STRUCT RMC_ENTRY(9)

✨ struct rmc_entry(9) ✨

okay so bestie, welcome to the Kernel API Manual page for struct rmc_entry — the literal main character of the Recent Multicast Cache 💅 she's an entry in the Recent Multicast Cache and she's serving struct, periodt.

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🌸 SYNOPSIS 🌸

struct rmc_entry {
    struct hlist_node list;
    unsigned long exp_time;
    u32 seqnum;
    u8 sa[ETH_ALEN];
 };

no cap, that's the whole vibe right there 🫶

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🎀 Members 🎀

• list — the hashtable list pointer, bestie. it's how she's hooked into the hashtable, iykyk 🔗
• exp_time — expiration time of the entry, measured in jiffies ⏰ (yes, jiffies, that's the unit, don't come for me)
• seqnum — the mesh sequence number of the frame 🔢
• sa — the source address of the frame 📬

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🦋 Description 🦋

so the Recent Multicast Cache literally keeps track of the latest multicast frames that have been received by a mesh interface, and then it discards received multicast frames that are found in the cache. that's the whole gig 💀 it's giving gatekeeper but make it helpful — sees a frame it already knows, and it's like "nope, already been there, bye" 🙈✨

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⭐ SEE ALSO ⭐

• Kernel file ./net/mac80211/mesh.h
• enum mesh_path_flags(9)
• enum mesh_deferred_task_flags(9)
• struct mesh_path(9)
• enum ieee80211_mesh_fast_tx_type(9)
• struct ieee80211_mesh_fast_tx_key(9)
• struct ieee80211_mesh_fast_tx(9)

all the besties in the same friend group, fr fr 👑

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okay that's the page!! go forth and cache responsibly 🧚💜

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and finally, the cute lil sign-off: this icon lives in ./net/mac80211, dated October 2026, and she's filed under struct rmc_entry(9) 🎀✨🌸