void uml_net_setup_etheraddr()

in drivers/net_kern.c [277:326]

• 47 lines of code
• 10 McCabe index (conditional complexity)

void uml_net_setup_etheraddr(struct net_device *dev, char *str)
{
	u8 addr[ETH_ALEN];
	char *end;
	int i;

	if (str == NULL)
		goto random;

	for (i = 0; i < 6; i++) {
		addr[i] = simple_strtoul(str, &end, 16);
		if ((end == str) ||
		   ((*end != ':') && (*end != ',') && (*end != '\0'))) {
			printk(KERN_ERR
			       "setup_etheraddr: failed to parse '%s' "
			       "as an ethernet address\n", str);
			goto random;
		}
		str = end + 1;
	}
	if (is_multicast_ether_addr(addr)) {
		printk(KERN_ERR
		       "Attempt to assign a multicast ethernet address to a "
		       "device disallowed\n");
		goto random;
	}
	if (!is_valid_ether_addr(addr)) {
		printk(KERN_ERR
		       "Attempt to assign an invalid ethernet address to a "
		       "device disallowed\n");
		goto random;
	}
	if (!is_local_ether_addr(addr)) {
		printk(KERN_WARNING
		       "Warning: Assigning a globally valid ethernet "
		       "address to a device\n");
		printk(KERN_WARNING "You should set the 2nd rightmost bit in "
		       "the first byte of the MAC,\n");
		printk(KERN_WARNING "i.e. %02x:%02x:%02x:%02x:%02x:%02x\n",
		       addr[0] | 0x02, addr[1], addr[2], addr[3], addr[4],
		       addr[5]);
	}
	eth_hw_addr_set(dev, addr);
	return;

random:
	printk(KERN_INFO
	       "Choosing a random ethernet address for device %s\n", dev->name);
	eth_hw_addr_random(dev);
}