batadv_mcast_forw_want_all(9)

💅 batadv_mcast_forw_want_all(9) 💅

okay so bestie, this is a page from the Kernel API Manual — yes, the big one — and it's all about batadv_mcast_forw_want_all. it's a batman-adv thing. buckle up 🦋

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✨ NAME ✨

batadv_mcast_forw_want_all — forward packet to nodes in a want-all list 🎀

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🌸 SYNOPSIS 🌸

int batadv_mcast_forw_want_all (struct batadv_priv *bat_priv , struct
       sk_buff *skb , unsigned short vid );

like, that's the whole signature. three args. she's compact. periodt ✨

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🎀 ARGUMENTS 🎀

• bat_priv — the bat priv with all the mesh interface information 🫶 literally the whole vibe of your mesh interface lives in here
• skb — the multicast packet to transmit 📦 the actual lil package that needs to get sent out
• vid — the vlan identifier 🏷️ yes, that vlan

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💖 DESCRIPTION 💖

so this function sends copies of a frame with a multicast destination to any node that has the BATADV_MCAST_WANT_ALL_IPV4 flag set or the BATADV_MCAST_WANT_ALL_IPV6 flag set. any node. all of them. it's giving "you get a packet, you get a packet" energy 👑

and the way it does it? for each one of those destination nodes, a transmission is performed via a batman-adv unicast packet. the way that it's unicast on the wire but multicast in spirit… iconic 😭🔥

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⭐ RETURN ⭐

• NET_XMIT_DROP — if memory allocation fails 😭 or if the protocol family is neither IPv4 nor IPv6 (like… pick a lane bestie 💀)
• NET_XMIT_SUCCESS — otherwise 🌈 slay

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💜 SEE ALSO 💜

the kernel file ./net/batman-adv/multicast.c, plus honestly the entire multicast friend group 🫶 here's the full roster, no cap, every single one:

• 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_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_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)

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💀 real talk: iykyk, but also — memory allocation failure returns NET_XMIT_DROP, and so does a protocol family that isn't IPv4 or IPv6. no guessing, that's straight from the source.

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okay bye bestie, go read your packets 📚💅

sign-off check 🎀 this one came from ./net/batman-adv, dated October 2026, and it's page batadv_mcast_forw_want_all(9) of the Kernel API Manual. mwah 💋✨