cipso_v4_parsetag_loc(9)

🌸 cipso_v4_parsetag_loc — it's in section 9 of the Kernel API Manual, bestie 🌸

Okay so picture this: you're deep in the kernel, someone hands you a CIPSO local tag, and you're like "what do I even do with this?" — that's literally this function's whole job. It's from the Kernel API Manual, section 9, and honestly it's giving "small function, big responsibility" energy 💅

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✨ NAME ✨

cipso_v4_parsetag_loc — okay so this one parses a CIPSO local tag. That's it. That's the whole name. Slay.

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🎀 SYNOPSIS 🎀

int cipso_v4_parsetag_loc (const struct cipso_v4_doi *doi_def , const
       unsigned char *tag , struct netlbl_lsm_secattr *secattr );

Three things in, one int out. Simple queen behavior 👑

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🦋 ARGUMENTS 🦋

• doi_def — the DOI definition. Like, the whole rulebook for this domain of interpretation. You need it, don't skip it 🙈
• tag — the CIPSO tag itself. The actual raw bytes we're about to read. Our main character, honestly.
• secattr — the security attributes. This is the output spot — where all the parsed goodness lands ✨

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💖 DESCRIPTION 💖

So the whole vibe is: parse a CIPSO local tag, and drop the resulting security attributes into secattr. That's it. That's the mission 🫶

Return values, no cap:

• returns zero on success — we love a zero-return win 🎉
• returns negative values on failure — not every tag is gonna make it, and that's okay 😭

Real talk: failure here means negative values, plural, so don't go assuming one specific error code, bestie. Just check the sign and move on 💀

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🌈 SEE ALSO 🌈

The kernel file we're living in: ./net/ipv4/cipso_ipv4.c. Everything below is family. Neighbors. The whole CIPSO friend group 👑

The cache crew (they keep things fresh, iconic of them):

• cipso_v4_cache_entry_free(9), cipso_v4_map_cache_hash(9), cipso_v4_cache_init(9), cipso_v4_cache_invalidate(9), cipso_v4_cache_check(9), cipso_v4_cache_add(9)

The DOI delegation (bureaucracy but make it cute):

• cipso_v4_doi_search(9), cipso_v4_doi_add(9), cipso_v4_doi_free(9), cipso_v4_doi_free_rcu(9), cipso_v4_doi_remove(9), cipso_v4_doi_getdef(9), cipso_v4_doi_putdef(9), cipso_v4_doi_walk(9)

The level mappers (they handle the levels, respectfully):

• cipso_v4_map_lvl_valid(9), cipso_v4_map_lvl_hton(9), cipso_v4_map_lvl_ntoh(9)

The category mappers — bitmap flavor 🍓:

• cipso_v4_map_cat_rbm_valid(9), cipso_v4_map_cat_rbm_hton(9), cipso_v4_map_cat_rbm_ntoh(9)

The category mappers — enumerated flavor ✨:

• cipso_v4_map_cat_enum_valid(9), cipso_v4_map_cat_enum_hton(9), cipso_v4_map_cat_enum_ntoh(9)

The category mappers — range flavor 🎀:

• cipso_v4_map_cat_rng_valid(9), cipso_v4_map_cat_rng_hton(9), cipso_v4_map_cat_rng_ntoh(9)

The tag generator/parser squad (this function's direct besties):

• cipso_v4_gentag_hdr(9), cipso_v4_gentag_rbm(9), cipso_v4_parsetag_rbm(9), cipso_v4_gentag_enum(9), cipso_v4_parsetag_enum(9), cipso_v4_gentag_rng(9), cipso_v4_parsetag_rng(9), cipso_v4_gentag_loc(9), cipso_v4_optptr(9)

The validation / error / option girlies:

• cipso_v4_validate(9), cipso_v4_error(9), cipso_v4_genopt(9), cipso_v4_delopt(9)

The socket & request attribute crew 🔥:

• cipso_v4_sock_setattr(9), cipso_v4_req_setattr(9), cipso_v4_sock_delattr(9), cipso_v4_req_delattr(9), cipso_v4_sock_getattr(9), cipso_v4_getattr(9)

The skbuff delegation (they carry the data, literally):

• cipso_v4_skbuff_setattr(9), cipso_v4_skbuff_delattr(9)

And the mother of them all 👑:

• cipso_v4_init(9)

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That's the whole page, bestie. Go parse some tags. 🧚💜

Sign-off time: this little gem lives in ./net/ipv4, and the page is dated October 2026 — so yeah, future girlie energy fr fr. Go off, and remember: zero means slay, negative means try again 😭🌸