STRUCT BATADV_ICMP_HEADER(9)

💅 struct batadv_icmp_header(9) — the group-chat lore ✨

okay so bestie, welcome to the struct batadv_icmp_header(9) page in the Kernel API Manual 🫶 this is the lowkey MVP struct that every single ICMP packet in batman-adv shares its opening moves with. no cap, she's the blueprint 💖

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🌸 NAME 🌸

struct batadv_icmp_header — the members literally every ICMP packet has in common 👑 like the shared DNA of the whole ICMP family, fr fr

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✨ SYNOPSIS ✨

here's the whole glow-up, character for character, don't touch a thing 💅

struct batadv_icmp_header {
    __u8 packet_type;
    __u8 version;
    __u8 ttl;
    __u8 msg_type;
    __u8 dst[ETH_ALEN];
    __u8 orig[ETH_ALEN];
    __u8 uid;
    __u8 align[3];
 };

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🎀 Members 🎀

• packet_type — the batman-adv packet type, and she's part of the general header 👑 not a solo act
• version — batman-adv protocol version, also part of the general header ✨
• ttl — time to live for this packet, yep, part of the general header too 🦋
• msg_type — the ICMP packet type 💌
• dst — address of the destination node, where she's headed 🎯
• orig — address of the source node, where she came from 🌱
• uid — local ICMP socket identifier, like her little local ID badge 🙈
• align — not used, it's only there for alignment purposes, she's purely structural bestie 💀

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💜 Description 💜

so here's the tea 🍓 this structure is used for ICMP packet parsing only, and it is never sent over the wire. literally never, not even once, iykyk 🚫📡

the alignment field chilling at the end? she's there to make sure the members are padded the exact same way they are in real packets — so the vibes line up and the parsing goes off without a hitch ✨🧚

lowkey important: align is not data, she's just there so the padding matches. do NOT come for her, she's doing her job 🫶

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🔥 SEE ALSO 🔥

• Kernel file ./include/uapi/linux/batadv_packet.h 📁
• batadv_tp_is_error(9)
• enum batadv_packettype(9)
• enum batadv_subtype(9)
• enum batadv_iv_flags(9)
• enum batadv_icmp_packettype(9)
• enum batadv_mcast_flags(9)
• enum batadv_tt_data_flags(9)
• enum batadv_vlan_flags(9)
• enum batadv_bla_claimframe(9)
• enum batadv_tvlv_type(9)
• struct batadv_bla_claim_dst(9)
• struct batadv_ogm_packet(9)
• struct batadv_ogm2_packet(9)
• struct batadv_elp_packet(9)
• struct batadv_icmp_packet(9)
• struct batadv_icmp_tp_packet(9)
• enum batadv_icmp_tp_subtype(9)
• struct batadv_icmp_packet_rr(9)
• struct batadv_unicast_packet(9)
• struct batadv_unicast_4addr_packet(9)
• struct batadv_frag_packet(9)
• struct batadv_bcast_packet(9)
• struct batadv_mcast_packet(9)
• struct batadv_coded_packet(9)
• struct batadv_unicast_tvlv_packet(9)
• struct batadv_tvlv_hdr(9)
• struct batadv_tvlv_gateway_data(9)
• struct batadv_tvlv_tt_vlan_data(9)
• struct batadv_tvlv_tt_data(9)
• struct batadv_tvlv_tt_change(9)
• struct batadv_tvlv_roam_adv(9)
• struct batadv_tvlv_mcast_data(9)
• struct batadv_tvlv_mcast_tracker(9)

like, that's the whole friend group, go say hi 🌈💖

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and that's the page bestie!! 🎀 she lives in ./include/uapi/linux, dated October 2026, and she's giving main character energy in the Kernel API Manual 💅✨ mwah, go read some more manpages, ily 🫶