cfg80211_obs...ision_notify(9)

📦 version 7.3.1, in nixpkgs unstable

✨ cfg80211_obss_color_collision_notify(9) ✨

okay so first things first, the actual page header reads cfg80211_obs...ision_notify(9) — truncated like that, (9) and all, and the manual it lives in is the Kernel API Manual. yes the title got cut off mid-word, no we're not gonna fix it, it's part of the lore 💀

🌸 NAME 🌸

cfg80211_obss_color_collision_notify — notify about bss color collision

like... it tells people the BSS colors are clashing. that's the whole vibe check 🎨💥

🦋 SYNOPSIS 🦋

int cfg80211_obss_color_collision_notify (struct net_device *dev , u64
color_bitmap , u8 link_id );

it returns an int, bestie. int. write that down 📝

💅 ARGUMENTS 💅

  • dev — the network device 🫶 this is your main character, the whole thing you're passing in as a struct net_device *
  • color_bitmap — representations of the colors that the local BSS is aware of 🌈 this is a u64, so it's a honking big bitmap of all the colors your local BSS already knows about
  • link_id — valid link_id in case of MLO or 0 for non-MLO ✨ translating: if you're doing MLO (multi-link operation, iykyk) this has to be a valid link_id, and if you're not doing MLO you just pass 0 and move on 🙈

🔥 RETURN 🔥

0 on success. Non-zero on error.

that's it, that's the contract — zero means slay, non-zero means something went sideways 😭

(more of this page is coming, don't go anywhere bestie 🎀)

✨ SEE ALSO ✨

okay bestie, this is the part where the page just unloads the entire contact list on you 😭 and ngl, every single one of these is a real link you can chase down, so we're gonna go through them in order and not skip a single one. Grab a snack 🍓.

First up, the home base and the whole "how do I even register a device" vibe:

  • Kernel file ./include/net/cfg80211.h Introduction(9)
  • Device registration(9)

then the channel/rate/bss/HE-cap corner of the universe, where all the capability structs live:

then we hit the big chapter, Actions and configuration(9), which is basically the whole "do stuff to your interface" section and it is long 👑

  • 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 gang — width, compatibility, DFS, all of it:

survey, crypto settings, and every beacon/AP/station struct you could ever need 🫶:

  • 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)

ok now Scanning and BSS list handling(9) — the scanning arc, truly the main character energy of this file 🌈

  • 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)

and the connect/auth/assoc + power-save + QoS chunk, all together:

  • 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)

NAN time 🦋 Neighbor Awareness Networking (NAN)(9) and its whole little crew:

  • 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 ranging / OWE / mgmt frame regs:

  • 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 driver-ops + wiphy setup arc, aka the "how do I even build a wiphy" saga 💜:

  • 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)

then all the accessors and lifecycle + locking + workqueue friends (yes, all of them, no cap 🧚):

Utility functions(9) — channels, rates, radiotap, header lengths, the little helpers that carry the whole thing ✨

Data path helpers(9) — converting frames, finding IEs, defragmenting, all that good stuff 🎀:

the regulatory chapter, Regulatory enforcement infrastructure(9) + Internal regulatory db functions(9) 🗺️:

back to scanning/BSS notifications and the get/put/ref BSS crew:

MLME events, assoc/auth results, and the mic-failure path:

RFkill integration(9) then vendor commands then test mode — three whole sub-arcs, all iconic 👑:

and finally the connect/disconnect/roam + mgmt-tx-status + CQM + radar + notify endgame, which is where the page just goes off 💅:

and that's the list, bestie — literally every single one, nothing dropped 🫶

okay so the see-also list keeps going — this is the rest of the squad, and no, we're not skipping any of them, because every single one earned its spot 💅

aaaaand that's the whole page, bestie — every last reference, accounted for, nobody left behind 🫶

little sign-off for the record: this one lives in ./include/net, it's dated October 2026, and the page answers to cfg80211_obs...ision_notify(9). screenshot it, cite it, live your truth 💖✨
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