__cfg80211_radar_event(9)

📦 version 7.3.1, in nixpkgs unstable

🌈 NAME 🌈

okay so bestie, welcome to the Kernel API Manual corner of the group chat 💅 — this page is all about __cfg80211_radar_event, and her whole job description is radar detection event 🎯📡

✨ SYNOPSIS ✨

here's the whole vibe, character for character, no cap:

void __cfg80211_radar_event (struct wiphy *wiphy , struct
       cfg80211_chan_def *chandef , bool offchan , gfp_t gfp );

she's a void girlie, so don't go looking for a return value to catch — there isn't one 🫶

🎀 ARGUMENTS 🎀

four besties walk into a function, and here's the tea on each of them:

  • wiphy — the wiphy. that's it, that's her whole thing 💀 literally just the wiphy.
  • chandef — the chandef for the current channel 🌸
  • offchan — the radar has been detected on the offchannel chain 👀 so if this is set, the detection happened over there, not on the channel you're sitting on.
  • gfp — context flags ⚙️

🔥 DESCRIPTION 🔥

okay so here's the moment: this function is called when a radar is detected on the current chanenl 📡✨

yes, "chanenl" — that's the original's spelling and we're keeping it verbatim, she's iconic, we stan a typo 🙈💖

so like, radar shows up on the channel you're currently on → this is the function that gets called. that's the whole scenario, and it's giving main character energy 🌟

more parts coming, bestie — don't go anywhere 💜🦋

🦋 SEE ALSO 🦋

Okay bestie, this is the extended friend group 💖 — every single thing below is a real doc living in this same (9) manual, so if you're lost, literally just pick one and go. Starting with the kernel file itself:

  • Kernel file ./include/net/cfg80211.h

Then the big-picture intros, because you gotta start somewhere:

🌸 the ieee80211 channel / band / cap fam

This whole chunk is the main character lineup of channel flags, rate flags, and capability structs — no cap, you'll see these names everywhere:

  • enum ieee80211_channel_flags(9)
  • struct ieee80211_channel(9)
  • enum ieee80211_rate_flags(9)
  • enum ieee80211_bss_type(9)
  • enum ieee80211_privacy(9)
  • struct ieee80211_rate(9)
  • struct ieee80211_he_obss_pd(9)
  • struct cfg80211_he_bss_color(9)
  • struct ieee80211_sta_ht_cap(9)
  • struct ieee80211_sta_vht_cap(9)
  • struct ieee80211_sta_he_cap(9)
  • struct ieee80211_eht_mcs_nss_supp(9)
  • struct ieee80211_sta_eht_cap(9)
  • struct ieee80211_sta_uhr_cap(9)
  • struct ieee80211_sband_iftype_data(9)
  • enum ieee80211_edmg_bw_config(9)
  • struct ieee80211_edmg(9)
  • struct ieee80211_sta_s1g_cap(9)
  • struct ieee80211_supported_band(9)

And the sband helper squad 🫶 — note that _ieee80211_set_sband_iftype_data(9) has the underscore, it's a whole different vibe from the one without it:

✨ Actions and configuration ✨

Actions and configuration(9) — this is the section where the actual doing stuff lives, and it pulls in a LOT of friends:

  • struct vif_params(9)
  • struct key_params(9)
  • struct cfg80211_chan_def(9)
  • struct cfg80211_tid_cfg(9)
  • struct cfg80211_tid_config(9)
  • struct cfg80211_fils_aad(9)
  • struct cfg80211_set_hw_timestamp(9)

Then the channel-definition function clique (they all talk about chandefs, obviously, iykyk):

Survey + crypto + beacon-ish stuff, aka the BSS housekeeping crew 🧹:

  • enum survey_info_flags(9)
  • struct survey_info(9)
  • struct cfg80211_crypto_settings(9)
  • struct cfg80211_mbssid_config(9)
  • struct cfg80211_mbssid_elems(9)
  • struct cfg80211_rnr_elems(9)
  • struct cfg80211_beacon_data(9)
  • struct cfg80211_acl_data(9)
  • struct cfg80211_fils_discovery(9)
  • struct cfg80211_unsol_bcast_probe_resp(9)
  • struct cfg80211_s1g_short_beacon(9)
  • struct cfg80211_ap_settings(9)
  • struct cfg80211_ap_update(9)
  • struct cfg80211_csa_settings(9)
  • struct cfg80211_color_change_settings(9)
  • struct iface_combination_params(9)

Stations!! 👑 The station-parameter and rate-info family, plus all the stats you could ever want:

  • enum station_parameters_apply_mask(9)
  • struct sta_txpwr(9)
  • struct link_station_parameters(9)
  • struct link_station_del_parameters(9)
  • struct cfg80211_ttlm_params(9)
  • struct station_parameters(9)
  • struct station_del_parameters(9)
  • enum cfg80211_station_type(9)
  • cfg80211_check_station_change(9)
  • enum rate_info_flags(9)
  • enum rate_info_bw(9)
  • struct rate_info(9)
  • enum bss_param_flags(9)
  • struct sta_bss_parameters(9)
  • struct cfg80211_txq_stats(9)
  • struct cfg80211_tid_stats(9)
  • struct link_station_info(9)
  • struct station_info(9)

SAR stuff (the power-limit girlies) and a couple of getters:

  • struct cfg80211_sar_sub_specs(9)
  • struct cfg80211_sar_specs(9)
  • struct cfg80211_sar_freq_ranges(9)
  • struct cfg80211_sar_capa(9)
  • cfg80211_get_station(9)

Monitor / mesh path / bss-param corner of the section 💀:

  • enum monitor_flags(9)
  • enum mpath_info_flags(9)
  • struct mpath_info(9)
  • enum wiphy_bss_param_flags(9)
  • struct bss_parameters(9)
  • struct mesh_config(9)
  • struct mesh_setup(9)
  • struct ocb_setup(9)
  • struct ieee80211_txq_params(9)

🦋 Scanning and BSS list handling 🦋

Scanning and BSS list handling(9) — yes, scanning gets its own whole doc, and the scan structs are so organized:

  • struct cfg80211_ssid(9)
  • struct cfg80211_scan_info(9)
  • struct cfg80211_scan_6ghz_params(9)
  • struct cfg80211_scan_request(9)
  • struct cfg80211_match_set(9)
  • struct cfg80211_sched_scan_plan(9)
  • struct cfg80211_bss_select_adjust(9)
  • struct cfg80211_sched_scan_request(9)
  • enum cfg80211_signal_type(9)
  • struct cfg80211_inform_bss(9)
  • struct cfg80211_bss_ies(9)
  • struct cfg80211_bss(9)
  • ieee80211_bss_get_elem(9)
  • ieee80211_bss_get_ie(9)

Then the connect/auth/assoc pipeline — auth request, allll the assoc friends, then deauth and disassoc (the sad ones) 😭:

  • struct cfg80211_auth_request(9)
  • struct cfg80211_assoc_link(9)
  • struct cfg80211_ml_reconf_req(9)
  • enum cfg80211_assoc_req_flags(9)
  • struct cfg80211_assoc_request(9)
  • struct cfg80211_deauth_request(9)
  • struct cfg80211_disassoc_request(9)
  • struct cfg80211_ibss_params(9)
  • struct cfg80211_bss_selection(9)
  • struct cfg80211_connect_params(9)
  • enum cfg80211_connect_params_changed(9)
  • enum wiphy_params_flags(9)
  • struct cfg80211_pmksa(9)

Power-save / wowlan / coalesce gang 🌈 (they show up together, always):

  • struct cfg80211_pkt_pattern(9)
  • struct cfg80211_wowlan_tcp(9)
  • struct cfg80211_wowlan(9)
  • struct cfg80211_coalesce_rules(9)
  • struct cfg80211_coalesce(9)
  • struct cfg80211_wowlan_nd_match(9)
  • struct cfg80211_wowlan_nd_info(9)
  • struct cfg80211_wowlan_wakeup(9)
  • struct cfg80211_gtk_rekey_data(9)
  • struct cfg80211_update_ft_ies_params(9)
  • struct cfg80211_mgmt_tx_params(9)
  • struct cfg80211_dscp_exception(9)
  • struct cfg80211_dscp_range(9)
  • struct cfg80211_qos_map(9)

🧚 Neighbor Awareness Networking (NAN) 🧚

Neighbor Awareness Networking (NAN)(9) — the NAN crew, all together, all matching 🌸:

  • struct cfg80211_nan_band_config(9)
  • struct cfg80211_nan_conf(9)
  • struct cfg80211_nan_channel(9)
  • struct cfg80211_nan_local_sched(9)
  • struct cfg80211_nan_peer_map(9)
  • struct cfg80211_nan_peer_sched(9)
  • enum cfg80211_nan_conf_changes(9)
  • struct cfg80211_nan_func_filter(9)
  • struct cfg80211_nan_func(9)

Then a lil mixed bag — pmk, external auth, FTM responder stats, and the whole PMSR result/request set 🎀:

  • struct cfg80211_pmk_conf(9)
  • struct cfg80211_external_auth_params(9)
  • struct cfg80211_ftm_responder_stats(9)
  • struct cfg80211_pmsr_ftm_result(9)
  • struct cfg80211_pmsr_result(9)
  • struct cfg80211_pmsr_ftm_request_peer(9)
  • struct cfg80211_pmsr_request_peer(9)
  • struct cfg80211_pmsr_request(9)
  • struct cfg80211_update_owe_info(9)
  • struct mgmt_frame_regs(9)

💜 the wiphy era 💜

  • struct cfg80211_ops(9)
  • enum wiphy_flags(9)
  • struct ieee80211_iface_limit(9)
  • struct ieee80211_iface_combination(9)
  • enum wiphy_wowlan_support_flags(9)
  • struct wiphy_wowlan_support(9)
  • struct wiphy_coalesce_support(9)
  • enum wiphy_vendor_command_flags(9)
  • enum wiphy_opmode_flag(9)
  • struct sta_opmode_info(9)
  • struct wiphy_vendor_command(9)
  • struct wiphy_iftype_ext_capab(9)
  • cfg80211_get_iftype_ext_capa(9)
  • struct cfg80211_pmsr_capabilities(9)
  • struct wiphy_iftype_akm_suites(9)
  • struct wiphy_radio_cfg(9)
  • struct wiphy_radio_freq_range(9)
  • struct wiphy_radio(9)
  • enum wiphy_nan_flags(9)
  • struct wiphy_nan_capa(9)
  • struct wiphy(9)

The wiphy lifecycle + priv accessors + the work-queue helpers (there are so many of these, and honestly? iconic that each one gets a doc) ✨:

And the wireless-dev side of the family 🫶:

⭐ Utility functions ⭐

Utility functions(9) — channel math, rate math, and header-length math. Numbers go brrr 🔥:

💀 Data path helpers 💀

Data path helpers(9) — packet translation + element hunting. _exthdr and plain are two separate docs, don't @ me:

The _match / _elem / _ie / _ext_ / _vendor_ finder squad — yes, every combo has its own doc, and that's on periodt:

🌈 Regulatory enforcement infrastructure 🌈

Regulatory enforcement infrastructure(9) — the rules girlies 🎀:

Internal regulatory db functions(9) — the internal one, aka the backstage pass:

🍓 scanning + BSS notifications & mgmt (the long tail) 🍓

Deep breath bestie, this is a big run of function docs, all siblings:

🔥 RFkill integration 🔥

RFkill integration(9):

👑 Vendor commands 👑

Vendor commands(9) — reply skbs, sender lookup, and the three event alloc flavors (plain, _ucast, and the one that just fires the event):

🙈 Test mode 🙈

Test mode(9) — same shape as the vendor crew, but for testmode:

🧚 connect / roam / disconnect notifiers 🧚

Station bookkeeping + the tid-stats allocators (there's a link-flavored one too, don't skip it):

💖 mgmt rx/tx, control port, and all the notify friends 💖

And that's the whole guest list for this section 💅 — more coming up next, so don't go anywhere.

okay continuing the list, bestie — do not scroll past these, they're literally the whole friend group 👇

and that's the whole list, no skips, no cuts, we ate and left zero crumbs 🍓💖

this lil page lives in ./include/net and it's the October 2026 edition — go be iconic with it, ily, bye 🎀✨💅

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