STRUCT UDP_TUNNEL_NIC(9)

✨ struct udp_tunnel_nic(9) ✨

okay so bestie, welcome to the struct udp_tunnel_nic page — it lives in section 9 (that's the Kernel API Manual, iykyk) and it's literally the entire vibe of UDP tunnel port offload state 🫶

🌸 NAME 🌸

struct udp_tunnel_nic — UDP tunnel port offload state 💅

🦋 SYNOPSIS 🦋

struct udp_tunnel_nic {
    struct delayed_work work;
    struct net_device *dev;
    struct mutex lock;
    u8 need_sync:1;
    u8 need_replay:1;
    unsigned int n_tables;
    unsigned long missed;
    struct udp_tunnel_nic_table_entry *entries[];
 };

🎀 Members 🎀

• work — the async work that talks to the hardware from process context. not me calling it "talking to hardware" like it's a group chat, but fr that's the job 💀
• dev — the netdev pointer. the main character of this whole struct, ngl 👑
• lock — protects all the fields. every single one. do not skip the lock, bestie, that's the whole point 🙈
• need_sync — a u8 bitfield that's set when at least one port start changed ✨
• need_replay — a u8 bitfield that's set when space was freed and we need a replay of all ports. so basically a "we gotta run it back" flag 🌀
• n_tables — the number of tables under entries. the way this is an unsigned int and not a bitfield… slay 🎀
• missed — a bitmap of tables which overflown. yes it's spelled "overflown" in the original, we're not fixing it, it ate 💅
• entries — a table of tables of ports currently offloaded. tables within tables, it's giving inception, it's giving nesting, it's giving [] flexible array member 🌈

💜 SEE ALSO 💜

• Kernel file ./net/ipv4/udp_tunnel_nic.c — go read it, that's where the lore lives 📖✨

and that's the page, bestie!! 🎀💖 no cap, you now know the whole struct. the source is ./net/ipv4, dated October 2026, and honestly? iconic. go forth and offload those UDP tunnel ports 🦋⭐💅