handle the interface autostart option
[project/netifd.git] / interface.c
1 #include <string.h>
2 #include <stdlib.h>
3 #include <stdio.h>
4
5 #include "netifd.h"
6 #include "device.h"
7 #include "interface.h"
8 #include "interface-ip.h"
9 #include "proto.h"
10 #include "ubus.h"
11 #include "config.h"
12
13 static LIST_HEAD(interfaces);
14
15 enum {
16         IFACE_ATTR_IFNAME,
17         IFACE_ATTR_PROTO,
18         IFACE_ATTR_AUTO,
19         IFACE_ATTR_MAX
20 };
21
22 static const union config_param_info iface_attr_info[IFACE_ATTR_MAX] = {
23         [IFACE_ATTR_IFNAME].type = BLOBMSG_TYPE_STRING,
24 };
25
26 static const struct blobmsg_policy iface_attrs[IFACE_ATTR_MAX] = {
27         [IFACE_ATTR_PROTO] = { .name = "proto", .type = BLOBMSG_TYPE_STRING },
28         [IFACE_ATTR_IFNAME] = { .name = "ifname", .type = BLOBMSG_TYPE_STRING },
29         [IFACE_ATTR_AUTO] = { .name = "auto", .type = BLOBMSG_TYPE_BOOL },
30 };
31
32 const struct config_param_list interface_attr_list = {
33         .n_params = IFACE_ATTR_MAX,
34         .params = iface_attrs,
35         .info = iface_attr_info,
36 };
37
38 static void
39 clear_interface_errors(struct interface *iface)
40 {
41         struct interface_error *error, *tmp;
42
43         list_for_each_entry_safe(error, tmp, &iface->errors, list) {
44                 list_del(&error->list);
45                 free(error);
46         }
47 }
48
49 void interface_add_error(struct interface *iface, const char *subsystem,
50                          const char *code, const char **data, int n_data)
51 {
52         struct interface_error *error;
53         int i, len = 0;
54         int *datalen = NULL;
55         char *dest;
56
57         if (n_data) {
58                 len = n_data * sizeof(char *);
59                 datalen = alloca(len);
60                 for (i = 0; i < n_data; i++) {
61                         datalen[i] = strlen(data[i]) + 1;
62                         len += datalen[i];
63                 }
64         }
65
66         error = calloc(1, sizeof(*error) + sizeof(char *) + len);
67         if (!error)
68                 return;
69
70         list_add_tail(&error->list, &iface->errors);
71         error->subsystem = subsystem;
72         error->code = code;
73
74         dest = (char *) &error->data[n_data + 1];
75         for (i = 0; i < n_data; i++) {
76                 error->data[i] = dest;
77                 memcpy(dest, data[i], datalen[i]);
78                 dest += datalen[i];
79         }
80         error->data[n_data] = NULL;
81 }
82
83 static void
84 interface_event(struct interface *iface, enum interface_event ev)
85 {
86         /* TODO */
87 }
88
89 static void
90 mark_interface_down(struct interface *iface)
91 {
92         interface_del_all_routes(iface);
93         interface_del_ctx_addr(iface, NULL);
94         device_release(&iface->main_dev);
95         iface->state = IFS_DOWN;
96 }
97
98 static int
99 __interface_set_up(struct interface *iface)
100 {
101         int ret;
102
103         if (iface->state != IFS_DOWN)
104                 return 0;
105
106         ret = device_claim(&iface->main_dev);
107         if (ret)
108                 return ret;
109
110         iface->state = IFS_SETUP;
111         ret = interface_proto_event(iface->proto, PROTO_CMD_SETUP, false);
112         if (ret) {
113                 mark_interface_down(iface);
114                 return ret;
115         }
116
117         return 0;
118
119 }
120
121 static void
122 __interface_set_down(struct interface *iface, bool force)
123 {
124         clear_interface_errors(iface);
125
126         if (iface->state == IFS_DOWN ||
127                 iface->state == IFS_TEARDOWN)
128                 return;
129
130         iface->state = IFS_TEARDOWN;
131         interface_event(iface, IFEV_DOWN);
132
133         interface_del_all_routes(iface);
134         interface_proto_event(iface->proto, PROTO_CMD_TEARDOWN, force);
135 }
136
137 static void
138 interface_cb(struct device_user *dep, enum device_event ev)
139 {
140         struct interface *iface;
141         bool new_state;
142
143         iface = container_of(dep, struct interface, main_dev);
144         switch (ev) {
145         case DEV_EVENT_ADD:
146                 new_state = true;
147                 break;
148         case DEV_EVENT_REMOVE:
149                 new_state = false;
150                 break;
151         default:
152                 return;
153         }
154
155         if (iface->active == new_state)
156                 return;
157
158         iface->active = new_state;
159
160         if (new_state) {
161                 if (iface->autostart && !config_init)
162                         interface_set_up(iface);
163         } else
164                 __interface_set_down(iface, true);
165 }
166
167 static void
168 interface_proto_cb(struct interface_proto_state *state, enum interface_proto_event ev)
169 {
170         struct interface *iface = state->iface;
171
172         switch (ev) {
173         case IFPEV_UP:
174                 if (iface->state != IFS_SETUP)
175                         return;
176
177                 iface->state = IFS_UP;
178                 interface_event(iface, IFEV_UP);
179                 break;
180         case IFPEV_DOWN:
181                 if (iface->state == IFS_DOWN)
182                         return;
183
184                 mark_interface_down(iface);
185                 break;
186         }
187 }
188
189 void interface_set_proto_state(struct interface *iface, struct interface_proto_state *state)
190 {
191         if (iface->proto) {
192                 interface_proto_event(iface->proto, PROTO_CMD_TEARDOWN, true);
193                 iface->proto->free(iface->proto);
194                 iface->proto = NULL;
195         }
196         iface->state = IFS_DOWN;
197         iface->proto = state;
198         if (!state)
199                 return;
200
201         state->proto_event = interface_proto_cb;
202         state->iface = iface;
203 }
204
205 struct interface *
206 interface_alloc(const char *name, struct blob_attr *attr)
207 {
208         struct interface *iface;
209         struct blob_attr *tb[IFACE_ATTR_MAX];
210         struct blob_attr *cur;
211         struct device *dev;
212         const char *proto_name = NULL;
213
214         iface = interface_get(name);
215         if (iface)
216                 return iface;
217
218         iface = calloc(1, sizeof(*iface));
219         iface->main_dev.cb = interface_cb;
220         iface->l3_iface = &iface->main_dev;
221         strncpy(iface->name, name, sizeof(iface->name) - 1);
222         list_add_tail(&iface->list, &interfaces);
223         INIT_LIST_HEAD(&iface->errors);
224         INIT_LIST_HEAD(&iface->address);
225         INIT_LIST_HEAD(&iface->routes);
226
227         blobmsg_parse(iface_attrs, IFACE_ATTR_MAX, tb,
228                       blob_data(attr), blob_len(attr));
229
230         if ((cur = tb[IFACE_ATTR_PROTO]))
231                 proto_name = blobmsg_data(cur);
232
233         proto_attach_interface(iface, proto_name);
234
235         if ((cur = tb[IFACE_ATTR_IFNAME])) {
236                 dev = device_get(blobmsg_data(cur), true);
237                 if (dev)
238                         device_add_user(&iface->main_dev, dev);
239         }
240
241         if ((cur = tb[IFACE_ATTR_AUTO]))
242                 iface->autostart = blobmsg_get_bool(cur);
243         else
244                 iface->autostart = true;
245
246         netifd_ubus_add_interface(iface);
247         config_set_state(&iface->config, attr);
248
249         return iface;
250 }
251
252 void
253 interface_free(struct interface *iface)
254 {
255         netifd_ubus_remove_interface(iface);
256         list_del(&iface->list);
257         if (iface->proto->free)
258                 iface->proto->free(iface->proto);
259         free(iface);
260 }
261
262 struct interface *
263 interface_get(const char *name)
264 {
265         struct interface *iface;
266
267         list_for_each_entry(iface, &interfaces, list) {
268                 if (!strcmp(iface->name, name))
269                         return iface;
270         }
271         return NULL;
272 }
273
274 void
275 interface_remove_link(struct interface *iface, struct device *dev)
276 {
277         struct device *mdev = iface->main_dev.dev;
278
279         if (mdev && mdev->hotplug_ops) {
280                 mdev->hotplug_ops->del(mdev, dev);
281                 return;
282         }
283
284         device_remove_user(&iface->main_dev);
285 }
286
287 int
288 interface_add_link(struct interface *iface, struct device *dev)
289 {
290         struct device *mdev = iface->main_dev.dev;
291
292         if (mdev && mdev->hotplug_ops)
293                 return mdev->hotplug_ops->add(mdev, dev);
294
295         if (iface->main_dev.dev)
296                 interface_remove_link(iface, NULL);
297
298         device_add_user(&iface->main_dev, dev);
299
300         return 0;
301 }
302
303 int
304 interface_set_up(struct interface *iface)
305 {
306         iface->autostart = true;
307
308         if (!iface->active) {
309                 interface_add_error(iface, "interface", "NO_DEVICE", NULL, 0);
310                 return -1;
311         }
312
313         if (iface->state != IFS_DOWN)
314                 return 0;
315
316         return __interface_set_up(iface);
317 }
318
319 int
320 interface_set_down(struct interface *iface)
321 {
322         iface->autostart = false;
323         __interface_set_down(iface, false);
324
325         return 0;
326 }
327
328 void
329 interface_start_pending(void)
330 {
331         struct interface *iface;
332
333         list_for_each_entry(iface, &interfaces, list) {
334                 if (iface->active && iface->autostart)
335                         interface_set_up(iface);
336         }
337 }