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/*
* netifd - network interface daemon
* Copyright (C) 2012 Felix Fietkau <nbd@openwrt.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2
* as published by the Free Software Foundation
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#include "netifd.h"
#include "device.h"
#include "interface.h"
static struct avl_tree aliases;
struct alias_device {
struct avl_node avl;
struct device dev;
struct device_user dep;
struct device_user new_dep;
bool update;
char name[];
};
static void alias_set_device(struct alias_device *alias, struct device *dev)
{
if (dev == alias->dep.dev) {
if (alias->update) {
device_remove_user(&alias->new_dep);
alias->update = false;
if (dev)
device_set_present(&alias->dev, true);
}
return;
}
device_set_present(&alias->dev, false);
device_remove_user(&alias->new_dep);
if (alias->dev.active) {
if (dev)
device_add_user(&alias->new_dep, dev);
alias->update = true;
return;
}
alias->update = false;
device_remove_user(&alias->dep);
alias->dev.hidden = !dev;
if (dev) {
device_set_ifindex(&alias->dev, dev->ifindex);
device_set_ifname(&alias->dev, dev->ifname);
device_add_user(&alias->dep, dev);
} else {
device_set_ifname(&alias->dev, "");
device_set_link(&alias->dev, false);
}
}
static int
alias_device_set_state(struct device *dev, bool state)
{
struct alias_device *alias;
alias = container_of(dev, struct alias_device, dev);
if (!alias->dep.dev)
return -1;
if (state)
return device_claim(&alias->dep);
device_release(&alias->dep);
if (alias->update)
alias_set_device(alias, alias->new_dep.dev);
return 0;
}
static void alias_device_cb(struct device_user *dep, enum device_event ev)
{
struct alias_device *alias;
alias = container_of(dep, struct alias_device, dep);
switch (ev) {
case DEV_EVENT_ADD:
device_set_present(&alias->dev, true);
break;
case DEV_EVENT_REMOVE:
device_set_present(&alias->dev, false);
break;
case DEV_EVENT_LINK_UP:
device_set_link(&alias->dev, true);
break;
case DEV_EVENT_LINK_DOWN:
device_set_link(&alias->dev, false);
break;
case DEV_EVENT_UPDATE_IFINDEX:
device_set_ifindex(&alias->dev, dep->dev->ifindex);
break;
default:
device_broadcast_event(&alias->dev, ev);
break;
}
}
static struct device *
alias_device_create(const char *name, struct device_type *devtype,
struct blob_attr *attr)
{
struct alias_device *alias;
alias = calloc(1, sizeof(*alias) + strlen(name) + 1);
if (!alias)
return NULL;
strcpy(alias->name, name);
alias->dev.set_state = alias_device_set_state;
alias->dev.hidden = true;
if (device_init_virtual(&alias->dev, devtype, NULL) < 0) {
free(alias);
return NULL;
}
alias->avl.key = alias->name;
avl_insert(&aliases, &alias->avl);
alias->dep.alias = true;
alias->dep.cb = alias_device_cb;
device_check_state(&alias->dev);
return &alias->dev;
}
static void alias_device_free(struct device *dev)
{
struct alias_device *alias;
alias = container_of(dev, struct alias_device, dev);
device_remove_user(&alias->new_dep);
device_remove_user(&alias->dep);
avl_delete(&aliases, &alias->avl);
free(alias);
}
static int alias_check_state(struct device *dev)
{
struct alias_device *alias;
struct interface *iface;
struct device *ndev = NULL;
alias = container_of(dev, struct alias_device, dev);
iface = vlist_find(&interfaces, alias->name, iface, node);
if (iface && iface->state == IFS_UP)
ndev = iface->l3_dev.dev;
alias_set_device(alias, ndev);
return 0;
}
static struct device_type alias_device_type = {
.name = "Network alias",
.create = alias_device_create,
.free = alias_device_free,
.check_state = alias_check_state,
};
void
alias_notify_device(const char *name, struct device *dev)
{
struct alias_device *alias;
alias = avl_find_element(&aliases, name, alias, avl);
if (alias)
alias_set_device(alias, dev);
}
struct device *
device_alias_get(const char *name)
{
struct alias_device *alias;
alias = avl_find_element(&aliases, name, alias, avl);
if (alias)
return &alias->dev;
return alias_device_create(name, &alias_device_type, NULL);
}
static void __init alias_init(void)
{
avl_init(&aliases, avl_strcmp, false, NULL);
}
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