STRUCT CFG80211_COLOCATED_AP(9)

💅 struct cfg80211_colocated_ap(9) — the kernel API manual, bestie edition 🎀

okay so this is a page from the Kernel API Manual, section 9, and it's all about struct cfg80211_colocated_ap — literally just the container that holds "colocated AP information" ✨. if you've ever been like "wait, which APs are hanging out together in the same spot", this struct is the one holding the receipts. 🫶

✨ SYNOPSIS ✨

struct cfg80211_colocated_ap {
    struct list_head list;
    u8 bssid[ETH_ALEN];
    u8 ssid[IEEE80211_MAX_SSID_LEN];
    size_t ssid_len;
    u32 short_ssid;
    u32 center_freq;
    u8 unsolicited_probe:1, oct_recommended:1, same_ssid:1, multi_bss:1,
transmitted_bssid:1, colocated_ess:1, short_ssid_valid:1;
    s8 psd_20;
 };

look at her. six whole u8 bitfields crammed onto one line, no cap, that's the main character energy right there 👑 (and yes, the continuation line really does start at column zero — that's how it is, we don't fix what isn't broken 💅).

🌸 MEMBERS 🌸

• list — the linked list that ties together all the colocated APs. it's giving "everyone's invited to the group chat" 🫶
• bssid — the BSSID of the reported AP. its little name tag 💖
• ssid — the SSID of the reported AP.
• ssid_len — length of the ssid. gotta know how much of it is real ✨
• short_ssid — the short SSID for this SSID. the lowkey abbreviated version, iykyk.
• center_freq — the frequency the reported AP is on. where it's vibing on the dial 📻
• unsolicited_probe — the reported AP is part of an ESS where all the APs operating in the same channel as the reported AP (and that might be detected by a STA receiving this frame) are transmitting unsolicited Probe Response frames every 20 TUs. so basically everybody in that ESS is out here yelling unprompted every 20 TUs 😭 loud and proud fr fr.
• oct_recommended — OCT is recommended to exchange MMPDUs with the reported AP. a recommendation, not a demand 🌈
• same_ssid — the reported AP has the same SSID as the reporting AP. twins!! 👯
• multi_bss — the reported AP is part of a multiple BSSID set. it's a whole squad, not a solo act 💜
• transmitted_bssid — the reported AP is the transmitting BSSID. main character of that frame, periodt ⭐
• colocated_ess — all the APs that share the same ESS as the reported AP are colocated and can be discovered via legacy bands. found via the old-school route, iconic 🎀
• short_ssid_valid — short_ssid is valid and can be used. green flag, go ahead 🟢
• psd_20 — the 20MHz PSD EIRP of the primary 20MHz channel for the reported AP. yes that is a mouthful, yes it's s8, we love a tiny signed type ✨

🦋 SEE ALSO 🦋

• Kernel file ./net/wireless/core.h — go read it, it's the source of truth bestie 📚

heads up: everything here is straight from the kernel API manual, so treat the field semantics as gospel — don't go inventing behaviour, the kernel will not be nice about it 💀

and that's the whole page!! brought to you by <./net/wireless>, October 2026 — mwah, go touch some core.h 🧚💜 🎀