dev_mc_add(9)

💖 dev_mc_add(9) — Kernel API Manual 💖

okay bestie, welcome to the multicast address corner of the kernel, this one's a little cutie from the 9 section of the manual, so grab your strawberry drink and let's go 🍓

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✨ NAME ✨

dev_mc_add — add a multicast address, that's literally the whole vibe 🎀

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🌸 SYNOPSIS 🌸

int dev_mc_add (struct net_device *dev , const unsigned char *addr );

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🦋 ARGUMENTS 🦋

• dev — the device, like the actual network device you're doing this to 👑
• addr — the address you want to add, that's it, that's the girl 💅

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⭐ DESCRIPTION ⭐

so what it does: it adds a multicast address to the device — iconic — OR, and this is the lowkey important part, if that address is already there, it just increases the reference count instead 🔥

no duplicating, no drama, just a lil refcount bump, periodt 🫶

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🌈 SEE ALSO 🌈

kernel file ./net/core/dev_addr_lists.c, plus the whole friend group, and yes there are a LOT of them, no cap:

• __hw_addr_sync_dev(9)
• __hw_addr_ref_sync_dev(9)
• __hw_addr_ref_unsync_dev(9)
• __hw_addr_unsync_dev(9)
• __hw_addr_list_snapshot(9)
• __hw_addr_list_reconcile(9)
• dev_addr_flush(9)
• dev_addr_init(9)
• dev_addr_add(9)
• dev_addr_del(9)
• dev_uc_add_excl(9)
• dev_uc_add(9)
• dev_uc_del(9)
• dev_uc_sync(9)
• dev_uc_sync_multiple(9)
• dev_uc_unsync(9)
• dev_uc_flush(9)
• dev_uc_init(9)
• dev_mc_add_excl(9)
• dev_mc_add_global(9)
• dev_mc_del(9)
• dev_mc_del_global(9)
• dev_mc_sync(9)
• dev_mc_sync_multiple(9)
• dev_mc_unsync(9)
• dev_mc_flush(9)
• dev_mc_init(9)
• netif_uc_promisc_update(9)
• __dev_set_rx_mode(9)
• netif_rx_mode_sync(9)

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and that's the whole page bestie, stan ./net/core, dated October 2026, page name dev_mc_add(9) — mwah, go add some multicast addresses responsibly 💜🧚