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net: add mac_pton() for parsing MAC address

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mac_pton() parses MAC address in form XX:XX:XX:XX:XX:XX and only in that form.

mac_pton() doesn't dirty result until it's sure string representation is valid.

mac_pton() doesn't care about characters _after_ last octet,
it's up to caller to deal with it.

mac_pton() diverges from 0/-E return value convention.
Target usage:

	if (!mac_pton(str, whatever->mac))
		return -EINVAL;
	/* ->mac being u8 [ETH_ALEN] is filled at this point. */
	/* optionally check str[3 * ETH_ALEN - 1] for termination */

Use mac_pton() in pktgen and netconsole for start.

Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Alexey Dobriyan 2011-05-07 23:00:07 +00:00 • committed by David S. Miller
parent 99f823f98f
commit 4940fc889e
5 changed files with 38 additions and 86 deletions
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1
include/linux/if_ether.h
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@ -136,6 +136,7 @@ int eth_header_parse(const struct sk_buff *skb, unsigned char *haddr);
extern struct ctl_table ether_table[];
#endif
int mac_pton(const char *s, u8 *mac);
extern ssize_t sysfs_format_mac(char *buf, const unsigned char *addr, int len);
#endif