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 const 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)
40 device_remove_user(&alias->new_dep);
41 if (alias->dev.active) {
43 device_add_user(&alias->new_dep, dev);
49 alias->update = false;
50 device_remove_user(&alias->dep);
51 alias->dev.hidden = !dev;
53 strcpy(alias->dev.ifname, dev->ifname);
54 device_broadcast_event(&alias->dev, DEV_EVENT_UPDATE_IFNAME);
55 device_add_user(&alias->dep, dev);
57 alias->dev.ifname[0] = 0;
58 device_broadcast_event(&alias->dev, DEV_EVENT_UPDATE_IFNAME);
63 alias_device_set_state(struct device *dev, bool state)
65 struct alias_device *alias;
67 alias = container_of(dev, struct alias_device, dev);
72 return device_claim(&alias->dep);
74 device_release(&alias->dep);
76 alias_set_device(alias, alias->new_dep.dev);
81 static void alias_device_cb(struct device_user *dep, enum device_event ev)
83 struct alias_device *alias;
86 alias = container_of(dep, struct alias_device, dep);
90 case DEV_EVENT_REMOVE:
91 device_set_present(&alias->dev, present);
94 device_broadcast_event(&alias->dev, ev);
99 static struct device *
100 alias_device_create(const char *name, struct blob_attr *attr)
102 struct alias_device *alias;
104 alias = calloc(1, sizeof(*alias) + strlen(name) + 1);
105 strcpy(alias->name, name);
106 alias->dev.set_state = alias_device_set_state;
107 alias->dev.hidden = true;
108 device_init_virtual(&alias->dev, &alias_device_type, NULL);
109 alias->avl.key = alias->name;
110 avl_insert(&aliases, &alias->avl);
111 alias->dep.alias = true;
112 alias->dep.cb = alias_device_cb;
113 device_check_state(&alias->dev);
118 static void alias_device_free(struct device *dev)
120 struct alias_device *alias;
122 alias = container_of(dev, struct alias_device, dev);
123 avl_delete(&aliases, &alias->avl);
127 static int alias_check_state(struct device *dev)
129 struct alias_device *alias;
130 struct interface *iface;
131 struct device *ndev = NULL;
133 alias = container_of(dev, struct alias_device, dev);
135 iface = vlist_find(&interfaces, alias->name, iface, node);
136 if (iface && iface->state == IFS_UP)
137 ndev = iface->l3_dev.dev;
139 alias_set_device(alias, ndev);
144 static const struct device_type alias_device_type = {
145 .name = "Network alias",
146 .create = alias_device_create,
147 .free = alias_device_free,
148 .check_state = alias_check_state,
152 alias_notify_device(const char *name, struct device *dev)
154 struct alias_device *alias;
158 alias = avl_find_element(&aliases, name, alias, avl);
160 alias_set_device(alias, dev);
166 device_alias_get(const char *name)
168 struct alias_device *alias;
170 alias = avl_find_element(&aliases, name, alias, avl);
174 return alias_device_create(name, NULL);
177 static void __init alias_init(void)
179 avl_init(&aliases, avl_strcmp, false, NULL);