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uml: improve checking and diagnostics of ethernet MACs

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Improve checking and diagnostics for broadcast and multicast Ethernet MAC
addresses, and distinguish between those cases in output; also make sure the
device is assigned a MAC address valid only locally to avoid collisions.

Signed-off-by: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>
Signed-off-by: Jeff Dike <jdike@linux.intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Paolo 'Blaisorblade' Giarrusso 2007-05-06 14:51:13 -07:00 committed by Linus Torvalds
parent 85ee2ce8ae
commit e024715f5f
2 changed files with 41 additions and 9 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

38
arch/um/drivers/net_kern.c
View File

@ -283,7 +283,7 @@ void uml_net_user_timer_expire(unsigned long _conn)
#endif
}
static void setup_etheraddr(char *str, unsigned char *addr)
static void setup_etheraddr(char *str, unsigned char *addr, char *name)
{
char *end;
int i;
@ -302,15 +302,32 @@ static void setup_etheraddr(char *str, unsigned char *addr)
}
str = end + 1;
}
if(addr[0] & 1){
if (is_multicast_ether_addr(addr)) {
printk(KERN_ERR
"Attempt to assign a broadcast ethernet address to a "
"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: attempt to assign a globally valid ethernet address to a "
"device\n");
printk(KERN_WARNING "You should better enable the 2nd rightmost bit "
"in the first byte of the MAC, i.e. "
"%02x:%02x:%02x:%02x:%02x:%02x\n",
addr[0] | 0x02, addr[1], addr[2], addr[3], addr[4], addr[5]);
}
return;
random:
printk(KERN_INFO
"Choosing a random ethernet address for device %s\n", name);
random_ether_addr(addr);
}
@ -331,6 +348,7 @@ static void eth_configure(int n, void *init, char *mac,
struct net_device *dev;
struct uml_net_private *lp;
int save, err, size;
char name[sizeof(dev->name)];
size = transport->private_size + sizeof(struct uml_net_private) +
sizeof(((struct uml_net_private *) 0)->user);
@ -344,7 +362,13 @@ static void eth_configure(int n, void *init, char *mac,
INIT_LIST_HEAD(&device->list);
device->index = n;
setup_etheraddr(mac, device->mac);
/* If this name ends up conflicting with an existing registered
* netdevice, that is OK, register_netdev{,ice}() will notice this
* and fail.
*/
snprintf(name, sizeof(name), "eth%d", n);
setup_etheraddr(mac, device->mac, name);
printk(KERN_INFO "Netdevice %d ", n);
printk("(%02x:%02x:%02x:%02x:%02x:%02x) ",
@ -375,11 +399,7 @@ static void eth_configure(int n, void *init, char *mac,
goto out_free_netdev;
SET_NETDEV_DEV(dev,&device->pdev.dev);
/* If this name ends up conflicting with an existing registered
* netdevice, that is OK, register_netdev{,ice}() will notice this
* and fail.
*/
snprintf(dev->name, sizeof(dev->name), "eth%d", n);
strcpy(dev->name, name);
device->dev = dev;
/*

12
include/linux/etherdevice.h
View File

@ -70,6 +70,18 @@ static inline int is_multicast_ether_addr(const u8 *addr)
return (0x01 & addr[0]);
}
/**
* is_local_ether_addr - Determine if the Ethernet address is locally-assigned
* one (IEEE 802).
* @addr: Pointer to a six-byte array containing the Ethernet address
*
* Return true if the address is a local address.
*/
static inline int is_local_ether_addr(const u8 *addr)
{
return (0x02 & addr[0]);
}
/**
* is_broadcast_ether_addr - Determine if the Ethernet address is broadcast
* @addr: Pointer to a six-byte array containing the Ethernet address