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.
21 static struct avl_tree aliases;
26 struct device_user dep;
31 static const struct device_type alias_device_type;
34 alias_device_set_state(struct device *dev, bool state)
36 struct alias_device *alias;
38 alias = container_of(dev, struct alias_device, dev);
43 return device_claim(&alias->dep);
45 device_release(&alias->dep);
47 device_remove_user(&alias->dep);
51 static void alias_device_cb(struct device_user *dep, enum device_event ev)
53 struct alias_device *alias;
56 alias = container_of(dep, struct alias_device, dep);
60 case DEV_EVENT_REMOVE:
61 device_set_present(&alias->dev, present);
64 device_broadcast_event(&alias->dev, ev);
69 static struct device *
70 alias_device_create(const char *name, struct blob_attr *attr)
72 struct alias_device *alias;
74 alias = calloc(1, sizeof(*alias) + strlen(name) + 1);
75 strcpy(alias->name, name);
76 alias->dev.set_state = alias_device_set_state;
77 alias->dev.hidden = true;
78 device_init_virtual(&alias->dev, &alias_device_type, NULL);
79 alias->avl.key = alias->name;
80 avl_insert(&aliases, &alias->avl);
81 alias->dep.alias = true;
82 alias->dep.cb = alias_device_cb;
87 static void alias_device_free(struct device *dev)
89 struct alias_device *alias;
91 alias = container_of(dev, struct alias_device, dev);
92 avl_delete(&aliases, &alias->avl);
96 static const struct device_type alias_device_type = {
97 .name = "Network alias",
98 .create = alias_device_create,
99 .free = alias_device_free,
103 alias_notify_device(const char *name, struct device *dev)
105 struct alias_device *alias;
109 alias = avl_find_element(&aliases, name, alias, avl);
113 alias->cleanup = !dev;
115 if (dev != alias->dep.dev) {
116 device_remove_user(&alias->dep);
117 strcpy(alias->dev.ifname, dev->ifname);
118 device_add_user(&alias->dep, dev);
119 alias->dev.hidden = false;
120 device_broadcast_event(&alias->dev, DEV_EVENT_UPDATE_IFNAME);
124 if (!dev && alias->dep.dev && !alias->dep.dev->active) {
125 device_remove_user(&alias->dep);
126 alias->dev.hidden = true;
127 alias->dev.ifname[0] = 0;
128 device_broadcast_event(&alias->dev, DEV_EVENT_UPDATE_IFNAME);
136 device_alias_get(const char *name)
138 struct alias_device *alias;
140 alias = avl_find_element(&aliases, name, alias, avl);
144 return alias_device_create(name, NULL);
147 static void __init alias_init(void)
149 avl_init(&aliases, avl_strcmp, false, NULL);