parse_tag_3_packet(9)

👑 parse_tag_3_packet 💅

okay so this is a page out of the Kernel API Manual (section 9, kernel-API girlies rise) and it's all about parse_tag_3_packet. buckle up bestie, it's a short one but it's lowkey important 🫶

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✨ NAME ✨

parse_tag_3_packet —

ngl the original NAME line is literally just the function name and a lonely little dash with absolutely nothing after it 😭 no cap, that's the whole name section. main character energy with no bio. iconic behavior honestly.

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🌸 SYNOPSIS 🌸

int parse_tag_3_packet (struct ecryptfs_crypt_stat *crypt_stat ,
unsigned char *data , struct list_head *auth_tok_list , struct
ecryptfs_auth_tok **new_auth_tok , size_t *packet_size , size_t
max_packet_size );

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🎀 ARGUMENTS 🎀

• crypt_stat — the cryptographic context that gets modified based on what's inside the packet. it's the vibe-setter fr.
• data — the raw bytes of the packet. literally just the bytes, bestie, no filter.
• auth_tok_list — so eCryptfs parses packets into authentication tokens, and a brand new auth token gets placed at the end of this list for this packet. queued up and ready 💅
• new_auth_tok — pointer to a pointer to memory that this function allocates. it sets the memory address of the pointer to NULL on error (so you're not left holding a mystery pointer 🫶). this object is added to the auth_tok_list.
• packet_size — this function writes the size of the parsed packet into this memory location. zero on error. so if you see a 0 there, something went sideways 😭
• max_packet_size — the maximum number of bytes to parse. the ceiling. the limit. the boundary-setting queen 💀

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🦋 DESCRIPTION 🦋

Returns zero on success; non-zero on error.

that's it. that's the whole description. zero = slay, non-zero = not slay 🙈

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🌈 SEE ALSO 🌈

kernel file ./fs/ecryptfs/keystore.c and honestly its whole friend group:

• ecryptfs_parse_packet_length(9)
• ecryptfs_write_packet_length(9)
• ecryptfs_verify_version(9)
• ecryptfs_verify_auth_tok_from_key(9)
• ecryptfs_find_auth_tok_for_sig(9)
• ecryptfs_parse_tag_70_packet(9)
• decrypt_pki_encrypted_session_key(9)
• parse_tag_1_packet(9)
• parse_tag_11_packet(9)
• decrypt_passphrase_encrypted_session_key(9)
• ecryptfs_parse_packet_set(9)
• write_tag_1_packet(9)
• write_tag_11_packet(9)
• write_tag_3_packet(9)
• ecryptfs_generate_key_packet_set(9)

like, the whole squad is here. iykyk 🧚

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mwah 💋 this lil page comes from ./fs/ecryptfs, dated October 2026, and it's forever known as parse_tag_3_packet(9). go forth and parse, bestie — you got this 🔥👑