nft_register_expr(9)

🌸 nft_register_expr(9) 🌸

okay bestie, welcome to the Kernel API Manual page for nft_register_expr(9) — the little function with main-character energy for registering an nf_tables expr type. It's giving kernel API realness, and we're gonna read it together. 💖

✨ NAME ✨

nft_register_expr — register nf_tables expr type. That's the whole vibe: you're registering an expr type for nf_tables. Slay. 💅

🦋 SYNOPSIS 🦋

int nft_register_expr (struct nft_expr_type *type );

No cap, that's the exact signature. 🫶

🎀 ARGUMENTS 🎀

• type — the expr type. Like, the struct nft_expr_type * you're handing over to get registered. Lowkey the whole point. 🫶

💜 DESCRIPTION 💜

So nft_register_expr registers the expr type for use with nf_tables. That's the tea. ☕

It returns 0 on success, or a negative errno code otherwise. No in-between, bestie — zero means slay, negative errno means something went sideways. 😭

🌈 SEE ALSO 🌈

Kernel file: ./net/netfilter/nf_tables_api.c — that's the source file, iykyk. The squad of related manpages is:

• nft_unregister_expr(9)
• nft_data_hold(9)
• nft_register_obj(9)
• nft_unregister_obj(9)
• nft_parse_u32_check(9)
• nft_dump_register(9)
• nft_data_init(9)
• nft_data_release(9)

p.s. cute sign-off time: this page's source is ./net/netfilter, its date is October 2026, and the manual name is nft_register_expr(9) from the Kernel API Manual. Bye bestie, go register that expr type! 🫶💖✨