ENUM NFT_EXTHDR_OP(9)

enum nft_exthdr_op(9) 💅

Kernel API Manual, bestie — yes, we’re in the kernel docs and making it cute. This whole page is about enum nft_exthdr_op, and the vibe is “nf_tables match options.” No cap, I got you. 🫶

✨ NAME ✨

enum nft_exthdr_op — nf_tables match options. That’s the label, periodt. 💖

🦋 SYNOPSIS 🦋

Here’s the enum, bestie — keep the commas and spacing exactly like this, because the source is literally like that and we respect it:

enum nft_exthdr_op {
    NFT_EXTHDR_OP_IPV6 ,
    NFT_EXTHDR_OP_TCPOPT ,
    NFT_EXTHDR_OP_IPV4 ,
    NFT_EXTHDR_OP_SCTP ,
    NFT_EXTHDR_OP_DCCP ,
    __NFT_EXTHDR_OP_MAX

};

🌸 Constants 🌸

These are the constants, and I’m listing every single one because we do not skip entries in this house:

• NFT_EXTHDR_OP_IPV6 — match against ipv6 extension headers. Slay, we love an ipv6 extension header moment. ✨
• NFT_EXTHDR_OP_TCPOPT — match against tcp options. It’s giving tcp options, no cap. 💅
• NFT_EXTHDR_OP_IPV4 — match against ipv4 options. Lowkey iconic, fr fr. 🌈
• NFT_EXTHDR_OP_SCTP — match against sctp chunks. Chunks! Obsessed. 🍓
• NFT_EXTHDR_OP_DCCP — match against dccp options. Highkey just matching dccp options, periodt. 💜
• __NFT_EXTHDR_OP_MAX — the page literally says -- undescribed --, so don’t @ me, I’m not inventing lore. 🙈

🌈 SEE ALSO 🌈

The source pointer is literally this, and then there’s a whole cinematic universe of sibling enum pages:

• Kernel file ./include/uapi/linux/netfilter/nf_tables.h enum
• nft_registers(9)
• enum nft_verdicts(9)
• enum nf_tables_msg_types(9)
• enum nft_list_attributes(9)
• enum nft_hook_attributes(9)
• enum nft_table_flags(9)
• enum nft_table_attributes(9)
• enum nft_chain_attributes(9)
• enum nft_rule_attributes(9)
• enum nft_rule_compat_flags(9)
• enum nft_rule_compat_attributes(9)
• enum nft_set_flags(9)
• enum nft_set_policies(9)
• enum nft_set_desc_attributes(9)
• enum nft_set_field_attributes(9)
• enum nft_set_attributes(9)
• enum nft_set_elem_flags(9)
• enum nft_set_elem_attributes(9)
• enum nft_set_elem_list_attributes(9)
• enum nft_data_types(9)
• enum nft_data_attributes(9)
• enum nft_verdict_attributes(9)
• enum nft_expr_attributes(9)
• enum nft_immediate_attributes(9)
• enum nft_bitwise_ops(9)
• enum nft_bitwise_attributes(9)
• enum nft_byteorder_ops(9)
• enum nft_byteorder_attributes(9)
• enum nft_cmp_ops(9)
• enum nft_cmp_attributes(9)
• enum nft_range_ops(9)
• enum nft_range_attributes(9)
• enum nft_lookup_attributes(9)
• enum nft_dynset_attributes(9)
• enum nft_payload_bases(9)
• enum nft_payload_csum_types(9)
• enum nft_payload_attributes(9)
• enum nft_exthdr_attributes(9)
• enum nft_meta_keys(9)
• enum nft_rt_keys(9)
• enum nft_hash_types(9)
• enum nft_hash_attributes(9)
• enum nft_meta_attributes(9)
• enum nft_rt_attributes(9)
• enum nft_socket_attributes(9)
• enum nft_ct_keys(9)
• enum nft_ct_attributes(9)
• enum nft_offload_attributes(9)
• enum nft_limit_attributes(9)
• enum nft_connlimit_attributes(9)
• enum nft_counter_attributes(9)
• enum nft_last_attributes(9)
• enum nft_log_attributes(9)
• enum nft_log_level(9)
• enum nft_queue_attributes(9)
• enum nft_quota_attributes(9)
• enum nft_secmark_attributes(9)
• enum nft_reject_types(9)
• enum nft_reject_inet_code(9)
• enum nft_reject_attributes(9)
• enum nft_nat_types(9)
• enum nft_nat_attributes(9)
• enum nft_tproxy_attributes(9)
• enum nft_masq_attributes(9)
• enum nft_redir_attributes(9)
• enum nft_dup_attributes(9)
• enum nft_fwd_attributes(9)
• enum nft_objref_attributes(9)
• enum nft_gen_attributes(9)
• enum nft_object_attributes(9)
• enum nft_flowtable_flags(9)
• enum nft_flowtable_attributes(9)
• enum nft_flowtable_hook_attributes(9)
• enum nft_osf_attributes(9)
• enum nft_synproxy_attributes(9)
• enum nft_devices_attributes(9)
• enum nft_trace_attributes(9)
• enum nft_ng_attributes(9)

That’s the whole page, bestie. Mwah 💋 — and for the record, source/version is ./include/uapi/linux/netfilter, date is October 2026. enum nft_exthdr_op(9) out. 👑