calipso_validate(9)

📦 version 7.3.1, in nixpkgs unstable

💅 calipso_validate(9): validate a CALIPSO option 💅

okay so this one lives in the Kernel API Manual, section 9, and it's literally the vibe check for a CALIPSO option. 🦋 no cap, it's a tiny yes/no bouncer.

💖 NAME 💖

calipso_validate — Validate a CALIPSO option. periodt. ✨

✨ SYNOPSIS ✨

bool calipso_validate (const struct sk_buff *skb , const unsigned char
*option );

🎀 ARGUMENTS 🎀

  • skb — the packet. like, the actual packet, bestie. 📦
  • option — the start of the option. that's the pointer to where the option begins. 🎯

🦋 DESCRIPTION 🦋

This routine is called to validate a CALIPSO option. If the option is valid then true is returned, otherwise false is returned. it's giving boolean bouncer energy. 💅

⚠️ bestie, the caller should have already checked that the length of the option (including the TLV header) is >= 10 and that the catmap length is consistent with the option length. that's on you, not this function. 🫶

We leave checks on the level and categories to the socket layer. yup, socket layer's problem now. 😌

🌈 SEE ALSO 🌈

Kernel file ./net/ipv6/calipso.c, plus the whole calipso squad:

🧚 source/version: ./net/ipv6 · date: October 2026 · page: calipso_validate(9) — ok bye, go validate responsibly 💖

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