net: add mac_pton() for parsing MAC address

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

View File

@ -429,8 +429,6 @@ static ssize_t store_remote_mac(struct netconsole_target *nt,
size_t count)
{
u8 remote_mac[ETH_ALEN];
char *p = (char *) buf;
int i;
if (nt->enabled) {
printk(KERN_ERR "netconsole: target (%s) is enabled, "
@ -439,23 +437,13 @@ static ssize_t store_remote_mac(struct netconsole_target *nt,
return -EINVAL;
}
for (i = 0; i < ETH_ALEN - 1; i++) {
remote_mac[i] = simple_strtoul(p, &p, 16);
if (*p != ':')
goto invalid;
p++;
}
remote_mac[ETH_ALEN - 1] = simple_strtoul(p, &p, 16);
if (*p && (*p != '\n'))
goto invalid;
if (!mac_pton(buf, remote_mac))
return -EINVAL;
if (buf[3 * ETH_ALEN - 1] && buf[3 * ETH_ALEN - 1] != '\n')
return -EINVAL;
memcpy(nt->np.remote_mac, remote_mac, ETH_ALEN);
return strnlen(buf, count);
invalid:
printk(KERN_ERR "netconsole: invalid input\n");
return -EINVAL;
}
/*