batadv_arp_get_type(9)

💖 NAME 💖

batadv_arp_get_type — bestie, this one parses an ARP packet and hands you back its type ✨

Oh and hiiii, quick vibe check before we dive in: this is batadv_arp_get_type(9), straight out of section 9 of the Kernel API Manual. She's a kernel function, she's lowkey iconic, let's get into it 🎀

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🌸 SYNOPSIS 🌸

u16 batadv_arp_get_type (struct batadv_priv *bat_priv , struct sk_buff *skb , int hdr_size );

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🦋 ARGUMENTS 🦋

• bat_priv — the bat priv, aka the main character that's holding all the mesh interface information 💅
• skb — the packet we're analysing, our little subject under the microscope 🔍
• hdr_size — the size of whatever header might be chilling in front of the ARP packet inside the skb 📏

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✨ DESCRIPTION ✨

⚠️ Warning, bestie, read this part twice: this function may reallocate the skb data buffer via pskb_may_pull/... (pskb_may_pull and friends, iykyk).

Okay so what that means is: any pointer into the skb data — like one you got from skb->data or from eth_hdr — that you were holding before this call? Consider it invalid the moment you come back. Gone. Expired. Not it. 😭 You have to reacquire it, no cap. Do not hold onto the old pointer and act like nothing happened, that's giving undefined-behaviour main character energy and we do not stan 💀

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👑 RETURN 👑

Returns the ARP type if the skb actually contains a valid ARP packet — and 0 otherwise 🫶

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🌈 SEE ALSO 🌈

Kernel file ./net/batman-adv/distributed-arp-table.c plus the whole squad:

• enum batadv_bootpop(9), enum batadv_boothtype(9), enum batadv_dhcpoptioncode(9), enum batadv_dhcptype(9)
• struct batadv_dhcp_packet(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_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)

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and that's the whole page, bestie!! go parse those ARP packets responsibly, reacquire your pointers, and remember: the data buffer might have moved. love u, bye 💜🧚‍♀️

mwah 💋 — sourced from ./net/batman-adv, dated October 2026, and yes that's the same batadv_arp_get_type(9) we've been screaming about this whole time 🍓