ENUM NFNL_HOOK_CHAIN_INFO_ATTRIBUTES(9)

💜 enum nfnl_hook_chain_info_attributes — chain description (Kernel API Manual, bestie edition)

okay so this is a page straight out of the Kernel API Manual, and it's literally just one lil enum called nfnl_hook_chain_info_attributes that holds the chain description info. tiny enum, big main character energy ✨

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✨ SYNOPSIS ✨

enum nfnl_hook_chain_info_attributes {
    NFNLA_HOOK_INFO_UNSPEC ,
    NFNLA_HOOK_INFO_DESC ,
    NFNLA_HOOK_INFO_TYPE ,
    __NFNLA_HOOK_INFO_MAX

};

no cap, that's the whole vibe 🫶

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🌸 Constants 🌸

• NFNLA_HOOK_INFO_UNSPEC — -- undescribed -- 🙈 the manpage literally says nothing about it, so i'm not gonna make stuff up, that's the whole rule
• NFNLA_HOOK_INFO_DESC — it's the nft chain and table name, and it's a NLA_NESTED attribute 🎀
• NFNLA_HOOK_INFO_TYPE — this one's the chain type, typed as enum nfnl_hook_chaintype, and it rides in as a NLA_U32 🔥
• __NFNLA_HOOK_INFO_MAX — also -- undescribed -- 💀 it's just sitting there being mysterious

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🦋 Description 🦋

bestie listen, this is the important bit 👑 NFNLA_HOOK_INFO_DESC is a shape-shifter — what it actually contains depends on the value of NFNLA_HOOK_INFO_TYPE:

• NFNL_HOOK_TYPE_NFTABLES → it's an enum nft_table_attributes
• NFNL_HOOK_TYPE_BPF → it's an enum nfnl_hook_bpf_attributes

so like, same label, different payload depending on the type. iykyk 💅

not me emphasizing this but fr fr: the DESC attribute's meaning is not fixed — always go check the TYPE first before you assume anything 😭

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🎀 SEE ALSO 🎀

• Kernel file ./include/uapi/linux/netfilter/nfnetlink_hook.h — the source of truth, go read it 🌈
• enum nfnl_hook_attributes(9)
• enum nfnl_hook_chaintype(9)
• enum nfnl_hook_bpf_attributes(9)

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okay that's the whole page, slay ✨💖 this lil enum lives its best life in ./include/uapi/linux/netfilter, and this edition is dated October 2026 🗓️⭐ go forth and nest your attributes correctly, icon 🧚‍♀️💜