2 * netifd - network interface daemon
3 * Copyright (C) 2012 Felix Fietkau <nbd@openwrt.org>
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License version 2
7 * as published by the Free Software Foundation
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
20 #include "interface.h"
22 static struct avl_tree aliases;
27 struct device_user dep;
28 struct device_user new_dep;
33 static struct device_type alias_device_type;
35 static void alias_set_device(struct alias_device *alias, struct device *dev)
37 if (dev == alias->dep.dev) {
39 device_remove_user(&alias->new_dep);
40 alias->update = false;
42 device_set_present(&alias->dev, true);
47 device_set_present(&alias->dev, false);
48 device_remove_user(&alias->new_dep);
49 if (alias->dev.active) {
51 device_add_user(&alias->new_dep, dev);
57 alias->update = false;
58 device_remove_user(&alias->dep);
59 alias->dev.hidden = !dev;
61 device_set_ifindex(&alias->dev, dev->ifindex);
62 device_set_ifname(&alias->dev, dev->ifname);
63 device_add_user(&alias->dep, dev);
65 device_set_ifname(&alias->dev, "");
66 device_set_link(&alias->dev, false);
71 alias_device_set_state(struct device *dev, bool state)
73 struct alias_device *alias;
75 alias = container_of(dev, struct alias_device, dev);
80 return device_claim(&alias->dep);
82 device_release(&alias->dep);
84 alias_set_device(alias, alias->new_dep.dev);
89 static void alias_device_cb(struct device_user *dep, enum device_event ev)
91 struct alias_device *alias;
92 bool new_state = false;
94 alias = container_of(dep, struct alias_device, dep);
98 case DEV_EVENT_REMOVE:
99 device_set_present(&alias->dev, new_state);
101 case DEV_EVENT_LINK_UP:
103 case DEV_EVENT_LINK_DOWN:
104 device_set_link(&alias->dev, new_state);
106 case DEV_EVENT_UPDATE_IFINDEX:
107 device_set_ifindex(&alias->dev, dep->dev->ifindex);
110 device_broadcast_event(&alias->dev, ev);
115 static struct device *
116 alias_device_create(const char *name, struct device_type *devtype,
117 struct blob_attr *attr)
119 struct alias_device *alias;
121 alias = calloc(1, sizeof(*alias) + strlen(name) + 1);
125 strcpy(alias->name, name);
126 alias->dev.set_state = alias_device_set_state;
127 alias->dev.hidden = true;
128 device_init_virtual(&alias->dev, devtype, NULL);
129 alias->avl.key = alias->name;
130 avl_insert(&aliases, &alias->avl);
131 alias->dep.alias = true;
132 alias->dep.cb = alias_device_cb;
133 device_check_state(&alias->dev);
138 static void alias_device_free(struct device *dev)
140 struct alias_device *alias;
142 alias = container_of(dev, struct alias_device, dev);
143 device_remove_user(&alias->new_dep);
144 device_remove_user(&alias->dep);
145 avl_delete(&aliases, &alias->avl);
149 static int alias_check_state(struct device *dev)
151 struct alias_device *alias;
152 struct interface *iface;
153 struct device *ndev = NULL;
155 alias = container_of(dev, struct alias_device, dev);
157 iface = vlist_find(&interfaces, alias->name, iface, node);
158 if (iface && iface->state == IFS_UP)
159 ndev = iface->l3_dev.dev;
161 alias_set_device(alias, ndev);
166 static struct device_type alias_device_type = {
167 .name = "Network alias",
168 .create = alias_device_create,
169 .free = alias_device_free,
170 .check_state = alias_check_state,
174 alias_notify_device(const char *name, struct device *dev)
176 struct alias_device *alias;
180 alias = avl_find_element(&aliases, name, alias, avl);
182 alias_set_device(alias, dev);
188 device_alias_get(const char *name)
190 struct alias_device *alias;
192 alias = avl_find_element(&aliases, name, alias, avl);
196 return alias_device_create(name, &alias_device_type, NULL);
199 static void __init alias_init(void)
201 avl_init(&aliases, avl_strcmp, false, NULL);