skb_vlan_tagged(9)

💅 skb_vlan_tagged(9)

okay so bestie, welcome to the kernel API manual page for skb_vlan_tagged — yes it's a real page, yes it's a (9) section situation (kernel internals, we love that for us), and yes I'm gonna walk you through it like we're texting at 2am 🫶

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✨ NAME ✨

skb_vlan_tagged — check if skb is vlan tagged.

That's it. That's the whole gig. It's a little yes/no girlie and honestly? Iconic. 🎀

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🌸 SYNOPSIS 🌸

bool skb_vlan_tagged (const struct sk_buff *skb );

literally just hand it an skb and it tells you a yes-or-no answer. no drama, no side effects, no cap. ✨

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🦋 ARGUMENTS 🦋

• skb — the skbuff to query 💖 this is the thing you're asking the question about. it's a const struct sk_buff *, so we're not out here mutating anything, we're just looking. respectful. we stan. 👑

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⭐ RETURN ⭐

returns true if the skb is tagged — regardless of whether it is hardware accelerated or not.

like, read that again bestie because it matters: it does not care how the tag got there. hardware accelerated? cool. not hardware accelerated? also cool. tagged is tagged, periodt. 🔥

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💜 SEE ALSO 💜

the whole vlan friend group, fr fr — the kernel file ./include/linux/if_vlan.h plus:

• struct vlan_ethhdr(9)
• struct vlan_pcpu_stats(9)
• struct vlan_priority_tci_mapping(9)
• struct vlan_dev_priv(9)
• eth_type_vlan(9)
• __vlan_insert_inner_tag(9)
• __vlan_insert_tag(9)
• vlan_insert_inner_tag(9)
• vlan_insert_tag(9)
• vlan_insert_tag_set_proto(9)
• __vlan_hwaccel_clear_tag(9)
• __vlan_hwaccel_copy_tag(9)
• __vlan_hwaccel_put_tag(9)
• __vlan_get_tag(9)
• __vlan_hwaccel_get_tag(9)
• vlan_get_tag(9)
• vlan_get_protocol_offset_inline(9)
• vlan_get_protocol(9)
• vlan_remove_tag(9)
• skb_vlan_tagged_multi(9)
• vlan_features_check(9)
• compare_vlan_header(9)

that's 22 whole pages of vlan lore. go read them. or don't. but they're there for you 🧚💫

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ngl if you only remember one thing: this function answers "is it tagged?" and nothing else. don't ask it to tell you what the tag is. that's somebody else's job. 🙈

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okay that's the page!! this gem lives in ./include/linux and the version/date on the tin is October 2026 — mwah, bye, slay, go tag something 💅💖🌈