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[netdevice] Add concept of a network device index

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IPv6 link-local socket addresses require some way to specify a local
network device.  We cannot simply use a pointer to the network device,
since a struct sockaddr_in6 may be long-lived and has no way to hold a
reference to the network device.

Using a network device index allows a socket address to cleanly refer
to a network device without worrying about whether or not that device
continues to exist.

Signed-off-by: Michael Brown <mcb30@ipxe.org>
This commit is contained in:
Michael Brown
2013-08-29 14:10:16 +01:00
parent c9ed9cb4e7
commit d5f69e9388
2 changed files with 5 additions and 2 deletions
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2
src/include/ipxe/netdevice.h
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@@ -300,6 +300,8 @@ struct net_device {
struct list_head list; struct list_head list;
/** List of open network devices */ /** List of open network devices */
struct list_head open_list; struct list_head open_list;
/** Index of this network device */
unsigned int index;
/** Name of this network device */ /** Name of this network device */
char name[12]; char name[12];
/** Underlying hardware device */ /** Underlying hardware device */

5
src/net/netdevice.c
View File

@@ -498,10 +498,11 @@ int register_netdev ( struct net_device *netdev ) {
uint32_t seed; uint32_t seed;
int rc; int rc;
/* Create device name */ /* Record device index and create device name */
netdev->index = ifindex++;
if ( netdev->name[0] == '\0' ) { if ( netdev->name[0] == '\0' ) {
snprintf ( netdev->name, sizeof ( netdev->name ), "net%d", snprintf ( netdev->name, sizeof ( netdev->name ), "net%d",
ifindex++ ); netdev->index );
} }
/* Set initial link-layer address, if not already set */ /* Set initial link-layer address, if not already set */