vti6_siocdevprivate(9)

📦 version 7.3.1, in nixpkgs unstable

💖 vti6_siocdevprivate(9) — the kernel API manual, but make it make sense 💖

okay so bestie, welcome to vti6_siocdevprivate(9) from the Kernel API Manual ✨ this is the little function that lets userspace boss around your vti6 tunnels, and honestly? she's giving gatekeeper energy 👑

🌸 NAME 🌸

vti6_siocdevprivate — configure vti6 tunnels from userspace 🎀

✨ SYNOPSIS ✨

int vti6_siocdevprivate (struct net_device *dev , struct ifreq *ifr ,
void __user *data , int cmd );

🫶 ARGUMENTS 🫶

  • dev — the virtual device that's associated with the tunnel 💅
  • ifr — literally unused, she's just here for the vibes 🙈
  • data — the parameters passed in from userspace 🍓
  • cmd — the command you want performed 👑

🦋 DESCRIPTION 🦋

so vti6_siocdevprivate is the function you use for managing vti6 tunnels from userspace. no cap, that's her whole job 💜

the possible commands are these, and yes you need to know all of them:

  • SIOCGETTUNNEL — get tunnel parameters for device
  • SIOCADDTUNNEL — add tunnel matching given tunnel parameters
  • SIOCCHGTUNNEL — change tunnel parameters to those given
  • SIOCDELTUNNEL — delete tunnel

and here's a cute detail: the fallback device "ip6_vti0", created during module initialization, can be used for creating other tunnel devices 🌈 iconic behaviour tbh

🔥 RETURN 🔥

  • 0 on success ✨ we love a clean win
  • -EFAULT if unable to copy data to or from userspace 😭
  • -EPERM if current process hasn't CAP_NET_ADMIN set 💀 (no permission, no tunnel, sorry bestie)
  • -EINVAL if passed tunnel parameters are invalid 🙈
  • -EEXIST if changing a tunnel's parameters would cause a conflict 😬
  • -ENODEV if attempting to change or delete a nonexisting device 👻
fr fr, that -EPERM one will get you if you forgot CAP_NET_ADMIN — check it before you start blaming the tunnel 💅

💀 SEE ALSO 💀

Kernel file ./net/ipv6/ip6_vti.c — go read the source, she ate 👑

and that's the whole page, bestie 🌟 this one came from ./net/ipv6, dated October 2026, and it lives under the name vti6_siocdevprivate(9) — go forth and configure those tunnels, mwah 💋🎀

📦 where this page comes from