device.c

   1 #include <string.h>
   2 #include <stdlib.h>
   3 #include <stdio.h>
   4 #include <assert.h>
   5
   6 #include <sys/types.h>
   7 #include <sys/socket.h>
   8 #include <net/ethernet.h>
   9
  10 #ifdef linux
  11 #include <netinet/ether.h>
  12 #endif
  13
  14 #include "netifd.h"
  15 #include "system.h"
  16 #include "config.h"
  17
  18 static struct avl_tree devices;
  19
  20 static const struct blobmsg_policy dev_attrs[__DEV_ATTR_MAX] = {
  21         [DEV_ATTR_TYPE] = { "type", BLOBMSG_TYPE_STRING },
  22         [DEV_ATTR_NAME] = { "name", BLOBMSG_TYPE_STRING },
  23         [DEV_ATTR_IFNAME] = { "ifname", BLOBMSG_TYPE_ARRAY },
  24         [DEV_ATTR_MTU] = { "mtu", BLOBMSG_TYPE_INT32 },
  25         [DEV_ATTR_MACADDR] = { "macaddr", BLOBMSG_TYPE_STRING },
  26         [DEV_ATTR_TXQUEUELEN] = { "txqueuelen", BLOBMSG_TYPE_INT32 },
  27 };
  28
  29 const struct config_param_list device_attr_list = {
  30         .n_params = __DEV_ATTR_MAX,
  31         .params = dev_attrs,
  32 };
  33
  34 static struct device *
  35 simple_device_create(struct blob_attr *attr)
  36 {
  37         struct blob_attr *tb[__DEV_ATTR_MAX];
  38         struct device *dev = NULL;
  39         const char *name;
  40
  41         blobmsg_parse(dev_attrs, __DEV_ATTR_MAX, tb, blob_data(attr), blob_len(attr));
  42         if (!tb[DEV_ATTR_NAME])
  43                 return NULL;
  44
  45         name = blobmsg_data(tb[DEV_ATTR_NAME]);
  46         if (!name)
  47                 return NULL;
  48
  49         dev = device_get(name, true);
  50         if (!dev)
  51                 return NULL;
  52
  53         device_init_settings(dev, tb);
  54
  55         return dev;
  56 }
  57
  58 static void simple_device_free(struct device *dev)
  59 {
  60         device_cleanup(dev);
  61         free(dev);
  62 }
  63
  64 const struct device_type simple_device_type = {
  65         .name = "Network device",
  66         .config_params = &device_attr_list,
  67
  68         .create = simple_device_create,
  69         .check_state = system_if_check,
  70         .free = simple_device_free,
  71 };
  72
  73 void
  74 device_init_settings(struct device *dev, struct blob_attr **tb)
  75 {
  76         struct blob_attr *cur;
  77         struct ether_addr *ea;
  78
  79         dev->flags = 0;
  80
  81         if ((cur = tb[DEV_ATTR_MTU])) {
  82                 dev->mtu = blobmsg_get_u32(cur);
  83                 dev->flags |= DEV_OPT_MTU;
  84         }
  85
  86         if ((cur = tb[DEV_ATTR_TXQUEUELEN])) {
  87                 dev->txqueuelen = blobmsg_get_u32(cur);
  88                 dev->flags |= DEV_OPT_TXQUEUELEN;
  89         }
  90
  91         if ((cur = tb[DEV_ATTR_MACADDR])) {
  92                 ea = ether_aton(blob_data(cur));
  93                 if (ea) {
  94                         memcpy(dev->macaddr, ea, sizeof(dev->macaddr));
  95                         dev->flags |= DEV_OPT_MACADDR;
  96                 }
  97         }
  98 }
  99
 100 static void __init dev_init(void)
 101 {
 102         avl_init(&devices, avl_strcmp, true, NULL);
 103 }
 104
 105 static void device_broadcast_event(struct device *dev, enum device_event ev)
 106 {
 107         struct device_user *dep, *tmp;
 108
 109         list_for_each_entry_safe(dep, tmp, &dev->users, list) {
 110                 if (!dep->cb)
 111                         continue;
 112
 113                 dep->cb(dep, ev);
 114         }
 115 }
 116
 117 static int set_device_state(struct device *dev, bool state)
 118 {
 119         if (state)
 120                 system_if_up(dev);
 121         else
 122                 system_if_down(dev);
 123
 124         return 0;
 125 }
 126
 127 int device_claim(struct device_user *dep)
 128 {
 129         struct device *dev = dep->dev;
 130         int ret;
 131
 132         if (dep->claimed)
 133                 return 0;
 134
 135         dep->claimed = true;
 136         D(DEVICE, "claim device %s, new refcount: %d\n", dev->ifname, dev->active + 1);
 137         if (++dev->active != 1)
 138                 return 0;
 139
 140         device_broadcast_event(dev, DEV_EVENT_SETUP);
 141         ret = dev->set_state(dev, true);
 142         if (ret == 0)
 143                 device_broadcast_event(dev, DEV_EVENT_UP);
 144         else {
 145                 D(DEVICE, "claim device %s failed: %d\n", dev->ifname, ret);
 146                 dev->active = 0;
 147                 dep->claimed = false;
 148         }
 149
 150         return ret;
 151 }
 152
 153 void device_release(struct device_user *dep)
 154 {
 155         struct device *dev = dep->dev;
 156
 157         if (!dep->claimed)
 158                 return;
 159
 160         dep->claimed = false;
 161         dev->active--;
 162         D(DEVICE, "release device %s, new refcount: %d\n", dev->ifname, dev->active);
 163         assert(dev->active >= 0);
 164
 165         if (dev->active)
 166                 return;
 167
 168         device_broadcast_event(dev, DEV_EVENT_TEARDOWN);
 169         dev->set_state(dev, false);
 170         device_broadcast_event(dev, DEV_EVENT_DOWN);
 171 }
 172
 173 int device_check_state(struct device *dev)
 174 {
 175         if (!dev->type->check_state)
 176                 return 0;
 177
 178         return dev->type->check_state(dev);
 179 }
 180
 181 void device_init_virtual(struct device *dev, const struct device_type *type, const char *name)
 182 {
 183         assert(dev);
 184         assert(type);
 185
 186         if (name)
 187                 strncpy(dev->ifname, name, IFNAMSIZ);
 188
 189         D(DEVICE, "Initialize device '%s'\n", dev->ifname);
 190         INIT_LIST_HEAD(&dev->users);
 191         dev->type = type;
 192 }
 193
 194 int device_init(struct device *dev, const struct device_type *type, const char *ifname)
 195 {
 196         int ret;
 197
 198         device_init_virtual(dev, type, ifname);
 199
 200         if (!dev->set_state)
 201                 dev->set_state = set_device_state;
 202
 203         dev->avl.key = dev->ifname;
 204
 205         ret = avl_insert(&devices, &dev->avl);
 206         if (ret < 0)
 207                 return ret;
 208
 209         device_check_state(dev);
 210
 211         return 0;
 212 }
 213
 214 static struct device *
 215 device_create_default(const char *name)
 216 {
 217         struct device *dev;
 218
 219         D(DEVICE, "Create simple device '%s'\n", name);
 220         dev = calloc(1, sizeof(*dev));
 221         device_init(dev, &simple_device_type, name);
 222         dev->default_config = true;
 223         return dev;
 224 }
 225
 226 struct device *
 227 device_get(const char *name, bool create)
 228 {
 229         struct device *dev;
 230
 231         if (strchr(name, '.'))
 232                 return get_vlan_device_chain(name, create);
 233
 234         dev = avl_find_element(&devices, name, dev, avl);
 235         if (dev)
 236                 return dev;
 237
 238         if (!create)
 239                 return NULL;
 240
 241         return device_create_default(name);
 242 }
 243
 244 static void
 245 device_delete(struct device *dev)
 246 {
 247         if (!dev->avl.key)
 248                 return;
 249
 250         D(DEVICE, "Delete device '%s' from list\n", dev->ifname);
 251         avl_delete(&devices, &dev->avl);
 252         dev->avl.key = NULL;
 253 }
 254
 255 void device_cleanup(struct device *dev)
 256 {
 257         struct device_user *dep, *tmp;
 258
 259         D(DEVICE, "Clean up device '%s'\n", dev->ifname);
 260         list_for_each_entry_safe(dep, tmp, &dev->users, list) {
 261                 if (!dep->cb)
 262                         continue;
 263
 264                 dep->cb(dep, DEV_EVENT_REMOVE);
 265                 device_release(dep);
 266         }
 267
 268         device_delete(dev);
 269 }
 270
 271 void device_set_present(struct device *dev, bool state)
 272 {
 273         if (dev->present == state)
 274                 return;
 275
 276         D(DEVICE, "Device '%s' %s present\n", dev->ifname, state ? "is now" : "is no longer" );
 277         dev->present = state;
 278         device_broadcast_event(dev, state ? DEV_EVENT_ADD : DEV_EVENT_REMOVE);
 279 }
 280
 281 void device_add_user(struct device_user *dep, struct device *dev)
 282 {
 283         dep->dev = dev;
 284         list_add_tail(&dep->list, &dev->users);
 285         if (dep->cb && dev->present) {
 286                 dep->cb(dep, DEV_EVENT_ADD);
 287                 if (dev->active)
 288                         dep->cb(dep, DEV_EVENT_UP);
 289         }
 290 }
 291
 292 static void
 293 __device_free_unused(struct device *dev)
 294 {
 295         if (!list_empty(&dev->users) || dev->current_config)
 296                 return;
 297
 298         device_free(dev);
 299 }
 300
 301 void device_remove_user(struct device_user *dep)
 302 {
 303         struct device *dev = dep->dev;
 304
 305         if (dep->claimed)
 306                 device_release(dep);
 307
 308         list_del(&dep->list);
 309         dep->dev = NULL;
 310         __device_free_unused(dev);
 311 }
 312
 313 void
 314 device_free_unused(struct device *dev)
 315 {
 316         struct device *tmp;
 317
 318         if (dev)
 319                 return __device_free_unused(dev);
 320
 321         avl_for_each_element_safe(&devices, dev, avl, tmp)
 322                 __device_free_unused(dev);
 323 }
 324
 325 void
 326 device_init_pending(void)
 327 {
 328         struct device *dev, *tmp;
 329
 330         avl_for_each_element_safe(&devices, dev, avl, tmp) {
 331                 if (!dev->config_pending)
 332                         continue;
 333
 334                 dev->type->config_init(dev);
 335                 dev->config_pending = false;
 336         }
 337 }
 338
 339 enum dev_change_type
 340 device_reload_config(struct device *dev, struct blob_attr *attr)
 341 {
 342         struct blob_attr *tb[__DEV_ATTR_MAX], *tb1[__DEV_ATTR_MAX];
 343         const struct config_param_list *cfg = dev->type->config_params;
 344
 345         blobmsg_parse(cfg->params, cfg->n_params, tb,
 346                 blob_data(attr), blob_len(attr));
 347         if (dev->config)
 348                 blobmsg_parse(cfg->params, cfg->n_params, tb1,
 349                         blob_data(dev->config), blob_len(dev->config));
 350         else
 351                 memset(tb1, 0, sizeof(tb1));
 352
 353         if (!config_diff(tb, tb1, cfg, NULL))
 354                 return DEV_CONFIG_NO_CHANGE;
 355
 356         if (cfg == &device_attr_list) {
 357                 device_init_settings(dev, tb);
 358                 return DEV_CONFIG_APPLIED;
 359         } else
 360                 return DEV_CONFIG_RECREATE;
 361 }
 362
 363 static enum dev_change_type
 364 device_check_config(struct device *dev, const struct device_type *type,
 365                     struct blob_attr *attr)
 366 {
 367         if (type != dev->type)
 368                 return DEV_CONFIG_RECREATE;
 369
 370         if (dev->type->reload)
 371                 return dev->type->reload(dev, attr);
 372
 373         return device_reload_config(dev, attr);
 374 }
 375
 376 static void
 377 device_replace(struct device *dev, struct device *odev)
 378 {
 379         struct device_user *dep, *tmp;
 380         bool present = odev->present;
 381
 382         if (present)
 383                 device_set_present(odev, false);
 384
 385         list_for_each_entry_safe(dep, tmp, &odev->users, list) {
 386                 device_release(dep);
 387                 list_move_tail(&dep->list, &dev->users);
 388                 dep->dev = dev;
 389         }
 390         device_free(odev);
 391
 392         if (present)
 393                 device_set_present(dev, true);
 394 }
 395
 396 void
 397 device_reset_config(void)
 398 {
 399         struct device *dev;
 400
 401         avl_for_each_element(&devices, dev, avl)
 402                 dev->current_config = false;
 403 }
 404
 405 void
 406 device_reset_old(void)
 407 {
 408         struct device *dev, *tmp, *ndev;
 409
 410         avl_for_each_element_safe(&devices, dev, avl, tmp) {
 411                 if (dev->current_config || dev->default_config)
 412                         continue;
 413
 414                 if (dev->type != &simple_device_type)
 415                         continue;
 416
 417                 ndev = device_create_default(dev->ifname);
 418                 device_replace(ndev, dev);
 419         }
 420 }
 421
 422 struct device *
 423 device_create(const char *name, const struct device_type *type,
 424               struct blob_attr *config)
 425 {
 426         struct device *odev = NULL, *dev;
 427         enum dev_change_type change;
 428
 429         D(DEVICE, "Create new device '%s' (%s)\n", name, type->name);
 430         config = config_memdup(config);
 431         if (!config)
 432                 return NULL;
 433
 434         odev = device_get(name, false);
 435         if (odev) {
 436                 odev->current_config = true;
 437                 change = device_check_config(odev, type, config);
 438                 switch (change) {
 439                 case DEV_CONFIG_APPLIED:
 440                         D(DEVICE, "Device '%s': config applied\n", odev->ifname);
 441                         free(odev->config);
 442                         odev->config = config;
 443                         if (odev->present) {
 444                                 device_set_present(odev, false);
 445                                 device_set_present(odev, true);
 446                         }
 447                         return odev;
 448                 case DEV_CONFIG_NO_CHANGE:
 449                         D(DEVICE, "Device '%s': no configuration change\n", odev->ifname);
 450                         free(config);
 451                         return odev;
 452                 case DEV_CONFIG_RECREATE:
 453                         D(DEVICE, "Device '%s': recreate device\n", odev->ifname);
 454                         device_delete(odev);
 455                         break;
 456                 }
 457         }
 458
 459         dev = type->create(config);
 460         if (!dev)
 461                 return NULL;
 462
 463         dev->current_config = true;
 464         dev->config = config;
 465         if (odev)
 466                 device_replace(dev, odev);
 467
 468         if (!config_init && dev->config_pending)
 469                 type->config_init(dev);
 470
 471         return dev;
 472 }