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1// SPDX-License-Identifier: GPL-2.02#include <linux/string.h>3#include <linux/if_ether.h>4#include <linux/ctype.h>5#include <linux/export.h>6#include <linux/hex.h>7 8bool mac_pton(const char *s, u8 *mac)9{10 size_t maxlen = 3 * ETH_ALEN - 1;11 int i;12 13 /* XX:XX:XX:XX:XX:XX */14 if (strnlen(s, maxlen) < maxlen)15 return false;16 17 /* Don't dirty result unless string is valid MAC. */18 for (i = 0; i < ETH_ALEN; i++) {19 if (!isxdigit(s[i * 3]) || !isxdigit(s[i * 3 + 1]))20 return false;21 if (i != ETH_ALEN - 1 && s[i * 3 + 2] != ':')22 return false;23 }24 for (i = 0; i < ETH_ALEN; i++) {25 mac[i] = (hex_to_bin(s[i * 3]) << 4) | hex_to_bin(s[i * 3 + 1]);26 }27 return true;28}29EXPORT_SYMBOL(mac_pton);30