skb_pull_rcsum(9)

📦 version 7.3.1, in nixpkgs unstable

💅 skb_pull_rcsum(9)

okay bestie, welcome to the Kernel API Manual — we're doing a little skb_pull_rcsum moment and honestly it's giving "tiny function, big responsibility" energy 🎀

✨ NAME ✨

skb_pull_rcsum — pull the skb and update the receive checksum, both at once, no cap 🫶

🌸 SYNOPSIS 🌸

void * skb_pull_rcsum (struct sk_buff *skb , unsigned int len );

like literally just two args, she's lowkey minimal 💅

🦋 ARGUMENTS 🦋

  • skb — the buffer you're updating, your main character fr 💖
  • len — how much data got pulled, i.e. the length of data pulled

⭐ DESCRIPTION ⭐

So what she actually does: this function performs an skb_pull on the packet and updates the CHECKSUM_COMPLETE checksum. two jobs, one call, iconic behavior honestly 👑

And listen — you should be using this on receive path processing instead of plain skb_pull 🌈 unless you know for a fact that the checksum difference is zero (think: a valid IP header, that kind of situation), or you're setting ip_summed to CHECKSUM_NONE.

let me say that again because it matters: receive path? use this. skipping the checksum math? only if the difference is genuinely zero or you're going CHECKSUM_NONE. don't be out here guessing 🙈

💜 SEE ALSO 💜

Kernel file ./net/core/skbuff.c 💀 (yes, that's where she lives) — plus the whole extended friend group:

like that's a whole friend group chat and she's in every one of em 😭💖

🧚 sign-off 🧚

and that's the page!! this one came from ./net/core, dated October 2026 — so yeah, mark your calendar bestie, and go pull some skbs responsibly 💅✨🍓

📦 where this page comes from