tcp_make_synack(9)

💅 tcp_make_synack(9) — Kernel API Manual, bestie edition ✨

okay so welcome to the Kernel API Manual, bestie 🫶. This is the page for tcp_make_synack(9), and it is literally giving “allocate one skb and build a SYNACK packet” main character energy 👑. Every deet from the original is still here, just with way more sparkle.

🌸 NAME 🌸

tcp_make_synack — Allocate one skb and build a SYNACK packet. 💖

🦋 SYNOPSIS 🦋

struct sk_buff * tcp_make_synack (const struct sock *sk , struct
       dst_entry *dst , struct request_sock *req , struct tcp_fastopen_cookie
       *foc , enum tcp_synack_type synack_type , struct sk_buff *syn_skb );

💜 ARGUMENTS 💜

• sk — listener socket 🎧. Like, the socket that is listening, bestie.
• dst — the dst entry attached to the SYNACK. ⚠️ It is consumed, and the caller should not use it again — no take-backs, no double-dipping, fr fr. 💀
• req — a request_sock pointer 📌.
• foc — cookie for tcp fast open 🍪.
• synack_type — Type of synack to prepare 🛠️.
• syn_skb — the SYN packet just received. It could be NULL for the rtx case 🌈.

🎀 SEE ALSO 🎀

• Kernel file ./net/ipv4/tcp_output.c 📂
• tcp_release_cb(9) 🔁

💌 cute sign-off: brought to you by ./net/ipv4, dated October 2026, and starring tcp_make_synack(9) — periodt, bestie 🫶✨