cipso_v4_map_cache_hash(9)

📦 version 7.3.1, in nixpkgs unstable

💅 cipso_v4_map_cache_hash(9)

okay so bestie, welcome to the cipso_v4_map_cache_hash club — this is a page straight out of the Kernel API Manual, and honestly? it's a little one. a tiny icon. a single-purpose queen. let's get into it ✨

🌸 NAME 🌸

cipso_v4_map_cache_hash — literally just the hashing function for the CIPSO cache. that's the whole job. that's her whole personality 🎀

🦋 SYNOPSIS 🦋

u32 cipso_v4_map_cache_hash (const unsigned char *key , u32 key_len );

yeah. two arguments, one u32 coming back at you. clean, minimal, no drama 💜

✨ ARGUMENTS ✨

  • key — the hash key. the actual bytes going into the blender 🍓
  • key_len — the length of the key, and yes it's measured in bytes. count 'em correctly, bestie, no cap 😭

🔥 DESCRIPTION 🔥

okay so here's the tea: this is the CIPSO tag hashing function. you hand it a key, it does its little hash dance, and it returns a 32-bit hash value. that's it. that's the whole vibe check. slay 💅

no hidden behaviour, no surprise side quests — the manual says exactly this and nothing more, and I'm not about to invent lore for you 🫶

🌈 SEE ALSO 🌈

the friend group is huge, so buckle up. this whole crew lives in the kernel file ./net/ipv4/cipso_ipv4.c:

like I said. big friend group. main character energy all around 👑

and that's the page!! mwah 💖 this lil doc came from ./net/ipv4, dated October 2026 — so go forth, hash responsibly, and remember: 32 bits, no more, no less. periodt 🧚‍♀️✨

📦 where this page comes from