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// Copyright 2024 The gVisor Authors.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package linux
// This file contains constants required to support nf_tables.
// 16-byte Registers that can be used to maintain state for rules.
// These correspond to values in include/uapi/linux/netfilter/nf_tables.h.
const (
NFT_REG_VERDICT = iota
NFT_REG_1
NFT_REG_2
NFT_REG_3
NFT_REG_4
__NFT_REG_MAX
)
// 4-byte Registers that can be used to maintain state for rules.
// Note that these overlap with the 16-byte registers in memory.
// These correspond to values in include/uapi/linux/netfilter/nf_tables.h.
const (
NFT_REG32_00 = 8 + iota
NFT_REG32_01
NFT_REG32_02
NFT_REG32_03
NFT_REG32_04
NFT_REG32_05
NFT_REG32_06
NFT_REG32_07
NFT_REG32_08
NFT_REG32_09
NFT_REG32_10
NFT_REG32_11
NFT_REG32_12
NFT_REG32_13
NFT_REG32_14
NFT_REG32_15
)
// Other register constants, corresponding to values in
// include/uapi/linux/netfilter/nf_tables.h.
const (
NFT_REG_MAX = __NFT_REG_MAX - 1 // Maximum register value
NFT_REG_SIZE = 16 // Size of NFT_REG
NFT_REG32_SIZE = 4 // Size of NFT_REG32
NFT_REG32_COUNT = NFT_REG32_15 - NFT_REG32_00 + 1 // Count of 4-byte registers
)
// Internal nf table verdicts. These are used for ruleset evaluation and
// are not returned to userspace.
//
// These also share their numeric name space with the netfilter verdicts. When
// used these values are converted to uint32 (purposefully overflowing the int).
// These correspond to values in include/uapi/linux/netfilter/nf_tables.h.
const (
// Continue evaluation of the current rule.
NFT_CONTINUE int32 = -1
// Terminate evaluation of the current rule.
NFT_BREAK = -2
// Push the current chain on the jump stack and jump to a chain.
NFT_JUMP = -3
// Jump to a chain without pushing the current chain on the jump stack.
NFT_GOTO = -4
// Return to the topmost chain on the jump stack.
NFT_RETURN = -5
)
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