device: Don't process link events anymore in device user specific callback handlers
[project/netifd.git] / vlan.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 "system.h"
20
21 struct vlan_device {
22         struct device dev;
23         struct device_user dep;
24
25         device_state_cb set_state;
26         int id;
27 };
28
29 static void free_vlan_if(struct device *iface)
30 {
31         struct vlan_device *vldev;
32
33         vldev = container_of(iface, struct vlan_device, dev);
34         device_remove_user(&vldev->dep);
35         device_cleanup(&vldev->dev);
36         free(vldev);
37 }
38
39 static int vlan_set_device_state(struct device *dev, bool up)
40 {
41         struct vlan_device *vldev;
42         int ret = 0;
43
44         vldev = container_of(dev, struct vlan_device, dev);
45         if (!up) {
46                 vldev->set_state(dev, false);
47                 system_vlan_del(dev);
48                 device_release(&vldev->dep);
49                 return 0;
50         }
51
52         ret = device_claim(&vldev->dep);
53         if (ret < 0)
54                 return ret;
55
56         system_vlan_add(vldev->dep.dev, vldev->id);
57         ret = vldev->set_state(dev, true);
58         if (ret)
59                 device_release(&vldev->dep);
60
61         return ret;
62 }
63
64 static void vlan_dev_set_name(struct vlan_device *vldev, struct device *dev)
65 {
66         vldev->dev.hidden = dev->hidden;
67         snprintf(vldev->dev.ifname, IFNAMSIZ, "%s.%d", dev->ifname, vldev->id);
68 }
69
70 static void vlan_dev_cb(struct device_user *dep, enum device_event ev)
71 {
72         struct vlan_device *vldev;
73         bool new_state = false;
74
75         vldev = container_of(dep, struct vlan_device, dep);
76         switch(ev) {
77         case DEV_EVENT_ADD:
78                 new_state = true;
79         case DEV_EVENT_REMOVE:
80                 device_set_present(&vldev->dev, new_state);
81                 break;
82         case DEV_EVENT_UPDATE_IFNAME:
83                 vlan_dev_set_name(vldev, dep->dev);
84                 device_broadcast_event(&vldev->dev, ev);
85                 break;
86         case DEV_EVENT_TOPO_CHANGE:
87                 /* Propagate topo changes */
88                 device_broadcast_event(&vldev->dev, DEV_EVENT_TOPO_CHANGE);
89                 break;
90         default:
91                 break;
92         }
93 }
94
95 static struct device *get_vlan_device(struct device *dev, int id, bool create)
96 {
97         static const struct device_type vlan_type = {
98                 .name = "VLAN",
99                 .config_params = &device_attr_list,
100                 .free = free_vlan_if,
101         };
102         struct vlan_device *vldev;
103         struct device_user *dep;
104
105         /* look for an existing interface before creating a new one */
106         list_for_each_entry(dep, &dev->users.list, list.list) {
107                 if (dep->cb != vlan_dev_cb)
108                         continue;
109
110                 vldev = container_of(dep, struct vlan_device, dep);
111                 if (vldev->id != id)
112                         continue;
113
114                 return &vldev->dev;
115         }
116
117         if (!create)
118                 return NULL;
119
120         D(DEVICE, "Create vlan device '%s.%d'\n", dev->ifname, id);
121
122         vldev = calloc(1, sizeof(*vldev));
123
124         vldev->id = id;
125         vlan_dev_set_name(vldev, dev);
126
127         device_init(&vldev->dev, &vlan_type, vldev->dev.ifname);
128         vldev->dev.default_config = true;
129
130         vldev->set_state = vldev->dev.set_state;
131         vldev->dev.set_state = vlan_set_device_state;
132
133         vldev->dep.cb = vlan_dev_cb;
134         device_add_user(&vldev->dep, dev);
135
136         return &vldev->dev;
137 }
138
139 static char *split_vlan(char *s)
140 {
141         s = strchr(s, '.');
142         if (!s)
143                 goto out;
144
145         *s = 0;
146         s++;
147
148 out:
149         return s;
150 }
151
152 struct device *get_vlan_device_chain(const char *ifname, bool create)
153 {
154         struct device *dev = NULL;
155         char *buf, *s, *next, *err = NULL;
156         int id;
157
158         buf = strdup(ifname);
159         if (!buf)
160                 return NULL;
161
162         s = split_vlan(buf);
163         dev = device_get(buf, create);
164         if (!dev)
165                 goto error;
166
167         do {
168                 next = split_vlan(s);
169                 id = strtoul(s, &err, 10);
170                 if (err && *err)
171                         goto error;
172
173                 dev = get_vlan_device(dev, id, create);
174                 if (!dev)
175                         goto error;
176
177                 s = next;
178                 if (!s)
179                         goto out;
180         } while (1);
181
182 error:
183         dev = NULL;
184 out:
185         free(buf);
186         return dev;
187 }