calipso_map_cache_hash(9)

💅 calipso_map_cache_hash(9)

okay so first things first, the manual name is Kernel API Manual and this lil page lives in section 9 — yes, the big-brain kernel-functions section, iykyk 🧚

✨ NAME ✨

calipso_map_cache_hash — bestie, it's the hashing function for the CALIPSO cache 🔥

🌸 SYNOPSIS 🌸

u32 calipso_map_cache_hash (const unsigned char *key , u32 key_len );

🎀 ARGUMENTS 🎀

• key — the hash key itself, the actual thing we're gonna hash 💖
• key_len — how long that key is, measured in bytes 🦋

⭐ DESCRIPTION ⭐

so this is the CALIPSO tag hashing function, periodt. you hand it a key, it hands you back a 32-bit hash value. that's the whole vibe. no cap, that's literally it 💅

🌈 SEE ALSO 🌈

the kernel file is ./net/ipv6/calipso.c — go look, it's iconic:

calipso_cache_entry_free(9), calipso_cache_init(9), calipso_cache_invalidate(9), calipso_cache_check(9), calipso_cache_add(9), calipso_doi_search(9), calipso_doi_add(9), calipso_doi_free(9), calipso_doi_free_rcu(9), calipso_doi_remove(9), calipso_doi_getdef(9), calipso_doi_putdef(9), calipso_doi_walk(9), calipso_validate(9), calipso_map_cat_hton(9), calipso_map_cat_ntoh(9), calipso_pad_write(9), calipso_genopt(9), calipso_opt_update(9), calipso_tlv_len(9), calipso_opt_find(9), calipso_opt_insert(9), calipso_opt_del(9), calipso_opt_getattr(9), calipso_sock_getattr(9), calipso_sock_setattr(9), calipso_sock_delattr(9), calipso_req_setattr(9), calipso_req_delattr(9), calipso_skbuff_optptr(9), calipso_skbuff_setattr(9), calipso_skbuff_delattr(9), calipso_init(9)

like, the whole friend group, all linked up 🫶 go read them too, they ate 💀✨

and that's the page bestie!! 🍓 this one's from ./net/ipv6, dated October 2026, and it's still calipso_map_cache_hash(9) — main character energy from start to finish 👑💜