• source navigation  • diff markup  • identifier search  • freetext search  • 

Sources/netifd/alias.c

  1 /*
  2  * netifd - network interface daemon
  3  * Copyright (C) 2012 Felix Fietkau <nbd@openwrt.org>
  4  *
  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
  8  *
  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.
 13  */
 14 #include <string.h>
 15 #include <stdlib.h>
 16 #include <stdio.h>
 17 
 18 #include "netifd.h"
 19 #include "device.h"
 20 #include "interface.h"
 21 
 22 static struct avl_tree aliases;
 23 
 24 struct alias_device {
 25         struct avl_node avl;
 26         struct device dev;
 27         struct device_user dep;
 28         struct device_user new_dep;
 29         bool update;
 30         char name[];
 31 };
 32 
 33 static void alias_set_device(struct alias_device *alias, struct device *dev)
 34 {
 35         if (dev == alias->dep.dev) {
 36                 if (alias->update) {
 37                         device_remove_user(&alias->new_dep);
 38                         alias->update = false;
 39                         if (dev)
 40                                 device_set_present(&alias->dev, true);
 41                 }
 42                 return;
 43         }
 44 
 45         device_set_present(&alias->dev, false);
 46         device_remove_user(&alias->new_dep);
 47         if (alias->dev.active) {
 48                 if (dev)
 49                         device_add_user(&alias->new_dep, dev);
 50 
 51                 alias->update = true;
 52                 return;
 53         }
 54 
 55         alias->update = false;
 56         device_remove_user(&alias->dep);
 57         alias->dev.hidden = !dev;
 58         if (dev) {
 59                 device_set_ifindex(&alias->dev, dev->ifindex);
 60                 device_set_ifname(&alias->dev, dev->ifname);
 61                 device_add_user(&alias->dep, dev);
 62         } else {
 63                 device_set_ifname(&alias->dev, "");
 64                 device_set_link(&alias->dev, false);
 65         }
 66 }
 67 
 68 static int
 69 alias_device_set_state(struct device *dev, bool state)
 70 {
 71         struct alias_device *alias;
 72 
 73         alias = container_of(dev, struct alias_device, dev);
 74         if (!alias->dep.dev)
 75                 return -1;
 76 
 77         if (state)
 78                 return device_claim(&alias->dep);
 79 
 80         device_release(&alias->dep);
 81         if (alias->update)
 82                 alias_set_device(alias, alias->new_dep.dev);
 83 
 84         return 0;
 85 }
 86 
 87 static void alias_device_cb(struct device_user *dep, enum device_event ev)
 88 {
 89         struct alias_device *alias;
 90 
 91         alias = container_of(dep, struct alias_device, dep);
 92         switch (ev) {
 93         case DEV_EVENT_ADD:
 94                 device_set_present(&alias->dev, true);
 95                 break;
 96         case DEV_EVENT_REMOVE:
 97                 device_set_present(&alias->dev, false);
 98                 break;
 99         case DEV_EVENT_LINK_UP:
100                 device_set_link(&alias->dev, true);
101                 break;
102         case DEV_EVENT_LINK_DOWN:
103                 device_set_link(&alias->dev, false);
104                 break;
105         case DEV_EVENT_UPDATE_IFINDEX:
106                 device_set_ifindex(&alias->dev, dep->dev->ifindex);
107                 break;
108         default:
109                 device_broadcast_event(&alias->dev, ev);
110                 break;
111         }
112 }
113 
114 static struct device *
115 alias_device_create(const char *name, struct device_type *devtype,
116                     struct blob_attr *attr)
117 {
118         struct alias_device *alias;
119 
120         alias = calloc(1, sizeof(*alias) + strlen(name) + 1);
121         if (!alias)
122                 return NULL;
123 
124         strcpy(alias->name, name);
125         alias->dev.set_state = alias_device_set_state;
126         alias->dev.hidden = true;
127         if (device_init_virtual(&alias->dev, devtype, NULL) < 0) {
128                 free(alias);
129                 return NULL;
130         }
131 
132         alias->avl.key = alias->name;
133         avl_insert(&aliases, &alias->avl);
134         alias->dep.alias = true;
135         alias->dep.cb = alias_device_cb;
136         device_check_state(&alias->dev);
137 
138         return &alias->dev;
139 }
140 
141 static void alias_device_free(struct device *dev)
142 {
143         struct alias_device *alias;
144 
145         alias = container_of(dev, struct alias_device, dev);
146         device_remove_user(&alias->new_dep);
147         device_remove_user(&alias->dep);
148         avl_delete(&aliases, &alias->avl);
149         free(alias);
150 }
151 
152 static int alias_check_state(struct device *dev)
153 {
154         struct alias_device *alias;
155         struct interface *iface;
156         struct device *ndev = NULL;
157 
158         alias = container_of(dev, struct alias_device, dev);
159 
160         iface = vlist_find(&interfaces, alias->name, iface, node);
161         if (iface && iface->state == IFS_UP)
162                 ndev = iface->l3_dev.dev;
163 
164         alias_set_device(alias, ndev);
165 
166         return 0;
167 }
168 
169 static struct device_type alias_device_type = {
170         .name = "Network alias",
171         .create = alias_device_create,
172         .free = alias_device_free,
173         .check_state = alias_check_state,
174 };
175 
176 void
177 alias_notify_device(const char *name, struct device *dev)
178 {
179         struct alias_device *alias;
180 
181         device_lock();
182 
183         alias = avl_find_element(&aliases, name, alias, avl);
184         if (alias)
185                 alias_set_device(alias, dev);
186 
187         device_unlock();
188 }
189 
190 struct device *
191 device_alias_get(const char *name)
192 {
193         struct alias_device *alias;
194 
195         alias = avl_find_element(&aliases, name, alias, avl);
196         if (alias)
197                 return &alias->dev;
198 
199         return alias_device_create(name, &alias_device_type, NULL);
200 }
201 
202 static void __init alias_init(void)
203 {
204         avl_init(&aliases, avl_strcmp, false, NULL);
205 }
206 

This page was automatically generated by LXR 0.3.1.  •  OpenWrt