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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 "system.h"
struct vlan_device {
struct device dev;
struct device_user dep;
device_state_cb set_state;
int id;
};
static void free_vlan_if(struct device *iface)
{
struct vlan_device *vldev;
vldev = container_of(iface, struct vlan_device, dev);
device_remove_user(&vldev->dep);
device_cleanup(&vldev->dev);
free(vldev);
}
static int vlan_set_device_state(struct device *dev, bool up)
{
struct vlan_device *vldev;
int ret = 0;
vldev = container_of(dev, struct vlan_device, dev);
if (!up) {
vldev->set_state(dev, false);
system_vlan_del(dev);
device_release(&vldev->dep);
return 0;
}
ret = device_claim(&vldev->dep);
if (ret < 0)
return ret;
system_vlan_add(vldev->dep.dev, vldev->id);
ret = vldev->set_state(dev, true);
if (ret)
device_release(&vldev->dep);
return ret;
}
static void vlan_dev_set_name(struct vlan_device *vldev, struct device *dev)
{
vldev->dev.hidden = dev->hidden;
snprintf(vldev->dev.ifname, IFNAMSIZ, "%s.%d", dev->ifname, vldev->id);
}
static void vlan_dev_cb(struct device_user *dep, enum device_event ev)
{
struct vlan_device *vldev;
bool new_state = false;
vldev = container_of(dep, struct vlan_device, dep);
switch(ev) {
case DEV_EVENT_ADD:
new_state = true;
case DEV_EVENT_REMOVE:
device_set_present(&vldev->dev, new_state);
break;
case DEV_EVENT_LINK_UP:
new_state = true;
case DEV_EVENT_LINK_DOWN:
device_set_link(&vldev->dev, new_state);
break;
case DEV_EVENT_UPDATE_IFNAME:
vlan_dev_set_name(vldev, dep->dev);
device_broadcast_event(&vldev->dev, ev);
break;
case DEV_EVENT_TOPO_CHANGE:
/* Propagate topo changes */
device_broadcast_event(&vldev->dev, DEV_EVENT_TOPO_CHANGE);
break;
default:
break;
}
}
static struct device *get_vlan_device(struct device *dev, int id, bool create)
{
static const struct device_type vlan_type = {
.name = "VLAN",
.config_params = &device_attr_list,
.keep_link_status = true,
.free = free_vlan_if,
};
struct vlan_device *vldev;
struct device_user *dep;
/* look for an existing interface before creating a new one */
list_for_each_entry(dep, &dev->users.list, list.list) {
if (dep->cb != vlan_dev_cb)
continue;
vldev = container_of(dep, struct vlan_device, dep);
if (vldev->id != id)
continue;
return &vldev->dev;
}
if (!create)
return NULL;
D(DEVICE, "Create vlan device '%s.%d'\n", dev->ifname, id);
vldev = calloc(1, sizeof(*vldev));
vldev->id = id;
vlan_dev_set_name(vldev, dev);
device_init_virtual(&vldev->dev, &vlan_type, NULL);
vldev->dev.default_config = true;
vldev->set_state = vldev->dev.set_state;
vldev->dev.set_state = vlan_set_device_state;
vldev->dep.cb = vlan_dev_cb;
device_add_user(&vldev->dep, dev);
return &vldev->dev;
}
static char *split_vlan(char *s)
{
s = strchr(s, '.');
if (!s)
goto out;
*s = 0;
s++;
out:
return s;
}
struct device *get_vlan_device_chain(const char *ifname, bool create)
{
struct device *dev = NULL;
char *buf, *s, *next, *err = NULL;
int id;
buf = strdup(ifname);
if (!buf)
return NULL;
s = split_vlan(buf);
dev = device_get(buf, create);
if (!dev)
goto error;
do {
next = split_vlan(s);
id = strtoul(s, &err, 10);
if (err && *err)
goto error;
dev = get_vlan_device(dev, id, create);
if (!dev)
goto error;
s = next;
if (!s)
goto out;
} while (1);
error:
dev = NULL;
out:
free(buf);
return dev;
}
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