skb_gso_vali..._network_len(9)

📦 version 7.3.1, in nixpkgs unstable

💅 skb_gso_vali..._network_len(9) — like, the Kernel API Manual, but make it make sense 🎀

okay so bestie, you opened the Kernel API Manual page for skb_gso_vali..._network_len (yes the name is tragically truncated, we don't talk about it 💀) and honestly? it's a tiny one. one function, two args, one very important little question it answers. let's get into it ✨

🌸 NAME 🌸

skb_gso_validate_network_len — the vibe check that answers: will a split GSO skb actually fit into a given MTU? 🦋

⭐ SYNOPSIS ⭐

bool skb_gso_validate_network_len (const struct sk_buff *skb , unsigned
int mtu );

she takes a const struct sk_buff * and an unsigned int, and she returns a bool. short, sweet, returns true or false, no drama 💅

🎀 ARGUMENTS 🎀

  • skb — the GSO skb in question. the main character, fr fr 👑
  • mtu — the MTU you wanna validate against. the standard she's being held to 🍓

💖 DESCRIPTION 💖

okay so here's the whole thing: skb_gso_validate_network_len validates whether a given skb will fit a wanted MTU once it's split. not before, once split — that's the whole point, that's the assignment, she ate 🔥

and the way that it's thorough? it considers L3 headers, L4 headers, and the payload. all three. no cap, nothing gets left out 🙈

so if you're sitting there like "hmm will this actually fit," she's the one you ask, and she gives you a straight bool back. iconic behavior ngl ⭐

🦋 SEE ALSO 🦋

the kernel file to go peep is ./net/core/gso.c — and while you're in the neighborhood, the whole friend group is here:

iykyk, they all kinda run in the same circle 💜

and that's the page!! 🌈 it lives over in ./net/core, stamped October 2026, and yeah — she's skb_gso_vali..._network_len(9), truncated name and all, and we love her for it 🫶 mwah, go validate some segments bestie 💖✨

📦 where this page comes from