__nla_put_nohdr(9)

📦 version 7.3.1, in nixpkgs unstable

✨ __nla_put_nohdr — the Kernel API Manual glow-up 💅

okay so bestie, welcome to the __nla_put_nohdr(9) page, it's giving "tiny function, huge responsibility" and honestly? iconic.

🌸 NAME 🌸

__nla_put_nohdr — adds a netlink attribute, but like… without the header. no cap, that's the whole vibe. 🎀

🦋 SYNOPSIS 🦋

void __nla_put_nohdr (struct sk_buff *skb , int attrlen , const void *data );

that's it, that's the signature. short, sweet, and absolutely not gonna hold your hand about tailroom. 😭

💖 ARGUMENTS 💖

  • skb — the socket buffer you're adding the attribute to. it's the main character here, everything happens inside it. 🫶
  • attrlen — how long the attribute payload is. literally just the length, bestie. 🔥
  • data — the head of the attribute payload, aka where your actual bytes start. 💜

✨ DESCRIPTION ✨

okay so here's the tea: the caller is responsible for making sure the skb has enough tailroom for the attribute payload. that's on you, not the function. no vibes-based checking, no safety net — it's giving "trust fall but the floor is memory corruption" 💀

so like… pls pls pls check your tailroom first. the function is not gonna do it for you and it will not be cute. 🌸

🔥 SEE ALSO 🔥

all the siblings in the kernel file ./lib/nlattr.c, and yes there are a lot of them — the whole netlink attribute fam came out to support you:

like an entire friend group in lib/nlattr.c, and you can meet them all. iykyk 🧚

so yeah, that's the page! it's from the ./lib section of the Kernel API Manual, dated October 2026, and the header line everybody knows is __nla_put_nohdr(9). slay, go forth, and please check your tailroom. periodt. 💅👑

📦 where this page comes from