genlmsg_multicast_allns(9)

💅 genlmsg_multicast_allns — the kernel API manual, bestie edition ✨

okay so this is genlmsg_multicast_allns(9) from the Kernel API Manual, and it's literally the glow-up your netlink message needs when it wants to be everywhere at once. sit down, we're doing this 🎀

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✨ NAME ✨

genlmsg_multicast_allns — multicast a netlink message to all net namespaces 🌈

like, not just your namespace. ALL of them. main character energy fr fr 👑

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🦋 SYNOPSIS 🦋

int genlmsg_multicast_allns (const struct genl_family *family , struct
sk_buff *skb , u32 portid , unsigned int group );

look at her. four args, one int return, absolutely serving 🫶

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💖 ARGUMENTS 💖

• family — the generic netlink family 💐 (your whole vibe, basically)
• skb — netlink message as socket buffer 📨 (the message itself, packaged and ready to go)
• portid — own netlink portid, so you don't send it to yourself 🙈 (no cap, nobody wants that awkward self-DM energy)
• group — offset of the multicast group in the groups array 🎯 (your specific destination within the family)

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⭐ DESCRIPTION ⭐

This function must hold the RTNL or rcu_read_lock.

okay so lowkey this is the important part bestie 😭 — before you call this function you MUST be holding the RTNL or rcu_read_lock. no exceptions, that's the vibe check and you will fail it if you skip it 💅

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👑 SEE ALSO 👑

the whole friend group 💜 — kernel file ./include/net/genetlink.h, plus:

• struct genl_multicast_group(9)
• struct genl_family(9)
• struct genl_info(9)
• struct genl_small_ops(9)
• struct genl_ops(9)
• struct genl_split_ops(9)
• struct genl_dumpit_info(9)
• genl_info_init_ntf(9)
• genlmsg_iput(9)
• genlmsg_nlhdr(9)
• genlmsg_parse_deprecated(9)
• genlmsg_parse(9)
• genl_dump_check_consistent(9)
• genlmsg_put_reply(9)
• genlmsg_end(9)
• genlmsg_cancel(9)
• genlmsg_multicast_netns_filtered(9)
• genlmsg_multicast_netns(9)
• genlmsg_multicast(9)
• genlmsg_unicast(9)
• genlmsg_reply(9)
• genlmsg_data(9)
• genlmsg_len(9)
• genlmsg_msg_size(9)
• genlmsg_total_size(9)
• genlmsg_new(9)
• genl_set_err(9)

that's a lot of besties but they all ate, no notes 🔥

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and that's the whole page, periodt 💅 this lil beauty lives in ./include/net, dated October 2026, and it's part of the Kernel API Manual — mwah, go multicast responsibly bestie 🍓✨