /* freq_P40 */ *pri40 = c->center_freq1 - 60 + 40 * tmp; /* n_P80 */ tmp /= 2; *pri80 = c->center_freq1 - 40 + 80 * tmp; break; default: WARN_ON_ONCE(1); } } const struct cfg80211_chan_def * cfg80211_chandef_compatible(const struct cfg80211_chan_def *c1, const struct cfg80211_chan_def *c2) { u32 c1_pri40, c1_pri80, c2_pri40, c2_pri80; /* If they are identical, return */ if (cfg80211_chandef_identical(c1, c2)) return c1; /* otherwise, must have same control channel */ if (c1->chan != c2->chan) return NULL; /* * If they have the same width, but aren't identical, * then they can't be compatible. */ if (c1->width == c2->width) return NULL; /* * can't be compatible if one of them is 5 or 10 MHz, * but they don't have the same width. */ if (c1->width == NL80211_CHAN_WIDTH_5 || c1->width == NL80211_CHAN_WIDTH_10 || c2->width == NL80211_CHAN_WIDTH_5 || c2->width == NL80211_CHAN_WIDTH_10) return NULL; if (c1->width == NL80211_CHAN_WIDTH_20_NOHT || c1->width == NL80211_CHAN_WIDTH_20) return c2; if (c2->width == NL80211_CHAN_WIDTH_20_NOHT || c2->width == NL80211_CHAN_WIDTH_20) return c1; chandef_primary_freqs(c1, &c1_pri40, &c1_pri80); chandef_primary_freqs(c2, &c2_pri40, &c2_pri80); if (c1_pri40 != c2_pri40) return NULL; WARN_ON(!c1_pri80 && !c2_pri80); if (c1_pri80 && c2_pri80 && c1_pri80 != c2_pri80) return NULL; if (c1->width > c2->width) return c1; return c2; } EXPORT_SYMBOL(cfg80211_chandef_compatible); static void cfg80211_set_chans_dfs_state(struct wiphy *wiphy, u32 center_freq, u32 bandwidth, enum nl80211_dfs_state dfs_state) { struct ieee80211_channel *c; u32 freq; for (freq = center_freq - bandwidth/2 + 10; freq <= center_freq + bandwidth/2 - 10; freq += 20) { c = ieee80211_get_channel(wiphy, freq); if (!c || !(c->flags & IEEE80211_CHAN_RADAR)) continue; c->dfs_state = dfs_state; c->dfs_state_entered = jiffies; } } void cfg80211_set_dfs_state(struct wiphy *wiphy, const struct cfg80211_chan_def *chandef, enum nl80211_dfs_state dfs_state) { int width; if (WARN_ON(!cfg80211_chandef_valid(chandef))) return; width = cfg80211_chandef_get_width(chandef); if (width < 0) return; cfg80211_set_chans_dfs_state(wiphy, chandef->center_freq1, width, dfs_state); if (!chandef->center_freq2) return; cfg80211_set_chans_dfs_state(wiphy, chandef->center_freq2, width, dfs_state); } static u32 cfg80211_get_start_freq(u32 center_freq, u32 bandwidth) { u32 start_freq; bandwidth = MHZ_TO_KHZ(bandwidth); if (bandwidth <= MHZ_TO_KHZ(20)) start_freq = center_freq; else start_freq = center_freq - bandwidth / 2 + MHZ_TO_KHZ(10); return start_freq; } static u32 cfg80211_get_end_freq(u32 center_freq, u32 bandwidth) { u32 end_freq; bandwidth = MHZ_TO_KHZ(bandwidth); if (bandwidth <= MHZ_TO_KHZ(20)) end_freq = center_freq; else end_freq = center_freq + bandwidth / 2 - MHZ_TO_KHZ(10); return end_freq; } static int cfg80211_get_chans_dfs_required(struct wiphy *wiphy, u32 center_freq, u32 bandwidth) { struct ieee80211_channel *c; u32 freq, start_freq, end_freq; start_freq = cfg80211_get_start_freq(center_freq, bandwidth); end_freq = cfg80211_get_end_freq(center_freq, bandwidth); for (freq = start_freq; freq <= end_freq; freq += MHZ_TO_KHZ(20)) { c = ieee80211_get_channel_khz(wiphy, freq); if (!c) return -EINVAL; if (c->flags & IEEE80211_CHAN_RADAR) return 1; } return 0; } int cfg80211_chandef_dfs_required(struct wiphy *wiphy, const struct cfg80211_chan_def *chandef, enum nl80211_iftype iftype) { int width; int ret; if (WARN_ON(!cfg80211_chandef_valid(chandef))) return -EINVAL; switch (iftype) { case NL80211_IFTYPE_ADHOC: case NL80211_IFTYPE_AP: case NL80211_IFTYPE_P2P_GO: case NL80211_IFTYPE_MESH_POINT: width = cfg80211_chandef_get_width(chandef); if (width < 0) return -EINVAL; ret = cfg80211_get_chans_dfs_required(wiphy, ieee80211_chandef_to_khz(chandef), width); if (ret < 0) return ret; else if (ret > 0) return BIT(chandef->width); if (!chandef->center_freq2) return 0; ret = cfg80211_get_chans_dfs_required(wiphy, MHZ_TO_KHZ(chandef->center_freq2), width); if (ret < 0) return ret; else if (ret > 0) return BIT(chandef->width); break; case NL80211_IFTYPE_STATION: case NL80211_IFTYPE_OCB: case NL80211_IFTYPE_P2P_CLIENT: case NL80211_IFTYPE_MONITOR: case NL80211_IFTYPE_AP_VLAN: case NL80211_IFTYPE_WDS: case NL80211_IFTYPE_P2P_DEVICE: case NL80211_IFTYPE_NAN: break; case NL80211_IFTYPE_UNSPECIFIED: case NUM_NL80211_IFTYPES: WARN_ON(1); } return 0; } EXPORT_SYMBOL(cfg80211_chandef_dfs_required); static int cfg80211_get_chans_dfs_usable(struct wiphy *wiphy, u32 center_freq, u32 bandwidth) { struct ieee80211_channel *c; u32 freq, start_freq, end_freq; int count = 0; start_freq = cfg80211_get_start_freq(center_freq, bandwidth); end_freq = cfg80211_get_end_freq(center_freq, bandwidth); /* * Check entire range of channels for the bandwidth. * Check all channels are DFS channels (DFS_USABLE or * DFS_AVAILABLE). Return number of usable channels * (require CAC). Allow DFS and non-DFS channel mix. */ for (freq = start_freq; freq <= end_freq; freq += MHZ_TO_KHZ(20)) { c = ieee80211_get_channel_khz(wiphy, freq); if (!c) return -EINVAL; if (c->flags & IEEE80211_CHAN_DISABLED) return -EINVAL; if (c->flags & IEEE80211_CHAN_RADAR) { if (c->dfs_state == NL80211_DFS_UNAVAILABLE) return -EINVAL; if (c->dfs_state == NL80211_DFS_USABLE) count++; } } return count; } bool cfg80211_chandef_dfs_usable(struct wiphy *wiphy, const struct cfg80211_chan_def *chandef) { int width; int r1, r2 = 0; if (WARN_ON(!cfg80211_chandef_valid(chandef))) return false; width = cfg80211_chandef_get_width(chandef); if (width < 0) return false; r1 = cfg80211_get_chans_dfs_usable(wiphy, MHZ_TO_KHZ(chandef->center_freq1), width); if (r1 < 0) return false; switch (chandef->width) { case NL80211_CHAN_WIDTH_80P80: WARN_ON(!chandef->center_freq2); r2 = cfg80211_get_chans_dfs_usable(wiphy, MHZ_TO_KHZ(chandef->center_freq2), width); if (r2 < 0) return false; break; default: WARN_ON(chandef->center_freq2); break; } return (r1 + r2 > 0); } /* * Checks if center frequency of chan falls with in the bandwidth * range of chandef. */ bool cfg80211_is_sub_chan(struct cfg80211_chan_def *chandef, struct ieee80211_channel *chan) { int width; u32 freq; if (chandef->chan->center_freq == chan->center_freq) return true; width = cfg80211_chandef_get_width(chandef); if (width <= 20) return false; for (freq = chandef->center_freq1 - width / 2 + 10; freq <= chandef->center_freq1 + width / 2 - 10; freq += 20) { if (chan->center_freq == freq) return true; } if (!chandef->center_freq2) return false; for (freq = chandef->center_freq2 - width / 2 + 10; freq <= chandef->center_freq2 + width / 2 - 10; freq += 20) { if (chan->center_freq == freq) return true; } return false; } bool cfg80211_beaconing_iface_active(struct wireless_dev *wdev) { bool active = false; ASSERT_WDEV_LOCK(wdev); if (!wdev->chandef.chan) return false; switch (wdev->iftype) { case NL80211_IFTYPE_AP: case NL80211_IFTYPE_P2P_GO: active = wdev->beacon_interval != 0; break; case NL80211_IFTYPE_ADHOC: active = wdev->ssid_len != 0; break; case NL80211_IFTYPE_MESH_POINT: active = wdev->mesh_id_len != 0; break; case NL80211_IFTYPE_STATION: case NL80211_IFTYPE_OCB: case NL80211_IFTYPE_P2P_CLIENT: case NL80211_IFTYPE_MONITOR: case NL80211_IFTYPE_AP_VLAN: case NL80211_IFTYPE_WDS: case NL80211_IFTYPE_P2P_DEVICE: /* Can NAN type be considered as beaconing interface? */ case NL80211_IFTYPE_NAN: break; case NL80211_IFTYPE_UNSPECIFIED: case NUM_NL80211_IFTYPES: WARN_ON(1); } return active; } static bool cfg80211_is_wiphy_oper_chan(struct wiphy *wiphy, struct ieee80211_channel *chan) { struct wireless_dev *wdev; list_for_each_entry(wdev, &wiphy->wdev_list, list) { wdev_lock(wdev); if (!cfg80211_beaconing_iface_active(wdev)) { wdev_unlock(wdev); continue; } if (cfg80211_is_sub_chan(&wdev->chandef, chan)) { wdev_unlock(wdev); return true; } wdev_unlock(wdev); } return false; } bool cfg80211_any_wiphy_oper_chan(struct wiphy *wiphy, struct ieee80211_channel *chan) { struct cfg80211_registered_device *rdev; ASSERT_RTNL(); if (!(chan->flags & IEEE80211_CHAN_RADAR)) return false; list_for_each_entry(rdev, &cfg80211_rdev_list, list) { if (!reg_dfs_domain_same(wiphy, &rdev->wiphy)) continue; if (cfg80211_is_wiphy_oper_chan(&rdev->wiphy, chan)) return true; } return false; } static bool cfg80211_get_chans_dfs_available(struct wiphy *wiphy, u32 center_freq, u32 bandwidth) { struct ieee80211_channel *c; u32 freq, start_freq, end_freq; bool dfs_offload; dfs_offload = wiphy_ext_feature_isset(wiphy, NL80211_EXT_FEATURE_DFS_OFFLOAD); start_freq = cfg80211_get_start_freq(center_freq, bandwidth); end_freq = cfg80211_get_end_freq(center_freq, bandwidth); /* * Check entire range of channels for the bandwidth. * If any channel in between is disabled or has not * had gone through CAC return false */ for (freq = start_freq; freq <= end_freq; freq += MHZ_TO_KHZ(20)) { c = ieee80211_get_channel_khz(wiphy, freq); if (!c) return false; if (c->flags & IEEE80211_CHAN_DISABLED) return false; if ((c->flags & IEEE80211_CHAN_RADAR) && (c->dfs_state != NL80211_DFS_AVAILABLE) && !(c->dfs_state == NL80211_DFS_USABLE && dfs_offload)) return false; } return true; } static bool cfg80211_chandef_dfs_available(struct wiphy *wiphy, const struct cfg80211_chan_def *chandef) { int width; int r; if (WARN_ON(!cfg80211_chandef_valid(chandef))) return false; width = cfg80211_chandef_get_width(chandef); if (width < 0) return false; r = cfg80211_get_chans_dfs_available(wiphy, MHZ_TO_KHZ(chandef->center_freq1), width); /* If any of channels unavailable for cf1 just return */ if (!r) return r; switch (chandef->width) { case NL80211_CHAN_WIDTH_80P80: WARN_ON(!chandef->center_freq2); r = cfg80211_get_chans_dfs_available(wiphy, MHZ_TO_KHZ(chandef->center_freq2), width); break; default: WARN_ON(chandef->center_freq2); break; } return r; } static unsigned int cfg80211_get_chans_dfs_cac_time(struct wiphy *wiphy, u32 center_freq, u32 bandwidth) { struct ieee80211_channel *c; u32 start_freq, end_freq, freq; unsigned int dfs_cac_ms = 0; start_freq = cfg80211_get_start_freq(center_freq, bandwidth); end_freq = cfg80211_get_end_freq(center_freq, bandwidth); for (freq = start_freq; freq <= end_freq; freq += MHZ_TO_KHZ(20)) { c = ieee80211_get_channel_khz(wiphy, freq); if (!c) return 0; if (c->flags & IEEE80211_CHAN_DISABLED) return 0; if (!(c->flags & IEEE80211_CHAN_RADAR)) continue; if (c->dfs_cac_ms > dfs_cac_ms) dfs_cac_ms = c->dfs_cac_ms; } return dfs_cac_ms; } unsigned int cfg80211_chandef_dfs_cac_time(struct wiphy *wiphy, const struct cfg80211_chan_def *chandef) { int width; unsigned int t1 = 0, t2 = 0; if (WARN_ON(!cfg80211_chandef_valid(chandef))) return 0; width = cfg80211_chandef_get_width(chandef); if (width < 0) return 0; t1 = cfg80211_get_chans_dfs_cac_time(wiphy, MHZ_TO_KHZ(chandef->center_freq1), width); if (!chandef->center_freq2) return t1; t2 = cfg80211_get_chans_dfs_cac_time(wiphy, MHZ_TO_KHZ(chandef->center_freq2), width); return max(t1, t2); } static bool cfg80211_secondary_chans_ok(struct wiphy *wiphy, u32 center_freq, u32 bandwidth, u32 prohibited_flags) { struct ieee80211_channel *c; u32 freq, start_freq, end_freq; start_freq = cfg80211_get_start_freq(center_freq, bandwidth); end_freq = cfg80211_get_end_freq(center_freq, bandwidth); for (freq = start_freq; freq <= end_freq; freq += MHZ_TO_KHZ(20)) { c = ieee80211_get_channel_khz(wiphy, freq); if (!c || c->flags & prohibited_flags) return false; } return true; } /* check if the operating channels are valid and supported */ static bool cfg80211_edmg_usable(struct wiphy *wiphy, u8 edmg_channels, enum ieee80211_edmg_bw_config edmg_bw_config, int primary_channel, struct ieee80211_edmg *edmg_cap) { struct ieee80211_channel *chan; int i, freq; int channels_counter = 0; if (!edmg_channels && !edmg_bw_config) return true; if ((!edmg_channels && edmg_bw_config) || (edmg_channels && !edmg_bw_config)) return false; if (!(edmg_channels & BIT(primary_channel - 1))) return false; /* 60GHz channels 1..6 */ for (i = 0; i < 6; i++) { if (!(edmg_channels & BIT(i))) continue; if (!(edmg_cap->channels & BIT(i))) return false; channels_counter++; freq = ieee80211_channel_to_frequency(i + 1, NL80211_BAND_60GHZ); chan = ieee80211_get_channel(wiphy, freq); if (!chan || chan->flags & IEEE80211_CHAN_DISABLED) return false; } /* IEEE802.11 allows max 4 channels */ if (channels_counter > 4) return false; /* check bw_config is a subset of what driver supports * (see IEEE P802.11ay/D4.0 section 9.4.2.251, Table 13) */ if ((edmg_bw_config % 4) > (edmg_cap->bw_config % 4)) return false; if (edmg_bw_config > edmg_cap->bw_config) return false; return true; } bool cfg80211_chandef_usable(struct wiphy *wiphy, const struct cfg80211_chan_def *chandef, u32 prohibited_flags) { struct ieee80211_sta_ht_cap *ht_cap; struct ieee80211_sta_vht_cap *vht_cap; struct ieee80211_edmg *edmg_cap; u32 width, control_freq, cap; bool support_80_80 = false; if (WARN_ON(!cfg80211_chandef_valid(chandef))) return false; ht_cap = &wiphy->bands[chandef->chan->band]->ht_cap; vht_cap = &wiphy->bands[chandef->chan->band]->vht_cap; edmg_cap = &wiphy->bands[chandef->chan->band]->edmg_cap; if (edmg_cap->channels && !cfg80211_edmg_usable(wiphy, chandef->edmg.channels, chandef->edmg.bw_config, chandef->chan->hw_value, edmg_cap)) return false; control_freq = chandef->chan->center_freq; switch (chandef->width) { case NL80211_CHAN_WIDTH_1: width = 1; break; case NL80211_CHAN_WIDTH_2: width = 2; break; case NL80211_CHAN_WIDTH_4: width = 4; break; case NL80211_CHAN_WIDTH_8: width = 8; break; case NL80211_CHAN_WIDTH_16: width = 16; break; case NL80211_CHAN_WIDTH_5: width = 5; break; case NL80211_CHAN_WIDTH_10: prohibited_flags |= IEEE80211_CHAN_NO_10MHZ; width = 10; break; case NL80211_CHAN_WIDTH_20: if (!ht_cap->ht_supported && chandef->chan->band != NL80211_BAND_6GHZ) return false; fallthrough; case NL80211_CHAN_WIDTH_20_NOHT: prohibited_flags |= IEEE80211_CHAN_NO_20MHZ; width = 20; break; case NL80211_CHAN_WIDTH_40: width = 40; if (chandef->chan->band == NL80211_BAND_6GHZ) break; if (!ht_cap->ht_supported) return false; if (!(ht_cap->cap & IEEE80211_HT_CAP_SUP_WIDTH_20_40) || ht_cap->cap & IEEE80211_HT_CAP_40MHZ_INTOLERANT) return false; if (chandef->center_freq1 < control_freq && chandef->chan->flags & IEEE80211_CHAN_NO_HT40MINUS) return false; if (chandef->center_freq1 > control_freq && chandef->chan->flags & IEEE80211_CHAN_NO_HT40PLUS) return false; break; case NL80211_CHAN_WIDTH_80P80: cap = vht_cap->cap; support_80_80 = (cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ) || (cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ && cap & IEEE80211_VHT_CAP_EXT_NSS_BW_MASK) || u32_get_bits(cap, IEEE80211_VHT_CAP_EXT_NSS_BW_MASK) > 1; if (chandef->chan->band != NL80211_BAND_6GHZ && !support_80_80) return false; fallthrough; case NL80211_CHAN_WIDTH_80: prohibited_flags |= IEEE80211_CHAN_NO_80MHZ; width = 80; if (chandef->chan->band == NL80211_BAND_6GHZ) break; if (!vht_cap->vht_supported) return false; break; case NL80211_CHAN_WIDTH_160: prohibited_flags |= IEEE80211_CHAN_NO_160MHZ; width = 160; if (chandef->chan->band == NL80211_BAND_6GHZ) break; if (!vht_cap->vht_supported) return false; cap = vht_cap->cap & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK; if (cap != IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160MHZ && cap != IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ && !(vht_cap->cap & IEEE80211_VHT_CAP_EXT_NSS_BW_MASK)) return false; break; default: WARN_ON_ONCE(1); return false; } /* * TODO: What if there are only certain 80/160/80+80 MHz channels * allowed by the driver, or only certain combinations? * For 40 MHz the driver can set the NO_HT40 flags, but for * 80/160 MHz and in particular 80+80 MHz this isn't really * feasible and we only have NO_80MHZ/NO_160MHZ so far but * no way to cover 80+80 MHz or more complex restrictions. * Note that such restrictions also need to be advertised to * userspace, for example for P2P channel selection. */ if (width > 20) prohibited_flags |= IEEE80211_CHAN_NO_OFDM; /* 5 and 10 MHz are only defined for the OFDM PHY */ if (width < 20) prohibited_flags |= IEEE80211_CHAN_NO_OFDM; if (!cfg80211_secondary_chans_ok(wiphy, ieee80211_chandef_to_khz(chandef), width, prohibited_flags)) return false; if (!chandef->center_freq2) return true; return cfg80211_secondary_chans_ok(wiphy, MHZ_TO_KHZ(chandef->center_freq2), width, prohibited_flags); } EXPORT_SYMBOL(cfg80211_chandef_usable); /* * Check if the channel can be used under permissive conditions mandated by * some regulatory bodies, i.e., the channel is marked with * IEEE80211_CHAN_IR_CONCURRENT and there is an additional station interface * associated to an AP on the same channel or on the same UNII band * (assuming that the AP is an authorized master). * In addition allow operation on a channel on which indoor operation is * allowed, iff we are currently operating in an indoor environment. */ static bool cfg80211_ir_permissive_chan(struct wiphy *wiphy, enum nl80211_iftype iftype, struct ieee80211_channel *chan) { struct wireless_dev *wdev; struct cfg80211_registered_device *rdev = wiphy_to_rdev(wiphy); ASSERT_RTNL(); if (!IS_ENABLED(CONFIG_CFG80211_REG_RELAX_NO_IR) || !(wiphy->regulatory_flags & REGULATORY_ENABLE_RELAX_NO_IR)) return false; /* only valid for GO and TDLS off-channel (station/p2p-CL) */ if (iftype != NL80211_IFTYPE_P2P_GO && iftype != NL80211_IFTYPE_STATION && iftype != NL80211_IFTYPE_P2P_CLIENT) return false; if (regulatory_indoor_allowed() && (chan->flags & IEEE80211_CHAN_INDOOR_ONLY)) return true; if (!(chan->flags & IEEE80211_CHAN_IR_CONCURRENT)) return false; /* * Generally, it is possible to rely on another device/driver to allow * the IR concurrent relaxation, however, since the device can further * enforce the relaxation (by doing a similar verifications as this), * and thus fail the GO instantiation, consider only the interfaces of * the current registered device. */ list_for_each_entry(wdev, &rdev->wiphy.wdev_list, list) { struct ieee80211_channel *other_chan = NULL; int r1, r2; wdev_lock(wdev); if (wdev->iftype == NL80211_IFTYPE_STATION && wdev->current_bss) other_chan = wdev->current_bss->pub.channel; /* * If a GO already operates on the same GO_CONCURRENT channel, * this one (maybe the same one) can beacon as well. We allow * the operation even if the station we relied on with * GO_CONCURRENT is disconnected now. But then we must make sure * we're not outdoor on an indoor-only channel. */ if (iftype == NL80211_IFTYPE_P2P_GO && wdev->iftype == NL80211_IFTYPE_P2P_GO && wdev->beacon_interval && !(chan->flags & IEEE80211_CHAN_INDOOR_ONLY)) other_chan = wdev->chandef.chan; wdev_unlock(wdev); if (!other_chan) continue; if (chan == other_chan) return true; if (chan->band != NL80211_BAND_5GHZ && chan->band != NL80211_BAND_6GHZ) continue; r1 = cfg80211_get_unii(chan->center_freq); r2 = cfg80211_get_unii(other_chan->center_freq); if (r1 != -EINVAL && r1 == r2) { /* * At some locations channels 149-165 are considered a * bundle, but at other locations, e.g., Indonesia, * channels 149-161 are considered a bundle while * channel 165 is left out and considered to be in a * different bundle. Thus, in case that there is a * station interface connected to an AP on channel 165, * it is assumed that channels 149-161 are allowed for * GO operations. However, having a station interface * connected to an AP on channels 149-161, does not * allow GO operation on channel 165. */ if (chan->center_freq == 5825 && other_chan->center_freq != 5825) continue; return true; } } return false; } static bool _cfg80211_reg_can_beacon(struct wiphy *wiphy, struct cfg80211_chan_def *chandef, enum nl80211_iftype iftype, bool check_no_ir) { bool res; u32 prohibited_flags = IEEE80211_CHAN_DISABLED | IEEE80211_CHAN_RADAR; trace_cfg80211_reg_can_beacon(wiphy, chandef, iftype, check_no_ir); if (check_no_ir) prohibited_flags |= IEEE80211_CHAN_NO_IR; if (cfg80211_chandef_dfs_required(wiphy, chandef, iftype) > 0 && cfg80211_chandef_dfs_available(wiphy, chandef)) { /* We can skip IEEE80211_CHAN_NO_IR if chandef dfs available */ prohibited_flags = IEEE80211_CHAN_DISABLED; } res = cfg80211_chandef_usable(wiphy, chandef, prohibited_flags); trace_cfg80211_return_bool(res); return res; } bool cfg80211_reg_can_beacon(struct wiphy *wiphy, struct cfg80211_chan_def *chandef, enum nl80211_iftype iftype) { return _cfg80211_reg_can_beacon(wiphy, chandef, iftype, true); } EXPORT_SYMBOL(cfg80211_reg_can_beacon); bool cfg80211_reg_can_beacon_relax(struct wiphy *wiphy, struct cfg80211_chan_def *chandef, enum nl80211_iftype iftype) { bool check_no_ir; ASSERT_RTNL(); /* * Under certain conditions suggested by some regulatory bodies a * GO/STA can IR on channels marked with IEEE80211_NO_IR. Set this flag * only if such relaxations are not enabled and the conditions are not * met. */ check_no_ir = !cfg80211_ir_permissive_chan(wiphy, iftype, chandef->chan); return _cfg80211_reg_can_beacon(wiphy, chandef, iftype, check_no_ir); } EXPORT_SYMBOL(cfg80211_reg_can_beacon_relax); int cfg80211_set_monitor_channel(struct cfg80211_registered_device *rdev, struct cfg80211_chan_def *chandef) { if (!rdev->ops->set_monitor_channel) return -EOPNOTSUPP; if (!cfg80211_has_monitors_only(rdev)) return -EBUSY; return rdev_set_monitor_channel(rdev, chandef); } void cfg80211_get_chan_state(struct wireless_dev *wdev, struct ieee80211_channel **chan, enum cfg80211_chan_mode *chanmode, u8 *radar_detect) { int ret; *chan = NULL; *chanmode = CHAN_MODE_UNDEFINED; ASSERT_WDEV_LOCK(wdev); if (wdev->netdev && !netif_running(wdev->netdev)) return; switch (wdev->iftype) { case NL80211_IFTYPE_ADHOC: if (wdev->current_bss) { *chan = wdev->current_bss->pub.channel; *chanmode = (wdev->ibss_fixed && !wdev->ibss_dfs_possible) ? CHAN_MODE_SHARED : CHAN_MODE_EXCLUSIVE; /* consider worst-case - IBSS can try to return to the * original user-specified channel as creator */ if (wdev->ibss_dfs_possible) *radar_detect |= BIT(wdev->chandef.width); return; } break; case NL80211_IFTYPE_STATION: case NL80211_IFTYPE_P2P_CLIENT: if (wdev->current_bss) { *chan = wdev->current_bss->pub.channel; *chanmode = CHAN_MODE_SHARED; return; } break; case NL80211_IFTYPE_AP: case NL80211_IFTYPE_P2P_GO: if (wdev->cac_started) { *chan = wdev->chandef.chan; *chanmode = CHAN_MODE_SHARED; *radar_detect |= BIT(wdev->chandef.width); } else if (wdev->beacon_interval) { *chan = wdev->chandef.chan; *chanmode = CHAN_MODE_SHARED; ret = cfg80211_chandef_dfs_required(wdev->wiphy, &wdev->chandef, wdev->iftype); WARN_ON(ret < 0); if (ret > 0) *radar_detect |= BIT(wdev->chandef.width); } return; case NL80211_IFTYPE_MESH_POINT: if (wdev->mesh_id_len) { *chan = wdev->chandef.chan; *chanmode = CHAN_MODE_SHARED; ret = cfg80211_chandef_dfs_required(wdev->wiphy, &wdev->chandef, wdev->iftype); WARN_ON(ret < 0); if (ret > 0) *radar_detect |= BIT(wdev->chandef.width); } return; case NL80211_IFTYPE_OCB: if (wdev->chandef.chan) { *chan = wdev->chandef.chan; *chanmode = CHAN_MODE_SHARED; return; } break; case NL80211_IFTYPE_MONITOR: case NL80211_IFTYPE_AP_VLAN: case NL80211_IFTYPE_WDS: case NL80211_IFTYPE_P2P_DEVICE: case NL80211_IFTYPE_NAN: /* these interface types don't really have a channel */ return; case NL80211_IFTYPE_UNSPECIFIED: case NUM_NL80211_IFTYPES: WARN_ON(1); } }