ENUM NFT_CMP_ATTRIBUTES(9)

💖 enum nft_cmp_attributes(9) 💖

okay so bestie, this is a page straight out of the Kernel API Manual — it's enum nft_cmp_attributes(9), and it's lowkey the blueprint for the nf_tables cmp expression's netlink attributes. tiny enum, big main character energy. let's get into it 🫶

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✨ NAME ✨

enum nft_cmp_attributes — the nf_tables cmp expression netlink attributes. that's it, that's the whole vibe 🎀

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🌸 SYNOPSIS 🌸

enum nft_cmp_attributes {
    NFTA_CMP_UNSPEC ,
    NFTA_CMP_SREG ,
    NFTA_CMP_OP ,
    NFTA_CMP_DATA ,
    __NFTA_CMP_MAX

};

like, look at her. five members, zero notes. icon behavior 💅

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🦋 Constants 🦋

okay so here's the cast of characters, one by one, no skipping, we're doing all of them:

• NFTA_CMP_UNSPEC — -- undescribed -- 😭 the docs just did NOT show up for this one. it's giving mystery. it's giving "we don't talk about her". literally no description given, fr fr.
• NFTA_CMP_SREG — the source register of the data we're comparing. type check: NLA_U32: nft_registers. so it's a u32, and it's holding one of the nft_registers values. periodt ✨
• NFTA_CMP_OP — the cmp operation itself, like what comparison we're actually doing. type check: NLA_U32: nft_cmp_ops. slay, the actual op goes here.
• NFTA_CMP_DATA — the data to compare against. this is the thing on the other side of the comparison, bestie. type check: NLA_NESTED: nft_data_attributes — note that it's NESTED, so it's got its own little attribute family inside it 🪆
• __NFTA_CMP_MAX — -- undescribed -- 🙈 same situation as UNSPEC, no description in the docs. she's the internal max sentinel and honestly she's thriving in silence.

ngl, if you're looking for the NFTA_CMP_* values in the wild, they live in the kernel header. no cap, that's the source of truth 👑

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🌈 SEE ALSO 🌈

the whole friend group, and yes we're listing every single one because nobody gets left out 💜:

• 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_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_op(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)

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that's the whole page bestie, every last reference, we ate and left no crumbs 🍓

this lil beauty comes from ./include/uapi/linux/netfilter, dated October 2026, and it's page 9 of the Kernel API Manual ✨ mwah, go read the header file, ily, bye 💖🧚