eth_type_vlan(9)

💅 eth_type_vlan(9) — the kernel API manual, bestie edition 🎀

okay so bestie, welcome to eth_type_vlan(9) — this one lives in the Kernel API Manual and it's honestly such a tiny little icon. like it does one (1) thing and it does it flawlessly, we love a low-maintenance queen 👑

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✨ NAME ✨

eth_type_vlan — check for valid vlan ether type.

that's it. that's the whole job. she checks, she returns a bool, she leaves. main character energy but make it minimal 🌸

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🦋 SYNOPSIS 🦋

bool eth_type_vlan (__be16 ethertype );

literally one argument, one return value, no drama. the __be16 is right there in the signature so keep it exactly like that, no cap 💅

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🍓 ARGUMENTS 🍓

• ethertype — the ether type you're checking, bestie. that's the vibe. you hand it over and she does her little check 🫶

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⭐ RETURN ⭐

returns true if the ether type is a vlan ether type 💖

that's the whole contract. true = vlan ether type, and if it's not, well… it's not true, iykyk 🙈

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🔥 SEE ALSO 🔥

okay this is the part where the friend group shows up, and ngl it's a large friend group. every single one of these, no skips, no cuts 👑

• struct vlan_ethhdr(9)
• struct vlan_pcpu_stats(9)
• struct vlan_priority_tci_mapping(9)
• struct vlan_dev_priv(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(9)
• skb_vlan_tagged_multi(9)
• vlan_features_check(9)
• compare_vlan_header(9)

the whole vlan cinematic universe fr fr 🌈

and don't forget the kernel file she lives in:

./include/linux

heads up bestie: all of the above are documented in ./include/linux/if_vlan.h — that's the source of truth, go read it if you want the full lore 📖✨

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mwah 💜 that's the page! this icon dropped in October 2026, ships out of ./include/linux, and answers to the name eth_type_vlan(9) — go forth and check those ether types, bestie, you're gonna slay 🧚‍♀️💖