parse_vlan_tag(9)

🦋 parse_vlan_tag(9) 🦋

okay so bestie, welcome to the Kernel API Manual page for parse_vlan_tag — it's literally the function that parses a vlan tag from a vlan header, and we're gonna get into it together 💅✨.

🌸 NAME 🌸

parse_vlan_tag — it's giving "parse vlan tag from vlan header" energy, fr fr. That's the whole name-and-purpose situation 🎀.

✨ SYNOPSIS ✨

int parse_vlan_tag (struct sk_buff *skb , struct vlan_head *key_vh ,
       bool untag_vlan );

That's the signature, character for character — don't come for me about the spaces, they're part of the look 😭.

🎀 ARGUMENTS 🎀

• skb — the skb containing the frame to parse. Yes bestie, that's the input frame vibe.
• key_vh — pointer to parsed vlan tag. It's where the parsed tag goes.
• untag_vlan — should the vlan header be removed from the frame? This bool is literally answering that question.

💖 RETURN 💖

• ERROR on memory error — memory said no 😭.
• 0 if it encounters a non-vlan or incomplete packet — so not every packet is gonna slay.
• 1 after successfully parsing vlan tag — success era, periodt.

🔥 SEE ALSO 🔥

The SEE ALSO vibes point you at the kernel file ./net/openvswitch/flow.c, plus get_ipv6_ext_hdrs(9), key_extract_l3l4(9), and key_extract(9) — go read those when you're done here, iykyk 👑.

mwah 💋 source/version-and-date sign-off: this page comes from ./net/openvswitch, dated October 2026, and it's the parse_vlan_tag(9) page — periodt, that's the footer folded in with love 🫶🌈