diff options
Diffstat (limited to 'lib/net_utils.c')
-rw-r--r-- | lib/net_utils.c | 29 |
1 files changed, 29 insertions, 0 deletions
diff --git a/lib/net_utils.c b/lib/net_utils.c new file mode 100644 index 0000000000..42bb0473fb --- /dev/null +++ b/lib/net_utils.c @@ -0,0 +1,29 @@ +// SPDX-License-Identifier: GPL-2.0 +#include <linux/string.h> +#include <linux/if_ether.h> +#include <linux/ctype.h> +#include <linux/export.h> +#include <linux/hex.h> + +bool mac_pton(const char *s, u8 *mac) +{ + size_t maxlen = 3 * ETH_ALEN - 1; + int i; + + /* XX:XX:XX:XX:XX:XX */ + if (strnlen(s, maxlen) < maxlen) + return false; + + /* Don't dirty result unless string is valid MAC. */ + for (i = 0; i < ETH_ALEN; i++) { + if (!isxdigit(s[i * 3]) || !isxdigit(s[i * 3 + 1])) + return false; + if (i != ETH_ALEN - 1 && s[i * 3 + 2] != ':') + return false; + } + for (i = 0; i < ETH_ALEN; i++) { + mac[i] = (hex_to_bin(s[i * 3]) << 4) | hex_to_bin(s[i * 3 + 1]); + } + return true; +} +EXPORT_SYMBOL(mac_pton); |