genlmsg_multicast_netns(9)

💫 genlmsg_multicast_netns(9) 💫

okay bestie, this is a page from the Kernel API Manual and it's genuinely so good — it's all about flinging a netlink message out to one specific network namespace like the main character it is. no cap, it's giving "targeted delivery" energy. 🎀

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✨ NAME ✨

genlmsg_multicast_netns — multicast a netlink message to a specific netns 🦋

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🌸 SYNOPSIS 🌸

int genlmsg_multicast_netns (const struct genl_family *family , struct
net *net , struct sk_buff *skb , u32 portid , unsigned int group , gfp_t
flags );

like, that's the whole signature. six args. she's a little long but she ate 💅

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👑 ARGUMENTS 👑

• family — the generic netlink family 🌈 (your whole vibe, basically — which family of generic netlink we're repping)
• net — the net namespace ⭐ (yeah, this specific one, we're not doing a whole-network broadcast here)
• skb — netlink message as socket buffer 🍓 (the actual message, chillin' in an sk_buff)
• portid — own netlink portid to avoid sending to yourself 🙈 (literally the "don't text yourself" parameter, iconic)
• group — offset of multicast group in groups array 💜 (an offset, note — not a raw id, it's the offset into the groups array)
• flags — allocation flags ✨ (the usual gfp_t allocation flags situation)

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🔥 SEE ALSO 🔥

okay so there's a whole friend group here, and they're all in the kernel file ./include/net/genetlink.h — go say hi to all of them:

• 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(9)
• genlmsg_multicast_allns(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)

like, the way that list just keeps going 😭 but every single one of them is a baddie in ./include/net/genetlink.h, periodt. 💀

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💖 friendly reminder that this lives in ./include/net — that's the kernel source path, iykyk.

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and that's the page!! mwah 🫶 this one dropped October 2026 out of ./include/net, so go forth and multicast responsibly, bestie. 🧚‍♀️✨💜