batadv_mcast...tvlv_handler(9)

💖 batadv_mcast...tvlv_handler(9) 💖

okay bestie, so this is a page from the Kernel API Manual — the batadv_mcast...tvlv_handler(9) one — and it's genuinely one of those little functions that does a LOT of heavy lifting, so let's get into it 🫶

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✨ NAME ✨

batadv_mcast_forw_tracker_tvlv_handler — literally handles an mcast tracker tvlv. that's the whole vibe 💅

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🌸 SYNOPSIS 🌸

int batadv_mcast_forw_tracker_tvlv_handler (struct batadv_priv *bat_priv
, struct sk_buff *skb );

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🎀 ARGUMENTS 🎀

• bat_priv — the bat priv, aka the glow-up container holding all the mesh interface information 👑
• skb — the received batman-adv multicast packet, freshly arrived, main character energy ⭐

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🦋 DESCRIPTION 🦋

so what it actually does: it parses the tracker TVLV of an incoming batman-adv multicast packet, and then forwards the packet exactly as that TVLV says to. no cap, it just reads the vibe check and sends it on ✨

now the important part — the contract with whoever's calling this (that's you, bestie, so listen up 🙈):

• the caller needs to set the skb network header to the start of the multicast tracker TVLV — and that's excluding the generic TVLV header, k? 💀
• the caller also needs to set the skb transport header to the next byte after this multicast tracker TVLV 🎯
• and the caller needs to free the skb. yes, that's on you. don't leave it hanging 😭

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🔥 RETURN 🔥

so it returns NET_RX_SUCCESS or NET_RX_DROP on success, or a negative error code on failure 💜

and the tea on the two success-ish ones:

• NET_RX_SUCCESS — the received packet is supposed to be decapsulated and forwarded to the own mesh interface 🥳
• NET_RX_DROP — otherwise. it's getting dropped, bestie, that's just how it is 💀

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🌈 SEE ALSO 🌈

go look at the actual kernel file, it's right here:

./net/batman-adv/multicast_forw.c

and then the whole squad of sibling functions, all of them, every single one, because they're all iconic in their own way 👑:

• batadv_mcast_forw_skb_push(9)
• batadv_mcast_forw_push_padding(9)
• batadv_mcast_forw_push_est_padding(9)
• batadv_mcast_forw_orig_entry(9)
• batadv_mcast_forw_push_dest(9)
• batadv_mcast_forw_push_dests_list(9)
• batadv_mcast_forw_push_tt(9)
• batadv_mcast_forw_push_want_all(9)
• batadv_mcast_forw_push_want_rtr(9)
• batadv_mcast_forw_scrape(9)
• batadv_mcast_forw_push_scrape_padding(9)
• batadv_mcast_forw_push_insert_padding(9)
• batadv_mcast_forw_push_adjust_padding(9)
• batadv_mcast_forw_push_dests(9)
• batadv_mcast_forw_push_tracker(9)
• batadv_mcast_forw_push_tvlvs(9)
• batadv_mcast_forw_push_hdr(9)
• batadv_mcast_forw_scrub_dests(9)
• batadv_mcast_forw_shrink_fill(9)
• batadv_mcast_forw_shrink_pack_dests(9)
• batadv_mcast_forw_shrink_align_offset(9)
• batadv_mcast_forw_shrink_update_headers(9)
• batadv_mcast_forw_shrink_move_headers(9)
• batadv_mcast_forw_shrink_tracker(9)
• batadv_mcast_forw_packet(9)
• batadv_mcast_forw_packet_hdrlen(9)
• batadv_mcast_forw_expand_head(9)
• batadv_mcast_forw_push(9)
• batadv_mcast_forw_mcsend(9)

ngl that's a long list but every one of them is doing something, so go read them, iykyk 🧚

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mwah 💋 that's the page — brought to you by the fine folks at ./net/batman-adv, dated October 2026, and yes this whole thing is batadv_mcast...tvlv_handler(9) and it ate 💅✨