batadv_mcas...e_check_ipv6(9)

🦋 batadv_mcast_forw_mode_check_ipv6(9) — Kernel API Manual 🦋

okay so bestie, we're in the Kernel API Manual today and the star of the show is batadv_mcast_forw_mode_check_ipv6. no cap, it's giving "tiny function, big job" energy ✨

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💜 NAME 💜

batadv_mcast_forw_mode_check_ipv6 — check for optimized forwarding potential 🎀

like, it literally just peeks at a packet and goes "hmm, could this be forwarded smarter?" 🔥

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🌸 SYNOPSIS 🌸

int batadv_mcast_forw_mode_check_ipv6 (struct batadv_priv *bat_priv ,
struct sk_buff *skb , bool *is_unsnoopable , int *is_routable );

the way that signature just sits there with four arguments... main character energy fr fr 💅

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🌈 ARGUMENTS 🌈

• bat_priv — the bat priv with all the mesh interface information 🫶 like, the whole mesh's vibe lives in here
• skb — the IPv6 packet to check 📦 the one we're ✨judging✨
• is_unsnoopable — stores whether the destination is snoopable 👀 yes, it gets written to, that's the whole point
• is_routable — stores whether the destination is routable 🧭 likewise, output goes here

ngl, those last two are out-params, so bring your pointers bestie 🙈

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⭐ DESCRIPTION ⭐

Checks whether the given IPv6 packet has the potential to be forwarded with a mode more optimal than classic flooding 🌊➡️🎯

that's it, that's the job. it's a vibe check for your packet — is classic flooding the move, or can we do better? iykyk 💫

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💀 RETURN 💀

If so then 0 🎉 (slay). Otherwise -EINVAL 🤨 or -ENOMEM if we are out of memory 😭 (literally the worst).

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🧚 SEE ALSO 🧚

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

• batadv_mcast_start_timer(9)
• batadv_mcast_get_bridge(9)
• batadv_mcast_mla_rtr_flags_meshif_get_ipv4(9)
• batadv_mcast_mla_rtr_flags_meshif_get_ipv6(9)
• batadv_mcast_mla_rtr_flags_meshif_get(9)
• batadv_mcast_mla_rtr_flags_bridge_get(9)
• batadv_mcast_mla_rtr_flags_get(9)
• batadv_mcast_mla_forw_flags_get(9)
• batadv_mcast_mla_flags_get(9)
• batadv_mcast_mla_is_duplicate(9)
• batadv_mcast_mla_meshif_get_ipv4(9)
• batadv_mcast_mla_meshif_get_ipv6(9)
• batadv_mcast_mla_meshif_get(9)
• batadv_mcast_mla_br_addr_cpy(9)
• batadv_mcast_mla_bridge_get(9)
• batadv_mcast_mla_list_free(9)
• batadv_mcast_mla_tt_retract(9)
• batadv_mcast_mla_tt_add(9)
• batadv_mcast_querier_log(9)
• batadv_mcast_bridge_log(9)
• batadv_mcast_flags_log(9)
• batadv_mcast_mla_flags_update(9)
• __batadv_mcast_mla_update(9)
• batadv_mcast_mla_update(9)
• batadv_mcast_is_report_ipv4(9)
• batadv_mcast_forw_mode_check_ipv4(9)
• batadv_mcast_is_report_ipv6(9)
• batadv_mcast_forw_mode_check(9)
• batadv_mcast_forw_want_all_ip_count(9)
• batadv_mcast_forw_rtr_count(9)
• batadv_mcast_forw_mode_by_count(9)
• batadv_mcast_forw_mode(9)
• batadv_mcast_forw_send_orig(9)
• batadv_mcast_forw_tt(9)
• batadv_mcast_forw_want_all_ipv4(9)
• batadv_mcast_forw_want_all_ipv6(9)
• batadv_mcast_forw_want_all(9)
• batadv_mcast_forw_want_all_rtr4(9)
• batadv_mcast_forw_want_all_rtr6(9)
• batadv_mcast_forw_want_rtr(9)
• batadv_mcast_forw_send(9)
• batadv_mcast_want_unsnoop_update(9)
• batadv_mcast_want_ipv4_update(9)
• batadv_mcast_want_ipv6_update(9)
• batadv_mcast_want_rtr4_update(9)
• batadv_mcast_want_rtr6_update(9)
• batadv_mcast_have_mc_ptype_update(9)
• batadv_mcast_tvlv_flags_get(9)
• batadv_mcast_tvlv_ogm_handler(9)
• batadv_mcast_init(9)
• batadv_mcast_mesh_info_put(9)
• batadv_mcast_flags_dump_entry(9)
• batadv_mcast_flags_dump_bucket(9)
• __batadv_mcast_flags_dump(9)
• batadv_mcast_netlink_get_primary(9)
• batadv_mcast_flags_dump(9)
• batadv_mcast_free(9)
• batadv_mcast_purge_orig(9)

like, that's a lot of friends and we stan every single one 🍓

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okay that's the whole page bestie, no gatekeeping 💖 this one came out of ./net/batman-adv and it's dated October 2026 — and yeah, batadv_mcas...e_check_ipv6(9) is the exact same function you just read about, the header and footer are just built different 💅 periodt 🎀