STRUCT NFT_USERDATA(9)

✨ NAME ✨

okay so bestie, this is the Kernel API Manual page for struct nft_userdata(9) 💖 — user defined data associated with an object. that's the whole cute little job: it's the user defined data that gets associated with an object. 🎀

🦋 SYNOPSIS 🦋

       struct nft_userdata {
           u8 len;
           unsigned char           data[];
        };

🧩 Members 🧩

• len — length of the data.
• data — content.

🌸 Description 🌸

okay so the presence of user data is indicated in an object specific fashion, which means a length of zero can't occur — no, literally, it's not a vibe that exists here. and the value len indicates data of length len + 1 (plus one, bestie, don't forget the plus one 🫶).

👑 SEE ALSO 👑

the kernel file is ./include/net/netfilter/nf_tables.h, and these are the related manual pages — collect them all, iykyk:

• struct nft_verdict(9)
• struct nft_regs(9)
• struct nft_ctx(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_tmpl(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)

later bestie 💜 — this page is from ./include/net/netfilter, dated October 2026, and it's the struct nft_userdata(9) manual entry. slay and stay hydrated. ✨