batadv_mcast_forw_packet(9)

📦 version 7.3.1, in nixpkgs unstable

💖 batadv_mcast_forw_packet — like, the manual page, bestie 💖

okay so this is a page from the Kernel API Manual (the batadv_mcast_forw_packet(9) one, yes THAT one) and I'm gonna walk you through it like we're on FaceTime at 2am. grab a snack. 🍓

✨ NAME ✨

batadv_mcast_forw_packet — forward a batman-adv multicast packet. that's it. that's the whole job. she's a forwarder. 💅

🦋 SYNOPSIS 🦋

int batadv_mcast_forw_packet (struct batadv_priv *bat_priv , struct
sk_buff *skb , bool local_xmit );

look at her. three args, returns an int. no cap, she's compact. ✨

🎀 ARGUMENTS 🎀

  • bat_priv — the bat priv holding ALL the mesh interface information. she's the main character, she knows everything about the mesh. 👑
  • skb — the received or locally generated batman-adv multicast packet. either way, it's the packet in question. 🦋
  • local_xmit — a bool that says "hey, this packet was locally generated, it wasn't received." so like, did we make this or did it arrive? this flag tells you. 🌸

💜 DESCRIPTION 💜

so what does she actually DO? she parses the tracker TVLV of a batman-adv multicast packet and forwards the packet as indicated in that there TVLV. iconic behaviour honestly. 🔥

now listen, caller, because these are on you, not her:

  • you need to set the skb network header to the start of the multicast tracker TVLV — and that's excluding the generic TVLV header, don't forget the excluding part bestie 😭
  • you also need to set the skb transport header to the next byte after this multicast tracker TVLV. like, the very next byte. no skipping.
also — and I need you to hear me on this — the caller needs to free the skb. that's your job. not hers. don't leave her hanging with a leaked skb, that's not the vibe. 💀

🌈 RETURN 🌈

  • NET_RX_SUCCESS or NET_RX_DROP on success, or a negative error code on failure. 🙈
  • NET_RX_SUCCESS — the received packet is supposed to be decapsulated and forwarded to the own mesh interface. slay, it's coming home. 🫶
  • NET_RX_DROP — otherwise. drop it, girl. ⭐

🧚 SEE ALSO 🧚

the kernel file, obviously:

  • Kernel file ./net/batman-adv/multicast_forw.c

and now the extended family — she has SO many siblings, it's giving huge family group chat:

that's the whole page bestie, you ate that 🫶 go forth and forward your multicasts responsibly. periodt. 💅

this lil masterpiece lives in ./net/batman-adv, dated October 2026, and it's the batadv_mcast_forw_packet(9) page from the Kernel API Manual — mwah, love u, bye 💖✨

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