cipso_v4_map_lvl_ntoh(9)

📦 version 7.3.1, in nixpkgs unstable

💅 cipso_v4_map_lvl_ntoh — a kernel API manual moment (section 9, bestie)

okay so this is a page straight out of the Kernel API Manual, and it's lowkey one of those tiny functions that does one job and does it slayfully. no cap, it's giving "quiet luxury" — small, specific, absolutely essential if you're doing CIPSO MLS label stuff.

✨ NAME ✨

cipso_v4_map_lvl_ntoh — literally just "Perform a level mapping from the network to the host". that's it, that's the whole vibe 🦋

🎀 SYNOPSIS 🎀

int cipso_v4_map_lvl_ntoh (const struct cipso_v4_doi *doi_def , u32
net_lvl , u32 *host_lvl );

like… look at her. three params, returns an int, no drama. main character energy honestly 💅

🌸 ARGUMENTS 🌸

  • doi_def — the DOI definition. yes, that DOI definition. she's the one who knows all the mapping rules, you're just borrowing her notes 📓
  • net_lvl — the network/CIPSO MLS level. this is the level as it arrives over the wire, in network/foreign-label form 🛰️
  • host_lvl — the host MLS level. this is where the translated, local-flavored level gets written ✍️

🔥 DESCRIPTION 🔥

so what's actually happening here? this function performs a label mapping to translate a CIPSO level into the correct local MLS level, using the DOI definition you handed it. that's the whole task. it's a translator, but make it security labels 🧚

returns zero on success, negative values otherwise. that's the whole contract — non-zero and negative means something went sideways, and you should go check your inputs, bestie 😭

ngl, this is a "trust the return value" situation. zero = we ate. negative = we did not eat. check it. always check it. 🙈

👑 SEE ALSO 👑

the whole friend group, fr fr — and also where the source lives:

like, that's the entire crew and they're all icons, no skips 💜

and that's the page!! mwah 🫶

this one ships from source ./net/ipv4, dated October 2026, in the Kernel API Manual — and honestly? iconic of her. go read the neighbors, they're all linked above. bye bestie 🌈✨

📦 where this page comes from