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Release 4.8 net/wireless/chan.c

Directory: net/wireless
/*
 * 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 <johannes@sipsolutions.net>
 * Copyright 2013-2014  Intel Mobile Communications GmbH
 */

#include <linux/export.h>
#include <net/cfg80211.h>
#include "core.h"
#include "rdev-ops.h"


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->center_freq2 = 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); } }

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EXPORT_SYMBOL(cfg80211_chandef_create);
bool cfg80211_chandef_valid(const struct cfg80211_chan_def *chandef) { u32 control_freq; if (!chandef->chan) return false; control_freq = chandef->chan->center_freq; switch (chandef->width) { case NL80211_CHAN_WIDTH_5: case NL80211_CHAN_WIDTH_10: case NL80211_CHAN_WIDTH_20: case NL80211_CHAN_WIDTH_20_NOHT: if (chandef->center_freq1 != control_freq) return false; if (chandef->center_freq2) 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; } return true; }

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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); } }

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static int cfg80211_chandef_get_width(const struct cfg80211_chan_def *c) { int width; switch (c->width) { case NL80211_CHAN_WIDTH_5: width = 5; break; case NL80211_CHAN_WIDTH_10: width = 10; break; case NL80211_CHAN_WIDTH_20: case NL80211_CHAN_WIDTH_20_NOHT: width = 20; break; case NL80211_CHAN_WIDTH_40: width = 40; break; case NL80211_CHAN_WIDTH_80P80: case NL80211_CHAN_WIDTH_80: width = 80; break; case NL80211_CHAN_WIDTH_160: width = 160; break; default: WARN_ON_ONCE(1); return -1; } return width; }

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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; }

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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; } }

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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); }

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static u32 cfg80211_get_start_freq(u32 center_freq, u32 bandwidth) { u32 start_freq; if (bandwidth <= 20) start_freq = center_freq; else start_freq = center_freq - bandwidth/2 + 10; return start_freq; }

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static u32 cfg80211_get_end_freq(u32 center_freq, u32 bandwidth) { u32 end_freq; if (bandwidth <= 20) end_freq = center_freq; else end_freq = center_freq + bandwidth/2 - 10; return end_freq; }

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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 += 20) { c = ieee80211_get_channel(wiphy, freq); if (!c) return -EINVAL; if (c->flags & IEEE80211_CHAN_RADAR) return 1; } return 0; }

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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, chandef->center_freq1, 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, 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: break; case NL80211_IFTYPE_UNSPECIFIED: case NUM_NL80211_IFTYPES: WARN_ON(1); } return 0; }

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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 += 20) { c = ieee80211_get_channel(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; }

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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, 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, chandef->center_freq2, width); if (r2 < 0) return false; break; default: WARN_ON(chandef->center_freq2); break; } return (r1 + r2 > 0); }

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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; 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 += 20) { c = ieee80211_get_channel(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)) return false; } return true; }

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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, 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, chandef->center_freq2, width); break; default: WARN_ON(chandef->center_freq2); break; } return r; }

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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 += 20) { c = ieee80211_get_channel(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; }

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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, chandef->center_freq1, width); if (!chandef->center_freq2) return t1; t2 = cfg80211_get_chans_dfs_cac_time(wiphy, chandef->center_freq2, width); return max(t1, t2); }

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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 += 20) { c = ieee80211_get_channel(wiphy, freq); if (!c || c->flags & prohibited_flags) return false; } return true; }

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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; u32 width, control_freq, cap; 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; control_freq = chandef->chan->center_freq; switch (chandef->width) { 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) return false; case NL80211_CHAN_WIDTH_20_NOHT: prohibited_flags |= IEEE80211_CHAN_NO_20MHZ; width = 20; break; case NL80211_CHAN_WIDTH_40: width = 40; 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 & IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_MASK; if (cap != IEEE80211_VHT_CAP_SUPP_CHAN_WIDTH_160_80PLUS80MHZ) return false; case NL80211_CHAN_WIDTH_80: if (!vht_cap->vht_supported) return false; prohibited_flags |= IEEE80211_CHAN_NO_80MHZ; width = 80; break; case NL80211_CHAN_WIDTH_160: 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) return false; prohibited_flags |= IEEE80211_CHAN_NO_160MHZ; width = 160; 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, chandef->center_freq1, width, prohibited_flags)) return false; if (!chandef->center_freq2) return true; return cfg80211_secondary_chans_ok(wiphy, chandef->center_freq2, width, prohibited_flags); }

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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))