cfg80211_find_elem_match(9)

💖 NAME 💖

okay so this is cfg80211_find_elem_match(9) from the Kernel API Manual — part 1 of 3, bestie, and yes more parts are coming, so don't go anywhere 💅

cfg80211_find_elem_match — match an information element and a byte array in data. It's giving "find the IE, match the bytes" energy, and honestly? iconic. ✨

✨ SYNOPSIS ✨

const struct element * cfg80211_find_elem_match (u8 eid , const u8 *ies , unsigned int len , const u8 *match , unsigned int match_len , unsigned int match_offset );

🎀 ARGUMENTS 🎀

• eid — the element ID, aka which element we're looking for 👀
• ies — the data consisting of IEs
• len — length of the data
• match — the byte array to match
• match_len — number of bytes in the match array
• match_offset — offset in the IE data where the byte array should match. ⚠️ note the difference to cfg80211_find_ie_match: that one considers the offset to start from the element ID byte, but here we take the data portion instead. iykyk, bestie — this offset is not the same thing.

🔥 RETURN 🔥

It returns NULL if the element ID could not be found, or if the element is invalid (it claims to be longer than the given data), or if the byte array doesn't match. Otherwise, it returns the requested element struct. Slay. 💅

💅 NOTE 💅

⚠️ no cap: there are no checks on the element length other than having to fit into the given data and being large enough for the byte array to match. That's the only length vibe check happening here, fr fr.

💫 SEE ALSO 💫

okay bestie, buckle up, because this is the part where the page just. keeps. going. 💀

First up, the actual kernel file all this lives in: ./include/net/cfg80211.h.

And then the whole extended friend group — every single one of these is a (9) page, fr fr. No skipping, no "you get the idea" — I said what I said:

• Introduction(9)
• Device registration(9)
• 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)
• _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(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)
• cfg80211_get_chandef_type(9)
• cfg80211_chandef_create(9)
• cfg80211_chandef_identical(9)
• cfg80211_chandef_is_edmg(9)
• cfg80211_chandef_is_s1g(9)
• cfg80211_chandef_compatible(9)
• nl80211_chan_width_to_mhz(9)
• cfg80211_chandef_get_width(9)
• cfg80211_chandef_valid(9)
• cfg80211_chandef_usable(9)
• cfg80211_chandef_dfs_required(9)
• cfg80211_chandef_dfs_usable(9)
• cfg80211_chandef_dfs_cac_time(9)
• cfg80211_chandef_primary(9)
• cfg80211_chandef_npca_valid(9)
• cfg80211_chandef_add_npca(9)
• cfg80211_chandef_add_dbe(9)
• nl80211_send_chandef(9)
• ieee80211_chandef_max_power(9)
• cfg80211_chandef_s1g_pri_width(9)
• cfg80211_any_usable_channels(9)
• 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)
• 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)
• 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)
• 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(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)
• 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)
• 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)(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)
• 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)
• 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)
• 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)
• 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)
• enum ieee80211_ap_reg_power(9)
• struct wireless_dev(9)
• wdev_priv(9)
• wdev_chandef(9)
• Utility functions(9)
• ieee80211_channel_equal(9)
• ieee80211_channel_to_khz(9)
• ieee80211_channel_to_freq_khz(9)
• ieee80211_channel_to_frequency(9)
• ieee80211_freq_khz_to_channel(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(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)
• 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(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(9)
• reg_query_regdb_wmm(9)
• 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)
• __cfg80211_get_bss(9)
• cfg80211_get_bss(9)
• cfg80211_ref_bss(9)
• cfg80211_put_bss(9)
• cfg80211_unlink_bss(9)
• cfg80211_bss_iter(9)
• 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)
• RFkill integration(9)
• wiphy_rfkill_set_hw_state_reason(9)
• wiphy_rfkill_start_polling(9)
• wiphy_rfkill_stop_polling(9)
• Vendor commands(9)
• cfg80211_vendor_cmd_alloc_reply_skb(9)
• cfg80211_vendor_cmd_reply(9)
• cfg80211_vendor_cmd_get_sender(9)
• cfg80211_vendor_event_alloc(9)
• cfg80211_vendor_event_alloc_ucast(9)
• cfg80211_vendor_event(9)
• Test mode(9)
• cfg80211_testmode_alloc_reply_skb(9)
• cfg80211_testmode_reply(9)
• cfg80211_testmode_alloc_event_skb(9)
• cfg80211_testmode_event(9)
• struct cfg80211_fils_resp_params(9)
• struct cfg80211_connect_resp_params(9)
• cfg80211_connect_done(9)
• cfg80211_connect_bss(9)
• cfg80211_connect_result(9)
• cfg80211_connect_timeout(9)
• struct cfg80211_roam_info(9)
• cfg80211_roamed(9)
• cfg80211_port_authorized(9)
• cfg80211_disconnected(9)
• cfg80211_ready_on_channel(9)
• cfg80211_remain_on_channel_expired(9)
• cfg80211_tx_mgmt_expired(9)
• 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)
• 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)
• 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)

---

okay and that's genuinely all of it, no cap 😭 go drink some water, you earned it 🫶 there's still more of this page coming though, so don't wander off 💖

• cfg80211_reg_check_beaconing(9) — yes bestie, the beaconing check 💅
• cfg80211_reg_can_beacon(9) — can we beacon? asking for a friend
• cfg80211_reg_can_beacon_relax(9) — the same question but chill about it
• cfg80211_ch_switch_notify(9) — channel switch announcement, iconic
• cfg80211_ch_switch_started_notify(9) — and the "we're doing it rn" version ✨
• ieee80211_operating_class_to_band(9) — op class in, band out, no cap
• ieee80211_operating_class_to_chandef(9) — same energy but you get a chandef 🎀
• ieee80211_chandef_to_operating_class(9) — the other direction, we love a round trip
• ieee80211_chandef_to_khz(9) — numbers in kHz, slay
• cfg80211_tdls_oper_request(9) — TDLS doing its thing
• cfg80211_calculate_bitrate(9) — math era, honestly kinda obsessed 🧮
• cfg80211_unregister_wdev(9) — bye wireless dev 👋
• cfg80211_register_netdevice(9) — hi netdevice 🫶
• cfg80211_unregister_netdevice(9) — and hi to saying bye
• struct cfg80211_ft_event_params(9) — fast transition event params, struct moment
• cfg80211_ft_event(9) — ft event, periodt
• cfg80211_get_p2p_attr(9) — grab that P2P attribute
• ieee80211_ie_split_ric(9) — splitting IEs, RIC edition
• ieee80211_ie_split(9) — splitting IEs, classic edition
• ieee80211_fragment_element(9) — fragmenting, we been knew 💀
• cfg80211_report_wowlan_wakeup(9) — wakeup report, sleepy era 😴
• cfg80211_crit_proto_stopped(9) — critical protocol stopped, RIP
• ieee80211_get_num_supported_channels(9) — count those channels, literally
• cfg80211_check_combinations(9) — the vibe check for combinations ✨
• cfg80211_iter_combinations(9) — and the iterator version
• cfg80211_get_radio_idx_by_chan(9) — radio index from a channel, iykyk
• cfg80211_stop_link(9) — stopping a link, dramatic but necessary
• cfg80211_stop_iface(9) — stopping an iface 💅
• cfg80211_shutdown_all_interfaces(9) — all of them. every single one. 😭
• wiphy_ext_feature_set(9) — set that extended feature
• wiphy_ext_feature_isset(9) — is it set tho 👀
• cfg80211_free_nan_func(9) — free the NAN function, be responsible bestie
• struct cfg80211_nan_match_params(9) — NAN match params, struct era
• cfg80211_nan_match(9) — it's a match! 🍓
• cfg80211_nan_func_terminated(9) — NAN function said bye
• cfg80211_nan_sched_update_done(9) — schedule update finished ✅
• cfg80211_external_auth_request(9) — external auth request, main character energy
• cfg80211_pmsr_report(9) — PMSR report incoming
• cfg80211_pmsr_complete(9) — PMSR complete, we did it 👑
• cfg80211_iftype_allowed(9) — is this iftype allowed? find out
• cfg80211_assoc_comeback(9) — assoc comeback, the sequel 🌈
• cfg80211_update_owe_info_event(9) — OWE info event update
• cfg80211_bss_flush(9) — flush those BSS entries 🚿
• cfg80211_bss_color_notify(9) — BSS color notification, aesthetic
• cfg80211_obss_color_collision_notify(9) — collision! not the cute kind 💀
• cfg80211_color_change_started_notify(9) — color change started 🎨
• cfg80211_color_change_aborted_notify(9) — color change aborted, nvm
• cfg80211_color_change_notify(9) — color change, the notif itself
• cfg80211_6ghz_power_type(9) — 6 GHz power type, fancy
• cfg80211_links_removed(9) — links removed, gone girl era
• struct cfg80211_mlo_reconf_done_data(9) — MLO reconfig done data, struct slay
• cfg80211_mlo_reconf_add_done(9) — MLO reconfig add done 🫶
• cfg80211_schedule_channels_check(9) — schedule that channel check ⏰
• cfg80211_epcs_changed(9) — EPCS changed, noted
• cfg80211_next_nan_dw_notif(9) — next NAN DW notification
• cfg80211_nan_cluster_joined(9) — joined the NAN cluster, we're in 🎀
• cfg80211_nan_ulw_update(9) — NAN ULW update
• cfg80211_nan_channel_evac(9) — NAN channel evac, evacuate bestie
• wiphy_locked_debugfs_read(9) — debugfs read, locked edition 🔒
• wiphy_locked_debugfs_write(9) — and the write version
• cfg80211_s1g_get_start_freq_khz(9) — S1G start freq in kHz
• cfg80211_s1g_get_end_freq_khz(9) — S1G end freq in kHz
• cfg80211_s1g_get_primary_sibling(9) — primary sibling, family drama 🧚
• cfg80211_incumbent_signal_notify(9) — incumbent signal notification, and that's the list 💖

---

okay that's the whole SEE ALSO situation, bestie — go click through them, they're all right there 💅

and that's a wrap on this one 🎀 this page comes from ./include/net, version-dated October 2026, and it's all about cfg80211_find_elem_match(9). take care of her 🫶✨