ndo_dflt_fdb_dump(9)

🦋 ndo_dflt_fdb_dump(9) — the Kernel API Manual page your bestie actually wants to read 🦋

okay so this is a page from the Kernel API Manual, and it's about ndo_dflt_fdb_dump, which lowkey has the most main-character name ever. it's the default netdevice operation to dump an FDB table. iykyk. 💅

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✨ NAME ✨

ndo_dflt_fdb_dump — the default netdevice operation that dumps an FDB table. that's it, that's the vibe. 🎀

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🌸 SYNOPSIS 🌸

int ndo_dflt_fdb_dump (struct sk_buff *skb , struct netlink_callback *cb
, struct net_device *dev , struct net_device *filter_dev , int *idx );

look at all those params bestie, we're gonna go through every single one, no skipping, periodt. 💖

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💜 ARGUMENTS 💜

• skb — the socket buffer where the message gets stored. it's the little basket we're putting stuff into. 🧺
• cb — the netlink callback. yes queen, do your thing. ✨
• dev — the netdevice. the star of the show, the main character. 👑
• filter_dev — ignored. not me ignoring it, the code ignores it. it's literally just there vibing. 🙈
• idx — the number of FDB table entries that got dumped gets added to *idx. it's a pointer, so we're updating the thing it points to. note it's *idx, not idx, bestie, the asterisk is doing important work. ⭐

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🫶 DESCRIPTION 🫶

so what does this actually do? it's the default netdevice operation for dumping the existing unicast address list. slay. 🌈

and it returns the number of addresses from the list that got put in skb — so the return value is literally a count of how many addresses made it into the socket buffer. iconic behavior honestly. 🔥

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💀 SEE ALSO 💀

• Kernel file ./net/core/rtnetlink.c
• rtnl_nets_add(9)
• rtnl_unregister(9)
• rtnl_unregister_all(9)
• __rtnl_register_many(9)
• rtnl_link_register(9)
• rtnl_link_unregister(9)
• rtnl_af_register(9)
• rtnl_af_unregister(9)
• rtnl_get_net_ns_capable(9)

that's the whole friend group right there. go say hi. 🦋

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ngl this page is short but it ate. every argument accounted for, nothing left out, we stay thorough. 💅

and that's a wrap bestie!! this page lives in ./net/core and the date on it is October 2026 — so mark your calendar, screenshot it, put it on your fridge, the whole thing. 🎀💖✨ see u in the next manpage, mwah 🫶