batadv_gw_dh...ecipient_get(9)

📦 version 7.3.1, in nixpkgs unstable

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

okay so bestie, buckle up, because we're diving into batadv_gw_dhcp_recipient_get from the Kernel API Manual and honestly? she's lowkey iconic. this one's a little detective function — it peeks at a packet and tells you if it's a DHCP message and which way it's headed 🕵️‍♀️✨

🌸 NAME 🌸

batadv_gw_dhcp_recipient_get — literally just checks if a packet is a DHCP message, no cap 💅

🦋 SYNOPSIS 🦋

enum batadv_dhcp_recipient batadv_gw_dhcp_recipient_get (struct sk_buff
*skb , unsigned int *header_len , u8 *chaddr );

🎀 ARGUMENTS 🎀

  • skb — the packet we're snooping on, bestie. this is the one getting the vibe check 🕵️‍♀️
  • header_len — a pointer to the batman-adv header size, so she knows how much to account for
  • chaddr — the buffer where the client address gets stashed. valid only if the function returns BATADV_DHCP_TO_CLIENT 👑 (like, don't go reading it otherwise, iykyk)

💖 DESCRIPTION 💖

⚠️ warning warning warning 🚨 — this function may reallocate the skb data buffer via pskb_may_pull/... so like, any pointer into the skb data (e.g. one you got from skb->data or eth_hdr) from before this call? consider it invalidated afterwards 💀 you have to reacquire it. no reusing stale pointers, that's not the vibe, fr fr.

🔥 RETURN 🔥

she returns one of three things, and each one is a whole mood:

  • BATADV_DHCP_NO — nope, not a dhcp message, OR there was an error while parsing it 😭 (either way, not it)
  • BATADV_DHCP_TO_SERVER — ooh she's a message going to the DHCP server ✨
  • BATADV_DHCP_TO_CLIENT — and this one's going to a DHCP client 🫶 (this is the one where chaddr is actually valid, remember!)

🌈 SEE ALSO 🌈

kernel file ./net/batman-adv/gateway_client.c — go read it, she ate 👑

this whole squad of functions, all together, main character energy:

and that's the whole page, bestie 🎀 this lil drop comes to you from ./net/batman-adv, dated October 2026 — slay, go forth and parse those DHCP packets responsibly 💜✨

📦 where this page comes from