pipapo_expand(9)

💅 pipapo_expand(9) — like, the Kernel API Manual one, bestie ✨

okay so first thing: this is a section 9 page (kernel API manual, iykyk), and it's about pipapo_expand. she's a lil function with a big job and honestly? main character energy. let's get into it 🫶

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🌸 NAME 🌸

pipapo_expand — expand to composing netmasks, insert into lookup table

like yes, that's the whole vibe. she expands a range into composing netmasks and then inserts the corresponding stuff into the lookup table. slay 💅

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✨ SYNOPSIS ✨

int pipapo_expand (struct nft_pipapo_field *f , const u8 *start , const
u8 *end , int len );

that's the signature, exactly as written, no notes 🔥

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🎀 ARGUMENTS 🎀

• f — the field containing the lookup table 💖 like this is the container she's working in, bestie.
• start — start of range. literally the beginning, no cap.
• end — end of range. where the whole thing stops 🌈
• len — length of value in bits. so like, measured in bits, not bytes, don't get it twisted ✨

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🦋 DESCRIPTION 🦋

so what she actually does: expand the range to composing netmasks, and insert the corresponding rule references in lookup buckets 🎀

that's it. that's the job. she takes your range, breaks it down into composing netmasks, and drops the matching rule references into the lookup buckets. iconic behaviour, no notes 💜

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⭐ RETURN ⭐

• number of inserted rules on success 💖
• a negative error code on failure 😭 (the sad path, we don't love her but we respect her)

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🧚 SEE ALSO 🧚

so there are, like, a lot of friends in this orbit. family reunion energy fr fr 🍓

• ./net/netfilter/nft_set_pipapo.c Theory of Operation(9) — the lore. read this one if you want the whole backstory 👑
• pipapo_refill(9)
• pipapo_get_slow(9)
• pipapo_get(9)
• nft_pipapo_lookup(9)
• nft_pipapo_get(9)
• pipapo_realloc_mt(9)
• lt_calculate_size(9)
• pipapo_resize(9)
• pipapo_bucket_set(9)
• pipapo_lt_4b_to_8b(9)
• pipapo_lt_8b_to_4b(9)
• pipapo_lt_bits_adjust(9)
• pipapo_insert(9)
• pipapo_step_diff(9)
• pipapo_step_after_end(9)
• pipapo_base_sum(9)
• pipapo_map(9)
• pipapo_free_scratch(9)
• pipapo_realloc_scratch(9)
• pipapo_maybe_clone(9)
• nft_pipapo_insert(9)
• pipapo_clone(9)
• pipapo_rules_same_key(9)
• pipapo_unmap(9)
• pipapo_drop(9)
• pipapo_gc_scan(9)
• pipapo_gc_queue(9)
• pipapo_free_fields(9)
• pipapo_reclaim_match(9)
• nft_pipapo_commit(9)
• nft_pipapo_activate(9)
• nft_pipapo_deactivate(9)
• nft_pipapo_flush(9)
• pipapo_get_boundaries(9)
• pipapo_match_field(9)
• nft_pipapo_remove(9)
• nft_pipapo_do_walk(9)
• nft_pipapo_walk(9)
• nft_pipapo_privsize(9)
• nft_pipapo_estimate(9)
• nft_pipapo_init(9)
• nft_set_pipapo_match_destroy(9)
• nft_pipapo_destroy(9)
• nft_pipapo_gc_init(9)

that's the whole group chat, everyone accounted for 💀✨

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okay bye bestie, go read your netfilter source 🎀 this page lives in ./net/netfilter, dated October 2026, and honestly? she ate. periodt 💅🔥👑