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/* net_ring.c
*
* ring data structures for buffering messages between hypervisor and
* guestos's. As it stands this is only used for network buffer exchange.
*
*/
#include <hypervisor-ifs/network.h>
#include <xeno/sched.h>
#include <xeno/errno.h>
#include <xeno/init.h>
#include <xeno/slab.h>
#include <xeno/spinlock.h>
/* vif globals
* sys_vif_list is a lookup table for vifs, used in packet forwarding.
* it should be replaced later by something a little more flexible.
*/
int sys_vif_count;
net_vif_t *sys_vif_list[MAX_SYSTEM_VIFS];
net_rule_ent_t *net_rule_list;
kmem_cache_t *net_vif_cache;
kmem_cache_t *net_rule_cache;
static rwlock_t net_rule_lock = RW_LOCK_UNLOCKED;
net_ring_t *create_net_vif(int domain)
{
net_vif_t *new_vif;
net_ring_t *new_ring;
struct task_struct *dom_task;
if ( !(dom_task = find_domain_by_id(domain)) )
{
return NULL;
}
if ( (new_vif = kmem_cache_alloc(net_vif_cache, GFP_KERNEL)) == NULL )
{
return NULL;
}
dom_task->net_vif_list[dom_task->num_net_vifs] = new_vif;
new_ring = dom_task->net_ring_base + dom_task->num_net_vifs;
memset(new_ring, 0, sizeof(net_ring_t));
dom_task->net_vif_list[dom_task->num_net_vifs]->net_ring = new_ring;
skb_queue_head_init(
&dom_task->net_vif_list[dom_task->num_net_vifs]->skb_list);
dom_task->net_vif_list[dom_task->num_net_vifs]->id = sys_vif_count++;
dom_task->num_net_vifs++;
return new_ring;
}
/* delete the last vif in the given domain. There doesn't seem to be any reason
* (yet) to be able to axe an arbitrary vif, by vif id.
*/
void destroy_net_vif(struct task_struct *p)
{
struct sk_buff *skb;
int i;
if ( p->num_net_vifs <= 0 ) return; // nothing to do.
i = --p->num_net_vifs;
while ( (skb = skb_dequeue(&p->net_vif_list[i]->skb_list)) != NULL )
{
kfree_skb(skb);
}
kmem_cache_free(net_vif_cache, p->net_vif_list[i]);
}
int add_net_rule(net_rule_t *rule)
{
net_rule_ent_t *new_ent;
if ( (new_ent = kmem_cache_alloc(net_rule_cache, GFP_KERNEL)) == NULL )
{
return -ENOMEM;
}
memcpy(&new_ent->r, rule, sizeof(net_rule_t));
write_lock(&net_rule_lock);
new_ent->next = net_rule_list;
net_rule_list = new_ent;
write_unlock(&net_rule_lock);
return 0;
}
int delete_net_rule(net_rule_t *rule)
{
net_rule_ent_t *ent = net_rule_list, *prev = NULL;
while ( (ent) && (!(memcmp(rule, &ent->r, sizeof(net_rule_t)))) )
{
prev = ent;
ent = ent->next;
}
if (ent)
{
write_lock(&net_rule_lock);
if (prev)
{
prev->next = ent->next;
}
else
{
net_rule_list = ent->next;
}
kmem_cache_free(net_rule_cache, ent);
write_unlock(&net_rule_lock);
}
return 0;
}
void print_net_rule(net_rule_t *r)
{
printk("===] NET RULE:\n");
printk("=] src_addr : %lu\n", (unsigned long) r->src_addr);
printk("=] src_addr_mask : %lu\n", (unsigned long) r->src_addr_mask);
printk("=] dst_addr : %lu\n", (unsigned long) r->dst_addr);
printk("=] dst_addr_mask : %lu\n", (unsigned long) r->dst_addr_mask);
printk("=] src_port : %u\n", r->src_port);
printk("=] src_port_mask : %u\n", r->src_port_mask);
printk("=] dst_port : %u\n", r->dst_port);
printk("=] dst_port_mask : %u\n", r->dst_port_mask);
printk("=] dst_proto : %u\n", r->proto);
printk("=] src_interface : %u\n", r->src_interface);
printk("=] dst_interface : %u\n", r->dst_interface);
printk("=] action : %u\n", r->action);
}
void print_net_rule_list()
{
net_rule_ent_t *ent = net_rule_list;
int count = 0;
while (ent)
{
print_net_rule(&ent->r);
ent = ent->next;
count++;
}
printk("\nTotal of %d rules.\n", count);
}
/*
* This is the hook function to handle guest-invoked traps requesting
* changes to the network system.
*/
long do_network_op(network_op_t *u_network_op)
{
long ret=0;
network_op_t op;
if ( current->domain != 0 )
return -EPERM;
if ( copy_from_user(&op, u_network_op, sizeof(op)) )
return -EFAULT;
switch ( op.cmd )
{
case NETWORK_OP_ADDRULE:
{
add_net_rule(&op.u.net_rule);
}
break;
case NETWORK_OP_DELETERULE:
{
delete_net_rule(&op.u.net_rule);
}
break;
case NETWORK_OP_GETRULELIST:
{
// This should eventually ship a rule list up to the VM
// to be printed in its procfs. For now, we just print the rules.
print_net_rule_list();
}
break;
default:
ret = -ENOSYS;
}
return ret;
}
void __init net_init (void)
{
sys_vif_count = 0;
net_rule_list = NULL;
net_vif_cache = kmem_cache_create("net_vif_cache", sizeof(net_vif_t),
0, SLAB_HWCACHE_ALIGN, NULL, NULL);
net_rule_cache = kmem_cache_create("net_rule_cache", sizeof(net_rule_ent_t),
0, SLAB_HWCACHE_ALIGN, NULL, NULL);
}
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