ovpn_udp_socket_attach(9)

📦 version 7.3.1, in nixpkgs unstable

💅 ovpn_udp_socket_attach — Kernel API Manual ✨

okay so bestie, we're deep in the kernel today and this one's a little gem. the page you're on is ovpn_udp_socket_attach(9) from the Kernel API Manual, and it's giving "glue function that makes the whole udp tunnel thing work" energy. let's get into it 🫶

🌸 NAME 🌸

ovpn_udp_socket_attach — set udp-tunnel CBs on socket and link it to ovpn

like, it literally does what it says on the tin: it sets the udp-tunnel callbacks (CBs!!) on a socket and links that socket to ovpn. no notes, iconic behaviour 👑

✨ SYNOPSIS ✨

int ovpn_udp_socket_attach (struct ovpn_socket *ovpn_sock , struct socket *sock , struct ovpn_priv *ovpn );

three args, one int coming back at you. simple. clean. slay 💅

🎀 ARGUMENTS 🎀

  • ovpn_sock — the socket you're configuring. this is the one getting the glow-up ✨
  • sock — the socket container, and like, it's the thing that gets passed to setup_udp_tunnel_sock. that's its whole job, and it ate 🍓
  • ovpn — the openvp instance you're linking to. besties getting officially linked, no cap 🫶

💖 DESCRIPTION 💖

okay so here's the vibe: after you invoke this function, the sock is controlled by ovpn — meaning any incoming packet may be processed by ovpn first. like, ovpn gets first dibs on the packets. main character energy fr fr. 🔥

not me explaining kernel packet flow like it's a group chat but honestly that's exactly what it is: the socket gets handed over, and ovpn becomes the one who reads the messages first 👑

🌈 RETURN 🌈

  • 0 on success 💚
  • or a negative error code otherwise 💀

that's it, that's the whole return contract. negative means something went sideways, so check your error handling bestie, don't just ignore it 🙈

🦋 SEE ALSO 🦋

(psst — ovpn_udp_socket_detach(9) is literally the ex-it era version of this function, iykyk 🧚)

💡 reminder: everything above came from the kernel docs, so keep the exact names and paths when you go look them up. no improvising in the source tree, that's not the vibe ⭐

and that's the whole page, bestie! 🎀 this little beauty lives in ./drivers/net/ovpn and it's dated October 2026 — so mark your calendar, screenshot it, pin it, do whatever you need to do. go forth and attach those sockets 💜

📦 where this page comes from