cipso_v4_map_cat_rng_valid(9)

📦 version 7.3.1, in nixpkgs unstable

🌸 cipso_v4_map_cat_rng_valid(9) 🌸

okay so this one's from the Kernel API Manual, section 9, and it's basically the vibe check for CIPSO categories 💅 like before you let a category list through the door, this function peeks at it and goes "mmm, valid or not?" — no cap.

✨ NAME ✨

cipso_v4_map_cat_rng_valid — checks to see if the categories are valid 🎀

🦋 SYNOPSIS 🦋

int cipso_v4_map_cat_rng_valid (const struct cipso_v4_doi *doi_def ,
const unsigned char *rngcat , u32 rngcat_len );

🍓 ARGUMENTS 🍓

  • doi_def — the DOI definition 👑 like the rulebook you're checking against
  • rngcat — category list, the actual list of categories under review 📋
  • rngcat_len — length of the category list in bytes, so we know how far to read 🔢

💜 DESCRIPTION 💜

Checks the given categories against the given DOI definition, bestie. That's the whole gig.

And the return value is giving main character energy:

  • returns a negative value if any of the categories do not have a valid mapping 😭
  • returns a zero value if all of the categories are valid ✅ slay
fr fr, that's the entire contract — negative means "nope, at least one category is unmapped", zero means "all good, we're so back".

🔥 SEE ALSO 🔥

Kernel file ./net/ipv4/cipso_ipv4.c — and honestly the whole CIPSO friend group is here, so let me introduce you 💖

iykyk 🫶 go read them, they're iconic.

okay that's the whole page, mwah 💋 this came out of ./net/ipv4 and it's dated October 2026 — periodt, that's the sign-off, bestie, go validate some categories ✨

📦 where this page comes from