batadv_netlink_get_ifindex(9)

💖 batadv_netlink_get_ifindex(9) 💖

okay so real talk, this is a page out of the Kernel API Manual — the batadv_netlink_get_ifindex one, bestie. It lives in the batman-adv netlink corner of the kernel and it's genuinely so useful, iykyk. Let's get into it ✨

🌸 NAME 🌸

batadv_netlink_get_ifindex — literally just: pull an interface index out of a message 💅

✨ SYNOPSIS ✨

int batadv_netlink_get_ifindex (const struct nlmsghdr *nlh , int
       attrtype );

like, that's the whole signature, no notes 🔥

🎀 ARGUMENTS 🎀

• nlh — the message header. the main character of this function fr, this is the message you're digging through 🦋
• attrtype — the attribute that's holding the interface index. so like, which slot to look in 👑

⭐ RETURN ⭐

an interface index, or 0. that's it, that's the whole deal — if there's an index it gives it to you, and if not you get a 0. no cap 😭

🧚 SEE ALSO 🧚

the kernel file this lives in is ./net/batman-adv/netlink.c, and there's a whole lil squad of related things — honestly an iconic lineup, look at all these besties:

• enum batadv_netlink_multicast_groups(9)
• enum batadv_genl_ops_flags(9)
• batadv_netlink_mesh_fill_ap_isolation(9)
• batadv_netlink_set_mesh_ap_isolation(9)
• batadv_netlink_mesh_fill(9)
• batadv_netlink_notify_mesh(9)
• batadv_netlink_get_mesh(9)
• batadv_netlink_set_mesh(9)
• batadv_netlink_tp_meter_put(9)
• batadv_netlink_tpmeter_notify(9)
• batadv_netlink_tp_meter_start(9)
• batadv_netlink_tp_meter_cancel(9)
• batadv_netlink_hardif_fill(9)
• batadv_netlink_notify_hardif(9)
• batadv_netlink_cmd_get_hardif(9)
• batadv_netlink_set_hardif(9)
• batadv_netlink_dump_hardif(9)
• batadv_netlink_vlan_fill(9)
• batadv_netlink_notify_vlan(9)
• batadv_netlink_get_vlan(9)
• batadv_netlink_set_vlan(9)
• batadv_netlink_get_meshif_from_ifindex(9)
• batadv_netlink_get_meshif_from_info(9)
• batadv_netlink_get_meshif(9)
• batadv_netlink_get_hardif_from_ifindex(9)
• batadv_netlink_get_hardif_from_info(9)
• batadv_netlink_get_hardif(9)
• batadv_get_vlan_from_info(9)
• batadv_pre_doit(9)
• batadv_post_doit(9)
• batadv_netlink_register(9)
• batadv_netlink_unregister(9)

ok that's the whole page, you're officially caught up bestie 💜

and a lil sign-off for the credits: this one's from ./net/batman-adv, dated October 2026, and the page itself is batadv_netlink_get_ifindex(9). slay, go read the source 🫶🌸