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#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#include <assert.h>
#include "netifd.h"
#include "system.h"
static struct avl_tree devices;
static void __init dev_init(void)
{
avl_init(&devices, avl_strcmp, false, NULL);
}
static void free_simple_device(struct device *dev)
{
cleanup_device(dev);
free(dev);
}
static void broadcast_device_event(struct device *dev, enum device_event ev)
{
struct device_user *dep, *tmp;
list_for_each_entry_safe(dep, tmp, &dev->users, list) {
if (!dep->cb)
continue;
dep->cb(dep, ev);
}
}
static int set_device_state(struct device *dev, bool state)
{
if (state)
system_if_up(dev);
else
system_if_down(dev);
return 0;
}
int claim_device(struct device *dev)
{
int ret;
DPRINTF("claim device %s, new refcount: %d\n", dev->ifname, dev->active + 1);
if (++dev->active != 1)
return 0;
broadcast_device_event(dev, DEV_EVENT_SETUP);
ret = dev->set_state(dev, true);
if (ret == 0)
broadcast_device_event(dev, DEV_EVENT_UP);
else
dev->active = 0;
return ret;
}
void release_device(struct device *dev)
{
dev->active--;
DPRINTF("release device %s, new refcount: %d\n", dev->ifname, dev->active);
assert(dev->active >= 0);
if (dev->active)
return;
broadcast_device_event(dev, DEV_EVENT_TEARDOWN);
dev->set_state(dev, false);
broadcast_device_event(dev, DEV_EVENT_DOWN);
}
int check_device_state(struct device *dev)
{
if (!dev->type->check_state)
return 0;
return dev->type->check_state(dev);
}
void init_virtual_device(struct device *dev, const struct device_type *type, const char *name)
{
assert(dev);
assert(type);
if (name)
strncpy(dev->ifname, name, IFNAMSIZ);
fprintf(stderr, "Initialize device '%s'\n", dev->ifname);
INIT_LIST_HEAD(&dev->users);
dev->type = type;
}
int init_device(struct device *dev, const struct device_type *type, const char *ifname)
{
int ret;
init_virtual_device(dev, type, ifname);
if (!dev->set_state)
dev->set_state = set_device_state;
dev->avl.key = dev->ifname;
ret = avl_insert(&devices, &dev->avl);
if (ret < 0)
return ret;
check_device_state(dev);
return 0;
}
struct device *get_device(const char *name, bool create)
{
static const struct device_type simple_type = {
.name = "Device",
.check_state = system_if_check,
.free = free_simple_device,
};
struct device *dev;
if (strchr(name, '.'))
return get_vlan_device_chain(name, create);
dev = avl_find_element(&devices, name, dev, avl);
if (dev)
return dev;
if (!create)
return NULL;
dev = calloc(1, sizeof(*dev));
init_device(dev, &simple_type, name);
return dev;
}
void cleanup_device(struct device *dev)
{
struct device_user *dep, *tmp;
fprintf(stderr, "Clean up device '%s'\n", dev->ifname);
list_for_each_entry_safe(dep, tmp, &dev->users, list) {
if (!dep->cb)
continue;
dep->cb(dep, DEV_EVENT_REMOVE);
}
if (dev->avl.key)
avl_delete(&devices, &dev->avl);
}
void set_device_present(struct device *dev, bool state)
{
if (dev->present == state)
return;
DPRINTF("Device '%s' %s present\n", dev->ifname, state ? "is now" : "is no longer" );
dev->present = state;
broadcast_device_event(dev, state ? DEV_EVENT_ADD : DEV_EVENT_REMOVE);
}
void add_device_user(struct device_user *dep, struct device *dev)
{
dep->dev = dev;
list_add(&dep->list, &dev->users);
if (dep->cb && dev->present) {
dep->cb(dep, DEV_EVENT_ADD);
if (dev->active)
dep->cb(dep, DEV_EVENT_UP);
}
}
void remove_device_user(struct device_user *dep)
{
struct device *dev = dep->dev;
list_del(&dep->list);
if (list_empty(&dev->users)) {
/* all references have gone away, remove this device */
free_device(dev);
}
dep->dev = NULL;
}
void
cleanup_devices(void)
{
struct device *dev, *tmp;
avl_for_each_element_safe(&devices, dev, avl, tmp) {
if (!list_empty(&dev->users))
continue;
free_device(dev);
}
}
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