30 lines
697 B
C
30 lines
697 B
C
// SPDX-License-Identifier: GPL-2.0
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#include <linux/string.h>
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#include <linux/if_ether.h>
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#include <linux/ctype.h>
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#include <linux/export.h>
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#include <linux/hex.h>
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bool mac_pton(const char *s, u8 *mac)
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{
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size_t maxlen = 3 * ETH_ALEN - 1;
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int i;
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/* XX:XX:XX:XX:XX:XX */
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if (strnlen(s, maxlen) < maxlen)
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return false;
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/* Don't dirty result unless string is valid MAC. */
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for (i = 0; i < ETH_ALEN; i++) {
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if (!isxdigit(s[i * 3]) || !isxdigit(s[i * 3 + 1]))
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return false;
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if (i != ETH_ALEN - 1 && s[i * 3 + 2] != ':')
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return false;
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}
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for (i = 0; i < ETH_ALEN; i++) {
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mac[i] = (hex_to_bin(s[i * 3]) << 4) | hex_to_bin(s[i * 3 + 1]);
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}
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return true;
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}
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EXPORT_SYMBOL(mac_pton);
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