ieee80211_f...z_to_channel(9)

💅 ieee80211_f...z_to_channel — yeah that's the whole name, it's giving "truncated by the terminal and we're just living with it" ✨

okay so real talk, this page lives in the Kernel API Manual, section 9, and the header at the top literally reads ieee80211_f...z_to_channel(9) — that's not me being lazy, that's just what happens when a function name is too iconic for the column width 💀 anyway. bestie. come sit. we're doing a frequency-to-channel conversion and it's actually so simple you'll be obsessed.

✨ NAME ✨

ieee80211_freq_khz_to_channel — convert frequency to channel number 🎀

like, that's it. that's the whole job. you hand it a frequency, it hands you back the channel. matchmaker behavior honestly 🫶

🌸 SYNOPSIS 🌸

int ieee80211_freq_khz_to_channel (u32 freq );

so you call it, you pass it a u32 called freq, and you get an int back. no cap, no surprises, no twelve-argument monstrosity. we love a low-maintenance function 💖

🦋 ARGUMENTS 🦋

freq — center frequency in KHz ⭐ legit just the center frequency, measured in KHz. that's the only thing it wants from you. one (1) single number. she's lowkey uncomplicated like that 🌈

heads up: the units are KHz, not Hz, not MHz. don't come at her with megahertz and expect magic, iykyk 🙈

👑 RETURN 👑

returns the corresponding channel, or 0 if the conversion failed 💀

so like — bestie, listen — when you get a 0 back, that is not channel zero, that's the "nope, couldn't do it" signal. treat it accordingly fr fr. the 0 is a failure flag, not a channel number, and conflating the two is exactly the kind of vibe check fail we're avoiding here ✨

okay and that's genuinely the entire surface of this function — but there's more page coming, so don't go anywhere 🧚💜

💖 SEE ALSO 💖

okay bestie, buckle up, because this is the part where the page hands you the entire friend group 🫶. Every single one of these is a real page you can go read, and they're all sitting in (9) — the Kernel API section, iykyk.

First up, the home base itself:

Kernel file ./include/net/cfg80211.h

Then the orientation vibes — start here if you're new here:

Introduction(9), Device registration(9)

Now the channel + rate + capability crowd, aka the "what can this radio even do" squad ✨:

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 little helpers that poke at that sband/iftype data 👇

_ieee80211_set_sband_iftype_data(9), ieee80211_set_sband_iftype_data(9), for_each_sband_iftype_data(9), ieee80211_get_sband_iftype_data(9), ieee80211_get_he_iftype_cap(9), ieee80211_get_he_6ghz_capa(9), ieee80211_get_eht_iftype_cap(9), ieee80211_get_uhr_iftype_cap(9), wiphy_read_of_freq_limits(9)

🎀 Actions and configuration 🎀

this is the main character chunk of the list, no cap — everything you'd actually touch when you're setting things up 💅

Actions and configuration(9), 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)

the chandef besties — literally the whole "what width is this channel tho" department 🌈

survey + crypto + the AP-side beaconing 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 whole "who's connected and how fast" saga ⭐

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 / power stuff, plus getting station info out 🔥

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)

mesh, OCB, mpath and bss parameters, oh my 💀

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 🌸

the "who's out there and what are they broadcasting" section, literally my favorite genre of chaos 🦋

Scanning and BSS list handling(9), 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)

auth / assoc / deauth / disassoc — the whole situationship pipeline 😭

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)

wowlan / coalesce / wakeup — the "your phone was asleep and still did stuff" files 🙈

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) 💜

yes it's its own whole moment, and honestly? iconic 👑

Neighbor Awareness Networking (NAN)(9), 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 pmk / external auth / FTM / PMSR / OWE — ranging, measurements, and the fancier handshakes 🎀

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 files 🦋

struct cfg80211_ops(9) is the big one, and here's everyone hanging out with it 💖

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)

the wiphy itself and every accessor / lifecycle / locking helper around it ✨

struct wiphy(9), wiphy_priv(9), priv_to_wiphy(9), set_wiphy_dev(9), wiphy_dev(9), wiphy_name(9), wiphy_new_nm(9), wiphy_new(9), wiphy_register(9), rcu_dereference_wiphy(9), wiphy_dereference(9), get_wiphy_regdom(9), wiphy_unregister(9), wiphy_free(9), wiphy_lock(9), wiphy_unlock(9)

work queue besties — queue it, cancel it, flush it, check if it's still pending, repeat 🔁

wiphy_work_queue(9), wiphy_work_cancel(9), wiphy_work_flush(9), wiphy_delayed_work_queue(9), wiphy_delayed_work_cancel(9), wiphy_delayed_work_flush(9), wiphy_delayed_work_pending(9), wiphy_hrtimer_work_queue(9), wiphy_hrtimer_work_cancel(9), wiphy_hrtimer_work_flush(9), wiphy_hrtimer_work_pending(9)

and the wireless_dev crew, plus the AP reg power enum 👑

enum ieee80211_ap_reg_power(9), struct wireless_dev(9), wdev_priv(9), wdev_chandef(9)

🌈 Utility functions 🌈

the little guys who do one job and do it well, i love them 🍓

Utility functions(9), ieee80211_channel_equal(9), ieee80211_channel_to_khz(9), ieee80211_channel_to_freq_khz(9), ieee80211_channel_to_frequency(9), ieee80211_frequency_to_channel(9), ieee80211_get_channel_khz(9), ieee80211_get_channel(9), cfg80211_channel_is_psc(9), ieee80211_radio_freq_range_valid(9), cfg80211_radio_chandef_valid(9), cfg80211_wdev_channel_allowed(9), ieee80211_get_response_rate(9), ieee80211_mandatory_rates(9), struct ieee80211_radiotap_iterator(9), ieee80211_get_hdrlen_from_skb(9), ieee80211_hdrlen(9), ieee80211_get_mesh_hdrlen(9)

💅 Data path helpers 💅

802.11 → 802.3 conversions, A-MSDU stuff, and the element/IE hunting tools, fr fr useful 🎀

Data path helpers(9), ieee80211_data_to_8023_exthdr(9), ieee80211_data_to_8023(9), ieee80211_is_valid_amsdu(9), ieee80211_amsdu_to_8023s(9), ieee80211_get_8023_tunnel_proto(9), ieee80211_strip_8023_mesh_hdr(9), cfg80211_classify8021d(9)

find that IE, bestie 🔍

cfg80211_find_elem_match(9), cfg80211_find_ie_match(9), cfg80211_find_elem(9), cfg80211_find_ie(9), cfg80211_find_ext_elem(9), cfg80211_find_ext_ie(9), cfg80211_find_vendor_elem(9), cfg80211_find_vendor_ie(9), enum cfg80211_rnr_iter_ret(9), cfg80211_iter_rnr(9), cfg80211_defragment_element(9), cfg80211_send_layer2_update(9)

🌸 Regulatory enforcement infrastructure 🌸

the rules department, and they are not joking around 😤

Regulatory enforcement infrastructure(9), regulatory_hint(9), regulatory_set_wiphy_regd(9), regulatory_set_wiphy_regd_sync(9), wiphy_apply_custom_regulatory(9), freq_reg_info(9), reg_initiator_name(9), regulatory_pre_cac_allowed(9)

internal regulatory db functions — yes, "internal", you didn't hear it from me 🤫

Internal regulatory db functions(9), reg_query_regdb_wmm(9)

🧚 Scan / BSS notification & reporting 🧚

cfg80211_scan_done(9), cfg80211_sched_scan_results(9), cfg80211_sched_scan_stopped(9), cfg80211_sched_scan_stopped_locked(9), cfg80211_inform_bss_frame_data(9), cfg80211_gen_new_bssid(9), cfg80211_is_element_inherited(9), cfg80211_merge_profile(9), enum cfg80211_bss_frame_type(9), cfg80211_get_ies_channel_number(9), cfg80211_ssid_eq(9), cfg80211_inform_bss_data(9)

BSS get / ref / put / unlink / iterate — the whole ownership dance 💃

__cfg80211_get_bss(9), cfg80211_get_bss(9), cfg80211_ref_bss(9), cfg80211_put_bss(9), cfg80211_unlink_bss(9), cfg80211_bss_iter(9)

mlme mgmt + assoc failure + mic failure + ibss + peer candidates 🦋

cfg80211_rx_mlme_mgmt(9), cfg80211_auth_timeout(9), struct cfg80211_rx_assoc_resp_data(9), cfg80211_rx_assoc_resp(9), struct cfg80211_assoc_failure(9), cfg80211_assoc_failure(9), cfg80211_tx_mlme_mgmt(9), cfg80211_rx_unprot_mlme_mgmt(9), cfg80211_michael_mic_failure(9), cfg80211_ibss_joined(9), cfg80211_notify_new_peer_candidate(9)

remain-on-channel + mgmt tx expiry, aka "the timer ran out, sorry babe" 😭

cfg80211_ready_on_channel(9), cfg80211_remain_on_channel_expired(9), cfg80211_tx_mgmt_expired(9)

station info / tid stats helpers and the new-sta & del-sta notifications 🫶

cfg80211_sinfo_alloc_tid_stats(9), cfg80211_link_sinfo_alloc_tid_stats(9), cfg80211_sinfo_release_content(9), cfg80211_new_sta(9), cfg80211_del_sta_sinfo(9), cfg80211_del_sta(9), cfg80211_conn_failed(9)

rx mgmt + tx status + control port, the whole plumbing situation 🔥

struct cfg80211_rx_info(9), cfg80211_rx_mgmt_ext(9), cfg80211_rx_mgmt_khz(9), cfg80211_rx_mgmt(9), struct cfg80211_tx_status(9), cfg80211_mgmt_tx_status_ext(9), cfg80211_mgmt_tx_status(9), cfg80211_control_port_tx_status(9), cfg80211_rx_control_port(9)

🌈 CQM, radar, CAC & friends 🌈

cfg80211_cqm_rssi_notify(9), cfg80211_cqm_pktloss_notify(9), cfg80211_cqm_txe_notify(9), cfg80211_cqm_beacon_loss_notify(9), __cfg80211_radar_event(9), cfg80211_sta_opmode_change_notify(9), cfg80211_cac_event(9), cfg80211_background_cac_abort(9), cfg80211_gtk_rekey_notify(9), cfg80211_pmksa_candidate_notify(9), cfg80211_rx_spurious_frame(9), cfg80211_rx_unexpected_4addr_frame(9), cfg80211_probe_status(9), cfg80211_report_obss_beacon_khz(9), cfg80211_report_obss_beacon(9), struct cfg80211_beaconing_check_config(9)

and that's genuinely the entire list — every single name, exactly as printed, not one of them dropped 💖 main character energy all the way down.

okay so the SEE ALSO list keeps going, and honestly bestie it's giving phonebook energy — but every single one is here, no skips, no cap:

cfg80211_reg_check_beaconing(9), cfg80211_reg_can_beacon(9), cfg80211_reg_can_beacon_relax(9) — the whole "can I beacon or nah" committee 🚦
cfg80211_ch_switch_notify(9), cfg80211_ch_switch_started_notify(9) — channel-switch announcements, the group chat updates of the radio world 📢
ieee80211_operating_class_to_band(9), ieee80211_operating_class_to_chandef(9), ieee80211_chandef_to_operating_class(9), ieee80211_chandef_to_khz(9) — the conversion girlies, translating between all the channel dialects 🔄
cfg80211_tdls_oper_request(9), cfg80211_calculate_bitrate(9) — TDLS stuff and the bitrate math ✨
cfg80211_unregister_wdev(9), cfg80211_register_netdevice(9), cfg80211_unregister_netdevice(9) — the registration/inregistration trio, it's giving commitment issues 💀
struct cfg80211_ft_event_params(9), cfg80211_ft_event(9) — fast-transition event things 🦋
cfg80211_get_p2p_attr(9) — P2P attribute fetching, iykyk
ieee80211_ie_split_ric(9), ieee80211_ie_split(9), ieee80211_fragment_element(9) — splitting and fragmenting IEs, the unhinged little detail gremlins 🙈
cfg80211_report_wowlan_wakeup(9) — wakeup reporting, main character energy 🔥
cfg80211_crit_proto_stopped(9) — critical protocol stopped, rip
ieee80211_get_num_supported_channels(9) — counting channels, lowkey satisfying 🍓
cfg80211_check_combinations(9), cfg80211_iter_combinations(9) — combination checking and iterating, the combinatorics besties 🎀
cfg80211_get_radio_idx_by_chan(9) — find the radio by channel, iconic 🔍
cfg80211_stop_link(9), cfg80211_stop_iface(9), cfg80211_shutdown_all_interfaces(9) — the shut-it-down squad, and yes the last one is all of them 💅
wiphy_ext_feature_set(9), wiphy_ext_feature_isset(9) — extended feature flags: set it, check it ✨
cfg80211_free_nan_func(9), struct cfg80211_nan_match_params(9), cfg80211_nan_match(9), cfg80211_nan_func_terminated(9), cfg80211_nan_sched_update_done(9) — the NAN crew, NAN gang rise 🌸
cfg80211_external_auth_request(9), cfg80211_pmsr_report(9), cfg80211_pmsr_complete(9) — auth requests and PMSR reporting/completion, periodt 🫶
cfg80211_iftype_allowed(9), cfg80211_assoc_comeback(9), cfg80211_update_owe_info_event(9) — iftype permissions, assoc comeback, OWE info events ⭐
cfg80211_bss_flush(9) — flush the BSS list, spring cleaning vibes 🧹
cfg80211_bss_color_notify(9), cfg80211_obss_color_collision_notify(9), cfg80211_color_change_started_notify(9), cfg80211_color_change_aborted_notify(9), cfg80211_color_change_notify(9) — the entire color change notification family, no notes 🌈
cfg80211_6ghz_power_type(9) — 6GHz power types, the new-gen era 👑
cfg80211_links_removed(9), struct cfg80211_mlo_reconf_done_data(9), cfg80211_mlo_reconf_add_done(9) — link removal + MLO reconfig done data and add-done, MLO besties stay winning 💜
cfg80211_schedule_channels_check(9), cfg80211_epcs_changed(9) — scheduling channel checks, EPCS changes 📅
cfg80211_next_nan_dw_notif(9), cfg80211_nan_cluster_joined(9), cfg80211_nan_ulw_update(9), cfg80211_nan_channel_evac(9) — more NAN: DW notifs, cluster joins, ULW updates, channel evac 🐝
wiphy_locked_debugfs_read(9), wiphy_locked_debugfs_write(9) — locked debugfs read and write, the responsible icons 🔒
cfg80211_s1g_get_start_freq_khz(9), cfg80211_s1g_get_end_freq_khz(9), cfg80211_s1g_get_primary_sibling(9) — S1G start freq, end freq, and primary sibling, all in kHz, all slay ✨
cfg80211_incumbent_signal_notify(9) — and finally incumbent signal notify, closing out the list with a little bow 🎀

and that's the whole thing bestie, page complete, you ate 💅 the source lives at ./include/net, dated October 2026, and this is ieee80211_f...z_to_channel(9) signing off — go forth and channel-convert responsibly 😭🫶

📦 where this page comes from

nixpkgs unstable: linux-manual 7.3.1
💖 girlified by deepseek-ai/DeepSeek-V4.1-Flash-1017 on 2026-11-04: a language model's rewrite of the original, under its terms