vlan_insert_tag_set_proto(9)

📦 version 7.3.1, in nixpkgs unstable

💖 vlan_insert_tag_set_proto(9) — Kernel API Manual 💖

okay so bestie, welcome to the kernel API manual page for vlan_insert_tag_set_proto — she's giving "regular VLAN tag inserting" and honestly she ate ✨

🌸 NAME 🌸

vlan_insert_tag_set_proto — regular VLAN tag inserting 🎀 (yes, "regular" — she's not doing anything extra, she's just doing her job)

🦋 SYNOPSIS 🦋

struct sk_buff * vlan_insert_tag_set_proto (struct sk_buff *skb , __be16
vlan_proto , u16 vlan_tci );

like literally that's the whole signature, copy it exactly please, no typos, slay 💅

💜 ARGUMENTS 💜

  • skb — the skbuff you're tagging, that's her, that's the main character 🫶
  • vlan_proto — the VLAN encapsulation protocol (which flavor of VLAN vibes we're working with) 🌈
  • vlan_tci — the VLAN TCI you want to insert, the actual goods 💖

✨ DESCRIPTION ✨

So what she does: she inserts the VLAN tag into skb as part of the payload, and hands you back a VLAN tagged skb. no cap 🎀

⚠️ heads up bestie — this might change skb->head. so don't be out here holding onto pointers into that memory like it's a fixed address, because it is not 💀

Then we get the error-handling lore. Following the skb_unshare example, in case of error, the calling function doesn't have to worry about freeing the original skb. so you don't have to do the cleanup girlboss dance yourself, she's got it 😭🫶

🔥 RETURN 🔥

  • modified skb on success 🎉
  • NULL on error — and skb is freed in that case 💀

so yeah, check your return value. NULL means the skb is gone-gone, don't touch her 🙈

🧚 SEE ALSO 🧚

Kernel file ./include/linux/if_vlan.h — that's where all her friends live ✨

the whole friend group, iconic 👑 (and there's a lot of them, iykyk)

that's the page bestie!! 🍓 this one's out of ./include/linux, dated October 2026, and she's the vlan_insert_tag_set_proto(9) page 💅✨ go tag some skbs, you've got this 🫶💖

📦 where this page comes from