STRUCT NFT_SET_EXT_TMPL(9)

💅 struct nft_set_ext_tmpl — set extension template 💅

okay bestie, welcome to the Kernel API Manual ✨ this one's a struct page and it's honestly kind of a vibe — it's all about the set extension template, which is the little blueprint that says "here's where each extension lives and how big it is." lowkey the backstage crew of nf_tables 🎀

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🌸 NAME 🌸

struct nft_set_ext_tmpl — set extension template 💖

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✨ SYNOPSIS ✨

here's the whole glow-up, copy it exactly pls:

struct nft_set_ext_tmpl {
    u16 len;
    u8 offset[NFT_SET_EXT_NUM];
    u8 ext_len[NFT_SET_EXT_NUM];
 };

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🦋 Members 🦋

okay so let's meet the cast 👑

• len — the length of the extension area. that's the whole chunk's size, periodt 💅
• offset — the offsets of the individual extension types. like a little map of where each one starts 📍
• ext_len — the length of the expected extension (this one's used to sanity check, so it's giving hall monitor energy 🧚)

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🌈 SEE ALSO 🌈

in the kernel file ./include/net/netfilter/nf_tables.h, and these iconic neighbours:

• struct nft_verdict(9)
• struct nft_regs(9)
• struct nft_ctx(9)
• struct nft_userdata(9)
• struct nft_set_elem(9)
• enum nft_iter_type(9)
• struct nft_set_desc(9)
• enum nft_set_class(9)
• struct nft_set_estimate(9)
• struct nft_expr(9)
• struct nft_set_ops(9)
• struct nft_set_type(9)
• struct nft_set(9)
• struct nft_set_binding(9)
• enum nft_set_extensions(9)
• struct nft_set_ext_type(9)
• struct nft_set_ext(9)
• struct nft_expr_type(9)
• struct nft_expr_ops(9)
• struct nft_rule(9)
• struct nft_chain_validate_state(9)
• struct nft_chain(9)
• struct nft_chain_type(9)
• struct nft_base_chain(9)
• struct nft_table(9)
• struct nft_object_hash_key(9)
• struct nft_object(9)
• struct nft_object_type(9)
• struct nft_object_ops(9)
• struct nft_flowtable(9)
• struct nft_traceinfo(9)
• struct nft_trans(9)
• struct nft_trans_hook(9)
• struct nft_trans_binding(9)

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💀 reminder bestie: ext_len isn't decorative, it's the sanity check. don't skip it, fr fr.

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and that's the whole page!! sourced from ./include/net/netfilter, dated October 2026, and it's struct nft_set_ext_tmpl(9) — go be iconic with your extensions 🫶💜🌸