From 55944e5e40b1be2afc4855d8d2baf4b73d1876b5 Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Wed, 10 Apr 2024 22:49:52 +0200 Subject: Adding upstream version 255.4. Signed-off-by: Daniel Baumann --- src/libsystemd-network/ndisc-protocol.c | 34 +++++++++++++++++++++++++++++++++ 1 file changed, 34 insertions(+) create mode 100644 src/libsystemd-network/ndisc-protocol.c (limited to 'src/libsystemd-network/ndisc-protocol.c') diff --git a/src/libsystemd-network/ndisc-protocol.c b/src/libsystemd-network/ndisc-protocol.c new file mode 100644 index 0000000..fae4a58 --- /dev/null +++ b/src/libsystemd-network/ndisc-protocol.c @@ -0,0 +1,34 @@ +/* SPDX-License-Identifier: LGPL-2.1-or-later */ + +#include "ndisc-protocol.h" + +static const uint8_t prefix_length_code_to_prefix_length[_PREFIX_LENGTH_CODE_MAX] = { + [PREFIX_LENGTH_CODE_96] = 96, + [PREFIX_LENGTH_CODE_64] = 64, + [PREFIX_LENGTH_CODE_56] = 56, + [PREFIX_LENGTH_CODE_48] = 48, + [PREFIX_LENGTH_CODE_40] = 40, + [PREFIX_LENGTH_CODE_32] = 32, +}; + +int pref64_plc_to_prefix_length(uint16_t plc, uint8_t *ret) { + plc &= PREF64_PLC_MASK; + if (plc >= _PREFIX_LENGTH_CODE_MAX) + return -EINVAL; + + if (ret) + *ret = prefix_length_code_to_prefix_length[plc]; + return 0; +} + +int pref64_prefix_length_to_plc(uint8_t prefixlen, uint8_t *ret) { + assert(ret); + + for (size_t i = 0; i < ELEMENTSOF(prefix_length_code_to_prefix_length); i++) + if (prefix_length_code_to_prefix_length[i] == prefixlen) { + *ret = i; + return 0; + } + + return -EINVAL; +} -- cgit v1.2.3