interface: suppress unnecessary device config overrides
[project/netifd.git] / vlandev.c
1 /*
2  * netifd - network interface daemon
3  * Copyright (C) 2014 Gioacchino Mazzurco <gio@eigenlab.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
15 #include <string.h>
16
17 #include "netifd.h"
18 #include "device.h"
19 #include "interface.h"
20 #include "system.h"
21
22 enum {
23         VLANDEV_ATTR_TYPE,
24         VLANDEV_ATTR_IFNAME,
25         VLANDEV_ATTR_VID,
26         __VLANDEV_ATTR_MAX
27 };
28
29 static const struct blobmsg_policy vlandev_attrs[__VLANDEV_ATTR_MAX] = {
30         [VLANDEV_ATTR_TYPE] = { "type", BLOBMSG_TYPE_STRING },
31         [VLANDEV_ATTR_IFNAME] = { "ifname", BLOBMSG_TYPE_STRING },
32         [VLANDEV_ATTR_VID] = { "vid", BLOBMSG_TYPE_INT32 },
33 };
34
35 static const struct uci_blob_param_list vlandev_attr_list = {
36         .n_params = __VLANDEV_ATTR_MAX,
37         .params = vlandev_attrs,
38
39         .n_next = 1,
40         .next = { &device_attr_list },
41 };
42
43 struct vlandev_device {
44         struct device dev;
45         struct device_user parent;
46
47         device_state_cb set_state;
48
49         struct blob_attr *config_data;
50         struct blob_attr *ifname;
51         struct vlandev_config config;
52 };
53
54 static void
55 vlandev_base_cb(struct device_user *dev, enum device_event ev)
56 {
57         struct vlandev_device *mvdev = container_of(dev, struct vlandev_device, parent);
58
59         switch (ev) {
60         case DEV_EVENT_ADD:
61                 device_set_present(&mvdev->dev, true);
62                 break;
63         case DEV_EVENT_REMOVE:
64                 device_set_present(&mvdev->dev, false);
65                 break;
66         case DEV_EVENT_LINK_UP:
67                 device_set_link(&mvdev->dev, true);
68                 break;
69         case DEV_EVENT_LINK_DOWN:
70                 device_set_link(&mvdev->dev, false);
71                 break;
72         default:
73                 return;
74         }
75 }
76
77 static int
78 vlandev_set_down(struct vlandev_device *mvdev)
79 {
80         mvdev->set_state(&mvdev->dev, false);
81         system_vlandev_del(&mvdev->dev);
82         device_release(&mvdev->parent);
83
84         return 0;
85 }
86
87 static int
88 vlandev_set_up(struct vlandev_device *mvdev)
89 {
90         int ret;
91
92         ret = device_claim(&mvdev->parent);
93         if (ret < 0)
94                 return ret;
95
96         ret = system_vlandev_add(&mvdev->dev, mvdev->parent.dev, &mvdev->config);
97         if (ret < 0)
98                 goto release;
99
100         ret = mvdev->set_state(&mvdev->dev, true);
101         if (ret)
102                 goto delete;
103
104         return 0;
105
106 delete:
107         system_vlandev_del(&mvdev->dev);
108 release:
109         device_release(&mvdev->parent);
110         return ret;
111 }
112
113 static int
114 vlandev_set_state(struct device *dev, bool up)
115 {
116         struct vlandev_device *mvdev;
117
118         D(SYSTEM, "vlandev_set_state(%s, %u)\n", dev->ifname, up);
119
120         mvdev = container_of(dev, struct vlandev_device, dev);
121         if (up)
122                 return vlandev_set_up(mvdev);
123         else
124                 return vlandev_set_down(mvdev);
125 }
126
127 static void
128 vlandev_free(struct device *dev)
129 {
130         struct vlandev_device *mvdev;
131
132         mvdev = container_of(dev, struct vlandev_device, dev);
133         device_remove_user(&mvdev->parent);
134         free(mvdev);
135 }
136
137 static void
138 vlandev_dump_info(struct device *dev, struct blob_buf *b)
139 {
140         struct vlandev_device *mvdev;
141
142         mvdev = container_of(dev, struct vlandev_device, dev);
143         blobmsg_add_string(b, "parent", mvdev->parent.dev->ifname);
144         system_if_dump_info(dev, b);
145 }
146
147 static void
148 vlandev_config_init(struct device *dev)
149 {
150         struct vlandev_device *mvdev;
151         struct device *basedev = NULL;
152
153         mvdev = container_of(dev, struct vlandev_device, dev);
154         if (mvdev->ifname)
155                 basedev = device_get(blobmsg_data(mvdev->ifname), true);
156
157         device_add_user(&mvdev->parent, basedev);
158 }
159
160 static void
161 vlandev_apply_settings(struct vlandev_device *mvdev, struct blob_attr **tb)
162 {
163         struct vlandev_config *cfg = &mvdev->config;
164         struct blob_attr *cur;
165
166         cfg->proto = VLAN_PROTO_8021Q;
167         cfg->vid = 1;
168
169         if ((cur = tb[VLANDEV_ATTR_TYPE]))
170         {
171                 if(!strcmp(blobmsg_data(cur), "8021ad"))
172                         cfg->proto = VLAN_PROTO_8021AD;
173         }
174
175         if ((cur = tb[VLANDEV_ATTR_VID]))
176                 cfg->vid = (uint16_t) blobmsg_get_u32(cur);
177 }
178
179 static enum dev_change_type
180 vlandev_reload(struct device *dev, struct blob_attr *attr)
181 {
182         struct blob_attr *tb_dev[__DEV_ATTR_MAX];
183         struct blob_attr *tb_mv[__VLANDEV_ATTR_MAX];
184         enum dev_change_type ret = DEV_CONFIG_APPLIED;
185         struct vlandev_device *mvdev;
186
187         mvdev = container_of(dev, struct vlandev_device, dev);
188
189         blobmsg_parse(device_attr_list.params, __DEV_ATTR_MAX, tb_dev,
190                 blob_data(attr), blob_len(attr));
191         blobmsg_parse(vlandev_attrs, __VLANDEV_ATTR_MAX, tb_mv,
192                 blob_data(attr), blob_len(attr));
193
194         device_init_settings(dev, tb_dev);
195         vlandev_apply_settings(mvdev, tb_mv);
196         mvdev->ifname = tb_mv[VLANDEV_ATTR_IFNAME];
197
198         if (mvdev->config_data) {
199                 struct blob_attr *otb_dev[__DEV_ATTR_MAX];
200                 struct blob_attr *otb_mv[__VLANDEV_ATTR_MAX];
201
202                 blobmsg_parse(device_attr_list.params, __DEV_ATTR_MAX, otb_dev,
203                         blob_data(mvdev->config_data), blob_len(mvdev->config_data));
204
205                 if (uci_blob_diff(tb_dev, otb_dev, &device_attr_list, NULL))
206                     ret = DEV_CONFIG_RESTART;
207
208                 blobmsg_parse(vlandev_attrs, __VLANDEV_ATTR_MAX, otb_mv,
209                         blob_data(mvdev->config_data), blob_len(mvdev->config_data));
210
211                 if (uci_blob_diff(tb_mv, otb_mv, &vlandev_attr_list, NULL))
212                     ret = DEV_CONFIG_RESTART;
213
214                 vlandev_config_init(dev);
215         }
216
217         mvdev->config_data = attr;
218         return ret;
219 }
220
221 static struct device *
222 vlandev_create(const char *name, struct blob_attr *attr)
223 {
224         struct vlandev_device *mvdev;
225         struct device *dev = NULL;
226
227         mvdev = calloc(1, sizeof(*mvdev));
228         if (!mvdev)
229                 return NULL;
230
231         dev = &mvdev->dev;
232         device_init(dev, &vlandev_device_type, name);
233         dev->config_pending = true;
234
235         mvdev->set_state = dev->set_state;
236         dev->set_state = vlandev_set_state;
237
238         dev->hotplug_ops = NULL;
239         mvdev->parent.cb = vlandev_base_cb;
240
241         vlandev_reload(dev, attr);
242
243         return dev;
244 }
245
246 const struct device_type vlandev_device_type = {
247         .name = "VLANDEV",
248         .config_params = &vlandev_attr_list,
249         .keep_link_status = true,
250
251         .create = vlandev_create,
252         .config_init = vlandev_config_init,
253         .reload = vlandev_reload,
254         .free = vlandev_free,
255         .dump_info = vlandev_dump_info,
256 };