calipso_opt_update(9)

💖 NAME 💖

okay so this is calipso_opt_update(9) from the Kernel API Manual, and the name is doing exactly what it says, bestie: calipso_opt_update — replaces socket's hop options with a new set ✨

🎀 SYNOPSIS 🎀

int calipso_opt_update (struct sock *sk , struct ipv6_opt_hdr *hop );

🌸 ARGUMENTS 🌸

• sk — the socket. literally the socket in question 💅
• hop — new hop options. the fresh hop-options set, no cap.

🦋 DESCRIPTION 🦋

okay so the actual tea: calipso_opt_update replaces sk's hop options with hop. that's the whole function, fr fr.

and yes — hop may be NULL to leave the socket with no hop options. so if you want the socket sitting there with zero hop options, NULL is your girl 🫶

🔥 SEE ALSO 🔥

Kernel file ./net/ipv6/calipso.c — plus the whole calipso bestie list, iykyk:

• calipso_cache_entry_free(9)
• calipso_map_cache_hash(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_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)

xoxo from the calipso_opt_update(9) page, sourced from ./net/ipv6, dated October 2026 🫶💖✨