batadv_get_vid(9)

✨ batadv_get_vid(9) — the Kernel API Manual glow-up ✨

okay so bestie, welcome to the batadv_get_vid page from the Kernel API Manual 💅 this one is short but it's lowkey important, so grab your iced coffee and let's get into it 🎀

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🌸 NAME 🌸

batadv_get_vid — literally just pulls the VLAN identifier out of the skb, if there even is one 🦋

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🌈 SYNOPSIS 🌈

unsigned short batadv_get_vid (struct sk_buff *skb , size_t header_len );

like, that's the whole signature, she's cute, she's compact 💖

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💜 ARGUMENTS 💜

• skb — the buffer that's holding the packet 🫶
• header_len — how long the batman header is, the one sitting right before the ethernet header 📏

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⭐ DESCRIPTION ⭐

so here's the tea ☕ — the caller has to make sure that at least header_len + ETH_HLEN bytes are actually accessible after skb->data. that's on you, not on her, okay? 👑

⚠️ WARNING, and I mean this fr fr — this function may reallocate the skb data buffer via pskb_may_pull/... so like, any pointer into the skb data (think: whatever you grabbed from skb->data or eth_hdr) that you had before this call? consider it invalid afterwards 💀 it has to be reacquired, no cap. do not keep using the old one, she is gone 🪦

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🦋 RETURN 🦋

she gives you back the VID with the BATADV_VLAN_HAS_TAG flag when the packet embedded in the skb is vlan tagged 💅 otherwise it's BATADV_NO_FLAGS, and that's that 🌸

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🎀 SEE ALSO 🎀

Kernel file ./net/batman-adv/main.c and honestly the whole friend group:

• batadv_init(9)
• batadv_exit(9)
• batadv_mesh_init(9)
• batadv_mesh_free(9)
• batadv_is_my_mac(9)
• batadv_max_header_len(9)
• batadv_skb_set_priority(9)
• batadv_recv_unhandled_packet(9)
• batadv_batman_skb_recv(9)
• batadv_recv_handler_init(9)
• batadv_recv_handler_register(9)
• batadv_recv_handler_unregister(9)
• batadv_vlan_ap_isola_get(9)
• batadv_throw_uevent(9)

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and that's the page!! 🥳 source is ./net/batman-adv, dated October 2026 — go be iconic with your skb pointers, bestie, and remember: reacquire after the pull or it's giving undefined 💀✨🫶