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105 lines
3.4 KiB
C
105 lines
3.4 KiB
C
/*
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*
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* Wireless daemon for Linux
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*
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* Copyright (C) 2013-2019 Intel Corporation. All rights reserved.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*
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*/
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#ifndef __UTIL_H
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#define __UTIL_H
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#include <stdint.h>
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#include <unistd.h>
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#define align_len(len, boundary) (((len)+(boundary)-1) & ~((boundary)-1))
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#define MAC "%02x:%02x:%02x:%02x:%02x:%02x"
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#define MAC_STR(a) (a)[0], (a)[1], (a)[2], (a)[3], (a)[4], (a)[5]
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const char *util_ssid_to_utf8(size_t len, const uint8_t *ssid);
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bool util_ssid_is_utf8(size_t len, const uint8_t *ssid);
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bool util_ssid_is_hidden(size_t len, const uint8_t *ssid);
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const char *util_address_to_string(const uint8_t *addr);
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bool util_string_to_address(const char *str, uint8_t *addr);
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bool util_is_group_address(const uint8_t *addr);
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bool util_is_broadcast_address(const uint8_t *addr);
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bool util_is_valid_sta_address(const uint8_t *addr);
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const char *util_get_domain(const char *identity);
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const char *util_get_username(const char *identity);
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/*
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* Returns either true_value or false_value (depending if mask is 0xFF or 0x00
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* respectively).
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* This constant time selection method allows to keep an identical memory
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* access pattern.
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*/
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static inline uint8_t util_secure_select_byte(uint8_t mask,
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const uint8_t true_value,
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const uint8_t false_value)
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{
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return (mask & true_value) | (~mask & false_value);
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}
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/*
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* Copies either true_value or false_value (depending if mask is 0xFF or 0x00
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* respectively) into dest. All three buffers are assumed to be the same size.
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* This constant time selection method allows to keep an identical memory
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* access pattern.
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*/
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static inline void util_secure_select(uint8_t mask, const uint8_t *true_value,
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const uint8_t *false_value,
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uint8_t *dest, size_t size)
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{
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size_t i = 0;
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for (; i < size; i++)
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dest[i] = util_secure_select_byte(mask, true_value[i],
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false_value[i]);
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}
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/* Create a value filled with the MSB of the input. */
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static inline uint32_t util_secure_fill_with_msb(uint32_t val)
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{
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return (uint32_t) (val >> (sizeof(val)*8 - 1)) * 0xFFFFFFFF;
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}
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bool util_ip_prefix_tohl(const char *ip, uint8_t *prefix, uint32_t *start_out,
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uint32_t *end_out, uint32_t *mask_out);
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/* Host byte-order IPv4 netmask */
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static inline uint32_t util_netmask_from_prefix(uint8_t prefix_len)
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{
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return ~((1ull << (32 - prefix_len)) - 1);
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}
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/* Expects network byte-order (big-endian) addresses */
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static inline bool util_ip_subnet_match(uint8_t prefix_len,
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const void *addr1, const void *addr2)
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{
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const uint8_t *u8_1 = addr1;
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const uint8_t *u8_2 = addr2;
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uint8_t pref_bytes = prefix_len / 8;
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return (!pref_bytes || !memcmp(u8_1, u8_2, pref_bytes)) &&
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!((u8_1[pref_bytes] ^ u8_2[pref_bytes]) &
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~((1u << (8 - (prefix_len % 8))) - 1));
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}
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#endif /* __UTIL_H */
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