ENUM NFNL_HOOK_CHAINTYPE(9)

💅 enum nfnl_hook_chaintype(9) — the Kernel API Manual, bestie edition

Okay so picture this: you're deep in the kernel, you're poking at netfilter hooks, and you hit this little enum. It's literally just "chain type" — that's the whole NAME, no notes. chain type. Short, sweet, iconic. 🎀

This page lives in section 9 of the Kernel API Manual, so yeah, it's kernel-internals territory — bring snacks. 🍓

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✨ SYNOPSIS ✨

Here's the whole shape of it, exactly as it's declared:

enum nfnl_hook_chaintype {
    NFNL_HOOK_TYPE_NFTABLES ,
    NFNL_HOOK_TYPE_BPF ,
    NFNL_HOOK_TYPE_NFT_FLOWTABLE

};

Three constants, all up in there, and the vibes are immaculate. Let's meet them 💖

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🌸 Constants 🌸

• NFNL_HOOK_TYPE_NFTABLES — this one's the nf_tables base chain, the main character of the chain world 👑
• NFNL_HOOK_TYPE_BPF — and this one's a bpf program, doing its own little eBPF thing 🦋
• NFNL_HOOK_TYPE_NFT_FLOWTABLE — last but not least, an nf_tables flowtable, the flow-y one 🌈

That's the roster. Three. No cap, no extra members hiding in the back. 💀

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👀 SEE ALSO 👀

Go touch some related grass, iykyk:

• The kernel file ./include/uapi/linux/netfilter/nfnetlink_hook.h — that's where the enum actually lives, so go say hi 🫶
• enum nfnl_hook_attributes(9)
• enum nfnl_hook_chain_info_attributes(9)
• enum nfnl_hook_bpf_attributes(9)

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Fr fr, this page doesn't give you any extra behaviour notes or danger warnings — it's just the constants and where to find them. Don't go inventing semantics that aren't printed here, bestie. 💅

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And that's a wrap! 🧚 This little gem comes to you from ./include/uapi/linux/netfilter, dated October 2026, and it's the enum nfnl_hook_chaintype(9) page absolutely serving. Obsessed. Slay. Periodt. ⭐💜