STRUCT BATADV_DHCP_PACKET(9)

💅 struct batadv_dhcp_packet — a Kernel API Manual moment (manual: struct batadv_dhcp_packet(9))

okay so bestie, listen — this is the struct batadv_dhcp_packet, and it's literally the BOOTP/DHCP packet header. That's the NAME, that's the whole vibe. It's the shape your bytes have to be in when you're talking DHCP out here in batman-adv land. 🎀

✨ SYNOPSIS ✨

Like, here's the whole layout, every single field, no shortcuts:

struct batadv_dhcp_packet {
    __u8 op;
    __u8 htype;
    __u8 hlen;
    __u8 hops;
    __be32 xid;
    __be16 secs;
    __be16 flags;
    __be32 ciaddr;
    __be32 yiaddr;
    __be32 siaddr;
    __be32 giaddr;
    __u8 chaddr[16];
    __u8 sname[64];
    __u8 file[128];
    __be32 magic;
 };

🦋 Members (aka the whole cast, and yes they all ate) 🦋

• op — the message op code / message type. It's giving "what kind of packet is this".
• htype — hardware address type. what flavour of hardware addr are we dealing with.
• hlen — hardware address length. how long that hardware addr actually is.
• hops — number of relay hops.
• xid — transaction identifier. the little tag that ties a convo together.
• secs — seconds elapsed since the client started trying to boot. the "how long have you been standing there" counter.
• flags — BOOTP/DHCP flags.
• ciaddr — client IP address.
• yiaddr — "your" (client) IP address as assigned by the server. yes the quotes are canon, that's literally the field's whole personality.
• siaddr — IP address of next server to use in bootstrap.
• giaddr — relay agent IP address.
• chaddr — client hardware address.
• sname — optional server host name.
• file — boot file name.
• magic — BOOTP/DHCP magic cookie identifying the start of options. the little "options start HERE" signal, iconic behavior honestly 🔥

🌈 SEE ALSO 🌈

Kernel file ./net/batman-adv/distributed-arp-table.c and, like, an entire friend group of symbols — all of them, in order, no one left out:

• enum batadv_bootpop(9)
• enum batadv_boothtype(9)
• enum batadv_dhcpoptioncode(9)
• enum batadv_dhcptype(9)
• struct batadv_dhcp_header(9)
• struct batadv_dhcp_option_header(9)
• batadv_dat_start_timer(9)
• batadv_dat_entry_release(9)
• batadv_dat_entry_put(9)
• batadv_dat_to_purge(9)
• __batadv_dat_purge(9)
• batadv_dat_purge(9)
• batadv_compare_dat(9)
• batadv_arp_hw_src(9)
• batadv_arp_ip_src(9)
• batadv_arp_hw_dst(9)
• batadv_arp_ip_dst(9)
• batadv_hash_dat(9)
• batadv_dat_entry_hash_find(9)
• batadv_dat_entry_add(9)
• batadv_dbg_arp(9)
• batadv_is_orig_node_eligible(9)
• batadv_choose_next_candidate(9)
• batadv_dat_select_candidates(9)
• batadv_dat_forward_data(9)
• batadv_dat_tvlv_container_update(9)
• batadv_dat_status_update(9)
• batadv_dat_tvlv_ogm_handler_v1(9)
• batadv_dat_hash_free(9)
• batadv_dat_init(9)
• batadv_dat_free(9)
• batadv_dat_cache_dump_entry(9)
• batadv_dat_cache_dump_bucket(9)
• batadv_dat_cache_dump(9)
• batadv_arp_get_type(9)
• batadv_dat_get_vid(9)
• batadv_dat_arp_create_reply(9)
• batadv_dat_snoop_outgoing_arp_request(9)
• batadv_dat_snoop_incoming_arp_request(9)
• batadv_dat_snoop_outgoing_arp_reply(9)
• batadv_dat_snoop_incoming_arp_reply(9)
• batadv_dat_check_dhcp_ipudp(9)
• batadv_dat_check_dhcp(9)
• batadv_dat_get_dhcp_message_type(9)
• batadv_dat_dhcp_get_yiaddr(9)
• batadv_dat_get_dhcp_chaddr(9)
• batadv_dat_put_dhcp(9)
• batadv_dat_check_dhcp_ack(9)
• batadv_dat_snoop_outgoing_dhcp_ack(9)
• batadv_dat_snoop_incoming_dhcp_ack(9)
• batadv_dat_drop_broadcast_packet(9)

quick vibe check: every field name, every type, every one of those (9) references above is straight-up load-bearing. don't be out here editing the struct in your head, bestie — copy it fr fr. 💀

and that's the page! 🫶 brought to you by ./net/batman-adv, dated October 2026 — go off, kernel docs, you ate ⭐👑💜