security_xfrm_policy_lookup(9)

📦 version 7.3.1, in nixpkgs unstable

✨ security_xfrm_policy_lookup(9) ✨

okay bestie, welcome to the Kernel API Manual entry for security_xfrm_policy_lookup. this one is short and sweet: it’s literally checking if using a xfrm policy is allowed, and I’m obsessed with how tidy it is. 💅

🌸 NAME 🌸

security_xfrm_policy_lookup — check if using a xfrm policy is allowed. periodt. 💖

🦋 SYNOPSIS 🦋

int security_xfrm_policy_lookup (struct xfrm_sec_ctx *ctx , u32 fl_secid
);

🎀 ARGUMENTS 🎀

  • ctx — target xfrm security context. 🫶
  • fl_secid — flow secid used to authorize access. 🔐

✨ DESCRIPTION ✨

so here’s the vibe: this hook checks permission when a flow selects a xfrm_policy for processing XFRMs on a packet. it gets called when selecting either a per-socket policy or a generic xfrm policy. no cap, that’s the whole plot. 🌈

💜 RETURN 💜

returns 0 if permission is granted, -ESRCH otherwise, or -errno on other errors. bestie, that’s the whole return arc. 😭

👑 SEE ALSO 👑

the SEE ALSO crew is huge, so buckle up. the Kernel file in the mix is ./security/security.c, and here’s the whole reference squad in order:

xoxo, your kernel bestie 💖 — this page came from source/version ./security, dated October 2026, and it’s literally security_xfrm_policy_lookup(9). 🎀✨

📦 where this page comes from