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IPv6 minirouting table entries hold persistent references to net devices.

This commit is contained in:
Michael Brown 2007-01-04 03:28:30 +00:00
parent b22d4405c0
commit b29861a5aa
2 changed files with 83 additions and 17 deletions
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5
src/include/gpxe/ip6.h
View File

@ -69,5 +69,10 @@ extern struct net_protocol ipv6_protocol;
extern struct tcpip_net_protocol ipv6_tcpip_protocol;
extern char * inet6_ntoa ( struct in6_addr in6 );
extern int add_ipv6_address ( struct net_device *netdev,
struct in6_addr prefix, int prefix_len,
struct in6_addr address,
struct in6_addr gateway );
extern void del_ipv6_address ( struct net_device *netdev );
#endif /* _GPXE_IP6_H */

95
src/net/ipv6.c
View File

@ -30,8 +30,12 @@ static struct in6_addr ip6_none = {
struct ipv6_miniroute {
/* List of miniroutes */
struct list_head list;
/* Network device */
struct net_device *netdev;
/** Reference to network device */
struct reference netdev_ref;
/* Destination prefix */
struct in6_addr prefix;
/* Prefix length */
@ -45,6 +49,71 @@ struct ipv6_miniroute {
/** List of IPv6 miniroutes */
static LIST_HEAD ( miniroutes );
static void ipv6_forget_netdev ( struct reference *ref );
/**
* Add IPv6 minirouting table entry
*
* @v netdev Network device
* @v prefix Destination prefix
* @v address Address of the interface
* @v gateway Gateway address (or ::0 for no gateway)
* @ret miniroute Routing table entry, or NULL
*/
static struct ipv6_miniroute * add_ipv6_miniroute ( struct net_device *netdev,
struct in6_addr prefix,
int prefix_len,
struct in6_addr address,
struct in6_addr gateway ) {
struct ipv6_miniroute *miniroute;
miniroute = malloc ( sizeof ( *miniroute ) );
if ( miniroute ) {
/* Record routing information */
miniroute->netdev = netdev;
miniroute->prefix = prefix;
miniroute->prefix_len = prefix_len;
miniroute->address = address;
miniroute->gateway = gateway;
/* Add miniroute to list of miniroutes */
if ( !IP6_EQUAL ( gateway, ip6_none ) ) {
list_add_tail ( &miniroute->list, &miniroutes );
} else {
list_add ( &miniroute->list, &miniroutes );
}
/* Record reference to net_device */
miniroute->netdev_ref.forget = ipv6_forget_netdev;
ref_add ( &miniroute->netdev_ref, &netdev->references );
}
return miniroute;
}
/**
* Delete IPv6 minirouting table entry
*
* @v miniroute Routing table entry
*/
static void del_ipv6_miniroute ( struct ipv6_miniroute *miniroute ) {
ref_del ( &miniroute->netdev_ref );
list_del ( &miniroute->list );
free ( miniroute );
}
/**
* Forget reference to net_device
*
* @v ref Persistent reference
*/
static void ipv6_forget_netdev ( struct reference *ref ) {
struct ipv6_miniroute *miniroute
= container_of ( ref, struct ipv6_miniroute, netdev_ref );
del_ipv6_miniroute ( miniroute );
}
/**
* Add IPv6 interface
*
@ -58,23 +127,15 @@ int add_ipv6_address ( struct net_device *netdev, struct in6_addr prefix,
struct in6_addr gateway ) {
struct ipv6_miniroute *miniroute;
miniroute = malloc ( sizeof ( *miniroute ) );
if ( !miniroute ) {
DBG ( "Not enough memory\n" );
return -ENOMEM;
}
miniroute->netdev = netdev;
miniroute->prefix = prefix;
miniroute->prefix_len = prefix_len;
miniroute->address = address;
miniroute->gateway = gateway;
/* Clear any existing address for this net device */
del_ipv6_address ( netdev );
/* Add new miniroute */
miniroute = add_ipv6_miniroute ( netdev, prefix, prefix_len, address,
gateway );
if ( ! miniroute )
return -ENOMEM;
/* Add miniroute to list of miniroutes */
if ( !IP6_EQUAL ( gateway, ip6_none ) ) {
list_add_tail ( &miniroute->list, &miniroutes );
} else {
list_add ( &miniroute->list, &miniroutes );
}
return 0;
}
@ -88,7 +149,7 @@ void del_ipv6_address ( struct net_device *netdev ) {
list_for_each_entry ( miniroute, &miniroutes, list ) {
if ( miniroute->netdev == netdev ) {
list_del ( &miniroute->list );
del_ipv6_miniroute ( miniroute );
break;
}
}