open_netns(9)

✨ open_netns(9) ✨

okay so real talk: this page is from the Kernel API Manual, and it’s all about switching into a network namespace by name. bestie, it’s giving portal-to-another-namespace energy 🌀✨

💖 NAME 💖

open_netns — switch to specified network namespace by name. literally the whole glow-up in one line 💅

🫶 SYNOPSIS 🫶

struct nstoken * open_netns (const char *name );

🌸 ARGUMENTS 🌸

• name — -- undescribed -- (yes, that’s the actual description on the page, no cap 🙈 the docs left this one on read)

🎀 DESCRIPTION 🎀

Returns a token with which to restore the original namespace using close_netns. so: you call open_netns, you get a token back, and later that token is what you hand to close_netns to restore the original namespace. iconic return-ticket behavior 🎟️✨

🦋 SEE ALSO 🦋

• Kernel file: ./tools/testing/selftests/bpf/network_helpers.h
• append_tid(9)
• csum_tcpudp_magic(9)
• csum_ipv6_magic(9)
• build_udp_v4_csum(9)
• build_udp_v6_csum(9)
• tc_prog_attach(9)

🍓 cute lil sign-off: source/version is ./tools/testing/selftests/bpf, date is October 2026, and the page is open_netns(9) — mwah 💋✨