35 lines
1.0 KiB
C
35 lines
1.0 KiB
C
/* SPDX-License-Identifier: LGPL-2.1-or-later */
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#include "ndisc-protocol.h"
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static const uint8_t prefix_length_code_to_prefix_length[_PREFIX_LENGTH_CODE_MAX] = {
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[PREFIX_LENGTH_CODE_96] = 96,
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[PREFIX_LENGTH_CODE_64] = 64,
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[PREFIX_LENGTH_CODE_56] = 56,
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[PREFIX_LENGTH_CODE_48] = 48,
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[PREFIX_LENGTH_CODE_40] = 40,
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[PREFIX_LENGTH_CODE_32] = 32,
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};
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int pref64_plc_to_prefix_length(uint16_t plc, uint8_t *ret) {
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plc &= PREF64_PLC_MASK;
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if (plc >= _PREFIX_LENGTH_CODE_MAX)
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return -EINVAL;
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if (ret)
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*ret = prefix_length_code_to_prefix_length[plc];
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return 0;
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}
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int pref64_prefix_length_to_plc(uint8_t prefixlen, uint8_t *ret) {
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assert(ret);
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for (size_t i = 0; i < ELEMENTSOF(prefix_length_code_to_prefix_length); i++)
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if (prefix_length_code_to_prefix_length[i] == prefixlen) {
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*ret = i;
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return 0;
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}
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return -EINVAL;
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}
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