rtnl_get_net_ns_capable(9)

💅 rtnl_get_net_ns_capable(9) 💅

okay bestie, so this is a page from the Kernel API Manual (yes, the actual kernel, not your group chat) and it's about rtnl_get_net_ns_capable — a lil function with a big job. it's short, it's sweet, and it literally gatekeeps network namespaces. let's get into it 🎀

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✨ NAME ✨

rtnl_get_net_ns_capable — get netns if sufficiently privileged.

like, it hands you the netns only if you're that girl (privileged enough). no permission? no namespace. periodt 👑

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🌸 SYNOPSIS 🌸

struct net * rtnl_get_net_ns_capable (struct sock *sk , int netnsid );

yep, that's the whole signature. two args in, a struct net * out. slay ✨

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🦋 ARGUMENTS 🦋

• sk — the netlink socket. this is your main character socket, the one going "hey, can i have that namespace please" 🥺
• netnsid — the network namespace identifier. it's literally the ID number of the netns you're asking about, iykyk 🔢

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💜 DESCRIPTION 💜

so what does it actually do? it returns the network namespace identified by netnsid on success 🎉 — that's it, that's the win.

and on failure? it returns an error pointer 😭 not NULL, not a vibey empty struct, an error pointer. so pls, check it properly before you go dereferencing, bestie. no cap, do the IS_ERR() check or it's giving undefined chaos 💀

that's genuinely the whole description. short and iconic. the function ate and left no crumbs 🫶

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🌈 SEE ALSO 🌈

what else is in the ./net/core/rtnetlink.c circle? the whole friend group fr fr:

• 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)
• ndo_dflt_fdb_dump(9)

go read those too, they're all living in the Kernel file ./net/core/rtnetlink.c 🧚‍♀️

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💖 cute lil sign-off: this page is brought to you by the ./net/core girlies, dated October 2026, straight out of the Kernel API Manual. mwah, go write some royal netlink code 👑💅