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Minirouting table entries hold a persistent reference to a net_device.

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This commit is contained in:
Michael Brown 2007-01-04 03:10:21 +00:00
parent bdf79ec8dc
commit 35b5e5d3f5
1 changed files with 91 additions and 16 deletions
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107
src/net/ipv4.c
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@ -34,8 +34,12 @@ struct net_protocol ipv4_protocol;
struct ipv4_miniroute {
/** List of miniroutes */
struct list_head list;
/** Network device */
struct net_device *netdev;
/** Reference to network device */
struct reference netdev_ref;
/** IPv4 address */
struct in_addr address;
/** Subnet mask */
@ -50,6 +54,86 @@ static LIST_HEAD ( miniroutes );
/** List of fragment reassembly buffers */
static LIST_HEAD ( frag_buffers );
static void ipv4_forget_netdev ( struct reference *ref );
/**
* Add IPv4 minirouting table entry
*
* @v netdev Network device
* @v address IPv4 address
* @v netmask Subnet mask
* @v gateway Gateway address (or @c INADDR_NONE for no gateway)
* @ret miniroute Routing table entry, or NULL
*/
static struct ipv4_miniroute * add_ipv4_miniroute ( struct net_device *netdev,
struct in_addr address,
struct in_addr netmask,
struct in_addr gateway ) {
struct ipv4_miniroute *miniroute;
/* Allocate and populate miniroute structure */
miniroute = malloc ( sizeof ( *miniroute ) );
if ( miniroute ) {
DBG ( "IPv4 add %s", inet_ntoa ( address ) );
DBG ( "/%s ", inet_ntoa ( netmask ) );
if ( gateway.s_addr != INADDR_NONE )
DBG ( "gw %s ", inet_ntoa ( gateway ) );
DBG ( "via %s\n", netdev_name ( netdev ) );
/* Record routing information */
miniroute->netdev = netdev;
miniroute->address = address;
miniroute->netmask = netmask;
miniroute->gateway = gateway;
/* Add to end of list if we have a gateway, otherwise
* to start of list.
*/
if ( gateway.s_addr != INADDR_NONE ) {
list_add_tail ( &miniroute->list, &miniroutes );
} else {
list_add ( &miniroute->list, &miniroutes );
}
/* Record reference to net_device */
miniroute->netdev_ref.forget = ipv4_forget_netdev;
ref_add ( &miniroute->netdev_ref, &netdev->references );
}
return miniroute;
}
/**
* Delete IPv4 minirouting table entry
*
* @v miniroute Routing table entry
*/
static void del_ipv4_miniroute ( struct ipv4_miniroute *miniroute ) {
DBG ( "IPv4 del %s", inet_ntoa ( miniroute->address ) );
DBG ( "/%s ", inet_ntoa ( miniroute->netmask ) );
if ( miniroute->gateway.s_addr != INADDR_NONE )
DBG ( "gw %s ", inet_ntoa ( miniroute->gateway ) );
DBG ( "via %s\n", netdev_name ( miniroute->netdev ) );
ref_del ( &miniroute->netdev_ref );
list_del ( &miniroute->list );
free ( miniroute );
}
/**
* Forget reference to net_device
*
* @v ref Persistent reference
*/
static void ipv4_forget_netdev ( struct reference *ref ) {
struct ipv4_miniroute *miniroute
= container_of ( ref, struct ipv4_miniroute, netdev_ref );
del_ipv4_miniroute ( miniroute );
}
/**
* Add IPv4 interface
*
@ -64,23 +148,14 @@ int add_ipv4_address ( struct net_device *netdev, struct in_addr address,
struct in_addr netmask, struct in_addr gateway ) {
struct ipv4_miniroute *miniroute;
/* Allocate and populate miniroute structure */
miniroute = malloc ( sizeof ( *miniroute ) );
/* Clear any existing address for this net device */
del_ipv4_address ( netdev );
/* Add new miniroute */
miniroute = add_ipv4_miniroute ( netdev, address, netmask, gateway );
if ( ! miniroute )
return -ENOMEM;
miniroute->netdev = netdev;
miniroute->address = address;
miniroute->netmask = netmask;
miniroute->gateway = gateway;
/* Add to end of list if we have a gateway, otherwise to start
* of list.
*/
if ( gateway.s_addr != INADDR_NONE ) {
list_add_tail ( &miniroute->list, &miniroutes );
} else {
list_add ( &miniroute->list, &miniroutes );
}
return 0;
}
@ -94,7 +169,7 @@ void del_ipv4_address ( struct net_device *netdev ) {
list_for_each_entry ( miniroute, &miniroutes, list ) {
if ( miniroute->netdev == netdev ) {
list_del ( &miniroute->list );
del_ipv4_miniroute ( miniroute );
break;
}
}