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 void alias_set_device(struct alias_device *alias, struct device *dev)
35 if (dev == alias->dep.dev) {
37 device_remove_user(&alias->new_dep);
38 alias->update = false;
40 device_set_present(&alias->dev, true);
45 device_set_present(&alias->dev, false);
46 device_remove_user(&alias->new_dep);
47 if (alias->dev.active) {
49 device_add_user(&alias->new_dep, dev);
55 alias->update = false;
56 device_remove_user(&alias->dep);
57 alias->dev.hidden = !dev;
59 device_set_ifindex(&alias->dev, dev->ifindex);
60 device_set_ifname(&alias->dev, dev->ifname);
61 device_add_user(&alias->dep, dev);
63 device_set_ifname(&alias->dev, "");
64 device_set_link(&alias->dev, false);
69 alias_device_set_state(struct device *dev, bool state)
71 struct alias_device *alias;
73 alias = container_of(dev, struct alias_device, dev);
78 return device_claim(&alias->dep);
80 device_release(&alias->dep);
82 alias_set_device(alias, alias->new_dep.dev);
87 static void alias_device_cb(struct device_user *dep, enum device_event ev)
89 struct alias_device *alias;
90 bool new_state = false;
92 alias = container_of(dep, struct alias_device, dep);
96 case DEV_EVENT_REMOVE:
97 device_set_present(&alias->dev, new_state);
99 case DEV_EVENT_LINK_UP:
101 case DEV_EVENT_LINK_DOWN:
102 device_set_link(&alias->dev, new_state);
104 case DEV_EVENT_UPDATE_IFINDEX:
105 device_set_ifindex(&alias->dev, dep->dev->ifindex);
108 device_broadcast_event(&alias->dev, ev);
113 static struct device *
114 alias_device_create(const char *name, struct device_type *devtype,
115 struct blob_attr *attr)
117 struct alias_device *alias;
119 alias = calloc(1, sizeof(*alias) + strlen(name) + 1);
123 strcpy(alias->name, name);
124 alias->dev.set_state = alias_device_set_state;
125 alias->dev.hidden = true;
126 device_init_virtual(&alias->dev, devtype, NULL);
127 alias->avl.key = alias->name;
128 avl_insert(&aliases, &alias->avl);
129 alias->dep.alias = true;
130 alias->dep.cb = alias_device_cb;
131 device_check_state(&alias->dev);
136 static void alias_device_free(struct device *dev)
138 struct alias_device *alias;
140 alias = container_of(dev, struct alias_device, dev);
141 device_remove_user(&alias->new_dep);
142 device_remove_user(&alias->dep);
143 avl_delete(&aliases, &alias->avl);
147 static int alias_check_state(struct device *dev)
149 struct alias_device *alias;
150 struct interface *iface;
151 struct device *ndev = NULL;
153 alias = container_of(dev, struct alias_device, dev);
155 iface = vlist_find(&interfaces, alias->name, iface, node);
156 if (iface && iface->state == IFS_UP)
157 ndev = iface->l3_dev.dev;
159 alias_set_device(alias, ndev);
164 static struct device_type alias_device_type = {
165 .name = "Network alias",
166 .create = alias_device_create,
167 .free = alias_device_free,
168 .check_state = alias_check_state,
172 alias_notify_device(const char *name, struct device *dev)
174 struct alias_device *alias;
178 alias = avl_find_element(&aliases, name, alias, avl);
180 alias_set_device(alias, dev);
186 device_alias_get(const char *name)
188 struct alias_device *alias;
190 alias = avl_find_element(&aliases, name, alias, avl);
194 return alias_device_create(name, &alias_device_type, NULL);
197 static void __init alias_init(void)
199 avl_init(&aliases, avl_strcmp, false, NULL);