skb_put(9)

📦 version 7.3.1, in nixpkgs unstable

💅 skb_put — from the Kernel API Manual, bestie 💖

okay so first thing, this page lives in the Kernel API Manual (yes that's the manual's name, we're being fancy today ✨) and it's about skb_put, which is genuinely one of those tiny functions that eats absolutely nothing and does so much. let's get into it 🫶

🌸 NAME 🌸

skb_put — add data to a buffer. that's it. that's the whole vibe check. 💅

✨ SYNOPSIS ✨

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

like, look at her. two args, returns a pointer, no notes. slay. 👑

🎀 ARGUMENTS 🎀

  • skb — the buffer you're working with. your canvas. your main character. 🦋
  • len — how much data you're adding. the amount, the quantity, the how much. 📏

💖 DESCRIPTION 💖

so here's the tea, bestie: this function extends the used data area of the buffer. it literally grows the "data that actually counts" part of the skb. iconic behavior, no cap. 🌱

⚠️ okay but real talk for a second — if this would exceed the total buffer size, the kernel will panic. not like a cute little error return, not like a warning log, a full on panic. the whole thing. 💀 so please, for the love of everything, know your bounds before you call her. 🙈

and the glow-up? it returns a pointer to the first byte of the extra data. so you can go ahead and write into that fresh new space. literally handing you the keys. 🔥

🌈 SEE ALSO 🌈

this function lives in the Kernel file ./net/core/skbuff.c, and it's surrounded by so many friends, i'm obsessed. here's the whole group chat, nobody gets left out 🫶:

like, that's a whole ecosystem. iykyk. 💜

okay that's the page!! quick sign-off from your girl: this one's sourced from ./net/core, dated October 2026, and it's the skb_put(9) page, so if you cite it in your PR description you'll look extremely educated. go forth and don't panic the kernel, bestie 😭💖✨

📦 where this page comes from