batadv_interface_rx(9)

💅 batadv_interface_rx(9)

okay so bestie, buckle up — this one's from the Kernel API Manual and it's literally the function that catches ethernet frames coming in on your local batman-adv interface 🦋

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✨ NAME ✨

batadv_interface_rx — receive ethernet frame on local batman-adv interface 🎀

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✨ SYNOPSIS ✨

void batadv_interface_rx (struct net_device *mesh_iface , struct sk_buff
*skb , int hdr_size , struct batadv_orig_node *orig_node );

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🫶 ARGUMENTS 🫶

• mesh_iface — the local interface that's gonna receive the ethernet frame, iykyk 💖
• skb — the ethernet frame destined for mesh_iface 📦
• hdr_size — the size of the batman-adv header that's already been parsed 👑
• orig_node — the originator that sent the batman-adv packet, no cap ⭐

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🌸 DESCRIPTION 🌸

So what this does is send an ethernet frame to the receive path of the local mesh_iface — that's the whole vibe 💅

Now here's the part you cannot skip: skb->data must still point to the batman-adv header, with the size hdr_size. Not "should" — must. And the caller has to have already parsed this header itself, plus made sure that at least hdr_size bytes are still available for pull in skb. Like, that's on you, not on this function 🙈

fair warning bestie 😭 — the packet can still get dropped. That's just how it is.

It gets dropped when:

• the encapsulated ethernet frame is invalid, or
• it contains again a batman-adv packet (inception energy, we don't stan)

Also, unicast packets get dropped directly when they were sent between two isolated clients. no notes, that's the rule 💀

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🔥 SEE ALSO 🔥

Kernel file ./net/batman-adv/mesh-interface.c — and the whole friend group:

• batadv_skb_head_push(9)
• batadv_sum_counter(9)
• batadv_interface_stats(9)
• batadv_interface_set_mac_addr(9)
• batadv_interface_change_mtu(9)
• batadv_interface_set_rx_mode(9)
• batadv_interface_tx(9)
• batadv_meshif_vlan_release(9)
• batadv_meshif_vlan_get(9)
• batadv_meshif_create_vlan(9)
• batadv_meshif_destroy_vlan(9)
• batadv_interface_add_vid(9)
• batadv_interface_kill_vid(9)
• batadv_set_lockdep_class_one(9)
• batadv_set_lockdep_class(9)
• batadv_meshif_init_late(9)
• batadv_meshif_slave_add(9)
• batadv_meshif_slave_del(9)
• batadv_get_drvinfo(9)
• batadv_get_strings(9)
• batadv_get_ethtool_stats(9)
• batadv_get_sset_count(9)
• batadv_meshif_free(9)
• batadv_meshif_init_early(9)
• batadv_meshif_validate(9)
• batadv_meshif_newlink(9)
• batadv_meshif_destroy_netlink(9)
• batadv_meshif_is_valid(9)

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✨ that's the whole page, bestie ✨ it lives under ./net/batman-adv, dated October 2026, and the manual name up top is batadv_interface_rx(9). go forth and receive those frames 💜🦋🎀