cipso_v4_map_cat_rbm_ntoh(9)

📦 version 7.3.1, in nixpkgs unstable

💅 cipso_v4_map_cat_rbm_ntoh — like, the Kernel API Manual page you didn't know you needed

okay bestie, so this whole thing lives under the Kernel API Manual, and today's main character is cipso_v4_map_cat_rbm_ntoh. yes it's a mouthful. no we're not pronouncing it out loud. 💖

✨ NAME ✨

cipso_v4_map_cat_rbm_ntoh — Perform a category mapping from network to host. that's it, that's the whole vibe: net → host, categories get translated, we move on. 🦋

🌸 SYNOPSIS 🌸

int cipso_v4_map_cat_rbm_ntoh (const struct cipso_v4_doi *doi_def ,
const unsigned char *net_cat , u32 net_cat_len , struct
netlbl_lsm_secattr *secattr );

🎀 ARGUMENTS 🎀

  • doi_def — the DOI definition. your blueprint, your little rulebook, your whole reference for how the mapping should go. 👑
  • net_cat — the category bitmap in network/CIPSO format. this is the one that needs translating, bestie. ✨
  • net_cat_len — the length of the CIPSO bitmap in bytes. yes, bytes. count carefully. 📏
  • secattr — the security attributes. this is where the results end up. 🫶

💜 DESCRIPTION 💜

so what are we actually doing here? 💅

We're performing a label mapping to translate a CIPSO bitmap into the correct local MLS category bitmap, using the given DOI definition. that's the whole job. net format in, local MLS categories out, everyone goes home happy. 🌈

Returns zero on success, negative values on failure. so like — 0 is the slay outcome, negatives are the 😭 outcome. no cap.

ngl, check your return value. zero means success. negative means it did not eat. 💀

🦋 SEE ALSO 🦋

okay this list is long — it's giving "the whole friend group showed up to the function." but every single one of them matters, so here we go, no skipping, periodt:

Kernel file ./net/ipv4/cipso_ipv4.c

and that's the page, bestie ✨🫶 — brought to you by the fine folks over at ./net/ipv4, dated October 2026, under the Kernel API Manual banner. go forth and map those categories, iykyk 💖🎀

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