ENUM NFT_BITWISE_ATTRIBUTES(9)

💅 enum nft_bitwise_attributes(9) ✨

okay so you opened the Kernel API Manual page for enum nft_bitwise_attributes(9) — bestie you are in the right place, this is the netlink attribute enum for the nf_tables bitwise expression, and yes it's as cute as it sounds 🎀

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✨ NAME ✨

enum nft_bitwise_attributes — the nf_tables bitwise expression netlink attributes, fr fr 🦋

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🌸 SYNOPSIS 🌸

enum nft_bitwise_attributes {
    NFTA_BITWISE_UNSPEC ,
    NFTA_BITWISE_SREG ,
    NFTA_BITWISE_DREG ,
    NFTA_BITWISE_LEN ,
    NFTA_BITWISE_MASK ,
    NFTA_BITWISE_XOR ,
    NFTA_BITWISE_OP ,
    NFTA_BITWISE_DATA ,
    NFTA_BITWISE_SREG2 ,
    __NFTA_BITWISE_MAX

};

like, that's the whole squad right there 👑

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💜 Constants 💜

okay so here's every single member, no cap, not skipping a one:

• NFTA_BITWISE_UNSPEC — nope, no description given for this one, it's giving mystery 😭 (-- undescribed --)
• NFTA_BITWISE_SREG — the source register, and it's a NLA_U32: nft_registers 💅
• NFTA_BITWISE_DREG — the destination register, also NLA_U32: nft_registers ✨
• NFTA_BITWISE_LEN — the length of the operands, NLA_U32 🎀
• NFTA_BITWISE_MASK — the mask value, and it's NLA_NESTED: nft_data_attributes 🦋
• NFTA_BITWISE_XOR — the xor value, also NLA_NESTED: nft_data_attributes 🌸
• NFTA_BITWISE_OP — the type of operation, NLA_U32: nft_bitwise_ops 🔥
• NFTA_BITWISE_DATA — the argument for non-boolean operations, NLA_NESTED: nft_data_attributes ⭐
• NFTA_BITWISE_SREG2 — the second source register, NLA_U32: nft_registers (yes bestie there's a second one, main character energy) 👑
• __NFTA_BITWISE_MAX — also undescribed, it's the internal max sentinel vibe, -- undescribed -- 💀

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🌈 Description 🌈

so the bitwise expression supports boolean and shift operations — iconic range honestly. it implements the boolean operations by performing this exact operation:

dreg = (sreg & mask) ^ xor

and these are the mask and xor values for each one, keep them exactly as they are:

• NOT: mask = 1, xor = 1
• OR: mask = ~x, xor = x
• XOR: mask = 1, xor = x
• AND: mask = x, xor = 0

like, that's it, that's the whole trick and it slays 🫶

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🦋 SEE ALSO 🦋

the kernel file is ./include/uapi/linux/netfilter/nf_tables.h, and here's the entire friend group, nobody left behind 🧚:

• 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_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_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, go read nf_tables.h and be free 💖

mwah 💋 — this one's from ./include/uapi/linux/netfilter, dated October 2026, and it's the enum nft_bitwise_attributes(9) manual, signing off 🎀✨