1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
|
/*
* netifd - network interface daemon
* Copyright (C) 2012 Felix Fietkau <nbd@openwrt.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2
* as published by the Free Software Foundation
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*/
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#include "netifd.h"
#include "device.h"
#include "interface.h"
static struct avl_tree aliases;
struct alias_device {
struct avl_node avl;
struct device dev;
struct device_user dep;
struct device_user new_dep;
bool update;
char name[];
};
static const struct device_type alias_device_type;
static void alias_set_device(struct alias_device *alias, struct device *dev)
{
if (dev == alias->dep.dev) {
if (alias->update) {
device_remove_user(&alias->new_dep);
alias->update = false;
if (dev)
device_set_present(&alias->dev, true);
}
return;
}
device_set_present(&alias->dev, false);
device_remove_user(&alias->new_dep);
if (alias->dev.active) {
if (dev)
device_add_user(&alias->new_dep, dev);
alias->update = true;
return;
}
alias->update = false;
device_remove_user(&alias->dep);
alias->dev.hidden = !dev;
if (dev) {
device_set_ifindex(&alias->dev, dev->ifindex);
strcpy(alias->dev.ifname, dev->ifname);
device_broadcast_event(&alias->dev, DEV_EVENT_UPDATE_IFNAME);
device_add_user(&alias->dep, dev);
} else {
alias->dev.ifname[0] = 0;
device_broadcast_event(&alias->dev, DEV_EVENT_UPDATE_IFNAME);
}
}
static int
alias_device_set_state(struct device *dev, bool state)
{
struct alias_device *alias;
alias = container_of(dev, struct alias_device, dev);
if (!alias->dep.dev)
return -1;
if (state)
return device_claim(&alias->dep);
device_release(&alias->dep);
if (alias->update)
alias_set_device(alias, alias->new_dep.dev);
return 0;
}
static void alias_device_cb(struct device_user *dep, enum device_event ev)
{
struct alias_device *alias;
bool new_state = false;
alias = container_of(dep, struct alias_device, dep);
switch (ev) {
case DEV_EVENT_ADD:
new_state = true;
case DEV_EVENT_REMOVE:
device_set_present(&alias->dev, new_state);
break;
case DEV_EVENT_LINK_UP:
new_state = true;
case DEV_EVENT_LINK_DOWN:
device_set_link(&alias->dev, new_state);
break;
case DEV_EVENT_UPDATE_IFINDEX:
device_set_ifindex(&alias->dev, dep->dev->ifindex);
break;
default:
device_broadcast_event(&alias->dev, ev);
break;
}
}
static struct device *
alias_device_create(const char *name, struct blob_attr *attr)
{
struct alias_device *alias;
alias = calloc(1, sizeof(*alias) + strlen(name) + 1);
if (!alias)
return NULL;
strcpy(alias->name, name);
alias->dev.set_state = alias_device_set_state;
alias->dev.hidden = true;
device_init_virtual(&alias->dev, &alias_device_type, NULL);
alias->avl.key = alias->name;
avl_insert(&aliases, &alias->avl);
alias->dep.alias = true;
alias->dep.cb = alias_device_cb;
device_check_state(&alias->dev);
return &alias->dev;
}
static void alias_device_free(struct device *dev)
{
struct alias_device *alias;
alias = container_of(dev, struct alias_device, dev);
device_remove_user(&alias->new_dep);
device_remove_user(&alias->dep);
avl_delete(&aliases, &alias->avl);
free(alias);
}
static int alias_check_state(struct device *dev)
{
struct alias_device *alias;
struct interface *iface;
struct device *ndev = NULL;
alias = container_of(dev, struct alias_device, dev);
iface = vlist_find(&interfaces, alias->name, iface, node);
if (iface && iface->state == IFS_UP)
ndev = iface->l3_dev.dev;
alias_set_device(alias, ndev);
return 0;
}
static const struct device_type alias_device_type = {
.name = "Network alias",
.create = alias_device_create,
.free = alias_device_free,
.check_state = alias_check_state,
};
void
alias_notify_device(const char *name, struct device *dev)
{
struct alias_device *alias;
device_lock();
alias = avl_find_element(&aliases, name, alias, avl);
if (alias)
alias_set_device(alias, dev);
device_unlock();
}
struct device *
device_alias_get(const char *name)
{
struct alias_device *alias;
alias = avl_find_element(&aliases, name, alias, avl);
if (alias)
return &alias->dev;
return alias_device_create(name, NULL);
}
static void __init alias_init(void)
{
avl_init(&aliases, avl_strcmp, false, NULL);
}
|
