1 files changed, 109 insertions, 0 deletions
diff --git a/xen-2.4.16/common/network.c b/xen-2.4.16/common/network.c
new file mode 100644
index 0000000000..7fc7b99370
--- /dev/null
+++ b/xen-2.4.16/common/network.c
@@ -0,0 +1,109 @@
+/* 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>
+
+/* vif globals */
+int sys_vif_count;
+kmem_cache_t *net_vif_cache;
+
+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]);
+}
+
+
+/* 
+ * 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:
+    {
+        printk("received addrule request from guestos!\n");
+    }
+    break;
+
+    case NETWORK_OP_DELETERULE:
+    {
+        printk("received deleterule request from guestos!\n");
+    }
+    break;
+
+    default:
+        ret = -ENOSYS;
+    }
+
+    return ret;
+}
+
+void __init net_init (void)
+{
+    sys_vif_count = 0;
+    net_vif_cache = kmem_cache_create("net_vif_cache", sizeof(net_vif_t),
+                                      0, SLAB_HWCACHE_ALIGN, NULL, NULL);
+}